| # Copyright 2014 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. |
| |
| from telemetry.internal.actions import page_action |
| from telemetry.internal.actions import utils |
| from telemetry.util import js_template |
| |
| |
| class ScrollBounceAction(page_action.PageAction): |
| def __init__(self, selector=None, text=None, element_function=None, |
| left_start_ratio=0.5, top_start_ratio=0.5, |
| direction='down', distance=100, |
| overscroll=10, repeat_count=10, |
| speed_in_pixels_per_second=400, |
| synthetic_gesture_source=page_action.GESTURE_SOURCE_DEFAULT): |
| super(ScrollBounceAction, self).__init__() |
| if direction not in ['down', 'up', 'left', 'right']: |
| raise page_action.PageActionNotSupported( |
| 'Invalid scroll direction: %s' % self.direction) |
| self._selector = selector |
| self._text = text |
| self._element_function = element_function |
| self._left_start_ratio = left_start_ratio |
| self._top_start_ratio = top_start_ratio |
| # Should be big enough to do more than just hide the URL bar. |
| self._distance = distance |
| self._direction = direction |
| # This needs to be < height / repeat_count so we don't walk off the screen. |
| # We also probably don't want to spend more than a couple frames in |
| # overscroll since it may mask any synthetic delays. |
| self._overscroll = overscroll |
| # It's the transitions we really want to stress, make this big. |
| self._repeat_count = repeat_count |
| # 7 pixels per frame should be plenty of frames. |
| 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.scrollingElement || document.body)' |
| |
| def WillRunAction(self, tab): |
| utils.InjectJavaScript(tab, 'gesture_common.js') |
| utils.InjectJavaScript(tab, 'scroll_bounce.js') |
| |
| # Fail if browser doesn't support synthetic scroll bounce gestures. |
| if not tab.EvaluateJavaScript( |
| 'window.__ScrollBounceAction_SupportedByBrowser()'): |
| raise page_action.PageActionNotSupported( |
| 'Synthetic scroll bounce not supported for this browser') |
| |
| # Fail if we can't send touch events (bouncing is really only |
| # interesting for touch) |
| if not page_action.IsGestureSourceTypeSupported(tab, 'touch'): |
| raise page_action.PageActionNotSupported( |
| 'Touch scroll not supported for this browser') |
| |
| if (self._synthetic_gesture_source == |
| 'chrome.gpuBenchmarking.MOUSE_INPUT'): |
| raise page_action.PageActionNotSupported( |
| 'ScrollBounce page action does not support mouse input') |
| |
| tab.ExecuteJavaScript(""" |
| window.__scrollBounceActionDone = false; |
| window.__scrollBounceAction = new __ScrollBounceAction( |
| function() { window.__scrollBounceActionDone = true; });""") |
| |
| def RunAction(self, tab): |
| code = js_template.Render(''' |
| function(element, info) { |
| if (!element) { |
| throw Error('Cannot find element: ' + info); |
| } |
| window.__scrollBounceAction.start({ |
| element: element, |
| left_start_ratio: {{ left_start_ratio }}, |
| top_start_ratio: {{ top_start_ratio }}, |
| direction: {{ direction }}, |
| distance: {{ distance }}, |
| overscroll: {{ overscroll }}, |
| repeat_count: {{ repeat_count }}, |
| speed: {{ speed }} |
| }); |
| }''', |
| left_start_ratio=self._left_start_ratio, |
| top_start_ratio=self._top_start_ratio, |
| direction=self._direction, |
| distance=self._distance, |
| overscroll=self._overscroll, |
| repeat_count=self._repeat_count, |
| speed=self._speed) |
| page_action.EvaluateCallbackWithElement( |
| tab, code, selector=self._selector, text=self._text, |
| element_function=self._element_function) |
| tab.WaitForJavaScriptCondition( |
| 'window.__scrollBounceActionDone', timeout=60) |
