| // Copyright 2006 The Closure Library Authors. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS-IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| /** |
| * @fileoverview Common positioning code. |
| * |
| * @author eae@google.com (Emil A Eklund) |
| */ |
| |
| goog.provide('goog.positioning'); |
| goog.provide('goog.positioning.Corner'); |
| goog.provide('goog.positioning.CornerBit'); |
| goog.provide('goog.positioning.Overflow'); |
| goog.provide('goog.positioning.OverflowStatus'); |
| |
| goog.require('goog.asserts'); |
| goog.require('goog.dom'); |
| goog.require('goog.dom.TagName'); |
| goog.require('goog.math.Coordinate'); |
| goog.require('goog.math.Rect'); |
| goog.require('goog.math.Size'); |
| goog.require('goog.style'); |
| goog.require('goog.style.bidi'); |
| |
| |
| /** |
| * Enum for representing an element corner for positioning the popup. |
| * |
| * The START constants map to LEFT if element directionality is left |
| * to right and RIGHT if the directionality is right to left. |
| * Likewise END maps to RIGHT or LEFT depending on the directionality. |
| * |
| * @enum {number} |
| */ |
| goog.positioning.Corner = { |
| TOP_LEFT: 0, |
| TOP_RIGHT: 2, |
| BOTTOM_LEFT: 1, |
| BOTTOM_RIGHT: 3, |
| TOP_START: 4, |
| TOP_END: 6, |
| BOTTOM_START: 5, |
| BOTTOM_END: 7 |
| }; |
| |
| |
| /** |
| * Enum for bits in the {@see goog.positioning.Corner) bitmap. |
| * |
| * @enum {number} |
| */ |
| goog.positioning.CornerBit = { |
| BOTTOM: 1, |
| RIGHT: 2, |
| FLIP_RTL: 4 |
| }; |
| |
| |
| /** |
| * Enum for representing position handling in cases where the element would be |
| * positioned outside the viewport. |
| * |
| * @enum {number} |
| */ |
| goog.positioning.Overflow = { |
| /** Ignore overflow */ |
| IGNORE: 0, |
| |
| /** Try to fit horizontally in the viewport at all costs. */ |
| ADJUST_X: 1, |
| |
| /** If the element can't fit horizontally, report positioning failure. */ |
| FAIL_X: 2, |
| |
| /** Try to fit vertically in the viewport at all costs. */ |
| ADJUST_Y: 4, |
| |
| /** If the element can't fit vertically, report positioning failure. */ |
| FAIL_Y: 8, |
| |
| /** Resize the element's width to fit in the viewport. */ |
| RESIZE_WIDTH: 16, |
| |
| /** Resize the element's height to fit in the viewport. */ |
| RESIZE_HEIGHT: 32, |
| |
| /** |
| * If the anchor goes off-screen in the x-direction, position the movable |
| * element off-screen. Otherwise, try to fit horizontally in the viewport. |
| */ |
| ADJUST_X_EXCEPT_OFFSCREEN: 64 | 1, |
| |
| /** |
| * If the anchor goes off-screen in the y-direction, position the movable |
| * element off-screen. Otherwise, try to fit vertically in the viewport. |
| */ |
| ADJUST_Y_EXCEPT_OFFSCREEN: 128 | 4 |
| }; |
| |
| |
| /** |
| * Enum for representing the outcome of a positioning call. |
| * |
| * @enum {number} |
| */ |
| goog.positioning.OverflowStatus = { |
| NONE: 0, |
| ADJUSTED_X: 1, |
| ADJUSTED_Y: 2, |
| WIDTH_ADJUSTED: 4, |
| HEIGHT_ADJUSTED: 8, |
| FAILED_LEFT: 16, |
| FAILED_RIGHT: 32, |
| FAILED_TOP: 64, |
| FAILED_BOTTOM: 128, |
| FAILED_OUTSIDE_VIEWPORT: 256 |
| }; |
| |
| |
| /** |
| * Shorthand to check if a status code contains any fail code. |
| * @type {number} |
| */ |
| goog.positioning.OverflowStatus.FAILED = |
| goog.positioning.OverflowStatus.FAILED_LEFT | |
| goog.positioning.OverflowStatus.FAILED_RIGHT | |
| goog.positioning.OverflowStatus.FAILED_TOP | |
| goog.positioning.OverflowStatus.FAILED_BOTTOM | |
| goog.positioning.OverflowStatus.FAILED_OUTSIDE_VIEWPORT; |
| |
| |
| /** |
| * Shorthand to check if horizontal positioning failed. |
| * @type {number} |
| */ |
| goog.positioning.OverflowStatus.FAILED_HORIZONTAL = |
| goog.positioning.OverflowStatus.FAILED_LEFT | |
| goog.positioning.OverflowStatus.FAILED_RIGHT; |
