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apache / nifi-fds / gh-pages / . / node_modules / @angular / cdk / fesm2015 / drag-drop.js
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import { ɵɵdefineInjectable, ɵɵinject, NgZone, Injectable, Inject, InjectionToken, Directive, Input, EventEmitter, ElementRef, ChangeDetectorRef, Optional, SkipSelf, Output, TemplateRef, ViewContainerRef, Self, ContentChildren, ContentChild, NgModule } from '@angular/core';
import { DOCUMENT } from '@angular/common';
import { ViewportRuler, ScrollDispatcher, CdkScrollableModule } from '@angular/cdk/scrolling';
import { normalizePassiveListenerOptions, _getShadowRoot } from '@angular/cdk/platform';
import { coerceBooleanProperty, coerceElement, coerceArray, coerceNumberProperty } from '@angular/cdk/coercion';
import { Subject, Subscription, interval, animationFrameScheduler, Observable, merge } from 'rxjs';
import { takeUntil, startWith, map, take, tap, switchMap } from 'rxjs/operators';
import { Directionality } from '@angular/cdk/bidi';
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
/**
* Shallow-extends a stylesheet object with another stylesheet object.
* @docs-private
*/
function extendStyles(dest, source) {
for (let key in source) {
if (source.hasOwnProperty(key)) {
dest[key] = source[key];
}
}
return dest;
}
/**
* Toggles whether the native drag interactions should be enabled for an element.
* @param element Element on which to toggle the drag interactions.
* @param enable Whether the drag interactions should be enabled.
* @docs-private
*/
function toggleNativeDragInteractions(element, enable) {
const userSelect = enable ? '' : 'none';
extendStyles(element.style, {
touchAction: enable ? '' : 'none',
webkitUserDrag: enable ? '' : 'none',
webkitTapHighlightColor: enable ? '' : 'transparent',
userSelect: userSelect,
msUserSelect: userSelect,
webkitUserSelect: userSelect,
MozUserSelect: userSelect
});
}
/**
* Toggles whether an element is visible while preserving its dimensions.
* @param element Element whose visibility to toggle
* @param enable Whether the element should be visible.
* @docs-private
*/
function toggleVisibility(element, enable) {
const styles = element.style;
styles.position = enable ? '' : 'fixed';
styles.top = styles.opacity = enable ? '' : '0';
styles.left = enable ? '' : '-999em';
}
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
/** Parses a CSS time value to milliseconds. */
function parseCssTimeUnitsToMs(value) {
// Some browsers will return it in seconds, whereas others will return milliseconds.
const multiplier = value.toLowerCase().indexOf('ms') > -1 ? 1 : 1000;
return parseFloat(value) * multiplier;
}
/** Gets the transform transition duration, including the delay, of an element in milliseconds. */
function getTransformTransitionDurationInMs(element) {
const computedStyle = getComputedStyle(element);
const transitionedProperties = parseCssPropertyValue(computedStyle, 'transition-property');
const property = transitionedProperties.find(prop => prop === 'transform' || prop === 'all');
// If there's no transition for `all` or `transform`, we shouldn't do anything.
if (!property) {
return 0;
}
// Get the index of the property that we're interested in and match
// it up to the same index in `transition-delay` and `transition-duration`.
const propertyIndex = transitionedProperties.indexOf(property);
const rawDurations = parseCssPropertyValue(computedStyle, 'transition-duration');
const rawDelays = parseCssPropertyValue(computedStyle, 'transition-delay');
return parseCssTimeUnitsToMs(rawDurations[propertyIndex]) +
parseCssTimeUnitsToMs(rawDelays[propertyIndex]);
}
/** Parses out multiple values from a computed style into an array. */
function parseCssPropertyValue(computedStyle, name) {
const value = computedStyle.getPropertyValue(name);
return value.split(',').map(part => part.trim());
}
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
/** Gets a mutable version of an element's bounding `ClientRect`. */
function getMutableClientRect(element) {
const clientRect = element.getBoundingClientRect();
// We need to clone the `clientRect` here, because all the values on it are readonly
// and we need to be able to update them. Also we can't use a spread here, because
// the values on a `ClientRect` aren't own properties. See:
// https://developer.mozilla.org/en-US/docs/Web/API/Element/getBoundingClientRect#Notes
return {
top: clientRect.top,
right: clientRect.right,
bottom: clientRect.bottom,
left: clientRect.left,
width: clientRect.width,
height: clientRect.height
};
}
/**
* Checks whether some coordinates are within a `ClientRect`.
* @param clientRect ClientRect that is being checked.
* @param x Coordinates along the X axis.
* @param y Coordinates along the Y axis.
*/
function isInsideClientRect(clientRect, x, y) {
const { top, bottom, left, right } = clientRect;
return y >= top && y <= bottom && x >= left && x <= right;
}
/**
* Updates the top/left positions of a `ClientRect`, as well as their bottom/right counterparts.
* @param clientRect `ClientRect` that should be updated.
* @param top Amount to add to the `top` position.
* @param left Amount to add to the `left` position.
*/
function adjustClientRect(clientRect, top, left) {
clientRect.top += top;
clientRect.bottom = clientRect.top + clientRect.height;
clientRect.left += left;
clientRect.right = clientRect.left + clientRect.width;
}
/**
* Checks whether the pointer coordinates are close to a ClientRect.
* @param rect ClientRect to check against.
* @param threshold Threshold around the ClientRect.
* @param pointerX Coordinates along the X axis.
* @param pointerY Coordinates along the Y axis.
*/
function isPointerNearClientRect(rect, threshold, pointerX, pointerY) {
const { top, right, bottom, left, width, height } = rect;
const xThreshold = width * threshold;
const yThreshold = height * threshold;
return pointerY > top - yThreshold && pointerY < bottom + yThreshold &&
pointerX > left - xThreshold && pointerX < right + xThreshold;
}
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
/** Keeps track of the scroll position and dimensions of the parents of an element. */
class ParentPositionTracker {
constructor(_document, _viewportRuler) {
this._document = _document;
this._viewportRuler = _viewportRuler;
/** Cached positions of the scrollable parent elements. */
this.positions = new Map();
}
/** Clears the cached positions. */
clear() {
this.positions.clear();
}
/** Caches the positions. Should be called at the beginning of a drag sequence. */
cache(elements) {
this.clear();
this.positions.set(this._document, {
scrollPosition: this._viewportRuler.getViewportScrollPosition(),
});
elements.forEach(element => {
this.positions.set(element, {
scrollPosition: { top: element.scrollTop, left: element.scrollLeft },
clientRect: getMutableClientRect(element)
});
});
}
/** Handles scrolling while a drag is taking place. */
handleScroll(event) {
const target = event.target;
const cachedPosition = this.positions.get(target);
if (!cachedPosition) {
return null;
}
// Used when figuring out whether an element is inside the scroll parent. If the scrolled
// parent is the `document`, we use the `documentElement`, because IE doesn't support
// `contains` on the `document`.
const scrolledParentNode = target === this._document ? target.documentElement : target;
const scrollPosition = cachedPosition.scrollPosition;
let newTop;
let newLeft;
if (target === this._document) {
const viewportScrollPosition = this._viewportRuler.getViewportScrollPosition();
newTop = viewportScrollPosition.top;
newLeft = viewportScrollPosition.left;
}
else {
newTop = target.scrollTop;
newLeft = target.scrollLeft;
}
const topDifference = scrollPosition.top - newTop;
const leftDifference = scrollPosition.left - newLeft;
// Go through and update the cached positions of the scroll
// parents that are inside the element that was scrolled.
this.positions.forEach((position, node) => {
if (position.clientRect && target !== node && scrolledParentNode.contains(node)) {
adjustClientRect(position.clientRect, topDifference, leftDifference);
}
});
scrollPosition.top = newTop;
scrollPosition.left = newLeft;
return { top: topDifference, left: leftDifference };
}
}
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
/** Creates a deep clone of an element. */
function deepCloneNode(node) {
const clone = node.cloneNode(true);
const descendantsWithId = clone.querySelectorAll('[id]');
const nodeName = node.nodeName.toLowerCase();
// Remove the `id` to avoid having multiple elements with the same id on the page.
clone.removeAttribute('id');
for (let i = 0; i < descendantsWithId.length; i++) {
descendantsWithId[i].removeAttribute('id');
}
if (nodeName === 'canvas') {
transferCanvasData(node, clone);
}
else if (nodeName === 'input' || nodeName === 'select' || nodeName === 'textarea') {
transferInputData(node, clone);
}
transferData('canvas', node, clone, transferCanvasData);
transferData('input, textarea, select', node, clone, transferInputData);
return clone;
}
/** Matches elements between an element and its clone and allows for their data to be cloned. */
function transferData(selector, node, clone, callback) {
const descendantElements = node.querySelectorAll(selector);
if (descendantElements.length) {
const cloneElements = clone.querySelectorAll(selector);
for (let i = 0; i < descendantElements.length; i++) {
callback(descendantElements[i], cloneElements[i]);
}
}
}
// Counter for unique cloned radio button names.
let cloneUniqueId = 0;
/** Transfers the data of one input element to another. */
function transferInputData(source, clone) {
// Browsers throw an error when assigning the value of a file input programmatically.
if (clone.type !== 'file') {
clone.value = source.value;
}
// Radio button `name` attributes must be unique for radio button groups
// otherwise original radio buttons can lose their checked state
// once the clone is inserted in the DOM.
if (clone.type === 'radio' && clone.name) {
clone.name = `mat-clone-${clone.name}-${cloneUniqueId++}`;
}
}
/** Transfers the data of one canvas element to another. */
function transferCanvasData(source, clone) {
const context = clone.getContext('2d');
if (context) {
// In some cases `drawImage` can throw (e.g. if the canvas size is 0x0).
// We can't do much about it so just ignore the error.
try {
context.drawImage(source, 0, 0);
}
catch (_a) { }
}
}
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
/** Options that can be used to bind a passive event listener. */
const passiveEventListenerOptions = normalizePassiveListenerOptions({ passive: true });
/** Options that can be used to bind an active event listener. */
const activeEventListenerOptions = normalizePassiveListenerOptions({ passive: false });
/**
* Time in milliseconds for which to ignore mouse events, after
* receiving a touch event. Used to avoid doing double work for
* touch devices where the browser fires fake mouse events, in
* addition to touch events.
*/
const MOUSE_EVENT_IGNORE_TIME = 800;
/**
* Reference to a draggable item. Used to manipulate or dispose of the item.
*/
class DragRef {
constructor(element, _config, _document, _ngZone, _viewportRuler, _dragDropRegistry) {
this._config = _config;
this._document = _document;
this._ngZone = _ngZone;
this._viewportRuler = _viewportRuler;
this._dragDropRegistry = _dragDropRegistry;
/**
* CSS `transform` applied to the element when it isn't being dragged. We need a
* passive transform in order for the dragged element to retain its new position
* after the user has stopped dragging and because we need to know the relative
* position in case they start dragging again. This corresponds to `element.style.transform`.
*/
this._passiveTransform = { x: 0, y: 0 };
/** CSS `transform` that is applied to the element while it's being dragged. */
this._activeTransform = { x: 0, y: 0 };
/** Emits when the item is being moved. */
this._moveEvents = new Subject();
/** Subscription to pointer movement events. */
this._pointerMoveSubscription = Subscription.EMPTY;
/** Subscription to the event that is dispatched when the user lifts their pointer. */
this._pointerUpSubscription = Subscription.EMPTY;
/** Subscription to the viewport being scrolled. */
this._scrollSubscription = Subscription.EMPTY;
/** Subscription to the viewport being resized. */
this._resizeSubscription = Subscription.EMPTY;
/** Cached reference to the boundary element. */
this._boundaryElement = null;
/** Whether the native dragging interactions have been enabled on the root element. */
this._nativeInteractionsEnabled = true;
/** Elements that can be used to drag the draggable item. */
this._handles = [];
/** Registered handles that are currently disabled. */
this._disabledHandles = new Set();
/** Layout direction of the item. */
this._direction = 'ltr';
/**
* Amount of milliseconds to wait after the user has put their
* pointer down before starting to drag the element.
*/
this.dragStartDelay = 0;
this._disabled = false;
/** Emits as the drag sequence is being prepared. */
this.beforeStarted = new Subject();
/** Emits when the user starts dragging the item. */
this.started = new Subject();
/** Emits when the user has released a drag item, before any animations have started. */
this.released = new Subject();
/** Emits when the user stops dragging an item in the container. */
this.ended = new Subject();
/** Emits when the user has moved the item into a new container. */
this.entered = new Subject();
/** Emits when the user removes the item its container by dragging it into another container. */
this.exited = new Subject();
/** Emits when the user drops the item inside a container. */
this.dropped = new Subject();
/**
* Emits as the user is dragging the item. Use with caution,
* because this event will fire for every pixel that the user has dragged.
*/
this.moved = this._moveEvents;
/** Handler for the `mousedown`/`touchstart` events. */
this._pointerDown = (event) => {
this.beforeStarted.next();
// Delegate the event based on whether it started from a handle or the element itself.
if (this._handles.length) {
const targetHandle = this._handles.find(handle => {
const target = event.target;
return !!target && (target === handle || handle.contains(target));
});
if (targetHandle && !this._disabledHandles.has(targetHandle) && !this.disabled) {
this._initializeDragSequence(targetHandle, event);
}
}
else if (!this.disabled) {
this._initializeDragSequence(this._rootElement, event);
}
};
/** Handler that is invoked when the user moves their pointer after they've initiated a drag. */
this._pointerMove = (event) => {
const pointerPosition = this._getPointerPositionOnPage(event);
if (!this._hasStartedDragging) {
const distanceX = Math.abs(pointerPosition.x - this._pickupPositionOnPage.x);
const distanceY = Math.abs(pointerPosition.y - this._pickupPositionOnPage.y);
const isOverThreshold = distanceX + distanceY >= this._config.dragStartThreshold;
// Only start dragging after the user has moved more than the minimum distance in either
// direction. Note that this is preferrable over doing something like `skip(minimumDistance)`
// in the `pointerMove` subscription, because we're not guaranteed to have one move event
// per pixel of movement (e.g. if the user moves their pointer quickly).
if (isOverThreshold) {
const isDelayElapsed = Date.now() >= this._dragStartTime + this._getDragStartDelay(event);
const container = this._dropContainer;
if (!isDelayElapsed) {
this._endDragSequence(event);
return;
}
// Prevent other drag sequences from starting while something in the container is still
// being dragged. This can happen while we're waiting for the drop animation to finish
// and can cause errors, because some elements might still be moving around.
if (!container || (!container.isDragging() && !container.isReceiving())) {
// Prevent the default action as soon as the dragging sequence is considered as
// "started" since waiting for the next event can allow the device to begin scrolling.
event.preventDefault();
this._hasStartedDragging = true;
this._ngZone.run(() => this._startDragSequence(event));
}
}
return;
}
// We only need the preview dimensions if we have a boundary element.
if (this._boundaryElement) {
// Cache the preview element rect if we haven't cached it already or if
// we cached it too early before the element dimensions were computed.
if (!this._previewRect || (!this._previewRect.width && !this._previewRect.height)) {
this._previewRect = (this._preview || this._rootElement).getBoundingClientRect();
}
}
// We prevent the default action down here so that we know that dragging has started. This is
// important for touch devices where doing this too early can unnecessarily block scrolling,
// if there's a dragging delay.
event.preventDefault();
const constrainedPointerPosition = this._getConstrainedPointerPosition(pointerPosition);
this._hasMoved = true;
this._lastKnownPointerPosition = pointerPosition;
this._updatePointerDirectionDelta(constrainedPointerPosition);
if (this._dropContainer) {
this._updateActiveDropContainer(constrainedPointerPosition, pointerPosition);
}
else {
const activeTransform = this._activeTransform;
activeTransform.x =
constrainedPointerPosition.x - this._pickupPositionOnPage.x + this._passiveTransform.x;
activeTransform.y =
constrainedPointerPosition.y - this._pickupPositionOnPage.y + this._passiveTransform.y;
this._applyRootElementTransform(activeTransform.x, activeTransform.y);
// Apply transform as attribute if dragging and svg element to work for IE
if (typeof SVGElement !== 'undefined' && this._rootElement instanceof SVGElement) {
const appliedTransform = `translate(${activeTransform.x} ${activeTransform.y})`;
this._rootElement.setAttribute('transform', appliedTransform);
}
}
// Since this event gets fired for every pixel while dragging, we only
// want to fire it if the consumer opted into it. Also we have to
// re-enter the zone because we run all of the events on the outside.
if (this._moveEvents.observers.length) {
this._ngZone.run(() => {
this._moveEvents.next({
source: this,
pointerPosition: constrainedPointerPosition,
event,
distance: this._getDragDistance(constrainedPointerPosition),
delta: this._pointerDirectionDelta
});
});
}
};
/** Handler that is invoked when the user lifts their pointer up, after initiating a drag. */
this._pointerUp = (event) => {
this._endDragSequence(event);
};
this.withRootElement(element).withParent(_config.parentDragRef || null);
this._parentPositions = new ParentPositionTracker(_document, _viewportRuler);
_dragDropRegistry.registerDragItem(this);
}
/** Whether starting to drag this element is disabled. */
get disabled() {
return this._disabled || !!(this._dropContainer && this._dropContainer.disabled);
}
set disabled(value) {
const newValue = coerceBooleanProperty(value);
if (newValue !== this._disabled) {
this._disabled = newValue;
this._toggleNativeDragInteractions();
this._handles.forEach(handle => toggleNativeDragInteractions(handle, newValue));
}
}
/**
* Returns the element that is being used as a placeholder
* while the current element is being dragged.
