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Side by Side Diff: base/message_loop/message_pump_gtk.h

Issue 23537016: gtk: Some code cleanup for the message-pump. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: . Created 7 years, 3 months ago
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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 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 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #ifndef BASE_MESSAGE_LOOP_MESSAGE_PUMP_GTK_H_ 5 #ifndef BASE_MESSAGE_LOOP_MESSAGE_PUMP_GTK_H_
6 #define BASE_MESSAGE_LOOP_MESSAGE_PUMP_GTK_H_ 6 #define BASE_MESSAGE_LOOP_MESSAGE_PUMP_GTK_H_
7 7
8 #include "base/message_loop/message_pump_glib.h" 8 #include "base/message_loop/message_pump_glib.h"
9 9
10 typedef union _GdkEvent GdkEvent; 10 typedef union _GdkEvent GdkEvent;
11 typedef struct _XDisplay Display; 11 typedef struct _XDisplay Display;
12 12
13 namespace base { 13 namespace base {
14 14
15 // The documentation for this class is in message_pump_glib.h 15 // The documentation for this class is in message_pump_glib.h
16 class MessagePumpObserver { 16 class MessagePumpGdkObserver {
17 public: 17 public:
18 // This method is called before processing a message. 18 // This method is called before processing a message.
19 virtual void WillProcessEvent(GdkEvent* event) = 0; 19 virtual void WillProcessEvent(GdkEvent* event) = 0;
20 20
21 // This method is called after processing a message. 21 // This method is called after processing a message.
22 virtual void DidProcessEvent(GdkEvent* event) = 0; 22 virtual void DidProcessEvent(GdkEvent* event) = 0;
23 23
24 protected: 24 protected:
25 virtual ~MessagePumpObserver() {} 25 virtual ~MessagePumpGdkObserver() {}
26 };
27
28 // The documentation for this class is in message_pump_glib.h
29 //
30 // The nested loop is exited by either posting a quit, or returning false
31 // from Dispatch.
32 class MessagePumpDispatcher {
33 public:
34 // Dispatches the event. If true is returned processing continues as
35 // normal. If false is returned, the nested loop exits immediately.
36 virtual bool Dispatch(GdkEvent* event) = 0;
37
38 protected:
39 virtual ~MessagePumpDispatcher() {}
40 }; 26 };
41 27
42 // This class implements a message-pump for dispatching GTK events. 28 // This class implements a message-pump for dispatching GTK events.
43 class BASE_EXPORT MessagePumpGtk : public MessagePumpGlib { 29 class BASE_EXPORT MessagePumpGtk : public MessagePumpGlib {
44 public: 30 public:
45 MessagePumpGtk(); 31 MessagePumpGtk();
46 virtual ~MessagePumpGtk(); 32 virtual ~MessagePumpGtk();
47 33
48 // Dispatch an available GdkEvent. Essentially this allows a subclass to do 34 // Dispatch an available GdkEvent. Essentially this allows a subclass to do
49 // some task before/after calling the default handler (EventDispatcher). 35 // some task before/after calling the default handler (EventDispatcher).
50 void DispatchEvents(GdkEvent* event); 36 void DispatchEvents(GdkEvent* event);
51 37
52 // Returns default X Display. 38 // Returns default X Display.
53 static Display* GetDefaultXDisplay(); 39 static Display* GetDefaultXDisplay();
54 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
55 private: 48 private:
56 // Invoked from EventDispatcher. Notifies all observers we're about to 49 // Invoked from EventDispatcher. Notifies all observers we're about to
57 // process an event. 50 // process an event.
58 void WillProcessEvent(GdkEvent* event); 51 void WillProcessEvent(GdkEvent* event);
59 52
60 // Invoked from EventDispatcher. Notifies all observers we processed an 53 // Invoked from EventDispatcher. Notifies all observers we processed an
61 // event. 54 // event.
62 void DidProcessEvent(GdkEvent* event); 55 void DidProcessEvent(GdkEvent* event);
63 56
64 // Callback prior to gdk dispatching an event. 57 // Callback prior to gdk dispatching an event.
65 static void EventDispatcher(GdkEvent* event, void* data); 58 static void EventDispatcher(GdkEvent* event, void* data);
66 59
60 // List of observers.
61 ObserverList<MessagePumpGdkObserver> observers_;
62
67 DISALLOW_COPY_AND_ASSIGN(MessagePumpGtk); 63 DISALLOW_COPY_AND_ASSIGN(MessagePumpGtk);
68 }; 64 };
69 65
70 typedef MessagePumpGtk MessagePumpForUI; 66 typedef MessagePumpGtk MessagePumpForUI;
71 67
72 } // namespace base 68 } // namespace base
73 69
74 #endif // BASE_MESSAGE_LOOP_MESSAGE_PUMP_GTK_H_ 70 #endif // BASE_MESSAGE_LOOP_MESSAGE_PUMP_GTK_H_
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