| // Copyright (c) 2012 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 BASE_MESSAGE_LOOP_MESSAGE_PUMP_GTK_H_ |
| #define BASE_MESSAGE_LOOP_MESSAGE_PUMP_GTK_H_ |
| |
| #include "base/message_loop/message_pump_glib.h" |
| |
| typedef union _GdkEvent GdkEvent; |
| typedef struct _XDisplay Display; |
| |
| namespace base { |
| |
| // The documentation for this class is in message_pump_glib.h |
| class MessagePumpGdkObserver { |
| public: |
| // This method is called before processing a message. |
| virtual void WillProcessEvent(GdkEvent* event) = 0; |
| |
| // This method is called after processing a message. |
| virtual void DidProcessEvent(GdkEvent* event) = 0; |
| |
| protected: |
| virtual ~MessagePumpGdkObserver() {} |
| }; |
| |
| // This class implements a message-pump for dispatching GTK events. |
| class BASE_EXPORT MessagePumpGtk : public MessagePumpGlib { |
| public: |
| MessagePumpGtk(); |
| virtual ~MessagePumpGtk(); |
| |
| // Dispatch an available GdkEvent. Essentially this allows a subclass to do |
| // some task before/after calling the default handler (EventDispatcher). |
| void DispatchEvents(GdkEvent* event); |
| |
| // Returns default X Display. |
| static Display* GetDefaultXDisplay(); |
| |
| // Adds an Observer, which will start receiving notifications immediately. |
| void AddObserver(MessagePumpGdkObserver* observer); |
| |
| // Removes an Observer. It is safe to call this method while an Observer is |
| // receiving a notification callback. |
| void RemoveObserver(MessagePumpGdkObserver* observer); |
| |
| private: |
| // Invoked from EventDispatcher. Notifies all observers we're about to |
| // process an event. |
| void WillProcessEvent(GdkEvent* event); |
| |
| // Invoked from EventDispatcher. Notifies all observers we processed an |
| // event. |
| void DidProcessEvent(GdkEvent* event); |
| |
| // Callback prior to gdk dispatching an event. |
| static void EventDispatcher(GdkEvent* event, void* data); |
| |
| // List of observers. |
| ObserverList<MessagePumpGdkObserver> observers_; |
| |
| DISALLOW_COPY_AND_ASSIGN(MessagePumpGtk); |
| }; |
| |
| typedef MessagePumpGtk MessagePumpForUI; |
| |
| } // namespace base |
| |
| #endif // BASE_MESSAGE_LOOP_MESSAGE_PUMP_GTK_H_ |