*/
getPlaceholderElement() {
return this._placeholder;
}
/** Returns the root draggable element. */
getRootElement() {
return this._rootElement;
}
/**
* Gets the currently-visible element that represents the drag item.
* While dragging this is the placeholder, otherwise it's the root element.
*/
getVisibleElement() {
return this.isDragging() ? this.getPlaceholderElement() : this.getRootElement();
}
/** Registers the handles that can be used to drag the element. */
withHandles(handles) {
this._handles = handles.map(handle => coerceElement(handle));
this._handles.forEach(handle => toggleNativeDragInteractions(handle, this.disabled));
this._toggleNativeDragInteractions();
// Delete any lingering disabled handles that may have been destroyed. Note that we re-create
// the set, rather than iterate over it and filter out the destroyed handles, because while
// the ES spec allows for sets to be modified while they're being iterated over, some polyfills
// use an array internally which may throw an error.
const disabledHandles = new Set();
this._disabledHandles.forEach(handle => {
if (this._handles.indexOf(handle) > -1) {
disabledHandles.add(handle);
}
});
this._disabledHandles = disabledHandles;
return this;
}
/**
* Registers the template that should be used for the drag preview.
* @param template Template that from which to stamp out the preview.
*/
withPreviewTemplate(template) {
this._previewTemplate = template;
return this;
}
/**
* Registers the template that should be used for the drag placeholder.
* @param template Template that from which to stamp out the placeholder.
*/
withPlaceholderTemplate(template) {
this._placeholderTemplate = template;
return this;
}
/**
* Sets an alternate drag root element. The root element is the element that will be moved as
* the user is dragging. Passing an alternate root element is useful when trying to enable
* dragging on an element that you might not have access to.
*/
withRootElement(rootElement) {
const element = coerceElement(rootElement);
if (element !== this._rootElement) {
if (this._rootElement) {
this._removeRootElementListeners(this._rootElement);
}
this._ngZone.runOutsideAngular(() => {
element.addEventListener('mousedown', this._pointerDown, activeEventListenerOptions);
element.addEventListener('touchstart', this._pointerDown, passiveEventListenerOptions);
});
this._initialTransform = undefined;
this._rootElement = element;
}
if (typeof SVGElement !== 'undefined' && this._rootElement instanceof SVGElement) {
this._ownerSVGElement = this._rootElement.ownerSVGElement;
}
return this;
}
/**
* Element to which the draggable's position will be constrained.
*/
withBoundaryElement(boundaryElement) {
this._boundaryElement = boundaryElement ? coerceElement(boundaryElement) : null;
this._resizeSubscription.unsubscribe();
if (boundaryElement) {
this._resizeSubscription = this._viewportRuler
.change(10)
.subscribe(() => this._containInsideBoundaryOnResize());
}
return this;
}
/** Sets the parent ref that the ref is nested in. */
withParent(parent) {
this._parentDragRef = parent;
return this;
}
/** Removes the dragging functionality from the DOM element. */
dispose() {
this._removeRootElementListeners(this._rootElement);
// Do this check before removing from the registry since it'll
// stop being considered as dragged once it is removed.
if (this.isDragging()) {
// Since we move out the element to the end of the body while it's being
// dragged, we have to make sure that it's removed if it gets destroyed.
removeNode(this._rootElement);
}
removeNode(this._anchor);
this._destroyPreview();
this._destroyPlaceholder();
this._dragDropRegistry.removeDragItem(this);
this._removeSubscriptions();
this.beforeStarted.complete();
this.started.complete();
this.released.complete();
this.ended.complete();
this.entered.complete();
this.exited.complete();
this.dropped.complete();
this._moveEvents.complete();
this._handles = [];
this._disabledHandles.clear();
this._dropContainer = undefined;
this._resizeSubscription.unsubscribe();
this._parentPositions.clear();
this._boundaryElement = this._rootElement = this._ownerSVGElement = this._placeholderTemplate =
this._previewTemplate = this._anchor = this._parentDragRef = null;
}
/** Checks whether the element is currently being dragged. */
isDragging() {
return this._hasStartedDragging && this._dragDropRegistry.isDragging(this);
}
/** Resets a standalone drag item to its initial position. */
reset() {
this._rootElement.style.transform = this._initialTransform || '';
this._activeTransform = { x: 0, y: 0 };
this._passiveTransform = { x: 0, y: 0 };
}
/**
* Sets a handle as disabled. While a handle is disabled, it'll capture and interrupt dragging.
* @param handle Handle element that should be disabled.
*/
disableHandle(handle) {
if (!this._disabledHandles.has(handle) && this._handles.indexOf(handle) > -1) {
this._disabledHandles.add(handle);
toggleNativeDragInteractions(handle, true);
}
}
/**
* Enables a handle, if it has been disabled.
* @param handle Handle element to be enabled.
*/
enableHandle(handle) {
if (this._disabledHandles.has(handle)) {
this._disabledHandles.delete(handle);
toggleNativeDragInteractions(handle, this.disabled);
}
}
/** Sets the layout direction of the draggable item. */
withDirection(direction) {
this._direction = direction;
return this;
}
/** Sets the container that the item is part of. */
_withDropContainer(container) {
this._dropContainer = container;
}
/**
* Gets the current position in pixels the draggable outside of a drop container.
*/
getFreeDragPosition() {
const position = this.isDragging() ? this._activeTransform : this._passiveTransform;
return { x: position.x, y: position.y };
}
/**
* Sets the current position in pixels the draggable outside of a drop container.
* @param value New position to be set.
*/
setFreeDragPosition(value) {
this._activeTransform = { x: 0, y: 0 };
this._passiveTransform.x = value.x;
this._passiveTransform.y = value.y;
if (!this._dropContainer) {
this._applyRootElementTransform(value.x, value.y);
}
return this;
}
/** Updates the item's sort order based on the last-known pointer position. */
_sortFromLastPointerPosition() {
const position = this._lastKnownPointerPosition;
if (position && this._dropContainer) {
this._updateActiveDropContainer(this._getConstrainedPointerPosition(position), position);
}
}
/** Unsubscribes from the global subscriptions. */
_removeSubscriptions() {
this._pointerMoveSubscription.unsubscribe();
this._pointerUpSubscription.unsubscribe();
this._scrollSubscription.unsubscribe();
}
/** Destroys the preview element and its ViewRef. */
_destroyPreview() {
if (this._preview) {
removeNode(this._preview);
}
if (this._previewRef) {
this._previewRef.destroy();
}
this._preview = this._previewRef = null;
}
/** Destroys the placeholder element and its ViewRef. */
_destroyPlaceholder() {
if (this._placeholder) {
removeNode(this._placeholder);
}
if (this._placeholderRef) {
this._placeholderRef.destroy();
}
this._placeholder = this._placeholderRef = null;
}
/**
* Clears subscriptions and stops the dragging sequence.
* @param event Browser event object that ended the sequence.
*/
_endDragSequence(event) {
// Note that here we use `isDragging` from the service, rather than from `this`.
// The difference is that the one from the service reflects whether a dragging sequence
// has been initiated, whereas the one on `this` includes whether the user has passed
// the minimum dragging threshold.
if (!this._dragDropRegistry.isDragging(this)) {
return;
}
this._removeSubscriptions();
this._dragDropRegistry.stopDragging(this);
this._toggleNativeDragInteractions();
if (this._handles) {
this._rootElement.style.webkitTapHighlightColor = this._rootElementTapHighlight;
}
if (!this._hasStartedDragging) {
return;
}
this.released.next({ source: this });
if (this._dropContainer) {
// Stop scrolling immediately, instead of waiting for the animation to finish.
this._dropContainer._stopScrolling();
this._animatePreviewToPlaceholder().then(() => {
this._cleanupDragArtifacts(event);
this._cleanupCachedDimensions();
this._dragDropRegistry.stopDragging(this);
});
}
else {
// Convert the active transform into a passive one. This means that next time
// the user starts dragging the item, its position will be calculated relatively
// to the new passive transform.
this._passiveTransform.x = this._activeTransform.x;
this._passiveTransform.y = this._activeTransform.y;
this._ngZone.run(() => {
this.ended.next({
source: this,
distance: this._getDragDistance(this._getPointerPositionOnPage(event))
});
});
this._cleanupCachedDimensions();
this._dragDropRegistry.stopDragging(this);
}
}
/** Starts the dragging sequence. */
_startDragSequence(event) {
if (isTouchEvent(event)) {
this._lastTouchEventTime = Date.now();
}
this._toggleNativeDragInteractions();
const dropContainer = this._dropContainer;
if (dropContainer) {
const element = this._rootElement;
const parent = element.parentNode;
const preview = this._preview = this._createPreviewElement();
const placeholder = this._placeholder = this._createPlaceholderElement();
const anchor = this._anchor = this._anchor || this._document.createComment('');
// Needs to happen before the root element is moved.
const shadowRoot = this._getShadowRoot();
// Insert an anchor node so that we can restore the element's position in the DOM.
parent.insertBefore(anchor, element);
// We move the element out at the end of the body and we make it hidden, because keeping it in
// place will throw off the consumer's `:last-child` selectors. We can't remove the element
// from the DOM completely, because iOS will stop firing all subsequent events in the chain.
toggleVisibility(element, false);
this._document.body.appendChild(parent.replaceChild(placeholder, element));
getPreviewInsertionPoint(this._document, shadowRoot).appendChild(preview);
this.started.next({ source: this }); // Emit before notifying the container.
dropContainer.start();
this._initialContainer = dropContainer;
this._initialIndex = dropContainer.getItemIndex(this);
}
else {
this.started.next({ source: this });
this._initialContainer = this._initialIndex = undefined;
}
// Important to run after we've called `start` on the parent container
// so that it has had time to resolve its scrollable parents.
this._parentPositions.cache(dropContainer ? dropContainer.getScrollableParents() : []);
}
/**
* Sets up the different variables and subscriptions
* that will be necessary for the dragging sequence.
* @param referenceElement Element that started the drag sequence.
* @param event Browser event object that started the sequence.
*/
_initializeDragSequence(referenceElement, event) {
// Stop propagation if the item is inside another
// draggable so we don't start multiple drag sequences.
if (this._parentDragRef) {
event.stopPropagation();
}
const isDragging = this.isDragging();
const isTouchSequence = isTouchEvent(event);
const isAuxiliaryMouseButton = !isTouchSequence && event.button !== 0;
const rootElement = this._rootElement;
const isSyntheticEvent = !isTouchSequence && this._lastTouchEventTime &&
this._lastTouchEventTime + MOUSE_EVENT_IGNORE_TIME > Date.now();
// If the event started from an element with the native HTML drag&drop, it'll interfere
// with our own dragging (e.g. `img` tags do it by default). Prevent the default action
// to stop it from happening. Note that preventing on `dragstart` also seems to work, but
// it's flaky and it fails if the user drags it away quickly. Also note that we only want
// to do this for `mousedown` since doing the same for `touchstart` will stop any `click`
// events from firing on touch devices.
if (event.target && event.target.draggable && event.type === 'mousedown') {
event.preventDefault();
}
// Abort if the user is already dragging or is using a mouse button other than the primary one.
if (isDragging || isAuxiliaryMouseButton || isSyntheticEvent) {
return;
}
// If we've got handles, we need to disable the tap highlight on the entire root element,
// otherwise iOS will still add it, even though all the drag interactions on the handle
// are disabled.
if (this._handles.length) {
this._rootElementTapHighlight = rootElement.style.webkitTapHighlightColor || '';
rootElement.style.webkitTapHighlightColor = 'transparent';
}
this._hasStartedDragging = this._hasMoved = false;
// Avoid multiple subscriptions and memory leaks when multi touch
// (isDragging check above isn't enough because of possible temporal and/or dimensional delays)
this._removeSubscriptions();
this._pointerMoveSubscription = this._dragDropRegistry.pointerMove.subscribe(this._pointerMove);
this._pointerUpSubscription = this._dragDropRegistry.pointerUp.subscribe(this._pointerUp);
this._scrollSubscription = this._dragDropRegistry.scroll.subscribe(scrollEvent => {
this._updateOnScroll(scrollEvent);
});
if (this._boundaryElement) {
this._boundaryRect = getMutableClientRect(this._boundaryElement);
}
// If we have a custom preview we can't know ahead of time how large it'll be so we position
// it next to the cursor. The exception is when the consumer has opted into making the preview
// the same size as the root element, in which case we do know the size.
const previewTemplate = this._previewTemplate;
this._pickupPositionInElement = previewTemplate && previewTemplate.template &&
!previewTemplate.matchSize ? { x: 0, y: 0 } :
this._getPointerPositionInElement(referenceElement, event);
const pointerPosition = this._pickupPositionOnPage = this._lastKnownPointerPosition =
this._getPointerPositionOnPage(event);
this._pointerDirectionDelta = { x: 0, y: 0 };
this._pointerPositionAtLastDirectionChange = { x: pointerPosition.x, y: pointerPosition.y };
this._dragStartTime = Date.now();
this._dragDropRegistry.startDragging(this, event);
}
/** Cleans up the DOM artifacts that were added to facilitate the element being dragged. */
_cleanupDragArtifacts(event) {
// Restore the element's visibility and insert it at its old position in the DOM.
