Hieroglyph3 框架分析2

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 }