1 # Copyright 2012 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.
7 from telemetry.page.actions import scroll
8 from telemetry.unittest import tab_test_case
9 from telemetry.unittest import test
12 class ScrollActionTest(tab_test_case.TabTestCase):
13 @test.Disabled # Disabled due to flakiness: crbug.com/330544
14 def testScrollAction(self):
15 self.Navigate('blank.html')
17 # Make page bigger than window so it's scrollable.
18 self._tab.ExecuteJavaScript("""document.body.style.height =
19 (2 * window.innerHeight + 1) + 'px';""")
22 self._tab.EvaluateJavaScript("""document.documentElement.scrollTop
23 || document.body.scrollTop"""), 0)
25 i = scroll.ScrollAction()
26 i.WillRunAction(self._tab)
28 self._tab.ExecuteJavaScript("""
29 window.__scrollAction.beginMeasuringHook = function() {
30 window.__didBeginMeasuring = true;
32 window.__scrollAction.endMeasuringHook = function() {
33 window.__didEndMeasuring = true;
35 i.RunAction(self._tab)
37 self.assertTrue(self._tab.EvaluateJavaScript('window.__didBeginMeasuring'))
38 self.assertTrue(self._tab.EvaluateJavaScript('window.__didEndMeasuring'))
40 # Allow for roundoff error in scaled viewport.
41 scroll_position = self._tab.EvaluateJavaScript(
42 """(document.documentElement.scrollTop || document.body.scrollTop)
43 + window.innerHeight""")
44 scroll_height = self._tab.EvaluateJavaScript('document.body.scrollHeight')
45 difference = scroll_position - scroll_height
46 self.assertTrue(abs(difference) <= 1,
47 msg='scroll_position=%d; scroll_height=%d' %
48 (scroll_position, scroll_height))
50 def testBoundingClientRect(self):
51 self.Navigate('blank.html')
53 with open(os.path.join(os.path.dirname(__file__),
54 'gesture_common.js')) as f:
56 self._tab.ExecuteJavaScript(js)
58 # Verify that the rect returned by getBoundingVisibleRect() in scroll.js is
59 # completely contained within the viewport. Scroll events dispatched by the
60 # scrolling API use the center of this rect as their location, and this
61 # location needs to be within the viewport bounds to correctly decide
62 # between main-thread and impl-thread scroll. If the scrollable area were
63 # not clipped to the viewport bounds, then the instance used here (the
64 # scrollable area being more than twice as tall as the viewport) would
65 # result in a scroll location outside of the viewport bounds.
66 self._tab.ExecuteJavaScript("""document.body.style.height =
67 (3 * window.innerHeight + 1) + 'px';""")
68 self._tab.ExecuteJavaScript("""document.body.style.width =
69 (3 * window.innerWidth + 1) + 'px';""")
70 self._tab.ExecuteJavaScript(
71 "window.scrollTo(window.innerWidth, window.innerHeight);")
73 rect_top = int(self._tab.EvaluateJavaScript(
74 '__GestureCommon_GetBoundingVisibleRect(document.body).top'))
75 rect_height = int(self._tab.EvaluateJavaScript(
76 '__GestureCommon_GetBoundingVisibleRect(document.body).height'))
77 rect_bottom = rect_top + rect_height
79 rect_left = int(self._tab.EvaluateJavaScript(
80 '__GestureCommon_GetBoundingVisibleRect(document.body).left'))
81 rect_width = int(self._tab.EvaluateJavaScript(
82 '__GestureCommon_GetBoundingVisibleRect(document.body).width'))
83 rect_right = rect_left + rect_width
85 viewport_height = int(self._tab.EvaluateJavaScript('window.innerHeight'))
86 viewport_width = int(self._tab.EvaluateJavaScript('window.innerWidth'))
88 self.assertTrue(rect_top >= 0,
89 msg='%s >= %s' % (rect_top, 0))
90 self.assertTrue(rect_left >= 0,
91 msg='%s >= %s' % (rect_left, 0))
92 self.assertTrue(rect_bottom <= viewport_height,
93 msg='%s + %s <= %s' % (rect_top, rect_height, viewport_height))
94 self.assertTrue(rect_right <= viewport_width,
95 msg='%s + %s <= %s' % (rect_left, rect_width, viewport_width))