Attachment #8536252 for bug #920036

Attachment #8536252: Part 1 (WIP) - Introduce InputEventContext for bug #920036

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+  Link Here
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#include "InputEventContext.h"
+namespace mozilla {
+namespace layers {
+ScrollableLayerGuid InputEventContext::sGuid;
+uint64_t InputEventContext::sBlockId = 0;
+/*static*/ ScrollableLayerGuid
+InputEventContext::GetTargetLayerGuid()
+{
+  return sGuid;
+}
+/*static*/ uint64_t
+InputEventContext::GetInputBlockId()
+{
+  return sBlockId;
+}
+InputEventContext::InputEventContext(const ScrollableLayerGuid& aGuid,
+                                     const uint64_t& aBlockId)
+  : mOldGuid(sGuid)
+  , mOldBlockId(sBlockId)
+{
+  sGuid = aGuid;
+  sBlockId = aBlockId;
+}
+InputEventContext::~InputEventContext()
+{
+  sGuid = mOldGuid;
+  sBlockId = mOldBlockId;
+}
+}
+}

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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#ifndef mozilla_layers_InputEventContext_h
+#define mozilla_layers_InputEventContext_h
+#include "FrameMetrics.h"
+namespace mozilla {
+namespace layers {
+/* This class contains some helper methods that facilitate implementing the
+   GeckoContentController callback interface required by the AsyncPanZoomController.
+   Since different platforms need to implement this interface in similar-but-
+   not-quite-the-same ways, this utility class provides some helpful methods
+   to hold code that can be shared across the different platform implementations.
+ */
+class MOZ_STACK_CLASS InputEventContext
+{
+private:
+  static ScrollableLayerGuid sGuid;
+  static uint64_t sBlockId;
+public:
+  static ScrollableLayerGuid GetTargetLayerGuid();
+  static uint64_t GetInputBlockId();
+  InputEventContext(const ScrollableLayerGuid& aGuid,
+                    const uint64_t& aBlockId);
+  ~InputEventContext();
+private:
+  ScrollableLayerGuid mOldGuid;
+  uint64_t mOldBlockId;
+};
+}
+}
+#endif /* mozilla_layers_InputEventContext_h */





    'apz/public/GeckoContentController.h',
    # exporting things from apz/src is temporary until we extract a
    # proper interface for the code there
    'apz/src/APZCTreeManager.h',
    'apz/testutil/APZTestData.h',
    'apz/util/ActiveElementManager.h',
    'apz/util/APZCCallbackHelper.h',
    'apz/util/ChromeProcessController.h',
    'apz/util/InputEventContext.h',
    'AtomicRefCountedWithFinalize.h',
    'AxisPhysicsModel.h',
    'AxisPhysicsMSDModel.h',
    'basic/BasicCompositor.h',
    'basic/MacIOSurfaceTextureHostBasic.h',
    'basic/TextureHostBasic.h',
    'client/CanvasClient.h',
    'client/CompositableClient.h',

    'apz/src/InputBlockState.cpp',
    'apz/src/InputQueue.cpp',
    'apz/src/OverscrollHandoffState.cpp',
    'apz/src/TaskThrottler.cpp',
    'apz/testutil/APZTestData.cpp',
    'apz/util/ActiveElementManager.cpp',
    'apz/util/APZCCallbackHelper.cpp',
    'apz/util/ChromeProcessController.cpp',
    'apz/util/InputEventContext.cpp',
    'AxisPhysicsModel.cpp',
    'AxisPhysicsMSDModel.cpp',
    'basic/BasicCanvasLayer.cpp',
    'basic/BasicColorLayer.cpp',
    'basic/BasicCompositor.cpp',
    'basic/BasicContainerLayer.cpp',
    'basic/BasicImages.cpp',
    'basic/BasicLayerManager.cpp',

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