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序号：19439 发表者：atang 发表日期：2002-10-29 04:55:55
<br>主题：如何区分鼠标单击和双击??
<br>内容：我想让鼠标单击和双击时实现不同的功能,用到OnLButtonDown和OnLButtonDblClk,可是执行的时候从来没有运行OnLButtonDblClk.怎样才能让程序认为我给的是鼠标双击而不是两次单击呢?
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回复者：hxu 回复日期：2002-10-29 05:17:42
<br>内容：必须窗口的WNDCLASS包含了类样式： CS_DBLCLKS才可以，但MFC默认的有此样式。<BR>所以窗口应该可以接受双击消息。<BR>你的窗口必须注册了接受双击消息，才可以。<BR>如果不行，可能就是因为你没有注册，添加一下吧。<BR>另外在消息映射里要把他们关联起来。
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回复者：atang 回复日期：2002-10-29 19:35:04
<br>内容：不懂你在说什么啊,看看俺的程序先...:(<BR>//OnLButtonDown<BR>void CMainWnd::OnLButtonDown(UINT nFlags,CPoint point)<BR>{<BR> SetCapture();<BR> CString szAboutLeft = "This is a minimal Windows MFC program.\n"<BR> "You've pressed the Left mouse button!";<BR> ::MessageBeep(MB_ICONINFORMATION);<BR> ::MessageBox(GetSafeHwnd(),szAboutLeft,"About",MB_OK |MB_ICONINFORMATION);<BR> CFrameWnd::OnLButtonDown(nFlags,point);<BR>}<BR>//OnRButtonDown<BR>void CMainWnd::OnRButtonDown(UINT nFlags,CPoint point)<BR>{<BR> CString szAboutRight = "This is a minimal Windows MFC program.\n"<BR> "You've pressed the Right mouse button!";<BR> ::MessageBeep(MB_ICONINFORMATION);<BR> ::MessageBox(GetSafeHwnd(),szAboutRight,"About",MB_OK |MB_ICONINFORMATION);<BR> CFrameWnd::OnRButtonDown(nFlags,point);<BR>}<BR>//OnLButtonDblClk<BR>void CMainWnd::OnLButtonDblClk(UINT nFlags,CPoint point)<BR>{<BR> CString szAboutDblClk = "This is a minimal Windows MFC program.\n"<BR> "Hello,World";<BR> ::MessageBeep(MB_ICONINFORMATION);<BR> ::MessageBox(GetSafeHwnd(),szAboutDblClk,"About",MB_OK |MB_ICONINFORMATION);<BR> CFrameWnd::OnLButtonDblClk(nFlags,point);<BR>}<BR>//OnLButtonUp<BR>void CMainWnd::OnLButtonUp(UINT nFlags,CPoint Point)<BR>{<BR> <BR> ReleaseCapture();<BR> CFrameWnd::OnLButtonUp(nFlags,Point);<BR>}<BR>//<BR>BOOL CMinApp::InitInstance()<BR>{<BR> CMainWnd *pFrame = new CMainWnd;<BR> pFrame->Create(0,_T("Another Minimal MFC Program"));<BR> pFrame->ShowWindow(SW_SHOWMAXIMIZED);<BR> pFrame->UpdateWindow();<BR> this->m_pMainWnd = pFrame;<BR> return TRUE;<BR>}<BR>CMinApp MyApp;<BR>
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回复者：hxu 回复日期：2002-10-29 21:34:58
<br>内容：系统之所以认为你是双击而不是2次单击<BR>是因为程序窗口类中有CS_DBLCLKS样式。<BR>而CS_DBLCLKS样式是mfc中窗口中默认的。<BR>消息映射中可能也应该有双击消息和OnLButtonDblClk处理函数的关联。<BR>
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回复者：Waynew Hsu 回复日期：2002-10-29 22:24:41
<br>内容：是不是手工添加的函数，如果用class wizard应该自动定义了消息映射的啊。
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回复者：无非 回复日期：2002-10-29 22:32:32
<br>内容：你有了OnLButtonDown,你双击的时候，你的窗口会认为是两次LButtonDown和LButtonUp。<BR><BR>
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回复者：hxu 回复日期：2002-10-29 23:41:23
<br>内容：不一定吧？
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回复者：Waynew Hsu 回复日期：2002-10-30 04:53:45
