1 files changed, 74 insertions, 0 deletions
diff --git a/catapult/telemetry/telemetry/internal/actions/pinch.py b/catapult/telemetry/telemetry/internal/actions/pinch.py
new file mode 100644
index 00000000..e3debe6b
--- /dev/null
+++ b/catapult/telemetry/telemetry/internal/actions/pinch.py
@@ -0,0 +1,74 @@
+# 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)