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// Copyright 2011 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 Utilities for inspecting page layout. This is a port of
* http://go/layoutbot.java
* See {@link http://go/layouttesting}.
*/
goog.provide('goog.testing.style');
goog.require('goog.dom');
goog.require('goog.math.Rect');
goog.require('goog.style');
/**
* Determines whether the bounding rectangles of the given elements intersect.
* @param {Element} element The first element.
* @param {Element} otherElement The second element.
* @return {boolean} Whether the bounding rectangles of the given elements
* intersect.
*/
goog.testing.style.intersects = function(element, otherElement) {
var elementRect = goog.style.getBounds(element);
var otherElementRect = goog.style.getBounds(otherElement);
return goog.math.Rect.intersects(elementRect, otherElementRect);
};
/**
* Determines whether the element has visible dimensions, i.e. x > 0 && y > 0.
* @param {Element} element The element to check.
* @return {boolean} Whether the element has visible dimensions.
*/
goog.testing.style.hasVisibleDimensions = function(element) {
var elSize = goog.style.getSize(element);
var shortest = elSize.getShortest();
if (shortest <= 0) {
return false;
}
return true;
};
/**
* Determines whether the CSS style of the element renders it visible.
* @param {!Element} element The element to check.
* @return {boolean} Whether the CSS style of the element renders it visible.
*/
goog.testing.style.isVisible = function(element) {
var visibilityStyle =
goog.testing.style.getAvailableStyle_(element, 'visibility');
var displayStyle =
goog.testing.style.getAvailableStyle_(element, 'display');
return (visibilityStyle != 'hidden' && displayStyle != 'none');
};
/**
* Test whether the given element is on screen.
* @param {!Element} el The element to test.
* @return {boolean} Whether the element is on the screen.
*/
goog.testing.style.isOnScreen = function(el) {
var doc = goog.dom.getDomHelper(el).getDocument();
var viewport = goog.style.getVisibleRectForElement(doc.body);
var viewportRect = goog.math.Rect.createFromBox(viewport);
return goog.dom.contains(doc, el) &&
goog.style.getBounds(el).intersects(viewportRect);
};
/**
* This is essentially goog.style.getStyle_. goog.style.getStyle_ is private
* and is not a recommended way for general purpose style extractor. For the
* purposes of layout testing, we only use this function for retrieving
* 'visiblity' and 'display' style.
* @param {!Element} element The element to retrieve the style from.
* @param {string} style Style property name.
* @return {string} Style value.
* @private
*/
goog.testing.style.getAvailableStyle_ = function(element, style) {
return goog.style.getComputedStyle(element, style) ||
goog.style.getCascadedStyle(element, style) ||
goog.style.getStyle(element, style);
};
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