// It's important that we maintain the position, because moving the element around in the DOM
// can throw off `NgFor` which does smart diffing and re-creates elements only when necessary,
// while moving the existing elements in all other cases.
toggleVisibility(this._rootElement, true);
this._anchor.parentNode.replaceChild(this._rootElement, this._anchor);
this._destroyPreview();
this._destroyPlaceholder();
this._boundaryRect = this._previewRect = undefined;
// Re-enter the NgZone since we bound `document` events on the outside.
this._ngZone.run(() => {
const container = this._dropContainer;
const currentIndex = container.getItemIndex(this);
const pointerPosition = this._getPointerPositionOnPage(event);
const distance = this._getDragDistance(this._getPointerPositionOnPage(event));
const isPointerOverContainer = container._isOverContainer(pointerPosition.x, pointerPosition.y);
this.ended.next({ source: this, distance });
this.dropped.next({
item: this,
currentIndex,
previousIndex: this._initialIndex,
container: container,
previousContainer: this._initialContainer,
isPointerOverContainer,
distance
});
container.drop(this, currentIndex, this._initialIndex, this._initialContainer, isPointerOverContainer, distance);
this._dropContainer = this._initialContainer;
});
}
/**
* Updates the item's position in its drop container, or moves it
* into a new one, depending on its current drag position.
*/
_updateActiveDropContainer({ x, y }, { x: rawX, y: rawY }) {
// Drop container that draggable has been moved into.
let newContainer = this._initialContainer._getSiblingContainerFromPosition(this, x, y);
// If we couldn't find a new container to move the item into, and the item has left its
// initial container, check whether the it's over the initial container. This handles the
// case where two containers are connected one way and the user tries to undo dragging an
// item into a new container.
if (!newContainer && this._dropContainer !== this._initialContainer &&
this._initialContainer._isOverContainer(x, y)) {
newContainer = this._initialContainer;
}
if (newContainer && newContainer !== this._dropContainer) {
this._ngZone.run(() => {
// Notify the old container that the item has left.
this.exited.next({ item: this, container: this._dropContainer });
this._dropContainer.exit(this);
// Notify the new container that the item has entered.
this._dropContainer = newContainer;
this._dropContainer.enter(this, x, y, newContainer === this._initialContainer &&
// If we're re-entering the initial container and sorting is disabled,
// put item the into its starting index to begin with.
newContainer.sortingDisabled ? this._initialIndex : undefined);
this.entered.next({
item: this,
container: newContainer,
currentIndex: newContainer.getItemIndex(this)
});
});
}
this._dropContainer._startScrollingIfNecessary(rawX, rawY);
this._dropContainer._sortItem(this, x, y, this._pointerDirectionDelta);
this._preview.style.transform =
getTransform(x - this._pickupPositionInElement.x, y - this._pickupPositionInElement.y);
}
/**
* Creates the element that will be rendered next to the user's pointer
* and will be used as a preview of the element that is being dragged.
*/
_createPreviewElement() {
const previewConfig = this._previewTemplate;
const previewClass = this.previewClass;
const previewTemplate = previewConfig ? previewConfig.template : null;
let preview;
if (previewTemplate && previewConfig) {
// Measure the element before we've inserted the preview
// since the insertion could throw off the measurement.
const rootRect = previewConfig.matchSize ? this._rootElement.getBoundingClientRect() : null;
const viewRef = previewConfig.viewContainer.createEmbeddedView(previewTemplate, previewConfig.context);
viewRef.detectChanges();
preview = getRootNode(viewRef, this._document);
this._previewRef = viewRef;
if (previewConfig.matchSize) {
matchElementSize(preview, rootRect);
}
else {
preview.style.transform =
getTransform(this._pickupPositionOnPage.x, this._pickupPositionOnPage.y);
}
}
else {
const element = this._rootElement;
preview = deepCloneNode(element);
matchElementSize(preview, element.getBoundingClientRect());
}
extendStyles(preview.style, {
// It's important that we disable the pointer events on the preview, because
// it can throw off the `document.elementFromPoint` calls in the `CdkDropList`.
pointerEvents: 'none',
// We have to reset the margin, because it can throw off positioning relative to the viewport.
margin: '0',
position: 'fixed',
top: '0',
left: '0',
zIndex: `${this._config.zIndex || 1000}`
});
toggleNativeDragInteractions(preview, false);
preview.classList.add('cdk-drag-preview');
preview.setAttribute('dir', this._direction);
if (previewClass) {
if (Array.isArray(previewClass)) {
previewClass.forEach(className => preview.classList.add(className));
}
else {
preview.classList.add(previewClass);
}
}
return preview;
}
/**
* Animates the preview element from its current position to the location of the drop placeholder.
* @returns Promise that resolves when the animation completes.
*/
_animatePreviewToPlaceholder() {
// If the user hasn't moved yet, the transitionend event won't fire.
if (!this._hasMoved) {
return Promise.resolve();
}
const placeholderRect = this._placeholder.getBoundingClientRect();
// Apply the class that adds a transition to the preview.
this._preview.classList.add('cdk-drag-animating');
// Move the preview to the placeholder position.
this._preview.style.transform = getTransform(placeholderRect.left, placeholderRect.top);
// If the element doesn't have a `transition`, the `transitionend` event won't fire. Since
// we need to trigger a style recalculation in order for the `cdk-drag-animating` class to
// apply its style, we take advantage of the available info to figure out whether we need to
// bind the event in the first place.
const duration = getTransformTransitionDurationInMs(this._preview);
if (duration === 0) {
return Promise.resolve();
}
return this._ngZone.runOutsideAngular(() => {
return new Promise(resolve => {
const handler = ((event) => {
if (!event || (event.target === this._preview && event.propertyName === 'transform')) {
this._preview.removeEventListener('transitionend', handler);
resolve();
clearTimeout(timeout);
}
});
// If a transition is short enough, the browser might not fire the `transitionend` event.
// Since we know how long it's supposed to take, add a timeout with a 50% buffer that'll
// fire if the transition hasn't completed when it was supposed to.
const timeout = setTimeout(handler, duration * 1.5);
this._preview.addEventListener('transitionend', handler);
});
});
}
/** Creates an element that will be shown instead of the current element while dragging. */
_createPlaceholderElement() {
const placeholderConfig = this._placeholderTemplate;
const placeholderTemplate = placeholderConfig ? placeholderConfig.template : null;
let placeholder;
if (placeholderTemplate) {
this._placeholderRef = placeholderConfig.viewContainer.createEmbeddedView(placeholderTemplate, placeholderConfig.context);
this._placeholderRef.detectChanges();
placeholder = getRootNode(this._placeholderRef, this._document);
}
else {
placeholder = deepCloneNode(this._rootElement);
}
placeholder.classList.add('cdk-drag-placeholder');
return placeholder;
}
/**
* Figures out the coordinates at which an element was picked up.
* @param referenceElement Element that initiated the dragging.
* @param event Event that initiated the dragging.
*/
_getPointerPositionInElement(referenceElement, event) {
const elementRect = this._rootElement.getBoundingClientRect();
const handleElement = referenceElement === this._rootElement ? null : referenceElement;
const referenceRect = handleElement ? handleElement.getBoundingClientRect() : elementRect;
const point = isTouchEvent(event) ? event.targetTouches[0] : event;
const scrollPosition = this._getViewportScrollPosition();
const x = point.pageX - referenceRect.left - scrollPosition.left;
const y = point.pageY - referenceRect.top - scrollPosition.top;
return {
x: referenceRect.left - elementRect.left + x,
y: referenceRect.top - elementRect.top + y
};
}
/** Determines the point of the page that was touched by the user. */
_getPointerPositionOnPage(event) {
const scrollPosition = this._getViewportScrollPosition();
const point = isTouchEvent(event) ?
// `touches` will be empty for start/end events so we have to fall back to `changedTouches`.
// Also note that on real devices we're guaranteed for either `touches` or `changedTouches`
// to have a value, but Firefox in device emulation mode has a bug where both can be empty
// for `touchstart` and `touchend` so we fall back to a dummy object in order to avoid
// throwing an error. The value returned here will be incorrect, but since this only
// breaks inside a developer tool and the value is only used for secondary information,
// we can get away with it. See https://bugzilla.mozilla.org/show_bug.cgi?id=1615824.
(event.touches[0] || event.changedTouches[0] || { pageX: 0, pageY: 0 }) : event;
const x = point.pageX - scrollPosition.left;
const y = point.pageY - scrollPosition.top;
// if dragging SVG element, try to convert from the screen coordinate system to the SVG
// coordinate system
if (this._ownerSVGElement) {
const svgMatrix = this._ownerSVGElement.getScreenCTM();
if (svgMatrix) {
const svgPoint = this._ownerSVGElement.createSVGPoint();
svgPoint.x = x;
svgPoint.y = y;
return svgPoint.matrixTransform(svgMatrix.inverse());
}
}
return { x, y };
}
/** Gets the pointer position on the page, accounting for any position constraints. */
_getConstrainedPointerPosition(point) {
const dropContainerLock = this._dropContainer ? this._dropContainer.lockAxis : null;
let { x, y } = this.constrainPosition ? this.constrainPosition(point, this) : point;
if (this.lockAxis === 'x' || dropContainerLock === 'x') {
y = this._pickupPositionOnPage.y;
}
else if (this.lockAxis === 'y' || dropContainerLock === 'y') {
x = this._pickupPositionOnPage.x;
}
if (this._boundaryRect) {
const { x: pickupX, y: pickupY } = this._pickupPositionInElement;
const boundaryRect = this._boundaryRect;
const previewRect = this._previewRect;
const minY = boundaryRect.top + pickupY;
const maxY = boundaryRect.bottom - (previewRect.height - pickupY);
const minX = boundaryRect.left + pickupX;
const maxX = boundaryRect.right - (previewRect.width - pickupX);
x = clamp(x, minX, maxX);
y = clamp(y, minY, maxY);
}
return { x, y };
}
/** Updates the current drag delta, based on the user's current pointer position on the page. */
_updatePointerDirectionDelta(pointerPositionOnPage) {
const { x, y } = pointerPositionOnPage;
const delta = this._pointerDirectionDelta;
const positionSinceLastChange = this._pointerPositionAtLastDirectionChange;
// Amount of pixels the user has dragged since the last time the direction changed.
const changeX = Math.abs(x - positionSinceLastChange.x);
const changeY = Math.abs(y - positionSinceLastChange.y);
// Because we handle pointer events on a per-pixel basis, we don't want the delta
// to change for every pixel, otherwise anything that depends on it can look erratic.
// To make the delta more consistent, we track how much the user has moved since the last
// delta change and we only update it after it has reached a certain threshold.
if (changeX > this._config.pointerDirectionChangeThreshold) {
delta.x = x > positionSinceLastChange.x ? 1 : -1;
positionSinceLastChange.x = x;
}
if (changeY > this._config.pointerDirectionChangeThreshold) {
delta.y = y > positionSinceLastChange.y ? 1 : -1;
positionSinceLastChange.y = y;
}
return delta;
}
/** Toggles the native drag interactions, based on how many handles are registered. */
_toggleNativeDragInteractions() {
if (!this._rootElement || !this._handles) {
return;
}
const shouldEnable = this._handles.length > 0 || !this.isDragging();
if (shouldEnable !== this._nativeInteractionsEnabled) {
this._nativeInteractionsEnabled = shouldEnable;
toggleNativeDragInteractions(this._rootElement, shouldEnable);
}
}
/** Removes the manually-added event listeners from the root element. */
_removeRootElementListeners(element) {
element.removeEventListener('mousedown', this._pointerDown, activeEventListenerOptions);
element.removeEventListener('touchstart', this._pointerDown, passiveEventListenerOptions);
}
/**
* Applies a `transform` to the root element, taking into account any existing transforms on it.
* @param x New transform value along the X axis.
* @param y New transform value along the Y axis.
*/
_applyRootElementTransform(x, y) {
const transform = getTransform(x, y);
// Cache the previous transform amount only after the first drag sequence, because
// we don't want our own transforms to stack on top of each other.
if (this._initialTransform == null) {
this._initialTransform = this._rootElement.style.transform || '';
}
// Preserve the previous `transform` value, if there was one. Note that we apply our own
// transform before the user's, because things like rotation can affect which direction
// the element will be translated towards.
this._rootElement.style.transform = this._initialTransform ?
transform + ' ' + this._initialTransform : transform;
}
/**
* Gets the distance that the user has dragged during the current drag sequence.
* @param currentPosition Current position of the user's pointer.
*/
_getDragDistance(currentPosition) {
const pickupPosition = this._pickupPositionOnPage;
if (pickupPosition) {
return { x: currentPosition.x - pickupPosition.x, y: currentPosition.y - pickupPosition.y };
}
return { x: 0, y: 0 };
}
/** Cleans up any cached element dimensions that we don't need after dragging has stopped. */
_cleanupCachedDimensions() {
this._boundaryRect = this._previewRect = undefined;
this._parentPositions.clear();
}
/**
* Checks whether the element is still inside its boundary after the viewport has been resized.
* If not, the position is adjusted so that the element fits again.
*/
_containInsideBoundaryOnResize() {
let { x, y } = this._passiveTransform;
if ((x === 0 && y === 0) || this.isDragging() || !this._boundaryElement) {
return;
}
const boundaryRect = this._boundaryElement.getBoundingClientRect();
const elementRect = this._rootElement.getBoundingClientRect();
// It's possible that the element got hidden away after dragging (e.g. by switching to a
// different tab). Don't do anything in this case so we don't clear the user's position.
if ((boundaryRect.width === 0 && boundaryRect.height === 0) ||
(elementRect.width === 0 && elementRect.height === 0)) {
return;
}
const leftOverflow = boundaryRect.left - elementRect.left;
const rightOverflow = elementRect.right - boundaryRect.right;
const topOverflow = boundaryRect.top - elementRect.top;
const bottomOverflow = elementRect.bottom - boundaryRect.bottom;
// If the element has become wider than the boundary, we can't
// do much to make it fit so we just anchor it to the left.
if (boundaryRect.width > elementRect.width) {
if (leftOverflow > 0) {
x += leftOverflow;
}
if (rightOverflow > 0) {
x -= rightOverflow;
}
}
else {
x = 0;
}
// If the element has become taller than the boundary, we can't
// do much to make it fit so we just anchor it to the top.
if (boundaryRect.height > elementRect.height) {
if (topOverflow > 0) {
y += topOverflow;
}
if (bottomOverflow > 0) {
y -= bottomOverflow;
}
}
else {
y = 0;
}
if (x !== this._passiveTransform.x || y !== this._passiveTransform.y) {
this.setFreeDragPosition({ y, x });
}
}
/** Gets the drag start delay, based on the event type. */
_getDragStartDelay(event) {
const value = this.dragStartDelay;
if (typeof value === 'number') {
return value;
}
else if (isTouchEvent(event)) {
return value.touch;
}
return value ? value.mouse : 0;
}
/** Updates the internal state of the draggable element when scrolling has occurred. */
_updateOnScroll(event) {
const scrollDifference = this._parentPositions.handleScroll(event);
if (scrollDifference) {
const target = event.target;
// ClientRect dimensions are based on the scroll position of the page and its parent node so
// we have to update the cached boundary ClientRect if the user has scrolled. Check for
// the `document` specifically since IE doesn't support `contains` on it.
if (this._boundaryRect && (target === this._document ||
(target !== this._boundaryElement && target.contains(this._boundaryElement)))) {
adjustClientRect(this._boundaryRect, scrollDifference.top, scrollDifference.left);
}
this._pickupPositionOnPage.x += scrollDifference.left;
this._pickupPositionOnPage.y += scrollDifference.top;
// If we're in free drag mode, we have to update the active transform, because
// it isn't relative to the viewport like the preview inside a drop list.
if (!this._dropContainer) {
this._activeTransform.x -= scrollDifference.left;
this._activeTransform.y -= scrollDifference.top;
this._applyRootElementTransform(this._activeTransform.x, this._activeTransform.y);
}
}
}
/** Gets the scroll position of the viewport. */
_getViewportScrollPosition() {
const cachedPosition = this._parentPositions.positions.get(this._document);
return cachedPosition ? cachedPosition.scrollPosition :
this._viewportRuler.getViewportScrollPosition();
}
/**
* Lazily resolves and returns the shadow root of the element. We do this in a function, rather
* than saving it in property directly on init, because we want to resolve it as late as possible
* in order to ensure that the element has been moved into the shadow DOM. Doing it inside the
* constructor might be too early if the element is inside of something like `ngFor` or `ngIf`.