| |
| |
| /** |
| * Shorthand to check if vertical positioning failed. |
| * @type {number} |
| */ |
| goog.positioning.OverflowStatus.FAILED_VERTICAL = |
| goog.positioning.OverflowStatus.FAILED_TOP | |
| goog.positioning.OverflowStatus.FAILED_BOTTOM; |
| |
| |
| /** |
| * Positions a movable element relative to an anchor element. The caller |
| * specifies the corners that should touch. This functions then moves the |
| * movable element accordingly. |
| * |
| * @param {Element} anchorElement The element that is the anchor for where |
| * the movable element should position itself. |
| * @param {goog.positioning.Corner} anchorElementCorner The corner of the |
| * anchorElement for positioning the movable element. |
| * @param {Element} movableElement The element to move. |
| * @param {goog.positioning.Corner} movableElementCorner The corner of the |
| * movableElement that that should be positioned adjacent to the anchor |
| * element. |
| * @param {goog.math.Coordinate=} opt_offset An offset specified in pixels. |
| * After the normal positioning algorithm is applied, the offset is then |
| * applied. Positive coordinates move the popup closer to the center of the |
| * anchor element. Negative coordinates move the popup away from the center |
| * of the anchor element. |
| * @param {goog.math.Box=} opt_margin A margin specified in pixels. |
| * After the normal positioning algorithm is applied and any offset, the |
| * margin is then applied. Positive coordinates move the popup away from the |
| * spot it was positioned towards its center. Negative coordinates move it |
| * towards the spot it was positioned away from its center. |
| * @param {?number=} opt_overflow Overflow handling mode. Defaults to IGNORE if |
| * not specified. Bitmap, {@see goog.positioning.Overflow}. |
| * @param {goog.math.Size=} opt_preferredSize The preferred size of the |
| * movableElement. |
| * @param {goog.math.Box=} opt_viewport Box object describing the dimensions of |
| * the viewport. The viewport is specified relative to offsetParent of |
| * {@code movableElement}. In other words, the viewport can be thought of as |
| * describing a "position: absolute" element contained in the offsetParent. |
| * It defaults to visible area of nearest scrollable ancestor of |
| * {@code movableElement} (see {@code goog.style.getVisibleRectForElement}). |
| * @return {goog.positioning.OverflowStatus} Status bitmap, |
| * {@see goog.positioning.OverflowStatus}. |
| */ |
| goog.positioning.positionAtAnchor = function(anchorElement, |
| anchorElementCorner, |
| movableElement, |
| movableElementCorner, |
| opt_offset, |
| opt_margin, |
| opt_overflow, |
| opt_preferredSize, |
| opt_viewport) { |
| |
| goog.asserts.assert(movableElement); |
| var movableParentTopLeft = |
| goog.positioning.getOffsetParentPageOffset(movableElement); |
| |
| // Get the visible part of the anchor element. anchorRect is |
| // relative to anchorElement's page. |
| var anchorRect = goog.positioning.getVisiblePart_(anchorElement); |
| |
| // Translate anchorRect to be relative to movableElement's page. |
| goog.style.translateRectForAnotherFrame( |
| anchorRect, |
| goog.dom.getDomHelper(anchorElement), |
| goog.dom.getDomHelper(movableElement)); |
| |
| // Offset based on which corner of the element we want to position against. |
| var corner = goog.positioning.getEffectiveCorner(anchorElement, |
| anchorElementCorner); |
| // absolutePos is a candidate position relative to the |
| // movableElement's window. |
| var absolutePos = new goog.math.Coordinate( |
| corner & goog.positioning.CornerBit.RIGHT ? |
| anchorRect.left + anchorRect.width : anchorRect.left, |
| corner & goog.positioning.CornerBit.BOTTOM ? |
| anchorRect.top + anchorRect.height : anchorRect.top); |
