79 lines
2.5 KiB
JavaScript
79 lines
2.5 KiB
JavaScript
// Copyright 2011 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 Shared unit tests for scrollbar measurement.
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*
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* @author flan@google.com (Ian Flanigan)
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*/
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goog.provide('goog.styleScrollbarTester');
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goog.require('goog.dom');
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goog.require('goog.style');
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goog.require('goog.testing.asserts');
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goog.setTestOnly('goog.styleScrollbarTester');
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/**
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* Tests the scrollbar width calculation. Assumes that there is an element with
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* id 'test-scrollbarwidth' in the page.
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*/
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function testScrollbarWidth() {
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var width = goog.style.getScrollbarWidth();
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assertTrue(width > 0);
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var outer = goog.dom.getElement('test-scrollbarwidth');
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var inner = goog.dom.getElementsByTagNameAndClass('div', null, outer)[0];
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assertTrue('should have a scroll bar',
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hasVerticalScroll(outer));
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assertTrue('should have a scroll bar',
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hasHorizontalScroll(outer));
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// Get the inner div absolute width
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goog.style.setStyle(outer, 'width', '100%');
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assertTrue('should have a scroll bar',
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hasVerticalScroll(outer));
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assertFalse('should not have a scroll bar',
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hasHorizontalScroll(outer));
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var innerAbsoluteWidth = inner.offsetWidth;
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// Leave the vertical scroll and remove the horizontal by using the scroll
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// bar width calculation.
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goog.style.setStyle(outer, 'width',
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(innerAbsoluteWidth + width) + 'px');
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assertTrue('should have a scroll bar',
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hasVerticalScroll(outer));
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assertFalse('should not have a scroll bar',
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hasHorizontalScroll(outer));
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// verify by adding 1 more pixel (brings back the vertical scroll bar).
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goog.style.setStyle(outer, 'width',
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(innerAbsoluteWidth + width - 1) + 'px');
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assertTrue('should have a scroll bar',
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hasVerticalScroll(outer));
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assertTrue('should have a scroll bar',
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hasHorizontalScroll(outer));
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}
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function hasVerticalScroll(el) {
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return el.clientWidth != 0 && el.offsetWidth - el.clientWidth > 0;
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}
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function hasHorizontalScroll(el) {
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return el.clientHeight != 0 && el.offsetHeight - el.clientHeight > 0;
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}
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