pinch.py revision 0529e5d033099cbfc42635f6f6183833b09dff6e 
1# Copyright 2013 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.
4import os
5
6from telemetry.page.actions.gesture_action import GestureAction
7from telemetry.page.actions import page_action
8
9class PinchAction(GestureAction):
10  def __init__(self, attributes=None):
11    super(PinchAction, self).__init__(attributes)
12
13  def WillRunAction(self, page, tab):
14    for js_file in ['gesture_common.js', 'pinch.js']:
15      with open(os.path.join(os.path.dirname(__file__), js_file)) as f:
16        js = f.read()
17        tab.ExecuteJavaScript(js)
18
19    # Fail if browser doesn't support synthetic pinch gestures.
20    if not tab.EvaluateJavaScript('window.__PinchAction_SupportedByBrowser()'):
21      raise page_action.PageActionNotSupported(
22          'Synthetic pinch not supported for this browser')
23
24    if (GestureAction.GetGestureSourceTypeFromOptions(tab) ==
25        'chrome.gpuBenchmarking.MOUSE_INPUT'):
26      raise page_action.PageActionNotSupported(
27          'Pinch page action does not support mouse input')
28
29    if not GestureAction.IsGestureSourceTypeSupported(tab, 'touch'):
30      raise page_action.PageActionNotSupported(
31          'Touch input not supported for this browser')
32
33    done_callback = 'function() { window.__pinchActionDone = true; }'
34    tab.ExecuteJavaScript("""
35        window.__pinchActionDone = false;
36        window.__pinchAction = new __PinchAction(%s);"""
37        % done_callback)
38
39  def RunGesture(self, page, tab):
40    left_anchor_percentage = getattr(self, 'left_anchor_percentage', 0.5)
41    top_anchor_percentage = getattr(self, 'top_anchor_percentage', 0.5)
42    zoom_in = getattr(self, 'zoom_in', True)
43    pixels_to_cover = getattr(self, 'pixels_to_cover', 500)
44    speed = getattr(self, 'speed', 800)
45
46    if hasattr(self, 'element_function'):
47      tab.ExecuteJavaScript("""
48          (%s)(function(element) { window.__pinchAction.start(
49             { element: element,
50               left_anchor_percentage: %s,
51               top_anchor_percentage: %s,
52               zoom_in: %s,
53               pixels_to_cover: %s,
54               speed: %s })
55             });""" % (self.element_function,
56                       left_anchor_percentage,
57                       top_anchor_percentage,
58                       'true' if zoom_in else 'false',
59                       pixels_to_cover,
60                       speed))
61    else:
62      tab.ExecuteJavaScript("""
63          window.__pinchAction.start(
64          { element: document.body,
65            left_anchor_percentage: %s,
66            top_anchor_percentage: %s,
67            zoom_in: %s,
68            pixels_to_cover: %s,
69            speed: %s });"""
70        % (left_anchor_percentage,
71           top_anchor_percentage,
72           'true' if zoom_in else 'false',
73           pixels_to_cover,
74           speed))
75
76    tab.WaitForJavaScriptExpression('window.__pinchActionDone', 60)
77
78  def CanBeBound(self):
79    return True
80
81  def BindMeasurementJavaScript(self, tab, start_js, stop_js):
82    # Make the pinch action start and stop measurement automatically.
83    tab.ExecuteJavaScript("""
84        window.__pinchAction.beginMeasuringHook = function() { %s };
85        window.__pinchAction.endMeasuringHook = function() { %s };
86    """ % (start_js, stop_js))
87