| |
| // Translate absolutePos to be relative to the offsetParent. |
| absolutePos = |
| goog.math.Coordinate.difference(absolutePos, movableParentTopLeft); |
| |
| // Apply offset, if specified |
| if (opt_offset) { |
| absolutePos.x += (corner & goog.positioning.CornerBit.RIGHT ? -1 : 1) * |
| opt_offset.x; |
| absolutePos.y += (corner & goog.positioning.CornerBit.BOTTOM ? -1 : 1) * |
| opt_offset.y; |
| } |
| |
| // Determine dimension of viewport. |
| var viewport; |
| if (opt_overflow) { |
| if (opt_viewport) { |
| viewport = opt_viewport; |
| } else { |
| viewport = goog.style.getVisibleRectForElement(movableElement); |
| if (viewport) { |
| viewport.top -= movableParentTopLeft.y; |
| viewport.right -= movableParentTopLeft.x; |
| viewport.bottom -= movableParentTopLeft.y; |
| viewport.left -= movableParentTopLeft.x; |
| } |
| } |
| } |
| |
| return goog.positioning.positionAtCoordinate(absolutePos, |
| movableElement, |
| movableElementCorner, |
| opt_margin, |
| viewport, |
| opt_overflow, |
| opt_preferredSize); |
| }; |
| |
| |
| /** |
| * Calculates the page offset of the given element's |
| * offsetParent. This value can be used to translate any x- and |
| * y-offset relative to the page to an offset relative to the |
| * offsetParent, which can then be used directly with as position |
| * coordinate for {@code positionWithCoordinate}. |
| * @param {!Element} movableElement The element to calculate. |
| * @return {!goog.math.Coordinate} The page offset, may be (0, 0). |
| */ |
| goog.positioning.getOffsetParentPageOffset = function(movableElement) { |
| // Ignore offset for the BODY element unless its position is non-static. |
| // For cases where the offset parent is HTML rather than the BODY (such as in |
| // IE strict mode) there's no need to get the position of the BODY as it |
| // doesn't affect the page offset. |
| var movableParentTopLeft; |
| var parent = movableElement.offsetParent; |
| if (parent) { |
| var isBody = parent.tagName == goog.dom.TagName.HTML || |
| parent.tagName == goog.dom.TagName.BODY; |
| if (!isBody || |
| goog.style.getComputedPosition(parent) != 'static') { |
| // Get the top-left corner of the parent, in page coordinates. |
| movableParentTopLeft = goog.style.getPageOffset(parent); |
| |
| if (!isBody) { |
| movableParentTopLeft = goog.math.Coordinate.difference( |
| movableParentTopLeft, |
| new goog.math.Coordinate(goog.style.bidi.getScrollLeft(parent), |
| parent.scrollTop)); |
| } |
| } |
| } |
| |
| return movableParentTopLeft || new goog.math.Coordinate(); |
| }; |
| |
| |
| /** |
| * Returns intersection of the specified element and |
| * goog.style.getVisibleRectForElement for it. |
| * |
| * @param {Element} el The target element. |
| * @return {!goog.math.Rect} Intersection of getVisibleRectForElement |
| * and the current bounding rectangle of the element. If the |
| * intersection is empty, returns the bounding rectangle. |
| * @private |
| */ |
| goog.positioning.getVisiblePart_ = function(el) { |
| var rect = goog.style.getBounds(el); |
| var visibleBox = goog.style.getVisibleRectForElement(el); |
| if (visibleBox) { |
| rect.intersection(goog.math.Rect.createFromBox(visibleBox)); |
| } |
| return rect; |
| }; |
| |
| |
| /** |
| * Positions the specified corner of the movable element at the |
| * specified coordinate. |
| * |
| * @param {goog.math.Coordinate} absolutePos The coordinate to position the |
| * element at. |
| * @param {Element} movableElement The element to be positioned. |
| * @param {goog.positioning.Corner} movableElementCorner The corner of the |
| * movableElement that that should be positioned. |
| * @param {goog.math.Box=} opt_margin A margin specified in pixels. |
| * After the normal positioning algorithm is applied and any offset, the |
