1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
6 * @suppress {checkTypes}
9 * Browser test for the scenario below:
10 * 1. Resize the client window to various sizes and verify the existence of
11 * horizontal and/or vertical scroll-bars.
12 * 2. TODO(jamiewalch): Connect to a host and toggle various combinations of
13 * scale and resize; repeat test 1.
14 * 3. TODO(jamiewalch): Disconnect; repeat test 1.
20 browserTest.Scrollbars = function() {
21 this.scroller_ = document.getElementById('scroller');
22 this.SCROLLBAR_WIDTH_ = 16;
23 this.BORDER_WIDTH_ = 1;
25 // The top border is already accounted for by getBoundingClientRect, but
26 // the bottom border is not.
27 var marker = document.getElementById('bottom-marker');
28 this.CONTENT_HEIGHT_ =
29 marker.getBoundingClientRect().top + this.BORDER_WIDTH_;
31 // The width of the content is computed from the width of a <section> (690px)
32 // plus the margin of the "inset" class (20px). There's no easy way to get
33 // that without hard-coding it. In fact, this is a bit simplistic because
34 // the horizontal space required by the header depends on the length of the
36 this.CONTENT_WIDTH_ = 690 + 20 + 2 * this.BORDER_WIDTH_;
41 browserTest.Scrollbars.prototype.run = function(data) {
42 if (!base.isAppsV2()) {
44 'Scroll-bar testing requires resizing the app window, which can ' +
45 'only be done programmatically in apps v2.');
48 // Verify that scrollbars are added/removed correctly on the home screen.
49 this.verifyHomeScreenScrollbars_()
50 .then(browserTest.pass, browserTest.fail);
55 * Verify the test cases for the home-screen.
57 browserTest.Scrollbars.prototype.verifyHomeScreenScrollbars_ = function() {
58 // Note that, due to crbug.com/240772, if the window already has
59 // scroll-bars, they will not be removed if the window size is
60 // increased by less than the scroll-bar width. We work around that
61 // when connected to a host because we know how big the content is
62 // (in fact, testing this work-around is the main motivation for
63 // writing this test), but it's not worth it for the home screen,
64 // so make the window large not to require scrollbars before each test.
65 var tooWide = this.CONTENT_WIDTH_ + 100;
66 var tooTall = this.CONTENT_HEIGHT_ + 100;
67 var removeScrollbars = this.resize_.bind(this, tooWide, tooTall);
69 // Verify there are no scroll-bars if the window is as big as it needs
71 return removeScrollbars()
72 .then(this.resizeAndVerifyScroll_(
77 // Verify there is a vertical scroll-bar if the window is shorter than it
79 .then(removeScrollbars)
80 .then(this.resizeAndVerifyScroll_.bind(
82 this.CONTENT_WIDTH_ + this.SCROLLBAR_WIDTH_,
83 this.CONTENT_HEIGHT_ - 1,
86 // Verify there is a horizontal scroll-bar if the window is narrow than it
88 .then(removeScrollbars)
89 .then(this.resizeAndVerifyScroll_.bind(
91 this.CONTENT_WIDTH_ - 1,
92 this.CONTENT_HEIGHT_ + this.SCROLLBAR_WIDTH_,
95 // Verify there are both horizontal and vertical scroll-bars, even if one
96 // is only needed as a result of the space occupied by the other.
97 .then(removeScrollbars)
98 .then(this.resizeAndVerifyScroll_.bind(
101 this.CONTENT_HEIGHT_ - 1,
103 .then(removeScrollbars)
104 .then(this.resizeAndVerifyScroll_.bind(
106 this.CONTENT_WIDTH_ - 1,
107 this.CONTENT_HEIGHT_,
110 // Verify there are both horizontal and vertical scroll-bars, if both are
111 // required independently.
112 .then(removeScrollbars)
113 .then(this.resizeAndVerifyScroll_.bind(
115 this.CONTENT_WIDTH_ - 1,
116 this.CONTENT_HEIGHT_ - 1,
122 * Returns whether or not horizontal and vertical scroll-bars are expected
123 * and visible. To do this, it performs a hit-test close to the right and
124 * bottom edges of the scroller <div>; since the content of that <div> fills
125 * it completely, the hit-test will return the content unless there is a
126 * scroll-bar visible on the corresponding edge, in which case it will return
127 * the scroller <div> itself.
131 browserTest.Scrollbars.prototype.getScrollbarState_ = function() {
132 var rect = this.scroller_.getBoundingClientRect();
133 var rightElement = document.elementFromPoint(
134 rect.right - 1, (rect.top + rect.bottom) / 2);
135 var bottomElement = document.elementFromPoint(
136 (rect.left + rect.right) / 2, rect.bottom - 1);
138 horizontal: bottomElement === this.scroller_,
139 vertical: rightElement === this.scroller_
145 * Returns a promise that resolves if the scroll-bar state is as expected, or
150 browserTest.Scrollbars.prototype.verifyScrollbarState_ =
151 function(horizontalExpected, verticalExpected) {
152 var scrollbarState = this.getScrollbarState_();
153 if (scrollbarState.horizontal && !horizontalExpected) {
154 return Promise.reject(new Error(
155 'Horizontal scrollbar present but not expected.'));
156 } else if (!scrollbarState.horizontal && horizontalExpected) {
157 return Promise.reject(new Error(
158 'Horizontal scrollbar expected but not present.'));
159 } else if (scrollbarState.vertical && !verticalExpected) {
160 return Promise.reject(new Error(
161 'Vertical scrollbar present but not expected.'));
162 } else if (!scrollbarState.vertical && verticalExpected) {
163 return Promise.reject(new Error(
164 'Vertical scrollbar expected but not present.'));
166 return Promise.resolve();
172 * @return {Promise} A promise that will be fulfilled when the window has
173 * been resized and it's safe to test scroll-bar visibility.
175 browserTest.Scrollbars.prototype.resize_ = function(width, height) {
176 var win = chrome.app.window.current();
177 win.resizeTo(width, height);
178 // Chrome takes a while to update the scroll-bars, so don't resolve
179 // immediately. Waiting for the onBoundsChanged event would be cleaner,
180 // but isn't reliable.
181 return base.Promise.sleep(500);
187 * @return {Promise} A promise that will be fulfilled when the window has
188 * been resized and it's safe to test scroll-bar visibility.
190 browserTest.Scrollbars.prototype.resizeAndVerifyScroll_ =
191 function(width, height, horizontalExpected, verticalExpected) {
192 return this.resize_(width, height).then(
193 this.verifyScrollbarState_.bind(
194 this, horizontalExpected, verticalExpected));