src/tools/telemetry/telemetry/page/actions/pinch.py

   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.
   4 import os
   5
   6 from telemetry.page.actions.gesture_action import GestureAction
   7 from telemetry.page.actions import page_action
   8
   9 class PinchAction(GestureAction):
  10   def __init__(self, attributes=None):
  11     super(PinchAction, self).__init__(attributes)
  12     self._SetTimelineMarkerBaseName('PinchAction::RunAction')
  13
  14   def WillRunAction(self, page, tab):
  15     for js_file in ['gesture_common.js', 'pinch.js']:
  16       with open(os.path.join(os.path.dirname(__file__), js_file)) as f:
  17         js = f.read()
  18         tab.ExecuteJavaScript(js)
  19
  20     # Fail if browser doesn't support synthetic pinch gestures.
  21     if not tab.EvaluateJavaScript('window.__PinchAction_SupportedByBrowser()'):
  22       raise page_action.PageActionNotSupported(
  23           'Synthetic pinch not supported for this browser')
  24
  25     if (GestureAction.GetGestureSourceTypeFromOptions(tab) ==
  26         'chrome.gpuBenchmarking.MOUSE_INPUT'):
  27       raise page_action.PageActionNotSupported(
  28           'Pinch page action does not support mouse input')
  29
  30     done_callback = 'function() { window.__pinchActionDone = true; }'
  31     tab.ExecuteJavaScript("""
  32         window.__pinchActionDone = false;
  33         window.__pinchAction = new __PinchAction(%s);"""
  34         % done_callback)
  35
  36   def RunGesture(self, page, tab, previous_action):
  37     zoom_in = True
  38     if hasattr(self, 'zoom_in'):
  39       zoom_in = self.zoom_in
  40
  41     pixels_to_move = 4000
  42     if hasattr(self, 'pixels_to_move'):
  43       pixels_to_move = self.pixels_to_move
  44
  45     tab.ExecuteJavaScript('window.__pinchAction.start(%s, %f)'
  46                           % ("true" if zoom_in else "false", pixels_to_move))
  47
  48     tab.WaitForJavaScriptExpression('window.__pinchActionDone', 60)
  49
  50   def CanBeBound(self):
  51     return True
  52
  53   def BindMeasurementJavaScript(self, tab, start_js, stop_js):
  54     # Make the pinch action start and stop measurement automatically.
  55     tab.ExecuteJavaScript("""
  56         window.__pinchAction.beginMeasuringHook = function() { %s };
  57         window.__pinchAction.endMeasuringHook = function() { %s };
  58     """ % (start_js, stop_js))