| * margin is then applied. Positive coordinates move the popup away from the |
| * spot it was positioned towards its center. Negative coordinates move it |
| * towards the spot it was positioned away from its center. |
| * @param {goog.math.Box=} opt_viewport Box object describing the dimensions of |
| * the viewport. Required if opt_overflow is specified. |
| * @param {?number=} opt_overflow Overflow handling mode. Defaults to IGNORE if |
| * not specified, {@see goog.positioning.Overflow}. |
| * @param {goog.math.Size=} opt_preferredSize The preferred size of the |
| * movableElement. Defaults to the current size. |
| * @return {goog.positioning.OverflowStatus} Status bitmap. |
| */ |
| goog.positioning.positionAtCoordinate = function(absolutePos, |
| movableElement, |
| movableElementCorner, |
| opt_margin, |
| opt_viewport, |
| opt_overflow, |
| opt_preferredSize) { |
| absolutePos = absolutePos.clone(); |
| |
| // Offset based on attached corner and desired margin. |
| var corner = goog.positioning.getEffectiveCorner(movableElement, |
| movableElementCorner); |
| var elementSize = goog.style.getSize(movableElement); |
| var size = opt_preferredSize ? opt_preferredSize.clone() : |
| elementSize.clone(); |
| |
| var positionResult = goog.positioning.getPositionAtCoordinate(absolutePos, |
| size, corner, opt_margin, opt_viewport, opt_overflow); |
| |
| if (positionResult.status & goog.positioning.OverflowStatus.FAILED) { |
| return positionResult.status; |
| } |
| |
| goog.style.setPosition(movableElement, positionResult.rect.getTopLeft()); |
| size = positionResult.rect.getSize(); |
| if (!goog.math.Size.equals(elementSize, size)) { |
| goog.style.setBorderBoxSize(movableElement, size); |
| } |
| |
| return positionResult.status; |
| }; |
| |
| |
| /** |
| * Computes the position for an element to be placed on-screen at the |
| * specified coordinates. Returns an object containing both the resulting |
| * rectangle, and the overflow status bitmap. |
| * |
| * @param {!goog.math.Coordinate} absolutePos The coordinate to position the |
| * element at. |
| * @param {!goog.math.Size} elementSize The size of the element to be |
| * positioned. |
| * @param {goog.positioning.Corner} elementCorner The corner of the |
| * movableElement that that should be positioned. |
| * @param {goog.math.Box=} opt_margin A margin specified in pixels. |
| * After the normal positioning algorithm is applied and any offset, the |
| * margin is then applied. Positive coordinates move the popup away from the |
| * spot it was positioned towards its center. Negative coordinates move it |
| * towards the spot it was positioned away from its center. |
| * @param {goog.math.Box=} opt_viewport Box object describing the dimensions of |
| * the viewport. Required if opt_overflow is specified. |
| * @param {?number=} opt_overflow Overflow handling mode. Defaults to IGNORE |
| * if not specified, {@see goog.positioning.Overflow}. |
| * @return {{rect:!goog.math.Rect, status:goog.positioning.OverflowStatus}} |
| * Object containing the computed position and status bitmap. |
| */ |
| goog.positioning.getPositionAtCoordinate = function( |
| absolutePos, |
| elementSize, |
| elementCorner, |
| opt_margin, |
| opt_viewport, |
| opt_overflow) { |
| absolutePos = absolutePos.clone(); |
| elementSize = elementSize.clone(); |
| var status = goog.positioning.OverflowStatus.NONE; |
| |
| if (opt_margin || elementCorner != goog.positioning.Corner.TOP_LEFT) { |
| if (elementCorner & goog.positioning.CornerBit.RIGHT) { |
| absolutePos.x -= elementSize.width + (opt_margin ? opt_margin.right : 0); |
| } else if (opt_margin) { |
| absolutePos.x += opt_margin.left; |
| } |
| if (elementCorner & goog.positioning.CornerBit.BOTTOM) { |