*/
_getShadowRoot() {
if (this._cachedShadowRoot === undefined) {
this._cachedShadowRoot = _getShadowRoot(this._rootElement);
}
return this._cachedShadowRoot;
}
}
/**
* Gets a 3d `transform` that can be applied to an element.
* @param x Desired position of the element along the X axis.
* @param y Desired position of the element along the Y axis.
*/
function getTransform(x, y) {
// Round the transforms since some browsers will
// blur the elements for sub-pixel transforms.
return `translate3d(${Math.round(x)}px, ${Math.round(y)}px, 0)`;
}
/** Clamps a value between a minimum and a maximum. */
function clamp(value, min, max) {
return Math.max(min, Math.min(max, value));
}
/**
* Helper to remove a node from the DOM and to do all the necessary null checks.
* @param node Node to be removed.
*/
function removeNode(node) {
if (node && node.parentNode) {
node.parentNode.removeChild(node);
}
}
/** Determines whether an event is a touch event. */
function isTouchEvent(event) {
// This function is called for every pixel that the user has dragged so we need it to be
// as fast as possible. Since we only bind mouse events and touch events, we can assume
// that if the event's name starts with `t`, it's a touch event.
return event.type[0] === 't';
}
/** Gets the element into which the drag preview should be inserted. */
function getPreviewInsertionPoint(documentRef, shadowRoot) {
// We can't use the body if the user is in fullscreen mode,
// because the preview will render under the fullscreen element.
// TODO(crisbeto): dedupe this with the `FullscreenOverlayContainer` eventually.
return shadowRoot ||
documentRef.fullscreenElement ||
documentRef.webkitFullscreenElement ||
documentRef.mozFullScreenElement ||
documentRef.msFullscreenElement ||
documentRef.body;
}
/**
* Gets the root HTML element of an embedded view.
* If the root is not an HTML element it gets wrapped in one.
*/
function getRootNode(viewRef, _document) {
const rootNodes = viewRef.rootNodes;
if (rootNodes.length === 1 && rootNodes[0].nodeType === _document.ELEMENT_NODE) {
return rootNodes[0];
}
const wrapper = _document.createElement('div');
rootNodes.forEach(node => wrapper.appendChild(node));
return wrapper;
}
/**
* Matches the target element's size to the source's size.
* @param target Element that needs to be resized.
* @param sourceRect Dimensions of the source element.
*/
function matchElementSize(target, sourceRect) {
target.style.width = `${sourceRect.width}px`;
target.style.height = `${sourceRect.height}px`;
target.style.transform = getTransform(sourceRect.left, sourceRect.top);
}
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
/**
* Moves an item one index in an array to another.
* @param array Array in which to move the item.
* @param fromIndex Starting index of the item.
* @param toIndex Index to which the item should be moved.
*/
function moveItemInArray(array, fromIndex, toIndex) {
const from = clamp$1(fromIndex, array.length - 1);
const to = clamp$1(toIndex, array.length - 1);
if (from === to) {
return;
}
const target = array[from];
const delta = to < from ? -1 : 1;
for (let i = from; i !== to; i += delta) {
array[i] = array[i + delta];
}
array[to] = target;
}
/**
* Moves an item from one array to another.
* @param currentArray Array from which to transfer the item.
* @param targetArray Array into which to put the item.
* @param currentIndex Index of the item in its current array.
* @param targetIndex Index at which to insert the item.
*/
function transferArrayItem(currentArray, targetArray, currentIndex, targetIndex) {
const from = clamp$1(currentIndex, currentArray.length - 1);
const to = clamp$1(targetIndex, targetArray.length);
if (currentArray.length) {
targetArray.splice(to, 0, currentArray.splice(from, 1)[0]);
}
}
/**
* Copies an item from one array to another, leaving it in its
* original position in current array.
* @param currentArray Array from which to copy the item.
* @param targetArray Array into which is copy the item.
* @param currentIndex Index of the item in its current array.
* @param targetIndex Index at which to insert the item.
*
*/
function copyArrayItem(currentArray, targetArray, currentIndex, targetIndex) {
const to = clamp$1(targetIndex, targetArray.length);
if (currentArray.length) {
targetArray.splice(to, 0, currentArray[currentIndex]);
}
}
/** Clamps a number between zero and a maximum. */
function clamp$1(value, max) {
return Math.max(0, Math.min(max, value));
}
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
/**
* Proximity, as a ratio to width/height, at which a
* dragged item will affect the drop container.
*/
const DROP_PROXIMITY_THRESHOLD = 0.05;
/**
* Proximity, as a ratio to width/height at which to start auto-scrolling the drop list or the
* viewport. The value comes from trying it out manually until it feels right.
*/
const SCROLL_PROXIMITY_THRESHOLD = 0.05;
/**
* Reference to a drop list. Used to manipulate or dispose of the container.
*/
class DropListRef {
constructor(element, _dragDropRegistry, _document, _ngZone, _viewportRuler) {
this._dragDropRegistry = _dragDropRegistry;
this._ngZone = _ngZone;
this._viewportRuler = _viewportRuler;
/** Whether starting a dragging sequence from this container is disabled. */
this.disabled = false;
/** Whether sorting items within the list is disabled. */
this.sortingDisabled = false;
/**
* Whether auto-scrolling the view when the user
* moves their pointer close to the edges is disabled.
*/
this.autoScrollDisabled = false;
/** Number of pixels to scroll for each frame when auto-scrolling an element. */
this.autoScrollStep = 2;
/**
* Function that is used to determine whether an item
* is allowed to be moved into a drop container.
*/
this.enterPredicate = () => true;
/** Functions that is used to determine whether an item can be sorted into a particular index. */
this.sortPredicate = () => true;
/** Emits right before dragging has started. */
this.beforeStarted = new Subject();
/**
* Emits when the user has moved a new drag item into this container.
*/
this.entered = new Subject();
/**
* Emits when the user removes an item from the container
* by dragging it into another container.
*/
this.exited = new Subject();
/** Emits when the user drops an item inside the container. */
this.dropped = new Subject();
/** Emits as the user is swapping items while actively dragging. */
this.sorted = new Subject();
/** Whether an item in the list is being dragged. */
this._isDragging = false;
/** Cache of the dimensions of all the items inside the container. */
this._itemPositions = [];
/**
* Keeps track of the item that was last swapped with the dragged item, as well as what direction
* the pointer was moving in when the swap occured and whether the user's pointer continued to
* overlap with the swapped item after the swapping occurred.
*/
this._previousSwap = { drag: null, delta: 0, overlaps: false };
/** Draggable items in the container. */
this._draggables = [];
/** Drop lists that are connected to the current one. */
this._siblings = [];
/** Direction in which the list is oriented. */
this._orientation = 'vertical';
/** Connected siblings that currently have a dragged item. */
this._activeSiblings = new Set();
/** Layout direction of the drop list. */
this._direction = 'ltr';
/** Subscription to the window being scrolled. */
this._viewportScrollSubscription = Subscription.EMPTY;
/** Vertical direction in which the list is currently scrolling. */
this._verticalScrollDirection = 0 /* NONE */;
/** Horizontal direction in which the list is currently scrolling. */
this._horizontalScrollDirection = 0 /* NONE */;
/** Used to signal to the current auto-scroll sequence when to stop. */
this._stopScrollTimers = new Subject();
/** Shadow root of the current element. Necessary for `elementFromPoint` to resolve correctly. */
this._cachedShadowRoot = null;
/** Starts the interval that'll auto-scroll the element. */
this._startScrollInterval = () => {
this._stopScrolling();
interval(0, animationFrameScheduler)
.pipe(takeUntil(this._stopScrollTimers))
.subscribe(() => {
const node = this._scrollNode;
const scrollStep = this.autoScrollStep;
if (this._verticalScrollDirection === 1 /* UP */) {
incrementVerticalScroll(node, -scrollStep);
}
else if (this._verticalScrollDirection === 2 /* DOWN */) {
incrementVerticalScroll(node, scrollStep);
}
if (this._horizontalScrollDirection === 1 /* LEFT */) {
incrementHorizontalScroll(node, -scrollStep);
}
else if (this._horizontalScrollDirection === 2 /* RIGHT */) {
incrementHorizontalScroll(node, scrollStep);
}
});
};
this.element = coerceElement(element);
this._document = _document;
this.withScrollableParents([this.element]);
_dragDropRegistry.registerDropContainer(this);
this._parentPositions = new ParentPositionTracker(_document, _viewportRuler);
}
/** Removes the drop list functionality from the DOM element. */
dispose() {
this._stopScrolling();
this._stopScrollTimers.complete();
this._viewportScrollSubscription.unsubscribe();
this.beforeStarted.complete();
this.entered.complete();
this.exited.complete();
this.dropped.complete();
this.sorted.complete();
this._activeSiblings.clear();
this._scrollNode = null;
this._parentPositions.clear();
this._dragDropRegistry.removeDropContainer(this);
}
/** Whether an item from this list is currently being dragged. */
isDragging() {
return this._isDragging;
}
/** Starts dragging an item. */
start() {
this._draggingStarted();
this._notifyReceivingSiblings();
}
/**
* Emits an event to indicate that the user moved an item into the container.
* @param item Item that was moved into the container.
* @param pointerX Position of the item along the X axis.
* @param pointerY Position of the item along the Y axis.
* @param index Index at which the item entered. If omitted, the container will try to figure it
* out automatically.
*/
enter(item, pointerX, pointerY, index) {
this._draggingStarted();
// If sorting is disabled, we want the item to return to its starting
// position if the user is returning it to its initial container.
let newIndex;
if (index == null) {
newIndex = this.sortingDisabled ? this._draggables.indexOf(item) : -1;
if (newIndex === -1) {
// We use the coordinates of where the item entered the drop
// zone to figure out at which index it should be inserted.
newIndex = this._getItemIndexFromPointerPosition(item, pointerX, pointerY);
}
}
else {
newIndex = index;
}
const activeDraggables = this._activeDraggables;
const currentIndex = activeDraggables.indexOf(item);
const placeholder = item.getPlaceholderElement();
let newPositionReference = activeDraggables[newIndex];
// If the item at the new position is the same as the item that is being dragged,
// it means that we're trying to restore the item to its initial position. In this
// case we should use the next item from the list as the reference.
if (newPositionReference === item) {
newPositionReference = activeDraggables[newIndex + 1];
}
// Since the item may be in the `activeDraggables` already (e.g. if the user dragged it
// into another container and back again), we have to ensure that it isn't duplicated.
if (currentIndex > -1) {
activeDraggables.splice(currentIndex, 1);
}
// Don't use items that are being dragged as a reference, because
// their element has been moved down to the bottom of the body.
if (newPositionReference && !this._dragDropRegistry.isDragging(newPositionReference)) {
const element = newPositionReference.getRootElement();
element.parentElement.insertBefore(placeholder, element);
activeDraggables.splice(newIndex, 0, item);
}
else if (this._shouldEnterAsFirstChild(pointerX, pointerY)) {
const reference = activeDraggables[0].getRootElement();
reference.parentNode.insertBefore(placeholder, reference);
activeDraggables.unshift(item);
}
else {
coerceElement(this.element).appendChild(placeholder);
activeDraggables.push(item);
}
// The transform needs to be cleared so it doesn't throw off the measurements.
placeholder.style.transform = '';
// Note that the positions were already cached when we called `start` above,
// but we need to refresh them since the amount of items has changed and also parent rects.
this._cacheItemPositions();
this._cacheParentPositions();
// Notify siblings at the end so that the item has been inserted into the `activeDraggables`.
this._notifyReceivingSiblings();
this.entered.next({ item, container: this, currentIndex: this.getItemIndex(item) });
}
/**
* Removes an item from the container after it was dragged into another container by the user.
* @param item Item that was dragged out.
*/
exit(item) {
this._reset();
this.exited.next({ item, container: this });
}
/**
* Drops an item into this container.
* @param item Item being dropped into the container.
* @param currentIndex Index at which the item should be inserted.
* @param previousIndex Index of the item when dragging started.
* @param previousContainer Container from which the item got dragged in.
* @param isPointerOverContainer Whether the user's pointer was over the
* container when the item was dropped.
* @param distance Distance the user has dragged since the start of the dragging sequence.
*/
drop(item, currentIndex, previousIndex, previousContainer, isPointerOverContainer, distance) {
this._reset();
this.dropped.next({
item,
currentIndex,
previousIndex,
container: this,
previousContainer,
isPointerOverContainer,
distance
});
}
/**
* Sets the draggable items that are a part of this list.
* @param items Items that are a part of this list.
*/
withItems(items) {
const previousItems = this._draggables;
this._draggables = items;
items.forEach(item => item._withDropContainer(this));
if (this.isDragging()) {
const draggedItems = previousItems.filter(item => item.isDragging());
// If all of the items being dragged were removed
// from the list, abort the current drag sequence.
if (draggedItems.every(item => items.indexOf(item) === -1)) {
this._reset();
}
else {
this._cacheItems();
}
}
return this;
}
/** Sets the layout direction of the drop list. */
withDirection(direction) {
this._direction = direction;
return this;
}
/**
* Sets the containers that are connected to this one. When two or more containers are
* connected, the user will be allowed to transfer items between them.
* @param connectedTo Other containers that the current containers should be connected to.
*/
connectedTo(connectedTo) {
this._siblings = connectedTo.slice();
return this;
}
/**
* Sets the orientation of the container.
* @param orientation New orientation for the container.
*/
withOrientation(orientation) {
this._orientation = orientation;
return this;
}
/**
* Sets which parent elements are can be scrolled while the user is dragging.
* @param elements Elements that can be scrolled.
*/
withScrollableParents(elements) {
const element = coerceElement(this.element);
// We always allow the current element to be scrollable
// so we need to ensure that it's in the array.
this._scrollableElements =
elements.indexOf(element) === -1 ? [element, ...elements] : elements.slice();
return this;
}
/** Gets the scrollable parents that are registered with this drop container. */
getScrollableParents() {
return this._scrollableElements;
}
/**
* Figures out the index of an item in the container.
* @param item Item whose index should be determined.
*/
getItemIndex(item) {
if (!this._isDragging) {
return this._draggables.indexOf(item);
}
// Items are sorted always by top/left in the cache, however they flow differently in RTL.
// The rest of the logic still stands no matter what orientation we're in, however
// we need to invert the array when determining the index.
const items = this._orientation === 'horizontal' && this._direction === 'rtl' ?
this._itemPositions.slice().reverse() : this._itemPositions;
return findIndex(items, currentItem => currentItem.drag === item);
}
/**
* Whether the list is able to receive the item that
* is currently being dragged inside a connected drop list.
