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# 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.
from telemetry.internal.actions import page_action
from telemetry.internal.actions import utils
from telemetry.util import js_template
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):
utils.InjectJavaScript(tab, 'gesture_common.js')
utils.InjectJavaScript(tab, 'pinch.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')
tab.ExecuteJavaScript("""
window.__pinchActionDone = false;
window.__pinchAction = new __PinchAction(function() {
window.__pinchActionDone = true;
});""")
@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 = js_template.Render('''
function(element, info) {
if (!element) {
throw Error('Cannot find element: ' + info);
}
window.__pinchAction.start({
element: element,
left_anchor_ratio: {{ left_anchor_ratio }},
top_anchor_ratio: {{ top_anchor_ratio }},
scale_factor: {{ scale_factor }},
speed: {{ speed }}
});
}''',
left_anchor_ratio=self._left_anchor_ratio,
top_anchor_ratio=self._top_anchor_ratio,
scale_factor=scale_factor,
speed=self._speed)
page_action.EvaluateCallbackWithElement(
tab, code, selector=self._selector, text=self._text,
element_function=self._element_function)
tab.WaitForJavaScriptExpression('window.__pinchActionDone', 60)
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