| absolutePos.y -= elementSize.height + |
| (opt_margin ? opt_margin.bottom : 0); |
| } else if (opt_margin) { |
| absolutePos.y += opt_margin.top; |
| } |
| } |
| |
| // Adjust position to fit inside viewport. |
| if (opt_overflow) { |
| status = opt_viewport ? |
| goog.positioning.adjustForViewport_( |
| absolutePos, elementSize, opt_viewport, opt_overflow) : |
| goog.positioning.OverflowStatus.FAILED_OUTSIDE_VIEWPORT; |
| } |
| |
| var rect = new goog.math.Rect(0, 0, 0, 0); |
| rect.left = absolutePos.x; |
| rect.top = absolutePos.y; |
| rect.width = elementSize.width; |
| rect.height = elementSize.height; |
| return {rect: rect, status: status}; |
| }; |
| |
| |
| /** |
| * Adjusts the position and/or size of an element, identified by its position |
| * and size, to fit inside the viewport. If the position or size of the element |
| * is adjusted the pos or size objects, respectively, are modified. |
| * |
| * @param {goog.math.Coordinate} pos Position of element, updated if the |
| * position is adjusted. |
| * @param {goog.math.Size} size Size of element, updated if the size is |
| * adjusted. |
| * @param {goog.math.Box} viewport Bounding box describing the viewport. |
| * @param {number} overflow Overflow handling mode, |
| * {@see goog.positioning.Overflow}. |
| * @return {goog.positioning.OverflowStatus} Status bitmap, |
| * {@see goog.positioning.OverflowStatus}. |
| * @private |
| */ |
| goog.positioning.adjustForViewport_ = function(pos, size, viewport, overflow) { |
| var status = goog.positioning.OverflowStatus.NONE; |
| |
| var ADJUST_X_EXCEPT_OFFSCREEN = |
| goog.positioning.Overflow.ADJUST_X_EXCEPT_OFFSCREEN; |
| var ADJUST_Y_EXCEPT_OFFSCREEN = |
| goog.positioning.Overflow.ADJUST_Y_EXCEPT_OFFSCREEN; |
| if ((overflow & ADJUST_X_EXCEPT_OFFSCREEN) == ADJUST_X_EXCEPT_OFFSCREEN && |
| (pos.x < viewport.left || pos.x >= viewport.right)) { |
| overflow &= ~goog.positioning.Overflow.ADJUST_X; |
| } |
| if ((overflow & ADJUST_Y_EXCEPT_OFFSCREEN) == ADJUST_Y_EXCEPT_OFFSCREEN && |
| (pos.y < viewport.top || pos.y >= viewport.bottom)) { |
| overflow &= ~goog.positioning.Overflow.ADJUST_Y; |
| } |
| |
| // Left edge outside viewport, try to move it. |
| if (pos.x < viewport.left && overflow & goog.positioning.Overflow.ADJUST_X) { |
| pos.x = viewport.left; |
| status |= goog.positioning.OverflowStatus.ADJUSTED_X; |
| } |
| |
| // Ensure object is inside the viewport width if required. |
| if (overflow & goog.positioning.Overflow.RESIZE_WIDTH) { |
| // Move left edge inside viewport. |
| var originalX = pos.x; |
| if (pos.x < viewport.left) { |
| pos.x = viewport.left; |
| status |= goog.positioning.OverflowStatus.WIDTH_ADJUSTED; |
| } |
| |
| // Shrink width to inside right of viewport. |
| if (pos.x + size.width > viewport.right) { |
| // Set the width to be either the new maximum width within the viewport |
| // or the width originally within the viewport, whichever is less. |
| size.width = Math.min( |
| viewport.right - pos.x, originalX + size.width - viewport.left); |
| size.width = Math.max(size.width, 0); |
| status |= goog.positioning.OverflowStatus.WIDTH_ADJUSTED; |
| } |
| } |
| |
| // Right edge outside viewport, try to move it. |
| if (pos.x + size.width > viewport.right && |
| overflow & goog.positioning.Overflow.ADJUST_X) { |
| pos.x = Math.max(viewport.right - size.width, viewport.left); |
| status |= goog.positioning.OverflowStatus.ADJUSTED_X; |
| } |
| |
| // Left or right edge still outside viewport, fail if the FAIL_X option was |
| // specified, ignore it otherwise. |
| if (overflow & goog.positioning.Overflow.FAIL_X) { |
| status |= (pos.x < viewport.left ? |
| goog.positioning.OverflowStatus.FAILED_LEFT : 0) | |
| (pos.x + size.width > viewport.right ? |
| goog.positioning.OverflowStatus.FAILED_RIGHT : 0); |
