122 lines
4.4 KiB
JavaScript
122 lines
4.4 KiB
JavaScript
// 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.math.Box');
|
|
goog.require('goog.math.Coordinate');
|
|
goog.require('goog.math.Size');
|
|
goog.require('goog.positioning.ClientPosition');
|
|
|
|
|
|
|
|
/**
|
|
* 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);
|
|
};
|