1 /* 2 * Copyright 2005-2006, Haiku, Inc. All Rights Reserved. 3 * Distributed under the terms of the MIT License. 4 * 5 * Authors: 6 * Axel Dörfler, axeld@pinc-software.de 7 */ 8 #ifndef EVENT_DISPATCHER_H 9 #define EVENT_DISPATCHER_H 10 11 12 #include <Locker.h> 13 #include <Message.h> 14 #include <MessageFilter.h> 15 #include <Messenger.h> 16 #include <ObjectList.h> 17 18 19 class Desktop; 20 class EventStream; 21 class HWInterface; 22 class ServerBitmap; 23 24 struct event_listener; 25 26 27 class EventTarget { 28 public: 29 EventTarget(); 30 ~EventTarget(); 31 32 void SetTo(const BMessenger& messenger); 33 BMessenger& Messenger() { return fMessenger; } 34 35 event_listener* FindListener(int32 token, int32* _index = NULL); 36 bool AddListener(int32 token, uint32 eventMask, uint32 options, 37 bool temporary); 38 void RemoveListener(event_listener* listener, bool temporary); 39 40 bool RemoveListener(int32 token); 41 bool RemoveTemporaryListener(int32 token); 42 void RemoveTemporaryListeners(); 43 44 bool IsEmpty() const { return fListeners.IsEmpty(); } 45 46 int32 CountListeners() const { return fListeners.CountItems(); } 47 event_listener* ListenerAt(int32 index) const 48 { return fListeners.ItemAt(index); } 49 50 private: 51 bool _RemoveTemporaryListener(event_listener* listener, int32 index); 52 53 BObjectList<event_listener> fListeners; 54 BMessenger fMessenger; 55 }; 56 57 class EventFilter { 58 public: 59 virtual ~EventFilter() {}; 60 virtual filter_result Filter(BMessage* event, EventTarget** _target, 61 int32* _viewToken = NULL, BMessage* latestMouseMoved = NULL) = 0; 62 virtual void RemoveTarget(EventTarget* target); 63 }; 64 65 class EventDispatcher : public BLocker { 66 public: 67 EventDispatcher(); 68 ~EventDispatcher(); 69 70 status_t SetTo(EventStream* stream); 71 status_t InitCheck(); 72 73 void RemoveTarget(EventTarget& target); 74 75 bool AddListener(EventTarget& target, int32 token, 76 uint32 eventMask, uint32 options); 77 bool AddTemporaryListener(EventTarget& target, 78 int32 token, uint32 eventMask, uint32 options); 79 void RemoveListener(EventTarget& target, int32 token); 80 void RemoveTemporaryListener(EventTarget& target, int32 token); 81 82 void SetMouseFilter(EventFilter* filter); 83 void SetKeyboardFilter(EventFilter* filter); 84 85 void GetMouse(BPoint& where, int32& buttons); 86 void SendFakeMouseMoved(EventTarget& target, int32 viewToken); 87 88 bool HasCursorThread(); 89 void SetHWInterface(HWInterface* interface); 90 91 void SetDragMessage(BMessage& message, ServerBitmap* bitmap, 92 const BPoint& offsetFromCursor); 93 // the message should be delivered on the next 94 // "mouse up". 95 // if the mouse is not pressed, it should 96 // be delivered to the "current" target right away. 97 98 void SetDesktop(Desktop* desktop); 99 100 private: 101 status_t _Run(); 102 void _Unset(); 103 104 bool _SendMessage(BMessenger& messenger, BMessage* message, float importance); 105 106 bool _AddTokens(BMessage* message, EventTarget* target, uint32 eventMask, 107 BMessage* nextMouseMoved = NULL, int32* _viewToken = NULL); 108 void _RemoveTokens(BMessage* message); 109 void _SetFeedFocus(BMessage* message); 110 void _UnsetFeedFocus(BMessage* message); 111 112 void _SetMouseTarget(const BMessenger* messenger); 113 void _UnsetLastMouseTarget(); 114 115 bool _AddListener(EventTarget& target, int32 token, 116 uint32 eventMask, uint32 options, bool temporary); 117 void _RemoveTemporaryListeners(); 118 119 void _DeliverDragMessage(); 120 121 void _EventLoop(); 122 void _CursorLoop(); 123 124 static status_t _event_looper(void* dispatcher); 125 static status_t _cursor_looper(void* dispatcher); 126 127 private: 128 EventStream* fStream; 129 thread_id fThread; 130 thread_id fCursorThread; 131 132 EventTarget* fPreviousMouseTarget; 133 EventTarget* fFocus; 134 bool fSuspendFocus; 135 136 EventFilter* fMouseFilter; 137 EventFilter* fKeyboardFilter; 138 139 BObjectList<EventTarget> fTargets; 140 141 BMessage* fNextLatestMouseMoved; 142 BPoint fLastCursorPosition; 143 int32 fLastButtons; 144 145 BMessage fDragMessage; 146 bool fDraggingMessage; 147 BPoint fDragOffset; 148 ServerBitmap* fDragBitmap; 149 // NOTE: unfortunately, the EventDispatcher 150 // has to know what a ServerBitmap is... 151 // otherwise, linking the libs in the 152 // testenvironment is problematic, because 153 // the alternative is that HWInterface knows 154 // about BitmapManager 155 156 BLocker fCursorLock; 157 HWInterface* fHWInterface; 158 Desktop* fDesktop; 159 }; 160 161 #endif /* EVENT_DISPATCHER_H */ 162