| } |
| |
| // Top edge outside viewport, try to move it. |
| if (pos.y < viewport.top && overflow & goog.positioning.Overflow.ADJUST_Y) { |
| pos.y = viewport.top; |
| status |= goog.positioning.OverflowStatus.ADJUSTED_Y; |
| } |
| |
| // Ensure object is inside the viewport height if required. |
| if (overflow & goog.positioning.Overflow.RESIZE_HEIGHT) { |
| // Move top edge inside viewport. |
| var originalY = pos.y; |
| if (pos.y < viewport.top) { |
| pos.y = viewport.top; |
| status |= goog.positioning.OverflowStatus.HEIGHT_ADJUSTED; |
| } |
| |
| // Shrink height to inside bottom of viewport. |
| if (pos.y + size.height > viewport.bottom) { |
| // Set the height to be either the new maximum height within the viewport |
| // or the height originally within the viewport, whichever is less. |
| size.height = Math.min( |
| viewport.bottom - pos.y, originalY + size.height - viewport.top); |
| size.height = Math.max(size.height, 0); |
| status |= goog.positioning.OverflowStatus.HEIGHT_ADJUSTED; |
| } |
| } |
| |
| // Bottom edge outside viewport, try to move it. |
| if (pos.y + size.height > viewport.bottom && |
| overflow & goog.positioning.Overflow.ADJUST_Y) { |
| pos.y = Math.max(viewport.bottom - size.height, viewport.top); |
| status |= goog.positioning.OverflowStatus.ADJUSTED_Y; |
| } |
| |
| // Top or bottom edge still outside viewport, fail if the FAIL_Y option was |
| // specified, ignore it otherwise. |
| if (overflow & goog.positioning.Overflow.FAIL_Y) { |
| status |= (pos.y < viewport.top ? |
| goog.positioning.OverflowStatus.FAILED_TOP : 0) | |
| (pos.y + size.height > viewport.bottom ? |
| goog.positioning.OverflowStatus.FAILED_BOTTOM : 0); |
| } |
| |
| return status; |
| }; |
| |
| |
| /** |
| * Returns an absolute corner (top/bottom left/right) given an absolute |
| * or relative (top/bottom start/end) corner and the direction of an element. |
| * Absolute corners remain unchanged. |
| * @param {Element} element DOM element to test for RTL direction. |
| * @param {goog.positioning.Corner} corner The popup corner used for |
| * positioning. |
| * @return {goog.positioning.Corner} Effective corner. |
| */ |
| goog.positioning.getEffectiveCorner = function(element, corner) { |
| return /** @type {goog.positioning.Corner} */ ( |
| (corner & goog.positioning.CornerBit.FLIP_RTL && |
| goog.style.isRightToLeft(element) ? |
| corner ^ goog.positioning.CornerBit.RIGHT : |
| corner |
| ) & ~goog.positioning.CornerBit.FLIP_RTL); |
| }; |
| |
| |
| /** |
| * Returns the corner opposite the given one horizontally. |
| * @param {goog.positioning.Corner} corner The popup corner used to flip. |
| * @return {goog.positioning.Corner} The opposite corner horizontally. |
| */ |
| goog.positioning.flipCornerHorizontal = function(corner) { |
| return /** @type {goog.positioning.Corner} */ (corner ^ |
| goog.positioning.CornerBit.RIGHT); |
| }; |
| |
| |
| /** |
| * Returns the corner opposite the given one vertically. |
| * @param {goog.positioning.Corner} corner The popup corner used to flip. |
| * @return {goog.positioning.Corner} The opposite corner vertically. |
| */ |
| goog.positioning.flipCornerVertical = function(corner) { |
| return /** @type {goog.positioning.Corner} */ (corner ^ |
| goog.positioning.CornerBit.BOTTOM); |
| }; |
| |
| |
| /** |
| * Returns the corner opposite the given one horizontally and vertically. |
| * @param {goog.positioning.Corner} corner The popup corner used to flip. |
| * @return {goog.positioning.Corner} The opposite corner horizontally and |
| * vertically. |
| */ |
| goog.positioning.flipCorner = function(corner) { |
| return /** @type {goog.positioning.Corner} */ (corner ^ |
| goog.positioning.CornerBit.BOTTOM ^ |
| goog.positioning.CornerBit.RIGHT); |
| }; |
| |
