1# Copyright 2015 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.
4
5import numbers
6
7from telemetry.internal.actions import page_action
8from telemetry.internal.actions import utils
9from telemetry.web_perf import timeline_interaction_record
10
11
12class RepeatableScrollAction(page_action.PageAction):
13
14  def __init__(self, x_scroll_distance_ratio=0.0, y_scroll_distance_ratio=0.5,
15               repeat_count=0, repeat_delay_ms=250, timeout=60,
16               prevent_fling=None, speed=None):
17    super(RepeatableScrollAction, self).__init__()
18    self._x_scroll_distance_ratio = x_scroll_distance_ratio
19    self._y_scroll_distance_ratio = y_scroll_distance_ratio
20    self._repeat_count = repeat_count
21    self._repeat_delay_ms = repeat_delay_ms
22    self._windowsize = []
23    self._timeout = timeout
24    self._prevent_fling = prevent_fling
25    self._speed = speed
26
27  def WillRunAction(self, tab):
28    utils.InjectJavaScript(tab, 'gesture_common.js')
29    # Get the dimensions of the screen.
30    self._windowsize = tab.EvaluateJavaScript(
31        '[__GestureCommon_GetWindowWidth(),'
32        ' __GestureCommon_GetWindowHeight()]')
33    assert len(self._windowsize) == 2
34    assert all(isinstance(d, numbers.Number) for d in self._windowsize)
35
36  def RunAction(self, tab):
37    # Set up a browser driven repeating scroll. The delay between the scrolls
38    # should be unaffected by render thread responsivness (or lack there of).
39    tab.SynthesizeScrollGesture(
40        x=int(self._windowsize[0] / 2),
41        y=int(self._windowsize[1] / 2),
42        xDistance=int(self._x_scroll_distance_ratio * self._windowsize[0]),
43        yDistance=int(-self._y_scroll_distance_ratio * self._windowsize[1]),
44        preventFling=self._prevent_fling,
45        speed=self._speed,
46        repeatCount=self._repeat_count,
47        repeatDelayMs=self._repeat_delay_ms,
48        interactionMarkerName=timeline_interaction_record.GetJavaScriptMarker(
49            'Gesture_ScrollAction', [timeline_interaction_record.REPEATABLE]),
50        timeout=self._timeout)
51