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// 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 Client positioning class.
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 *
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 * @author [email protected] (Emil A Eklund)
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 */
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goog.provide('goog.positioning.ViewportPosition');
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goog.require('goog.math.Coordinate');
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goog.require('goog.positioning');
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goog.require('goog.positioning.AbstractPosition');
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goog.require('goog.positioning.Corner');
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goog.require('goog.style');
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/**
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 * Encapsulates a popup position where the popup is positioned according to
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 * coordinates relative to the  element's viewport (page). This calculates the
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 * correct position to use even if the element is relatively positioned to some
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 * other element.
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 *
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 * @param {number|goog.math.Coordinate} arg1 Left position or coordinate.
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 * @param {number=} opt_arg2 Top position.
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 * @constructor
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 * @extends {goog.positioning.AbstractPosition}
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 */
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goog.positioning.ViewportPosition = function(arg1, opt_arg2) {
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  this.coordinate = arg1 instanceof goog.math.Coordinate ?
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      arg1 :
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      new goog.math.Coordinate(/** @type {number} */ (arg1), opt_arg2);
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};
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goog.inherits(
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    goog.positioning.ViewportPosition, goog.positioning.AbstractPosition);
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/**
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 * Repositions the popup according to the current state
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 *
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 * @param {Element} element The DOM element of the popup.
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 * @param {goog.positioning.Corner} popupCorner The corner of the popup
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 *     element that that should be positioned adjacent to the anchorElement.
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 * @param {goog.math.Box=} opt_margin A margin specified in pixels.
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 * @param {goog.math.Size=} opt_preferredSize Preferred size of the element.
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 * @override
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 */
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goog.positioning.ViewportPosition.prototype.reposition = function(
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    element, popupCorner, opt_margin, opt_preferredSize) {
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  goog.positioning.positionAtAnchor(
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      goog.style.getClientViewportElement(element),
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      goog.positioning.Corner.TOP_LEFT, element, popupCorner, this.coordinate,
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      opt_margin, null, opt_preferredSize);
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};
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