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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 CONTENT_BROWSER_RENDERER_HOST_INPUT_INPUT_ROUTER_CLIENT_H_
#define CONTENT_BROWSER_RENDERER_HOST_INPUT_INPUT_ROUTER_CLIENT_H_
#include "content/browser/renderer_host/event_with_latency_info.h"
#include "content/common/content_export.h"
#include "content/common/input/input_event_ack_state.h"
#include "content/public/browser/native_web_keyboard_event.h"
#include "third_party/WebKit/public/web/WebInputEvent.h"
namespace ui {
struct LatencyInfo;
}
namespace content {
struct DidOverscrollParams;
class CONTENT_EXPORT InputRouterClient {
public:
virtual ~InputRouterClient() {}
// Called just prior to events being sent to the renderer, giving the client
// a chance to perform in-process event filtering.
// The returned disposition will yield the following behavior:
// * |NOT_CONSUMED| will result in |input_event| being sent as usual.
// * |CONSUMED| or |NO_CONSUMER_EXISTS| will trigger the appropriate ack.
// * |UNKNOWN| will result in |input_event| being dropped.
virtual InputEventAckState FilterInputEvent(
const blink::WebInputEvent& input_event,
const ui::LatencyInfo& latency_info) = 0;
// Called each time a WebInputEvent IPC is sent.
virtual void IncrementInFlightEventCount() = 0;
// Called each time a WebInputEvent ACK IPC is received.
virtual void DecrementInFlightEventCount() = 0;
// Called when the renderer notifies that it has touch event handlers.
virtual void OnHasTouchEventHandlers(bool has_handlers) = 0;
// Certain router implementations require periodic flushing of queued events.
// When this method is called, the client should ensure a timely call, either
// synchronous or asynchronous, of |Flush| on the InputRouter.
virtual void SetNeedsFlush() = 0;
// Called when the router has finished flushing all events queued at the time
// of the call to Flush. The call will typically be asynchronous with
// respect to the call to |Flush| on the InputRouter.
virtual void DidFlush() = 0;
// Called when the router has received an overscroll notification from the
// renderer.
virtual void DidOverscroll(const DidOverscrollParams& params) = 0;
};
} // namespace content
#endif // CONTENT_BROWSER_RENDERER_HOST_INPUT_INPUT_ROUTER_CLIENT_H_
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