前篇的框架中，有一个事件处理函数:
virtual bool HandleEvent( IEvent* pEvent );
这个回调函数用于在自己的应用程序中响应各种事件, IEvent的定义如下:
class IEvent
{
public:
virtual std::wstring GetEventName( ) = 0;
virtual eEVENT GetEventType( ) = 0;
};
主要用到GetEventType来获取事件类型,目前支持的有:
enum eEVENT
{
//GUI_CURSOR_OVER,
//GUI_CURSOR_ENTER,
//GUI_CURSOR_LEAVE,
//GUI_CURSOR_BUTTON_DOWN,
//GUI_CURSOR_BUTTON_PRESSED,
//GUI_CURSOR_BUTTON_UP,
//GUI_UI_BUTTON_PRESSED,
RENDER_FRAME_START,
SYSTEM_LBUTTON_DOWN,
SYSTEM_LBUTTON_UP,
SYSTEM_MBUTTON_DOWN,
SYSTEM_MBUTTON_UP,
SYSTEM_RBUTTON_DOWN,
SYSTEM_RBUTTON_UP,
SYSTEM_MOUSE_LEAVE,
SYSTEM_MOUSE_WHEEL,
SYSTEM_MOUSE_MOVE,
SYSTEM_KEYBOARD_KEYDOWN,
SYSTEM_KEYBOARD_KEYUP,
SYSTEM_KEYBOARD_CHAR,
WINDOW_RESIZE,
LOG_MESSAGE,
INFO_MESSAGE,
ERROR_MESSAGE,
//TEXT_CONTROLLER_STATE_REQUEST,
//ENTITY3D_CONTROLLER_STATE_REQUEST,
NUM_EVENTS
};
你可以根据需要自行添加.
让我们来看一个示例:
View Code
1 bool App::HandleEvent( IEvent* pEvent )
2 {
3 eEVENT e = pEvent->GetEventType();
4
5 if ( e == SYSTEM_KEYBOARD_KEYDOWN )
6 {
7 EvtKeyDown* pKeyDown = (EvtKeyDown*)pEvent;
8
9 unsigned int key = pKeyDown->GetCharacterCode();
10
11 return( true );
12 }
13 else if ( e == SYSTEM_KEYBOARD_KEYUP )
14 {
15 EvtKeyUp* pKeyUp = (EvtKeyUp*)pEvent;
16
17 unsigned int key = pKeyUp->GetCharacterCode();
18
19 if ( key == VK_ESCAPE ) // 'Esc' Key - Exit the application
20 {
21 this->RequestTermination();
22 return( true );
23 }
24 else if ( key == 0x53 ) // 'S' Key - Save a screen shot for the next frame
25 {
26 m_bSaveScreenshot = true;
27 return( true );
28 }
29 else
30 {
31 return( false );
32 }
33 }
34
35 // Call the parent class's event handler if we haven't handled the event.
36
37 return( Application::HandleEvent( pEvent ) );
38 }
那么这个回调何时被响应呢?答案是这个由你来控制,一般情况下,在update里调用这个方法就行了：
EventManager::Get()->ProcessEvent();