1 // Copyright (c) 2012 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 BASE_MESSAGE_LOOP_MESSAGE_PUMP_GTK_H_ 6 #define BASE_MESSAGE_LOOP_MESSAGE_PUMP_GTK_H_ 7 8 #include "base/message_loop/message_pump_glib.h" 9 10 typedef union _GdkEvent GdkEvent; 11 typedef struct _XDisplay Display; 12 13 namespace base { 14 15 // The documentation for this class is in message_pump_glib.h 16 class MessagePumpGdkObserver { 17 public: 18 // This method is called before processing a message. 19 virtual void WillProcessEvent(GdkEvent* event) = 0; 20 21 // This method is called after processing a message. 22 virtual void DidProcessEvent(GdkEvent* event) = 0; 23 24 protected: 25 virtual ~MessagePumpGdkObserver() {} 26 }; 27 28 // This class implements a message-pump for dispatching GTK events. 29 class BASE_EXPORT MessagePumpGtk : public MessagePumpGlib { 30 public: 31 MessagePumpGtk(); 32 virtual ~MessagePumpGtk(); 33 34 // Dispatch an available GdkEvent. Essentially this allows a subclass to do 35 // some task before/after calling the default handler (EventDispatcher). 36 void DispatchEvents(GdkEvent* event); 37 38 // Returns default X Display. 39 static Display* GetDefaultXDisplay(); 40 41 // Adds an Observer, which will start receiving notifications immediately. 42 void AddObserver(MessagePumpGdkObserver* observer); 43 44 // Removes an Observer. It is safe to call this method while an Observer is 45 // receiving a notification callback. 46 void RemoveObserver(MessagePumpGdkObserver* observer); 47 48 private: 49 // Invoked from EventDispatcher. Notifies all observers we're about to 50 // process an event. 51 void WillProcessEvent(GdkEvent* event); 52 53 // Invoked from EventDispatcher. Notifies all observers we processed an 54 // event. 55 void DidProcessEvent(GdkEvent* event); 56 57 // Callback prior to gdk dispatching an event. 58 static void EventDispatcher(GdkEvent* event, void* data); 59 60 // List of observers. 61 ObserverList<MessagePumpGdkObserver> observers_; 62 63 DISALLOW_COPY_AND_ASSIGN(MessagePumpGtk); 64 }; 65 66 typedef MessagePumpGtk MessagePumpForUI; 67 68 } // namespace base 69 70 #endif // BASE_MESSAGE_LOOP_MESSAGE_PUMP_GTK_H_ 71