*/
isReceiving() {
return this._activeSiblings.size > 0;
}
/**
* Sorts an item inside the container based on its position.
* @param item Item to be sorted.
* @param pointerX Position of the item along the X axis.
* @param pointerY Position of the item along the Y axis.
* @param pointerDelta Direction in which the pointer is moving along each axis.
*/
_sortItem(item, pointerX, pointerY, pointerDelta) {
// Don't sort the item if sorting is disabled or it's out of range.
if (this.sortingDisabled || !this._clientRect ||
!isPointerNearClientRect(this._clientRect, DROP_PROXIMITY_THRESHOLD, pointerX, pointerY)) {
return;
}
const siblings = this._itemPositions;
const newIndex = this._getItemIndexFromPointerPosition(item, pointerX, pointerY, pointerDelta);
if (newIndex === -1 && siblings.length > 0) {
return;
}
const isHorizontal = this._orientation === 'horizontal';
const currentIndex = findIndex(siblings, currentItem => currentItem.drag === item);
const siblingAtNewPosition = siblings[newIndex];
const currentPosition = siblings[currentIndex].clientRect;
const newPosition = siblingAtNewPosition.clientRect;
const delta = currentIndex > newIndex ? 1 : -1;
// How many pixels the item's placeholder should be offset.
const itemOffset = this._getItemOffsetPx(currentPosition, newPosition, delta);
// How many pixels all the other items should be offset.
const siblingOffset = this._getSiblingOffsetPx(currentIndex, siblings, delta);
// Save the previous order of the items before moving the item to its new index.
// We use this to check whether an item has been moved as a result of the sorting.
const oldOrder = siblings.slice();
// Shuffle the array in place.
moveItemInArray(siblings, currentIndex, newIndex);
this.sorted.next({
previousIndex: currentIndex,
currentIndex: newIndex,
container: this,
item
});
siblings.forEach((sibling, index) => {
// Don't do anything if the position hasn't changed.
if (oldOrder[index] === sibling) {
return;
}
const isDraggedItem = sibling.drag === item;
const offset = isDraggedItem ? itemOffset : siblingOffset;
const elementToOffset = isDraggedItem ? item.getPlaceholderElement() :
sibling.drag.getRootElement();
// Update the offset to reflect the new position.
sibling.offset += offset;
// Since we're moving the items with a `transform`, we need to adjust their cached
// client rects to reflect their new position, as well as swap their positions in the cache.
// Note that we shouldn't use `getBoundingClientRect` here to update the cache, because the
// elements may be mid-animation which will give us a wrong result.
if (isHorizontal) {
// Round the transforms since some browsers will
// blur the elements, for sub-pixel transforms.
elementToOffset.style.transform = `translate3d(${Math.round(sibling.offset)}px, 0, 0)`;
adjustClientRect(sibling.clientRect, 0, offset);
}
else {
elementToOffset.style.transform = `translate3d(0, ${Math.round(sibling.offset)}px, 0)`;
adjustClientRect(sibling.clientRect, offset, 0);
}
});
// Note that it's important that we do this after the client rects have been adjusted.
this._previousSwap.overlaps = isInsideClientRect(newPosition, pointerX, pointerY);
this._previousSwap.drag = siblingAtNewPosition.drag;
this._previousSwap.delta = isHorizontal ? pointerDelta.x : pointerDelta.y;
}
/**
* Checks whether the user's pointer is close to the edges of either the
* viewport or the drop list and starts the auto-scroll sequence.
* @param pointerX User's pointer position along the x axis.
* @param pointerY User's pointer position along the y axis.
*/
_startScrollingIfNecessary(pointerX, pointerY) {
if (this.autoScrollDisabled) {
return;
}
let scrollNode;
let verticalScrollDirection = 0 /* NONE */;
let horizontalScrollDirection = 0 /* NONE */;
// Check whether we should start scrolling any of the parent containers.
this._parentPositions.positions.forEach((position, element) => {
// We have special handling for the `document` below. Also this would be
// nicer with a for...of loop, but it requires changing a compiler flag.
if (element === this._document || !position.clientRect || scrollNode) {
return;
}
if (isPointerNearClientRect(position.clientRect, DROP_PROXIMITY_THRESHOLD, pointerX, pointerY)) {
[verticalScrollDirection, horizontalScrollDirection] = getElementScrollDirections(element, position.clientRect, pointerX, pointerY);
if (verticalScrollDirection || horizontalScrollDirection) {
scrollNode = element;
}
}
});
// Otherwise check if we can start scrolling the viewport.
if (!verticalScrollDirection && !horizontalScrollDirection) {
const { width, height } = this._viewportRuler.getViewportSize();
const clientRect = { width, height, top: 0, right: width, bottom: height, left: 0 };
verticalScrollDirection = getVerticalScrollDirection(clientRect, pointerY);
horizontalScrollDirection = getHorizontalScrollDirection(clientRect, pointerX);
scrollNode = window;
}
if (scrollNode && (verticalScrollDirection !== this._verticalScrollDirection ||
horizontalScrollDirection !== this._horizontalScrollDirection ||
scrollNode !== this._scrollNode)) {
this._verticalScrollDirection = verticalScrollDirection;
this._horizontalScrollDirection = horizontalScrollDirection;
this._scrollNode = scrollNode;
if ((verticalScrollDirection || horizontalScrollDirection) && scrollNode) {
this._ngZone.runOutsideAngular(this._startScrollInterval);
}
else {
this._stopScrolling();
}
}
}
/** Stops any currently-running auto-scroll sequences. */
_stopScrolling() {
this._stopScrollTimers.next();
}
/** Starts the dragging sequence within the list. */
_draggingStarted() {
const styles = coerceElement(this.element).style;
this.beforeStarted.next();
this._isDragging = true;
// We need to disable scroll snapping while the user is dragging, because it breaks automatic
// scrolling. The browser seems to round the value based on the snapping points which means
// that we can't increment/decrement the scroll position.
this._initialScrollSnap = styles.msScrollSnapType || styles.scrollSnapType || '';
styles.scrollSnapType = styles.msScrollSnapType = 'none';
this._cacheItems();
this._viewportScrollSubscription.unsubscribe();
this._listenToScrollEvents();
}
/** Caches the positions of the configured scrollable parents. */
_cacheParentPositions() {
const element = coerceElement(this.element);
this._parentPositions.cache(this._scrollableElements);
// The list element is always in the `scrollableElements`
// so we can take advantage of the cached `ClientRect`.
this._clientRect = this._parentPositions.positions.get(element).clientRect;
}
/** Refreshes the position cache of the items and sibling containers. */
_cacheItemPositions() {
const isHorizontal = this._orientation === 'horizontal';
this._itemPositions = this._activeDraggables.map(drag => {
const elementToMeasure = drag.getVisibleElement();
return { drag, offset: 0, clientRect: getMutableClientRect(elementToMeasure) };
}).sort((a, b) => {
return isHorizontal ? a.clientRect.left - b.clientRect.left :
a.clientRect.top - b.clientRect.top;
});
}
/** Resets the container to its initial state. */
_reset() {
this._isDragging = false;
const styles = coerceElement(this.element).style;
styles.scrollSnapType = styles.msScrollSnapType = this._initialScrollSnap;
// TODO(crisbeto): may have to wait for the animations to finish.
this._activeDraggables.forEach(item => {
const rootElement = item.getRootElement();
if (rootElement) {
rootElement.style.transform = '';
}
});
this._siblings.forEach(sibling => sibling._stopReceiving(this));
this._activeDraggables = [];
this._itemPositions = [];
this._previousSwap.drag = null;
this._previousSwap.delta = 0;
this._previousSwap.overlaps = false;
this._stopScrolling();
this._viewportScrollSubscription.unsubscribe();
this._parentPositions.clear();
}
/**
* Gets the offset in pixels by which the items that aren't being dragged should be moved.
* @param currentIndex Index of the item currently being dragged.
* @param siblings All of the items in the list.
* @param delta Direction in which the user is moving.
*/
_getSiblingOffsetPx(currentIndex, siblings, delta) {
const isHorizontal = this._orientation === 'horizontal';
const currentPosition = siblings[currentIndex].clientRect;
const immediateSibling = siblings[currentIndex + delta * -1];
let siblingOffset = currentPosition[isHorizontal ? 'width' : 'height'] * delta;
if (immediateSibling) {
const start = isHorizontal ? 'left' : 'top';
const end = isHorizontal ? 'right' : 'bottom';
// Get the spacing between the start of the current item and the end of the one immediately
// after it in the direction in which the user is dragging, or vice versa. We add it to the
// offset in order to push the element to where it will be when it's inline and is influenced
// by the `margin` of its siblings.
if (delta === -1) {
siblingOffset -= immediateSibling.clientRect[start] - currentPosition[end];
}
else {
siblingOffset += currentPosition[start] - immediateSibling.clientRect[end];
}
}
return siblingOffset;
}
/**
* Gets the offset in pixels by which the item that is being dragged should be moved.
* @param currentPosition Current position of the item.
* @param newPosition Position of the item where the current item should be moved.
* @param delta Direction in which the user is moving.
*/
_getItemOffsetPx(currentPosition, newPosition, delta) {
const isHorizontal = this._orientation === 'horizontal';
let itemOffset = isHorizontal ? newPosition.left - currentPosition.left :
newPosition.top - currentPosition.top;
// Account for differences in the item width/height.
if (delta === -1) {
itemOffset += isHorizontal ? newPosition.width - currentPosition.width :
newPosition.height - currentPosition.height;
}
return itemOffset;
}
/**
* Checks if pointer is entering in the first position
* @param pointerX Position of the user's pointer along the X axis.
* @param pointerY Position of the user's pointer along the Y axis.
*/
_shouldEnterAsFirstChild(pointerX, pointerY) {
if (!this._activeDraggables.length) {
return false;
}
const itemPositions = this._itemPositions;
const isHorizontal = this._orientation === 'horizontal';
// `itemPositions` are sorted by position while `activeDraggables` are sorted by child index
// check if container is using some sort of "reverse" ordering (eg: flex-direction: row-reverse)
const reversed = itemPositions[0].drag !== this._activeDraggables[0];
if (reversed) {
const lastItemRect = itemPositions[itemPositions.length - 1].clientRect;
return isHorizontal ? pointerX >= lastItemRect.right : pointerY >= lastItemRect.bottom;
}
else {
const firstItemRect = itemPositions[0].clientRect;
return isHorizontal ? pointerX <= firstItemRect.left : pointerY <= firstItemRect.top;
}
}
/**
* Gets the index of an item in the drop container, based on the position of the user's pointer.
* @param item Item that is being sorted.
* @param pointerX Position of the user's pointer along the X axis.
* @param pointerY Position of the user's pointer along the Y axis.
* @param delta Direction in which the user is moving their pointer.
*/
_getItemIndexFromPointerPosition(item, pointerX, pointerY, delta) {
const isHorizontal = this._orientation === 'horizontal';
const index = findIndex(this._itemPositions, ({ drag, clientRect }, _, array) => {
if (drag === item) {
// If there's only one item left in the container, it must be
// the dragged item itself so we use it as a reference.
return array.length < 2;
}
if (delta) {
const direction = isHorizontal ? delta.x : delta.y;
// If the user is still hovering over the same item as last time, their cursor hasn't left
// the item after we made the swap, and they didn't change the direction in which they're
// dragging, we don't consider it a direction swap.
if (drag === this._previousSwap.drag && this._previousSwap.overlaps &&
direction === this._previousSwap.delta) {
return false;
}
}
return isHorizontal ?
// Round these down since most browsers report client rects with
// sub-pixel precision, whereas the pointer coordinates are rounded to pixels.
pointerX >= Math.floor(clientRect.left) && pointerX < Math.floor(clientRect.right) :
pointerY >= Math.floor(clientRect.top) && pointerY < Math.floor(clientRect.bottom);
});
return (index === -1 || !this.sortPredicate(index, item, this)) ? -1 : index;
}
/** Caches the current items in the list and their positions. */
_cacheItems() {
this._activeDraggables = this._draggables.slice();
this._cacheItemPositions();
this._cacheParentPositions();
}
/**
* Checks whether the user's pointer is positioned over the container.
* @param x Pointer position along the X axis.
* @param y Pointer position along the Y axis.
*/
_isOverContainer(x, y) {
return this._clientRect != null && isInsideClientRect(this._clientRect, x, y);
}
/**
* Figures out whether an item should be moved into a sibling
* drop container, based on its current position.
* @param item Drag item that is being moved.
* @param x Position of the item along the X axis.
* @param y Position of the item along the Y axis.
*/
_getSiblingContainerFromPosition(item, x, y) {
return this._siblings.find(sibling => sibling._canReceive(item, x, y));
}
/**
* Checks whether the drop list can receive the passed-in item.
* @param item Item that is being dragged into the list.
* @param x Position of the item along the X axis.
* @param y Position of the item along the Y axis.
*/
_canReceive(item, x, y) {
if (!this._clientRect || !isInsideClientRect(this._clientRect, x, y) ||
!this.enterPredicate(item, this)) {
return false;
}
const elementFromPoint = this._getShadowRoot().elementFromPoint(x, y);
// If there's no element at the pointer position, then
// the client rect is probably scrolled out of the view.
if (!elementFromPoint) {
return false;
}
const nativeElement = coerceElement(this.element);
// The `ClientRect`, that we're using to find the container over which the user is
// hovering, doesn't give us any information on whether the element has been scrolled
// out of the view or whether it's overlapping with other containers. This means that
// we could end up transferring the item into a container that's invisible or is positioned
// below another one. We use the result from `elementFromPoint` to get the top-most element
// at the pointer position and to find whether it's one of the intersecting drop containers.
return elementFromPoint === nativeElement || nativeElement.contains(elementFromPoint);
}
/**
* Called by one of the connected drop lists when a dragging sequence has started.
* @param sibling Sibling in which dragging has started.
*/
_startReceiving(sibling, items) {
const activeSiblings = this._activeSiblings;
if (!activeSiblings.has(sibling) && items.every(item => {
// Note that we have to add an exception to the `enterPredicate` for items that started off
// in this drop list. The drag ref has logic that allows an item to return to its initial
// container, if it has left the initial container and none of the connected containers
// allow it to enter. See `DragRef._updateActiveDropContainer` for more context.
return this.enterPredicate(item, this) || this._draggables.indexOf(item) > -1;
})) {
activeSiblings.add(sibling);
this._cacheParentPositions();
this._listenToScrollEvents();
}
}
/**
* Called by a connected drop list when dragging has stopped.
* @param sibling Sibling whose dragging has stopped.
*/
_stopReceiving(sibling) {
this._activeSiblings.delete(sibling);
this._viewportScrollSubscription.unsubscribe();
}
/**
* Starts listening to scroll events on the viewport.
* Used for updating the internal state of the list.
