| # Copyright 2013 The Chromium Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| import os |
| |
| from telemetry.internal.actions import page_action |
| |
| |
| class PinchAction(page_action.PageAction): |
| def __init__(self, selector=None, text=None, element_function=None, |
| left_anchor_ratio=0.5, top_anchor_ratio=0.5, |
| scale_factor=None, speed_in_pixels_per_second=800, |
| synthetic_gesture_source=page_action.GESTURE_SOURCE_DEFAULT): |
| super(PinchAction, self).__init__() |
| self._selector = selector |
| self._text = text |
| self._element_function = element_function |
| self._left_anchor_ratio = left_anchor_ratio |
| self._top_anchor_ratio = top_anchor_ratio |
| self._scale_factor = scale_factor |
| self._speed = speed_in_pixels_per_second |
| self._synthetic_gesture_source = ('chrome.gpuBenchmarking.%s_INPUT' % |
| synthetic_gesture_source) |
| |
| if (self._selector is None and self._text is None and |
| self._element_function is None): |
| self._element_function = 'document.body' |
| |
| def WillRunAction(self, tab): |
| for js_file in ['gesture_common.js', 'pinch.js']: |
| with open(os.path.join(os.path.dirname(__file__), js_file)) as f: |
| js = f.read() |
| tab.ExecuteJavaScript(js) |
| |
| # Fail if browser doesn't support synthetic pinch gestures. |
| if not tab.EvaluateJavaScript('window.__PinchAction_SupportedByBrowser()'): |
| raise page_action.PageActionNotSupported( |
| 'Synthetic pinch not supported for this browser') |
| |
| done_callback = 'function() { window.__pinchActionDone = true; }' |
| tab.ExecuteJavaScript(""" |
| window.__pinchActionDone = false; |
| window.__pinchAction = new __PinchAction(%s);""" |
| % done_callback) |
| |
| @staticmethod |
| def _GetDefaultScaleFactorForPage(tab): |
| current_scale_factor = tab.EvaluateJavaScript( |
| 'window.outerWidth / window.innerWidth') |
| return 3.0 / current_scale_factor |
| |
| def RunAction(self, tab): |
| scale_factor = (self._scale_factor if self._scale_factor else |
| PinchAction._GetDefaultScaleFactorForPage(tab)) |
| code = ''' |
| function(element, info) { |
| if (!element) { |
| throw Error('Cannot find element: ' + info); |
| } |
| window.__pinchAction.start({ |
| element: element, |
| left_anchor_ratio: %s, |
| top_anchor_ratio: %s, |
| scale_factor: %s, |
| speed: %s |
| }); |
| }''' % (self._left_anchor_ratio, |
| self._top_anchor_ratio, |
| scale_factor, |
| self._speed) |
| page_action.EvaluateCallbackWithElement( |
| tab, code, selector=self._selector, text=self._text, |
| element_function=self._element_function) |
| tab.WaitForJavaScriptExpression('window.__pinchActionDone', 60) |