1 // Copyright 2013 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef CONTENT_BROWSER_RENDERER_HOST_INPUT_INPUT_ROUTER_CLIENT_H_ 6 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_INPUT_ROUTER_CLIENT_H_ 7 8 #include "content/browser/renderer_host/event_with_latency_info.h" 9 #include "content/common/content_export.h" 10 #include "content/common/input/input_event_ack_state.h" 11 #include "content/public/browser/native_web_keyboard_event.h" 12 #include "third_party/WebKit/public/web/WebInputEvent.h" 13 14 namespace ui { 15 struct LatencyInfo; 16 } 17 18 namespace content { 19 20 struct DidOverscrollParams; 21 22 class CONTENT_EXPORT InputRouterClient { 23 public: ~InputRouterClient()24 virtual ~InputRouterClient() {} 25 26 // Called just prior to events being sent to the renderer, giving the client 27 // a chance to perform in-process event filtering. 28 // The returned disposition will yield the following behavior: 29 // * |NOT_CONSUMED| will result in |input_event| being sent as usual. 30 // * |CONSUMED| or |NO_CONSUMER_EXISTS| will trigger the appropriate ack. 31 // * |UNKNOWN| will result in |input_event| being dropped. 32 virtual InputEventAckState FilterInputEvent( 33 const blink::WebInputEvent& input_event, 34 const ui::LatencyInfo& latency_info) = 0; 35 36 // Called each time a WebInputEvent IPC is sent. 37 virtual void IncrementInFlightEventCount() = 0; 38 39 // Called each time a WebInputEvent ACK IPC is received. 40 virtual void DecrementInFlightEventCount() = 0; 41 42 // Called when the renderer notifies that it has touch event handlers. 43 virtual void OnHasTouchEventHandlers(bool has_handlers) = 0; 44 45 // Certain router implementations require periodic flushing of queued events. 46 // When this method is called, the client should ensure a timely call, either 47 // synchronous or asynchronous, of |Flush| on the InputRouter. 48 virtual void SetNeedsFlush() = 0; 49 50 // Called when the router has finished flushing all events queued at the time 51 // of the call to Flush. The call will typically be asynchronous with 52 // respect to the call to |Flush| on the InputRouter. 53 virtual void DidFlush() = 0; 54 55 // Called when the router has received an overscroll notification from the 56 // renderer. 57 virtual void DidOverscroll(const DidOverscrollParams& params) = 0; 58 }; 59 60 } // namespace content 61 62 #endif // CONTENT_BROWSER_RENDERER_HOST_INPUT_INPUT_ROUTER_CLIENT_H_ 63