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// 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);
};
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