| // 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 Client viewport positioning class. |
| * |
| * @author robbyw@google.com (Robert Walker) |
| * @author eae@google.com (Emil A Eklund) |
| */ |
| |
| goog.provide('goog.positioning.ViewportClientPosition'); |
| |
| goog.require('goog.dom'); |
| goog.require('goog.math.Coordinate'); |
| goog.require('goog.positioning'); |
| goog.require('goog.positioning.ClientPosition'); |
| goog.require('goog.positioning.Overflow'); |
| goog.require('goog.positioning.OverflowStatus'); |
| goog.require('goog.style'); |
| |
| |
| |
| /** |
| * Encapsulates a popup position where the popup is positioned relative to the |
| * window (client) coordinates, and made to stay within the viewport. |
| * |
| * @param {number|goog.math.Coordinate} arg1 Left position or coordinate. |
| * @param {number=} opt_arg2 Top position if arg1 is a number representing the |
| * left position, ignored otherwise. |
| * @constructor |
| * @extends {goog.positioning.ClientPosition} |
| */ |
| goog.positioning.ViewportClientPosition = function(arg1, opt_arg2) { |
| goog.positioning.ClientPosition.call(this, arg1, opt_arg2); |
| }; |
| goog.inherits(goog.positioning.ViewportClientPosition, |
| goog.positioning.ClientPosition); |
| |
| |
| /** |
| * The last-resort overflow strategy, if the popup fails to fit. |
| * @type {number} |
| * @private |
| */ |
| goog.positioning.ViewportClientPosition.prototype.lastResortOverflow_ = 0; |
| |
| |
| /** |
| * Set the last-resort overflow strategy, if the popup fails to fit. |
| * @param {number} overflow A bitmask of goog.positioning.Overflow strategies. |
| */ |
| goog.positioning.ViewportClientPosition.prototype.setLastResortOverflow = |
| function(overflow) { |
| this.lastResortOverflow_ = overflow; |
| }; |
| |
| |
| /** |
| * Repositions the popup according to the current state. |
| * |
| * @param {Element} element The DOM element of the popup. |
| * @param {goog.positioning.Corner} popupCorner The corner of the popup |
| * element that that should be positioned adjacent to the anchorElement. |
| * One of the goog.positioning.Corner constants. |
| * @param {goog.math.Box=} opt_margin A margin specified in pixels. |
| * @param {goog.math.Size=} opt_preferredSize Preferred size fo the element. |
| * @override |
| */ |
| goog.positioning.ViewportClientPosition.prototype.reposition = function( |
| element, popupCorner, opt_margin, opt_preferredSize) { |
| var viewportElt = goog.style.getClientViewportElement(element); |
| var viewport = goog.style.getVisibleRectForElement(viewportElt); |
| var scrollEl = goog.dom.getDomHelper(element).getDocumentScrollElement(); |
| var clientPos = new goog.math.Coordinate( |
| this.coordinate.x + scrollEl.scrollLeft, |
| this.coordinate.y + scrollEl.scrollTop); |
| |
| var failXY = goog.positioning.Overflow.FAIL_X | |
| goog.positioning.Overflow.FAIL_Y; |
| var corner = popupCorner; |
| |
| // Try the requested position. |
| var status = goog.positioning.positionAtCoordinate(clientPos, element, corner, |
| opt_margin, viewport, failXY, opt_preferredSize); |
| if ((status & goog.positioning.OverflowStatus.FAILED) == 0) { |
| return; |
| } |
| |
| // Outside left or right edge of viewport, try try to flip it horizontally. |
| if (status & goog.positioning.OverflowStatus.FAILED_LEFT || |
| status & goog.positioning.OverflowStatus.FAILED_RIGHT) { |
| corner = goog.positioning.flipCornerHorizontal(corner); |
| } |
| |
| // Outside top or bottom edge of viewport, try try to flip it vertically. |
| if (status & goog.positioning.OverflowStatus.FAILED_TOP || |
| status & goog.positioning.OverflowStatus.FAILED_BOTTOM) { |
| corner = goog.positioning.flipCornerVertical(corner); |
| } |
| |
| // Try flipped position. |
| status = goog.positioning.positionAtCoordinate(clientPos, element, corner, |
| opt_margin, viewport, failXY, opt_preferredSize); |
| if ((status & goog.positioning.OverflowStatus.FAILED) == 0) { |
| return; |
| } |
| |
| // If that failed, the viewport is simply too small to contain the popup. |
| // Revert to the original position. |
| goog.positioning.positionAtCoordinate( |
| clientPos, element, popupCorner, opt_margin, viewport, |
| this.lastResortOverflow_, opt_preferredSize); |
| }; |