*/
_listenToScrollEvents() {
this._viewportScrollSubscription = this._dragDropRegistry.scroll.subscribe(event => {
if (this.isDragging()) {
const scrollDifference = this._parentPositions.handleScroll(event);
if (scrollDifference) {
// Since we know the amount that the user has scrolled we can shift all of the
// client rectangles ourselves. This is cheaper than re-measuring everything and
// we can avoid inconsistent behavior where we might be measuring the element before
// its position has changed.
this._itemPositions.forEach(({ clientRect }) => {
adjustClientRect(clientRect, scrollDifference.top, scrollDifference.left);
});
// We need two loops for this, because we want all of the cached
// positions to be up-to-date before we re-sort the item.
this._itemPositions.forEach(({ drag }) => {
if (this._dragDropRegistry.isDragging(drag)) {
// We need to re-sort the item manually, because the pointer move
// events won't be dispatched while the user is scrolling.
drag._sortFromLastPointerPosition();
}
});
}
}
else if (this.isReceiving()) {
this._cacheParentPositions();
}
});
}
/**
* Lazily resolves and returns the shadow root of the element. We do this in a function, rather
* than saving it in property directly on init, because we want to resolve it as late as possible
* in order to ensure that the element has been moved into the shadow DOM. Doing it inside the
* constructor might be too early if the element is inside of something like `ngFor` or `ngIf`.
*/
_getShadowRoot() {
if (!this._cachedShadowRoot) {
const shadowRoot = _getShadowRoot(coerceElement(this.element));
this._cachedShadowRoot = shadowRoot || this._document;
}
return this._cachedShadowRoot;
}
/** Notifies any siblings that may potentially receive the item. */
_notifyReceivingSiblings() {
const draggedItems = this._activeDraggables.filter(item => item.isDragging());
this._siblings.forEach(sibling => sibling._startReceiving(this, draggedItems));
}
}
/**
* Finds the index of an item that matches a predicate function. Used as an equivalent
* of `Array.prototype.findIndex` which isn't part of the standard Google typings.
* @param array Array in which to look for matches.
* @param predicate Function used to determine whether an item is a match.
*/
function findIndex(array, predicate) {
for (let i = 0; i < array.length; i++) {
if (predicate(array[i], i, array)) {
return i;
}
}
return -1;
}
/**
* Increments the vertical scroll position of a node.
* @param node Node whose scroll position should change.
* @param amount Amount of pixels that the `node` should be scrolled.
*/
function incrementVerticalScroll(node, amount) {
if (node === window) {
node.scrollBy(0, amount);
}
else {
// Ideally we could use `Element.scrollBy` here as well, but IE and Edge don't support it.
node.scrollTop += amount;
}
}
/**
* Increments the horizontal scroll position of a node.
* @param node Node whose scroll position should change.
* @param amount Amount of pixels that the `node` should be scrolled.
*/
function incrementHorizontalScroll(node, amount) {
if (node === window) {
node.scrollBy(amount, 0);
}
else {
// Ideally we could use `Element.scrollBy` here as well, but IE and Edge don't support it.
node.scrollLeft += amount;
}
}
/**
* Gets whether the vertical auto-scroll direction of a node.
* @param clientRect Dimensions of the node.
* @param pointerY Position of the user's pointer along the y axis.
*/
function getVerticalScrollDirection(clientRect, pointerY) {
const { top, bottom, height } = clientRect;
const yThreshold = height * SCROLL_PROXIMITY_THRESHOLD;
if (pointerY >= top - yThreshold && pointerY <= top + yThreshold) {
return 1 /* UP */;
}
else if (pointerY >= bottom - yThreshold && pointerY <= bottom + yThreshold) {
return 2 /* DOWN */;
}
return 0 /* NONE */;
}
/**
* Gets whether the horizontal auto-scroll direction of a node.
* @param clientRect Dimensions of the node.
* @param pointerX Position of the user's pointer along the x axis.
*/
function getHorizontalScrollDirection(clientRect, pointerX) {
const { left, right, width } = clientRect;
const xThreshold = width * SCROLL_PROXIMITY_THRESHOLD;
if (pointerX >= left - xThreshold && pointerX <= left + xThreshold) {
return 1 /* LEFT */;
}
else if (pointerX >= right - xThreshold && pointerX <= right + xThreshold) {
return 2 /* RIGHT */;
}
return 0 /* NONE */;
}
/**
* Gets the directions in which an element node should be scrolled,
* assuming that the user's pointer is already within it scrollable region.
* @param element Element for which we should calculate the scroll direction.
* @param clientRect Bounding client rectangle of the element.
* @param pointerX Position of the user's pointer along the x axis.
* @param pointerY Position of the user's pointer along the y axis.
*/
function getElementScrollDirections(element, clientRect, pointerX, pointerY) {
const computedVertical = getVerticalScrollDirection(clientRect, pointerY);
const computedHorizontal = getHorizontalScrollDirection(clientRect, pointerX);
let verticalScrollDirection = 0 /* NONE */;
let horizontalScrollDirection = 0 /* NONE */;
// Note that we here we do some extra checks for whether the element is actually scrollable in
// a certain direction and we only assign the scroll direction if it is. We do this so that we
// can allow other elements to be scrolled, if the current element can't be scrolled anymore.
// This allows us to handle cases where the scroll regions of two scrollable elements overlap.
if (computedVertical) {
const scrollTop = element.scrollTop;
if (computedVertical === 1 /* UP */) {
if (scrollTop > 0) {
verticalScrollDirection = 1 /* UP */;
}
}
else if (element.scrollHeight - scrollTop > element.clientHeight) {
verticalScrollDirection = 2 /* DOWN */;
}
}
if (computedHorizontal) {
const scrollLeft = element.scrollLeft;
if (computedHorizontal === 1 /* LEFT */) {
if (scrollLeft > 0) {
horizontalScrollDirection = 1 /* LEFT */;
}
}
else if (element.scrollWidth - scrollLeft > element.clientWidth) {
horizontalScrollDirection = 2 /* RIGHT */;
}
}
return [verticalScrollDirection, horizontalScrollDirection];
}
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
/** Event options that can be used to bind an active, capturing event. */
const activeCapturingEventOptions = normalizePassiveListenerOptions({
passive: false,
capture: true
});
/**
* Service that keeps track of all the drag item and drop container
* instances, and manages global event listeners on the `document`.
* @docs-private
*/
// Note: this class is generic, rather than referencing CdkDrag and CdkDropList directly, in order
// to avoid circular imports. If we were to reference them here, importing the registry into the
// classes that are registering themselves will introduce a circular import.
class DragDropRegistry {
constructor(_ngZone, _document) {
this._ngZone = _ngZone;
/** Registered drop container instances. */
this._dropInstances = new Set();
/** Registered drag item instances. */
this._dragInstances = new Set();
/** Drag item instances that are currently being dragged. */
this._activeDragInstances = [];
/** Keeps track of the event listeners that we've bound to the `document`. */
this._globalListeners = new Map();
/**
* Predicate function to check if an item is being dragged. Moved out into a property,
* because it'll be called a lot and we don't want to create a new function every time.
*/
this._draggingPredicate = (item) => item.isDragging();
/**
* Emits the `touchmove` or `mousemove` events that are dispatched
* while the user is dragging a drag item instance.
*/
this.pointerMove = new Subject();
/**
* Emits the `touchend` or `mouseup` events that are dispatched
* while the user is dragging a drag item instance.
*/
this.pointerUp = new Subject();
/** Emits when the viewport has been scrolled while the user is dragging an item. */
this.scroll = new Subject();
/**
* Event listener that will prevent the default browser action while the user is dragging.
* @param event Event whose default action should be prevented.
*/
this._preventDefaultWhileDragging = (event) => {
if (this._activeDragInstances.length > 0) {
event.preventDefault();
}
};
/** Event listener for `touchmove` that is bound even if no dragging is happening. */
this._persistentTouchmoveListener = (event) => {
if (this._activeDragInstances.length > 0) {
// Note that we only want to prevent the default action after dragging has actually started.
// Usually this is the same time at which the item is added to the `_activeDragInstances`,
// but it could be pushed back if the user has set up a drag delay or threshold.
if (this._activeDragInstances.some(this._draggingPredicate)) {
event.preventDefault();
}
this.pointerMove.next(event);
}
};
this._document = _document;
}
/** Adds a drop container to the registry. */
registerDropContainer(drop) {
if (!this._dropInstances.has(drop)) {
this._dropInstances.add(drop);
}
}
/** Adds a drag item instance to the registry. */
registerDragItem(drag) {
this._dragInstances.add(drag);
// The `touchmove` event gets bound once, ahead of time, because WebKit
// won't preventDefault on a dynamically-added `touchmove` listener.
// See https://bugs.webkit.org/show_bug.cgi?id=184250.
if (this._dragInstances.size === 1) {
this._ngZone.runOutsideAngular(() => {
// The event handler has to be explicitly active,
// because newer browsers make it passive by default.
this._document.addEventListener('touchmove', this._persistentTouchmoveListener, activeCapturingEventOptions);
});
}
}
/** Removes a drop container from the registry. */
removeDropContainer(drop) {
this._dropInstances.delete(drop);
}
/** Removes a drag item instance from the registry. */
removeDragItem(drag) {
this._dragInstances.delete(drag);
this.stopDragging(drag);
if (this._dragInstances.size === 0) {
this._document.removeEventListener('touchmove', this._persistentTouchmoveListener, activeCapturingEventOptions);
}
}
/**
* Starts the dragging sequence for a drag instance.
* @param drag Drag instance which is being dragged.
* @param event Event that initiated the dragging.
*/
startDragging(drag, event) {
// Do not process the same drag twice to avoid memory leaks and redundant listeners
if (this._activeDragInstances.indexOf(drag) > -1) {
return;
}
this._activeDragInstances.push(drag);
if (this._activeDragInstances.length === 1) {
const isTouchEvent = event.type.startsWith('touch');
// We explicitly bind __active__ listeners here, because newer browsers will default to
// passive ones for `mousemove` and `touchmove`. The events need to be active, because we
// use `preventDefault` to prevent the page from scrolling while the user is dragging.
this._globalListeners
.set(isTouchEvent ? 'touchend' : 'mouseup', {
handler: (e) => this.pointerUp.next(e),
options: true
})
.set('scroll', {
handler: (e) => this.scroll.next(e),
// Use capturing so that we pick up scroll changes in any scrollable nodes that aren't
// the document. See https://github.com/angular/components/issues/17144.
options: true
})
// Preventing the default action on `mousemove` isn't enough to disable text selection
// on Safari so we need to prevent the selection event as well. Alternatively this can
// be done by setting `user-select: none` on the `body`, however it has causes a style
// recalculation which can be expensive on pages with a lot of elements.
.set('selectstart', {
handler: this._preventDefaultWhileDragging,
options: activeCapturingEventOptions
});
// We don't have to bind a move event for touch drag sequences, because
// we already have a persistent global one bound from `registerDragItem`.
if (!isTouchEvent) {
this._globalListeners.set('mousemove', {
handler: (e) => this.pointerMove.next(e),
options: activeCapturingEventOptions
});
}
this._ngZone.runOutsideAngular(() => {
this._globalListeners.forEach((config, name) => {
this._document.addEventListener(name, config.handler, config.options);
});
});
}
}
/** Stops dragging a drag item instance. */
stopDragging(drag) {
const index = this._activeDragInstances.indexOf(drag);
if (index > -1) {
this._activeDragInstances.splice(index, 1);
if (this._activeDragInstances.length === 0) {
this._clearGlobalListeners();
}
}
}
/** Gets whether a drag item instance is currently being dragged. */
isDragging(drag) {
return this._activeDragInstances.indexOf(drag) > -1;
}
ngOnDestroy() {
this._dragInstances.forEach(instance => this.removeDragItem(instance));
this._dropInstances.forEach(instance => this.removeDropContainer(instance));
this._clearGlobalListeners();
this.pointerMove.complete();
this.pointerUp.complete();
}
/** Clears out the global event listeners from the `document`. */
_clearGlobalListeners() {
this._globalListeners.forEach((config, name) => {
this._document.removeEventListener(name, config.handler, config.options);
});
this._globalListeners.clear();
}
}
DragDropRegistry.ɵprov = ɵɵdefineInjectable({ factory: function DragDropRegistry_Factory() { return new DragDropRegistry(ɵɵinject(NgZone), ɵɵinject(DOCUMENT)); }, token: DragDropRegistry, providedIn: "root" });
DragDropRegistry.decorators = [
{ type: Injectable, args: [{ providedIn: 'root' },] }
];
DragDropRegistry.ctorParameters = () => [
{ type: NgZone },
{ type: undefined, decorators: [{ type: Inject, args: [DOCUMENT,] }] }
];
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
/** Default configuration to be used when creating a `DragRef`. */
const DEFAULT_CONFIG = {
dragStartThreshold: 5,
pointerDirectionChangeThreshold: 5
};
/**
* Service that allows for drag-and-drop functionality to be attached to DOM elements.
*/
class DragDrop {
constructor(_document, _ngZone, _viewportRuler, _dragDropRegistry) {
this._document = _document;
this._ngZone = _ngZone;
this._viewportRuler = _viewportRuler;
this._dragDropRegistry = _dragDropRegistry;
}
/**
* Turns an element into a draggable item.
* @param element Element to which to attach the dragging functionality.
* @param config Object used to configure the dragging behavior.
*/
createDrag(element, config = DEFAULT_CONFIG) {
return new DragRef(element, config, this._document, this._ngZone, this._viewportRuler, this._dragDropRegistry);
}
/**
* Turns an element into a drop list.
* @param element Element to which to attach the drop list functionality.
*/
createDropList(element) {
return new DropListRef(element, this._dragDropRegistry, this._document, this._ngZone, this._viewportRuler);
}
}
DragDrop.ɵprov = ɵɵdefineInjectable({ factory: function DragDrop_Factory() { return new DragDrop(ɵɵinject(DOCUMENT), ɵɵinject(NgZone), ɵɵinject(ViewportRuler), ɵɵinject(DragDropRegistry)); }, token: DragDrop, providedIn: "root" });
DragDrop.decorators = [
{ type: Injectable, args: [{ providedIn: 'root' },] }
];
DragDrop.ctorParameters = () => [
{ type: undefined, decorators: [{ type: Inject, args: [DOCUMENT,] }] },
{ type: NgZone },
{ type: ViewportRuler },
{ type: DragDropRegistry }
];
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
/**
* Injection token that can be used for a `CdkDrag` to provide itself as a parent to the
* drag-specific child directive (`CdkDragHandle`, `CdkDragPreview` etc.). Used primarily
* to avoid circular imports.
* @docs-private
*/
const CDK_DRAG_PARENT = new InjectionToken('CDK_DRAG_PARENT');
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
/**
* Injection token that can be used to reference instances of `CdkDropListGroup`. It serves as
* alternative token to the actual `CdkDropListGroup` class which could cause unnecessary
* retention of the class and its directive metadata.
*/
const CDK_DROP_LIST_GROUP = new InjectionToken('CdkDropListGroup');
/**
* Declaratively connects sibling `cdkDropList` instances together. All of the `cdkDropList`
* elements that are placed inside a `cdkDropListGroup` will be connected to each other
* automatically. Can be used as an alternative to the `cdkDropListConnectedTo` input
* from `cdkDropList`.
*/
class CdkDropListGroup {
constructor() {
/** Drop lists registered inside the group. */
this._items = new Set();
this._disabled = false;
}
/** Whether starting a dragging sequence from inside this group is disabled. */
get disabled() { return this._disabled; }
set disabled(value) {
this._disabled = coerceBooleanProperty(value);
}
ngOnDestroy() {
this._items.clear();
}
}
CdkDropListGroup.decorators = [
{ type: Directive, args: [{
selector: '[cdkDropListGroup]',
exportAs: 'cdkDropListGroup',
providers: [{ provide: CDK_DROP_LIST_GROUP, useExisting: CdkDropListGroup }],
},] }
];
CdkDropListGroup.propDecorators = {
disabled: [{ type: Input, args: ['cdkDropListGroupDisabled',] }]
};
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
/**
* Injection token that can be used to configure the
* behavior of the drag&drop-related components.
