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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.
#ifndef UI_EVENTS_BLINK_INPUT_HANDLER_PROXY_CLIENT_H_
#define UI_EVENTS_BLINK_INPUT_HANDLER_PROXY_CLIENT_H_
#include "ui/events/blink/web_input_event_traits.h"
namespace blink {
class WebGestureCurve;
struct WebActiveWheelFlingParameters;
struct WebFloatPoint;
struct WebSize;
}
namespace ui {
// All callbacks invoked from the compositor thread.
class InputHandlerProxyClient {
public:
// Called just before the InputHandlerProxy shuts down.
virtual void WillShutdown() = 0;
// Transfers an active wheel fling animation initiated by a previously
// handled input event out to the client.
virtual void TransferActiveWheelFlingAnimation(
const blink::WebActiveWheelFlingParameters& params) = 0;
// Dispatch a non blocking event to the main thread. This is used when a
// gesture fling from a touchpad is processed and the target only has
// passive event listeners. If the target has blocking event listeners
// |TransferActiveWheelFlingAnimation| will be used instead.
virtual void DispatchNonBlockingEventToMainThread(
WebScopedInputEvent event,
const ui::LatencyInfo& latency_info) = 0;
// Creates a new fling animation curve instance for device |device_source|
// with |velocity| and already scrolled |cumulative_scroll| pixels.
virtual std::unique_ptr<blink::WebGestureCurve> CreateFlingAnimationCurve(
blink::WebGestureDevice device_source,
const blink::WebFloatPoint& velocity,
const blink::WebSize& cumulative_scroll) = 0;
// |HandleInputEvent/WithLatencyInfo| will respond to overscroll by calling
// the passed in callback.
// Otherwise |DidOverscroll| will be fired.
virtual void DidOverscroll(
const gfx::Vector2dF& accumulated_overscroll,
const gfx::Vector2dF& latest_overscroll_delta,
const gfx::Vector2dF& current_fling_velocity,
const gfx::PointF& causal_event_viewport_point) = 0;
virtual void DidStopFlinging() = 0;
virtual void DidAnimateForInput() = 0;
// Used to send a GSB to the main thread when the wheel scroll latching is
// enabled and the scrolling should switch to the main thread.
virtual void GenerateScrollBeginAndSendToMainThread(
const blink::WebGestureEvent& update_event) = 0;
protected:
virtual ~InputHandlerProxyClient() {}
};
} // namespace ui
#endif // UI_EVENTS_BLINK_INPUT_HANDLER_PROXY_CLIENT_H_