1 files changed, 141 insertions, 0 deletions
diff --git a/chromium/cc/input/input_handler.h b/chromium/cc/input/input_handler.h
new file mode 100644
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+++ b/chromium/cc/input/input_handler.h
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+// Copyright 2011 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.
+
+#ifndef CC_INPUT_INPUT_HANDLER_H_
+#define CC_INPUT_INPUT_HANDLER_H_
+
+#include "base/basictypes.h"
+#include "base/time/time.h"
+#include "cc/base/cc_export.h"
+#include "cc/input/scrollbar.h"
+
+namespace gfx {
+class Point;
+class PointF;
+class Vector2d;
+class Vector2dF;
+}
+
+namespace ui { struct LatencyInfo; }
+
+namespace cc {
+
+class LayerScrollOffsetDelegate;
+
+struct DidOverscrollParams {
+  gfx::Vector2dF accumulated_overscroll;
+  gfx::Vector2dF latest_overscroll_delta;
+  gfx::Vector2dF current_fling_velocity;
+};
+
+class CC_EXPORT InputHandlerClient {
+ public:
+  virtual ~InputHandlerClient() {}
+
+  virtual void WillShutdown() = 0;
+  virtual void Animate(base::TimeTicks time) = 0;
+  virtual void MainThreadHasStoppedFlinging() = 0;
+
+  // Called when scroll deltas reaching the root scrolling layer go unused.
+  // The accumulated overscroll is scoped by the most recent call to
+  // InputHandler::ScrollBegin.
+  virtual void DidOverscroll(const DidOverscrollParams& params) = 0;
+
+ protected:
+  InputHandlerClient() {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(InputHandlerClient);
+};
+
+// The InputHandler is a way for the embedders to interact with the impl thread
+// side of the compositor implementation. There is one InputHandler per
+// LayerTreeHost. To use the input handler, implement the InputHanderClient
+// interface and bind it to the handler on the compositor thread.
+class CC_EXPORT InputHandler {
+ public:
+  enum ScrollStatus { ScrollOnMainThread, ScrollStarted, ScrollIgnored };
+  enum ScrollInputType { Gesture, Wheel, NonBubblingGesture };
+
+  // Binds a client to this handler to receive notifications. Only one client
+  // can be bound to an InputHandler. The client must live at least until the
+  // handler calls WillShutdown() on the client.
+  virtual void BindToClient(InputHandlerClient* client) = 0;
+
+  // Selects a layer to be scrolled at a given point in viewport (logical
+  // pixel) coordinates. Returns ScrollStarted if the layer at the coordinates
+  // can be scrolled, ScrollOnMainThread if the scroll event should instead be
+  // delegated to the main thread, or ScrollIgnored if there is nothing to be
+  // scrolled at the given coordinates.
+  virtual ScrollStatus ScrollBegin(gfx::Point viewport_point,
+                                   ScrollInputType type) = 0;
+
+  // Scroll the selected layer starting at the given position. If the scroll
+  // type given to ScrollBegin was a gesture, then the scroll point and delta
+  // should be in viewport (logical pixel) coordinates. Otherwise they are in
+  // scrolling layer's (logical pixel) space. If there is no room to move the
+  // layer in the requested direction, its first ancestor layer that can be
+  // scrolled will be moved instead. If no layer can be moved in the requested
+  // direction at all, then false is returned. If any layer is moved, then
+  // true is returned.
+  // If the scroll delta hits the root layer, and the layer can no longer move,
+  // the root overscroll accumulated within this ScrollBegin() scope is reported
+  // to the client.
+  // Should only be called if ScrollBegin() returned ScrollStarted.
+  virtual bool ScrollBy(gfx::Point viewport_point,
+                        gfx::Vector2dF scroll_delta) = 0;
+
+  virtual bool ScrollVerticallyByPage(
+      gfx::Point viewport_point,
+      ScrollDirection direction) = 0;
+
+  // Returns ScrollStarted if a layer was being actively being scrolled,
+  // ScrollIgnored if not.
+  virtual ScrollStatus FlingScrollBegin() = 0;
+
+  virtual void NotifyCurrentFlingVelocity(gfx::Vector2dF velocity) = 0;
+
+  // Stop scrolling the selected layer. Should only be called if ScrollBegin()
+  // returned ScrollStarted.
+  virtual void ScrollEnd() = 0;
+
+  virtual void SetRootLayerScrollOffsetDelegate(
+      LayerScrollOffsetDelegate* root_layer_scroll_offset_delegate) = 0;
+
+  // Called when the value returned by
+  // LayerScrollOffsetDelegate.GetTotalScrollOffset has changed for reasons
+  // other than a SetTotalScrollOffset call.
+  // NOTE: This should only called after a valid delegate was set via a call to
+  // SetRootLayerScrollOffsetDelegate.
+  virtual void OnRootLayerDelegatedScrollOffsetChanged() = 0;
+
+  virtual void PinchGestureBegin() = 0;
+  virtual void PinchGestureUpdate(float magnify_delta, gfx::Point anchor) = 0;
+  virtual void PinchGestureEnd() = 0;
+
+  virtual void StartPageScaleAnimation(gfx::Vector2d target_offset,
+                                       bool anchor_point,
+                                       float page_scale,
+                                       base::TimeTicks start_time,
+                                       base::TimeDelta duration) = 0;
+
+  // Request another callback to InputHandlerClient::Animate().
+  virtual void ScheduleAnimation() = 0;
+
+  virtual bool HaveTouchEventHandlersAt(gfx::Point viewport_point) = 0;
+
+  virtual void SetLatencyInfoForInputEvent(
+      const ui::LatencyInfo& latency_info) = 0;
+
+ protected:
+  InputHandler() {}
+  virtual ~InputHandler() {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(InputHandler);
+};
+
+}  // namespace cc
+
+#endif  // CC_INPUT_INPUT_HANDLER_H_