一.真窗体和假窗体
首先在DirectWindow内部创建一个真窗体(基于WTL),可以接收消息
class CMessageWindow : public CWindowImpl< CMessageWindow >
{
public:
CMessageWindow();
~CMessageWindow();
BEGIN_MSG_MAP( CMessageWindow )
MESSAGE_RANGE_HANDLER( 0, 0xFFFF, HandleMessage )
END_MSG_MAP()
}
然后在在HandleMessage 处理消息
二.通过MessageDispatcher转发消息
三.组装给上层比较容易理解的数据结构
这样上层就捕捉不到WM_LBUTTONUP消息,而变成自己封装的DirectUI_LButtonUp消息了
全部伪代码
class EventArg
{
public:
int nId;
};
class MouseEventArg:public EventArg
{
public:
int nX;
int nY;
int uKeyFlags;
};
class MessageDispatcher
{
MessageDispatcher(DirectWindow *pWindow)
{
m_pWindow=pWindow;
}
void DispatcherLButtonUp(POINT pt,UINT uKeyFlags,BOOL *pbHandled)
{
MouseEventArg arg;
arg.nId=DirectUI_LButtonUp;
arg.nX=pt.x;
arg.nY=pt.y;
m_pWindow->OnMessage(&arg);
}
private:
DirectWindow *m_pWindow;
};
class CMessageWindow : public CWindowImpl< CMessageWindow >
{
public:
CMessageWindow();
~CMessageWindow();
BEGIN_MSG_MAP( CMessageWindow )
MESSAGE_RANGE_HANDLER( 0, 0xFFFF, HandleMessage )
END_MSG_MAP()
virtual LRESULT HandleMessage( UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled );
private:
MessageDispatcher *m_pMessageDispatcher;
}
void CMessageWindow::OnLButtonUp( HWND hWnd, int nX, int nY, UINT uKeyFlags, BOOL& bHandled )
{
POINT pt = {nX, nY};
::ClientToScreen(hWnd, &pt);
m_pMessageDispatcher->DispatcherLButtonUp(pt, uKeyFlags, &bHandled)
}
class IElement;
class DirectWindow
{
HRESULT OnMessage( IElement *pElement, EventArg *pArg, BOOL* pbHandled);
private:
CMessageWindow *m_pMessageWindow;
};
Original: https://www.cnblogs.com/Clingingboy/p/3415581.html
Author: Clingingboy
Title: DirectUI消息循环的简单封装
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