*/
const CDK_DRAG_CONFIG = new InjectionToken('CDK_DRAG_CONFIG');
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
/**
* Asserts that a particular node is an element.
* @param node Node to be checked.
* @param name Name to attach to the error message.
*/
function assertElementNode(node, name) {
if (node.nodeType !== 1) {
throw Error(`${name} must be attached to an element node. ` +
`Currently attached to "${node.nodeName}".`);
}
}
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
/** Counter used to generate unique ids for drop zones. */
let _uniqueIdCounter = 0;
/**
* Injection token that can be used to reference instances of `CdkDropList`. It serves as
* alternative token to the actual `CdkDropList` class which could cause unnecessary
* retention of the class and its directive metadata.
*/
const CDK_DROP_LIST = new InjectionToken('CdkDropList');
const ɵ0 = undefined;
/** Container that wraps a set of draggable items. */
class CdkDropList {
constructor(
/** Element that the drop list is attached to. */
element, dragDrop, _changeDetectorRef, _scrollDispatcher, _dir, _group, config) {
this.element = element;
this._changeDetectorRef = _changeDetectorRef;
this._scrollDispatcher = _scrollDispatcher;
this._dir = _dir;
this._group = _group;
/** Emits when the list has been destroyed. */
this._destroyed = new Subject();
/**
* Other draggable containers that this container is connected to and into which the
* container's items can be transferred. Can either be references to other drop containers,
* or their unique IDs.
*/
this.connectedTo = [];
/**
* Unique ID for the drop zone. Can be used as a reference
* in the `connectedTo` of another `CdkDropList`.
*/
this.id = `cdk-drop-list-${_uniqueIdCounter++}`;
/**
* Function that is used to determine whether an item
* is allowed to be moved into a drop container.
*/
this.enterPredicate = () => true;
/** Functions that is used to determine whether an item can be sorted into a particular index. */
this.sortPredicate = () => true;
/** Emits when the user drops an item inside the container. */
this.dropped = new EventEmitter();
/**
* Emits when the user has moved a new drag item into this container.
*/
this.entered = new EventEmitter();
/**
* Emits when the user removes an item from the container
* by dragging it into another container.
*/
this.exited = new EventEmitter();
/** Emits as the user is swapping items while actively dragging. */
this.sorted = new EventEmitter();
/**
* Keeps track of the items that are registered with this container. Historically we used to
* do this with a `ContentChildren` query, however queries don't handle transplanted views very
* well which means that we can't handle cases like dragging the headers of a `mat-table`
* correctly. What we do instead is to have the items register themselves with the container
* and then we sort them based on their position in the DOM.
*/
this._unsortedItems = new Set();
if (typeof ngDevMode === 'undefined' || ngDevMode) {
assertElementNode(element.nativeElement, 'cdkDropList');
}
this._dropListRef = dragDrop.createDropList(element);
this._dropListRef.data = this;
if (config) {
this._assignDefaults(config);
}
this._dropListRef.enterPredicate = (drag, drop) => {
return this.enterPredicate(drag.data, drop.data);
};
this._dropListRef.sortPredicate =
(index, drag, drop) => {
return this.sortPredicate(index, drag.data, drop.data);
};
this._setupInputSyncSubscription(this._dropListRef);
this._handleEvents(this._dropListRef);
CdkDropList._dropLists.push(this);
if (_group) {
_group._items.add(this);
}
}
/** Whether starting a dragging sequence from this container is disabled. */
get disabled() {
return this._disabled || (!!this._group && this._group.disabled);
}
set disabled(value) {
// Usually we sync the directive and ref state right before dragging starts, in order to have
// a single point of failure and to avoid having to use setters for everything. `disabled` is
// a special case, because it can prevent the `beforeStarted` event from firing, which can lock
// the user in a disabled state, so we also need to sync it as it's being set.
this._dropListRef.disabled = this._disabled = coerceBooleanProperty(value);
}
/** Registers an items with the drop list. */
addItem(item) {
this._unsortedItems.add(item);
if (this._dropListRef.isDragging()) {
this._syncItemsWithRef();
}
}
/** Removes an item from the drop list. */
removeItem(item) {
this._unsortedItems.delete(item);
if (this._dropListRef.isDragging()) {
this._syncItemsWithRef();
}
}
/** Gets the registered items in the list, sorted by their position in the DOM. */
getSortedItems() {
return Array.from(this._unsortedItems).sort((a, b) => {
const documentPosition = a._dragRef.getVisibleElement().compareDocumentPosition(b._dragRef.getVisibleElement());
// `compareDocumentPosition` returns a bitmask so we have to use a bitwise operator.
// https://developer.mozilla.org/en-US/docs/Web/API/Node/compareDocumentPosition
// tslint:disable-next-line:no-bitwise
return documentPosition & Node.DOCUMENT_POSITION_FOLLOWING ? -1 : 1;
});
}
ngOnDestroy() {
const index = CdkDropList._dropLists.indexOf(this);
if (index > -1) {
CdkDropList._dropLists.splice(index, 1);
}
if (this._group) {
this._group._items.delete(this);
}
this._unsortedItems.clear();
this._dropListRef.dispose();
this._destroyed.next();
this._destroyed.complete();
}
/** Syncs the inputs of the CdkDropList with the options of the underlying DropListRef. */
_setupInputSyncSubscription(ref) {
if (this._dir) {
this._dir.change
.pipe(startWith(this._dir.value), takeUntil(this._destroyed))
.subscribe(value => ref.withDirection(value));
}
ref.beforeStarted.subscribe(() => {
const siblings = coerceArray(this.connectedTo).map(drop => {
if (typeof drop === 'string') {
const correspondingDropList = CdkDropList._dropLists.find(list => list.id === drop);
if (!correspondingDropList && (typeof ngDevMode === 'undefined' || ngDevMode)) {
console.warn(`CdkDropList could not find connected drop list with id "${drop}"`);
}
return correspondingDropList;
}
return drop;
});
if (this._group) {
this._group._items.forEach(drop => {
if (siblings.indexOf(drop) === -1) {
siblings.push(drop);
}
});
}
// Note that we resolve the scrollable parents here so that we delay the resolution
// as long as possible, ensuring that the element is in its final place in the DOM.
if (!this._scrollableParentsResolved) {
const scrollableParents = this._scrollDispatcher
.getAncestorScrollContainers(this.element)
.map(scrollable => scrollable.getElementRef().nativeElement);
this._dropListRef.withScrollableParents(scrollableParents);
// Only do this once since it involves traversing the DOM and the parents
// shouldn't be able to change without the drop list being destroyed.
this._scrollableParentsResolved = true;
}
ref.disabled = this.disabled;
ref.lockAxis = this.lockAxis;
ref.sortingDisabled = coerceBooleanProperty(this.sortingDisabled);
ref.autoScrollDisabled = coerceBooleanProperty(this.autoScrollDisabled);
ref.autoScrollStep = coerceNumberProperty(this.autoScrollStep, 2);
ref
.connectedTo(siblings.filter(drop => drop && drop !== this).map(list => list._dropListRef))
.withOrientation(this.orientation);
});
}
/** Handles events from the underlying DropListRef. */
_handleEvents(ref) {
ref.beforeStarted.subscribe(() => {
this._syncItemsWithRef();
this._changeDetectorRef.markForCheck();
});
ref.entered.subscribe(event => {
this.entered.emit({
container: this,
item: event.item.data,
currentIndex: event.currentIndex
});
});
ref.exited.subscribe(event => {
this.exited.emit({
container: this,
item: event.item.data
});
this._changeDetectorRef.markForCheck();
});
ref.sorted.subscribe(event => {
this.sorted.emit({
previousIndex: event.previousIndex,
currentIndex: event.currentIndex,
container: this,
item: event.item.data
});
});
ref.dropped.subscribe(event => {
this.dropped.emit({
previousIndex: event.previousIndex,
currentIndex: event.currentIndex,
previousContainer: event.previousContainer.data,
container: event.container.data,
item: event.item.data,
isPointerOverContainer: event.isPointerOverContainer,
distance: event.distance
});
// Mark for check since all of these events run outside of change
// detection and we're not guaranteed for something else to have triggered it.
this._changeDetectorRef.markForCheck();
});
}
/** Assigns the default input values based on a provided config object. */
_assignDefaults(config) {
const { lockAxis, draggingDisabled, sortingDisabled, listAutoScrollDisabled, listOrientation } = config;
this.disabled = draggingDisabled == null ? false : draggingDisabled;
this.sortingDisabled = sortingDisabled == null ? false : sortingDisabled;
this.autoScrollDisabled = listAutoScrollDisabled == null ? false : listAutoScrollDisabled;
this.orientation = listOrientation || 'vertical';
if (lockAxis) {
this.lockAxis = lockAxis;
}
}
/** Syncs up the registered drag items with underlying drop list ref. */
_syncItemsWithRef() {
this._dropListRef.withItems(this.getSortedItems().map(item => item._dragRef));
}
}
/** Keeps track of the drop lists that are currently on the page. */
CdkDropList._dropLists = [];
CdkDropList.decorators = [
{ type: Directive, args: [{
selector: '[cdkDropList], cdk-drop-list',
exportAs: 'cdkDropList',
providers: [
// Prevent child drop lists from picking up the same group as their parent.
{ provide: CDK_DROP_LIST_GROUP, useValue: ɵ0 },
{ provide: CDK_DROP_LIST, useExisting: CdkDropList },
],
host: {
'class': 'cdk-drop-list',
'[attr.id]': 'id',
'[class.cdk-drop-list-disabled]': 'disabled',
'[class.cdk-drop-list-dragging]': '_dropListRef.isDragging()',
'[class.cdk-drop-list-receiving]': '_dropListRef.isReceiving()',
}
},] }
];
CdkDropList.ctorParameters = () => [
{ type: ElementRef },
{ type: DragDrop },
{ type: ChangeDetectorRef },
{ type: ScrollDispatcher },
{ type: Directionality, decorators: [{ type: Optional }] },
{ type: CdkDropListGroup, decorators: [{ type: Optional }, { type: Inject, args: [CDK_DROP_LIST_GROUP,] }, { type: SkipSelf }] },
{ type: undefined, decorators: [{ type: Optional }, { type: Inject, args: [CDK_DRAG_CONFIG,] }] }
];
CdkDropList.propDecorators = {
connectedTo: [{ type: Input, args: ['cdkDropListConnectedTo',] }],
data: [{ type: Input, args: ['cdkDropListData',] }],
orientation: [{ type: Input, args: ['cdkDropListOrientation',] }],
id: [{ type: Input }],
lockAxis: [{ type: Input, args: ['cdkDropListLockAxis',] }],
disabled: [{ type: Input, args: ['cdkDropListDisabled',] }],
sortingDisabled: [{ type: Input, args: ['cdkDropListSortingDisabled',] }],
enterPredicate: [{ type: Input, args: ['cdkDropListEnterPredicate',] }],
sortPredicate: [{ type: Input, args: ['cdkDropListSortPredicate',] }],
autoScrollDisabled: [{ type: Input, args: ['cdkDropListAutoScrollDisabled',] }],
autoScrollStep: [{ type: Input, args: ['cdkDropListAutoScrollStep',] }],
dropped: [{ type: Output, args: ['cdkDropListDropped',] }],
entered: [{ type: Output, args: ['cdkDropListEntered',] }],
exited: [{ type: Output, args: ['cdkDropListExited',] }],
sorted: [{ type: Output, args: ['cdkDropListSorted',] }]
};
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
/**
* Injection token that can be used to reference instances of `CdkDragHandle`. It serves as
* alternative token to the actual `CdkDragHandle` class which could cause unnecessary
* retention of the class and its directive metadata.
*/
const CDK_DRAG_HANDLE = new InjectionToken('CdkDragHandle');
/** Handle that can be used to drag a CdkDrag instance. */
class CdkDragHandle {
constructor(element, parentDrag) {
this.element = element;
/** Emits when the state of the handle has changed. */
this._stateChanges = new Subject();
this._disabled = false;
if (typeof ngDevMode === 'undefined' || ngDevMode) {
assertElementNode(element.nativeElement, 'cdkDragHandle');
}
this._parentDrag = parentDrag;
}
/** Whether starting to drag through this handle is disabled. */
get disabled() { return this._disabled; }
set disabled(value) {
this._disabled = coerceBooleanProperty(value);
this._stateChanges.next(this);
}
ngOnDestroy() {
this._stateChanges.complete();
}
}
CdkDragHandle.decorators = [
{ type: Directive, args: [{
selector: '[cdkDragHandle]',
host: {
'class': 'cdk-drag-handle'
},
providers: [{ provide: CDK_DRAG_HANDLE, useExisting: CdkDragHandle }],
},] }
];
CdkDragHandle.ctorParameters = () => [
{ type: ElementRef },
{ type: undefined, decorators: [{ type: Inject, args: [CDK_DRAG_PARENT,] }, { type: Optional }, { type: SkipSelf }] }
];
CdkDragHandle.propDecorators = {
disabled: [{ type: Input, args: ['cdkDragHandleDisabled',] }]
};
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
/**
* Injection token that can be used to reference instances of `CdkDragPlaceholder`. It serves as
* alternative token to the actual `CdkDragPlaceholder` class which could cause unnecessary
* retention of the class and its directive metadata.
*/
const CDK_DRAG_PLACEHOLDER = new InjectionToken('CdkDragPlaceholder');
/**
* Element that will be used as a template for the placeholder of a CdkDrag when
* it is being dragged. The placeholder is displayed in place of the element being dragged.
*/
class CdkDragPlaceholder {
constructor(templateRef) {
this.templateRef = templateRef;
}
}
CdkDragPlaceholder.decorators = [
{ type: Directive, args: [{
selector: 'ng-template[cdkDragPlaceholder]',
providers: [{ provide: CDK_DRAG_PLACEHOLDER, useExisting: CdkDragPlaceholder }],
},] }
];
CdkDragPlaceholder.ctorParameters = () => [
{ type: TemplateRef }
];
CdkDragPlaceholder.propDecorators = {
data: [{ type: Input }]
};
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
/**
* Injection token that can be used to reference instances of `CdkDragPreview`. It serves as
* alternative token to the actual `CdkDragPreview` class which could cause unnecessary
* retention of the class and its directive metadata.
*/
const CDK_DRAG_PREVIEW = new InjectionToken('CdkDragPreview');
/**
* Element that will be used as a template for the preview
* of a CdkDrag when it is being dragged.
*/
class CdkDragPreview {
constructor(templateRef) {
this.templateRef = templateRef;
this._matchSize = false;
}
/** Whether the preview should preserve the same size as the item that is being dragged. */
get matchSize() { return this._matchSize; }
set matchSize(value) { this._matchSize = coerceBooleanProperty(value); }
}
CdkDragPreview.decorators = [
{ type: Directive, args: [{
selector: 'ng-template[cdkDragPreview]',
providers: [{ provide: CDK_DRAG_PREVIEW, useExisting: CdkDragPreview }],
},] }
];
CdkDragPreview.ctorParameters = () => [
{ type: TemplateRef }
];
CdkDragPreview.propDecorators = {
data: [{ type: Input }],
matchSize: [{ type: Input }]
};
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
const DRAG_HOST_CLASS = 'cdk-drag';
/** Element that can be moved inside a CdkDropList container. */
class CdkDrag {
constructor(
/** Element that the draggable is attached to. */
element,
/** Droppable container that the draggable is a part of. */
dropContainer,
/**
* @deprecated `_document` parameter no longer being used and will be removed.