<br>内容：If you want your window procedure to receive double-click mouse messages, you must include the identifier CS_DBLCLKS when initializing the style field in the window class structure before calling RegisterClass: <BR><BR><BR>wndclass.style = CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS ;<BR><BR>If you do not include CS_DBLCLKS in the window style and the user clicks the left mouse button twice in quick succession, your window procedure receives these messages: <BR><BR><BR>WM_LBUTTONDOWN<BR>WM_LBUTTONUP<BR>WM_LBUTTONDOWN<BR>WM_LBUTTONUP<BR><BR>The window procedure might also receive other messages between these button messages. If you want to implement your own double-click logic, you can use the Windows function GetMessageTime to obtain the relative times of the WM_LBUTTONDOWN messages. <BR><BR>If you include CS_DBLCLKS in your window class style, the window procedure receives these messages for a double-click: <BR><BR><BR>WM_LBUTTONDOWN<BR><BR>WM_LBUTTONUP<BR>WM_LBUTTONDBLCLK<BR>WM_LBUTTONUP<BR><BR>The WM_LBUTTONDBLCLK message simply replaces the second WM_LBUTTONDOWN message. <BR><BR>Double-click messages are much easier to process if the first click of a double-click performs the same action as a single click. The second click (the WM_LBUTTONDBLCLK message) then does something in addition to the first click. For example, look at how the mouse works with the file lists in Windows Explorer. A single click selects the file. Windows Explorer highlights the file with a reverse-video bar. A double-click performs two actions: the first click selects the file, just as a single click does; the second click directs Windows Explorer to open the file. That's fairly easy logic. Mouse-handling logic could get more complex if the first click of a double-click did not perform the same action as a single click. <BR>
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<font color=red>答案被接受</font><br>回复者：Waynew Hsu 回复日期：2002-10-30 05:05:23
<br>内容：如果希望窗口过程能够收到双击键的鼠标消息，那么在调用RegisterClass初始化窗口类结构中时，必须在窗口风格中包含CS_DBLCLKS标志符：<BR><BR>wndclass.style = CS_HREDRAW | ..| CS_DBLCLKS;<BR><BR>如果窗口风格没有包含CS_DBLCLKS，而用户在短时间内双击了鼠标，那么窗口过程接收到了下面这些消息：<BR><BR>WM_LBUTTONDOWN<BR>WM_LBUTTONUP<BR>WM_LBUTTONDOWN<BR>WM_LBUTTONUP<BR><BR>窗口过程可能在这些键消息之前还收到了其他消息。如果您想实现自己的双击逻辑，那么您可以使用GetMessageTime获取WM_LBUTTONDOWN消息之间的相对时间。<BR><BR>如果窗口类风格中包含了CS_DBLCLKS，那么双击鼠标键时窗口过程将接收到如下消息：<BR><BR>WM_LBUTTONDOWN<BR>WM_LBUTTONUP<BR>WM_LBUTTONDBLCLK<BR>WM_LBUTTONUP<BR><BR>WM_LBUTTONDBLCLK消息简单的替换了第二个WM_LBUTTONDOWN消息。。<BR><BR>参考Charles Petzold<<Programing Windows>>第7章鼠标。<BR>中文版《Windows程序设计》P260..
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回复者：Niphen 回复日期：2002-10-31 19:33:40
<br>内容：不用争了，他的程序肯定不会有双击出现。<BR><BR>在第一个LBUTTONDOWN的时候就弹出了一个messageBox，焦点都转移到另外一个窗口上去了，第二个单击根本就不会发生嘛。
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