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