* @breaking-change 12.0.0
*/
_document, _ngZone, _viewContainerRef, config, _dir, dragDrop, _changeDetectorRef, _selfHandle, _parentDrag) {
this.element = element;
this.dropContainer = dropContainer;
this._ngZone = _ngZone;
this._viewContainerRef = _viewContainerRef;
this._dir = _dir;
this._changeDetectorRef = _changeDetectorRef;
this._selfHandle = _selfHandle;
this._parentDrag = _parentDrag;
this._destroyed = new Subject();
/** Emits when the user starts dragging the item. */
this.started = new EventEmitter();
/** Emits when the user has released a drag item, before any animations have started. */
this.released = new EventEmitter();
/** Emits when the user stops dragging an item in the container. */
this.ended = new EventEmitter();
/** Emits when the user has moved the item into a new container. */
this.entered = new EventEmitter();
/** Emits when the user removes the item its container by dragging it into another container. */
this.exited = new EventEmitter();
/** Emits when the user drops the item inside a container. */
this.dropped = new EventEmitter();
/**
* Emits as the user is dragging the item. Use with caution,
* because this event will fire for every pixel that the user has dragged.
*/
this.moved = new Observable((observer) => {
const subscription = this._dragRef.moved.pipe(map(movedEvent => ({
source: this,
pointerPosition: movedEvent.pointerPosition,
event: movedEvent.event,
delta: movedEvent.delta,
distance: movedEvent.distance
}))).subscribe(observer);
return () => {
subscription.unsubscribe();
};
});
this._dragRef = dragDrop.createDrag(element, {
dragStartThreshold: config && config.dragStartThreshold != null ?
config.dragStartThreshold : 5,
pointerDirectionChangeThreshold: config && config.pointerDirectionChangeThreshold != null ?
config.pointerDirectionChangeThreshold : 5,
zIndex: config === null || config === void 0 ? void 0 : config.zIndex,
});
this._dragRef.data = this;
// We have to keep track of the drag instances in order to be able to match an element to
// a drag instance. We can't go through the global registry of `DragRef`, because the root
// element could be different.
CdkDrag._dragInstances.push(this);
if (config) {
this._assignDefaults(config);
}
// Note that usually the container is assigned when the drop list is picks up the item, but in
// some cases (mainly transplanted views with OnPush, see #18341) we may end up in a situation
// where there are no items on the first change detection pass, but the items get picked up as
// soon as the user triggers another pass by dragging. This is a problem, because the item would
// have to switch from standalone mode to drag mode in the middle of the dragging sequence which
// is too late since the two modes save different kinds of information. We work around it by
// assigning the drop container both from here and the list.
if (dropContainer) {
this._dragRef._withDropContainer(dropContainer._dropListRef);
dropContainer.addItem(this);
}
this._syncInputs(this._dragRef);
this._handleEvents(this._dragRef);
}
/** Whether starting to drag this element is disabled. */
get disabled() {
return this._disabled || (this.dropContainer && this.dropContainer.disabled);
}
set disabled(value) {
this._disabled = coerceBooleanProperty(value);
this._dragRef.disabled = this._disabled;
}
/**
* Returns the element that is being used as a placeholder
* while the current element is being dragged.
*/
getPlaceholderElement() {
return this._dragRef.getPlaceholderElement();
}
/** Returns the root draggable element. */
getRootElement() {
return this._dragRef.getRootElement();
}
/** Resets a standalone drag item to its initial position. */
reset() {
this._dragRef.reset();
}
/**
* Gets the pixel coordinates of the draggable outside of a drop container.
*/
getFreeDragPosition() {
return this._dragRef.getFreeDragPosition();
}
ngAfterViewInit() {
// We need to wait for the zone to stabilize, in order for the reference
// element to be in the proper place in the DOM. This is mostly relevant
// for draggable elements inside portals since they get stamped out in
// their original DOM position and then they get transferred to the portal.
this._ngZone.onStable
.pipe(take(1), takeUntil(this._destroyed))
.subscribe(() => {
this._updateRootElement();
// Listen for any newly-added handles.
this._handles.changes.pipe(startWith(this._handles),
// Sync the new handles with the DragRef.
tap((handles) => {
const childHandleElements = handles
.filter(handle => handle._parentDrag === this)
.map(handle => handle.element);
// Usually handles are only allowed to be a descendant of the drag element, but if
// the consumer defined a different drag root, we should allow the drag element
// itself to be a handle too.
if (this._selfHandle && this.rootElementSelector) {
childHandleElements.push(this.element);
}
this._dragRef.withHandles(childHandleElements);
}),
// Listen if the state of any of the handles changes.
switchMap((handles) => {
return merge(...handles.map(item => {
return item._stateChanges.pipe(startWith(item));
}));
}), takeUntil(this._destroyed)).subscribe(handleInstance => {
// Enabled/disable the handle that changed in the DragRef.
const dragRef = this._dragRef;
const handle = handleInstance.element.nativeElement;
handleInstance.disabled ? dragRef.disableHandle(handle) : dragRef.enableHandle(handle);
});
if (this.freeDragPosition) {
this._dragRef.setFreeDragPosition(this.freeDragPosition);
}
});
}
ngOnChanges(changes) {
const rootSelectorChange = changes['rootElementSelector'];
const positionChange = changes['freeDragPosition'];
// We don't have to react to the first change since it's being
// handled in `ngAfterViewInit` where it needs to be deferred.
if (rootSelectorChange && !rootSelectorChange.firstChange) {
this._updateRootElement();
}
// Skip the first change since it's being handled in `ngAfterViewInit`.
if (positionChange && !positionChange.firstChange && this.freeDragPosition) {
this._dragRef.setFreeDragPosition(this.freeDragPosition);
}
}
ngOnDestroy() {
if (this.dropContainer) {
this.dropContainer.removeItem(this);
}
const index = CdkDrag._dragInstances.indexOf(this);
if (index > -1) {
CdkDrag._dragInstances.splice(index, 1);
}
this._destroyed.next();
this._destroyed.complete();
this._dragRef.dispose();
}
/** Syncs the root element with the `DragRef`. */
_updateRootElement() {
const element = this.element.nativeElement;
const rootElement = this.rootElementSelector ?
getClosestMatchingAncestor(element, this.rootElementSelector) : element;
if (rootElement && (typeof ngDevMode === 'undefined' || ngDevMode)) {
assertElementNode(rootElement, 'cdkDrag');
}
this._dragRef.withRootElement(rootElement || element);
}
/** Gets the boundary element, based on the `boundaryElement` value. */
_getBoundaryElement() {
const boundary = this.boundaryElement;
if (!boundary) {
return null;
}
if (typeof boundary === 'string') {
return getClosestMatchingAncestor(this.element.nativeElement, boundary);
}
const element = coerceElement(boundary);
if ((typeof ngDevMode === 'undefined' || ngDevMode) &&
!element.contains(this.element.nativeElement)) {
throw Error('Draggable element is not inside of the node passed into cdkDragBoundary.');
}
return element;
}
/** Syncs the inputs of the CdkDrag with the options of the underlying DragRef. */
_syncInputs(ref) {
ref.beforeStarted.subscribe(() => {
if (!ref.isDragging()) {
const dir = this._dir;
const dragStartDelay = this.dragStartDelay;
const placeholder = this._placeholderTemplate ? {
template: this._placeholderTemplate.templateRef,
context: this._placeholderTemplate.data,
viewContainer: this._viewContainerRef
} : null;
const preview = this._previewTemplate ? {
template: this._previewTemplate.templateRef,
context: this._previewTemplate.data,
matchSize: this._previewTemplate.matchSize,
viewContainer: this._viewContainerRef
} : null;
ref.disabled = this.disabled;
ref.lockAxis = this.lockAxis;
ref.dragStartDelay = (typeof dragStartDelay === 'object' && dragStartDelay) ?
dragStartDelay : coerceNumberProperty(dragStartDelay);
ref.constrainPosition = this.constrainPosition;
ref.previewClass = this.previewClass;
ref
.withBoundaryElement(this._getBoundaryElement())
.withPlaceholderTemplate(placeholder)
.withPreviewTemplate(preview);
if (dir) {
ref.withDirection(dir.value);
}
}
});
// This only needs to be resolved once.
ref.beforeStarted.pipe(take(1)).subscribe(() => {
var _a, _b;
// If we managed to resolve a parent through DI, use it.
if (this._parentDrag) {
ref.withParent(this._parentDrag._dragRef);
return;
}
// Otherwise fall back to resolving the parent by looking up the DOM. This can happen if
// the item was projected into another item by something like `ngTemplateOutlet`.
let parent = this.element.nativeElement.parentElement;
while (parent) {
// `classList` needs to be null checked, because IE doesn't have it on some elements.
if ((_a = parent.classList) === null || _a === void 0 ? void 0 : _a.contains(DRAG_HOST_CLASS)) {
ref.withParent(((_b = CdkDrag._dragInstances.find(drag => {
return drag.element.nativeElement === parent;
})) === null || _b === void 0 ? void 0 : _b._dragRef) || null);
break;
}
parent = parent.parentElement;
}
});
}
/** Handles the events from the underlying `DragRef`. */
_handleEvents(ref) {
ref.started.subscribe(() => {
this.started.emit({ source: this });
// Since all of these events run outside of change detection,
// we need to ensure that everything is marked correctly.
this._changeDetectorRef.markForCheck();
});
ref.released.subscribe(() => {
this.released.emit({ source: this });
});
ref.ended.subscribe(event => {
this.ended.emit({ source: this, distance: event.distance });
// Since all of these events run outside of change detection,
// we need to ensure that everything is marked correctly.
this._changeDetectorRef.markForCheck();
});
ref.entered.subscribe(event => {
this.entered.emit({
container: event.container.data,
item: this,
currentIndex: event.currentIndex
});
});
ref.exited.subscribe(event => {
this.exited.emit({
container: event.container.data,
item: this
});
});
ref.dropped.subscribe(event => {
this.dropped.emit({
previousIndex: event.previousIndex,
currentIndex: event.currentIndex,
previousContainer: event.previousContainer.data,
container: event.container.data,
isPointerOverContainer: event.isPointerOverContainer,
item: this,
distance: event.distance
});
});
}
/** Assigns the default input values based on a provided config object. */
_assignDefaults(config) {
const { lockAxis, dragStartDelay, constrainPosition, previewClass, boundaryElement, draggingDisabled, rootElementSelector } = config;
this.disabled = draggingDisabled == null ? false : draggingDisabled;
this.dragStartDelay = dragStartDelay || 0;
if (lockAxis) {
this.lockAxis = lockAxis;
}
if (constrainPosition) {
this.constrainPosition = constrainPosition;
}
if (previewClass) {
this.previewClass = previewClass;
}
if (boundaryElement) {
this.boundaryElement = boundaryElement;
}
if (rootElementSelector) {
this.rootElementSelector = rootElementSelector;
}
}
}
CdkDrag._dragInstances = [];
CdkDrag.decorators = [
{ type: Directive, args: [{
selector: '[cdkDrag]',
exportAs: 'cdkDrag',
host: {
'class': DRAG_HOST_CLASS,
'[class.cdk-drag-disabled]': 'disabled',
'[class.cdk-drag-dragging]': '_dragRef.isDragging()',
},
providers: [{ provide: CDK_DRAG_PARENT, useExisting: CdkDrag }]
},] }
];
CdkDrag.ctorParameters = () => [
{ type: ElementRef },
{ type: undefined, decorators: [{ type: Inject, args: [CDK_DROP_LIST,] }, { type: Optional }, { type: SkipSelf }] },
{ type: undefined, decorators: [{ type: Inject, args: [DOCUMENT,] }] },
{ type: NgZone },
{ type: ViewContainerRef },
{ type: undefined, decorators: [{ type: Optional }, { type: Inject, args: [CDK_DRAG_CONFIG,] }] },
{ type: Directionality, decorators: [{ type: Optional }] },
{ type: DragDrop },
{ type: ChangeDetectorRef },
{ type: CdkDragHandle, decorators: [{ type: Optional }, { type: Self }, { type: Inject, args: [CDK_DRAG_HANDLE,] }] },
{ type: CdkDrag, decorators: [{ type: Optional }, { type: SkipSelf }, { type: Inject, args: [CDK_DRAG_PARENT,] }] }
];
CdkDrag.propDecorators = {
_handles: [{ type: ContentChildren, args: [CDK_DRAG_HANDLE, { descendants: true },] }],
_previewTemplate: [{ type: ContentChild, args: [CDK_DRAG_PREVIEW,] }],
_placeholderTemplate: [{ type: ContentChild, args: [CDK_DRAG_PLACEHOLDER,] }],
data: [{ type: Input, args: ['cdkDragData',] }],
lockAxis: [{ type: Input, args: ['cdkDragLockAxis',] }],
rootElementSelector: [{ type: Input, args: ['cdkDragRootElement',] }],
boundaryElement: [{ type: Input, args: ['cdkDragBoundary',] }],
dragStartDelay: [{ type: Input, args: ['cdkDragStartDelay',] }],
freeDragPosition: [{ type: Input, args: ['cdkDragFreeDragPosition',] }],
disabled: [{ type: Input, args: ['cdkDragDisabled',] }],
constrainPosition: [{ type: Input, args: ['cdkDragConstrainPosition',] }],
previewClass: [{ type: Input, args: ['cdkDragPreviewClass',] }],
started: [{ type: Output, args: ['cdkDragStarted',] }],
released: [{ type: Output, args: ['cdkDragReleased',] }],
ended: [{ type: Output, args: ['cdkDragEnded',] }],
entered: [{ type: Output, args: ['cdkDragEntered',] }],
exited: [{ type: Output, args: ['cdkDragExited',] }],
dropped: [{ type: Output, args: ['cdkDragDropped',] }],
moved: [{ type: Output, args: ['cdkDragMoved',] }]
};
/** Gets the closest ancestor of an element that matches a selector. */
function getClosestMatchingAncestor(element, selector) {
let currentElement = element.parentElement;
while (currentElement) {
// IE doesn't support `matches` so we have to fall back to `msMatchesSelector`.
if (currentElement.matches ? currentElement.matches(selector) :
currentElement.msMatchesSelector(selector)) {
return currentElement;
}
currentElement = currentElement.parentElement;
}
return null;
}
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
class DragDropModule {
}
DragDropModule.decorators = [
{ type: NgModule, args: [{
declarations: [
CdkDropList,
CdkDropListGroup,
CdkDrag,
CdkDragHandle,
CdkDragPreview,
CdkDragPlaceholder,
],
exports: [
CdkScrollableModule,
CdkDropList,
CdkDropListGroup,
CdkDrag,
CdkDragHandle,
CdkDragPreview,
CdkDragPlaceholder,
],
providers: [
DragDrop,
]
},] }
];
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
/**
* Generated bundle index. Do not edit.
*/
export { CDK_DRAG_CONFIG, CDK_DRAG_HANDLE, CDK_DRAG_PARENT, CDK_DRAG_PLACEHOLDER, CDK_DRAG_PREVIEW, CDK_DROP_LIST, CDK_DROP_LIST_GROUP, CdkDrag, CdkDragHandle, CdkDragPlaceholder, CdkDragPreview, CdkDropList, CdkDropListGroup, DragDrop, DragDropModule, DragDropRegistry, DragRef, DropListRef, copyArrayItem, moveItemInArray, transferArrayItem };
//# sourceMappingURL=drag-drop.js.map