subject_23330.htm

一些关于vc的问答

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序号：23330 发表者：符号 发表日期：2002-12-03 11:48:19
<br>主题：客户区的拖动问题！！
<br>内容：客户区的拖动问题！！<BR>用下面三个函数实现客户区的拖动<BR>出现的问题是：只能动一下<BR><BR>不知问题出在哪里？（也试过OnNcHitTest，也不行）<BR>请各位指教<BR>void CHelpView::OnLButtonDown(UINT nFlags, CPoint point) <BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;SetCapture();<BR>&nbsp;&nbsp;&nbsp;&nbsp;m_bCaptured = TRUE;<BR>&nbsp;&nbsp;&nbsp;&nbsp;m_OldPosition = point;<BR>&nbsp;&nbsp;&nbsp;&nbsp;ClientToScreen(&amp;m_OldPosition);<BR>&nbsp;&nbsp;&nbsp;&nbsp;CView::OnLButtonDown(nFlags, point);<BR>}<BR><BR>void CHelpView::OnMouseMove(UINT nFlags, CPoint point) <BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;if( m_bCaptured )//&amp;&amp; (nFlags&amp;MK_LBUTTON) )<BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;GetWindowRect(&amp;m_rectWnd);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ClientToScreen(&amp;point);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_rectWnd.OffsetRect(point.x-m_OldPosition.x, point.y-m_OldPosition.y);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_OldPosition = point;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;MoveWindow(m_rectWnd.left,<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; m_rectWnd.top,<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; m_rectWnd.right-m_rectWnd.left,<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; m_rectWnd.bottom-m_rectWnd.top,TRUE);<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;CView::OnMouseMove(nFlags, point);<BR>}<BR><BR>void CHelpView::OnLButtonUp(UINT nFlags, CPoint point) <BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;if(m_bCaptured)<BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;GetWindowRect(&amp;m_rectWnd);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ClientToScreen(&amp;point);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_rectWnd.OffsetRect(-point.x+m_OldPosition.x, -point.y+m_OldPosition.y);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_OldPosition = point;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;MoveWindow(m_rectWnd.left,<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; m_rectWnd.top,<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; m_rectWnd.right-m_rectWnd.left,<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; m_rectWnd.bottom-m_rectWnd.top,TRUE);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ReleaseCapture();<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;m_bCaptured = FALSE;<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;CView::OnLButtonUp(nFlags, point);<BR>}<BR>
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回复者：树爱兵 回复日期：2002-12-03 13:44:51
<br>内容：参考：<BR>
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回复者：符号 回复日期：2002-12-03 14:33:55
<br>内容：我没说清楚<BR>我的目的是<BR>在客户区按住鼠标左键拖动整个窗口，而不是拖动客户区的某一个对象
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回复者：树爱兵 回复日期：2002-12-03 15:20:35
<br>内容：用鼠标单击窗口标题条以外区域移动窗口 <BR><BR>移动标准窗口是通过用鼠标单击窗口标题条来实现的，但对于没有标题条的 <BR>窗口，就需要用鼠标单击窗口标题条以外区域来移动窗口。有两种方法可以 <BR>达到这一目标。 <BR><BR>方法一： <BR>当窗口确定鼠标位置时，Windows向窗口发送WM_NCHITTEST消息，可以处理该 <BR>消息，使得只要鼠标在窗口内，Windows便认为鼠标在标题条上。这需要重载 <BR>CWnd类处理WM_NCHITTEST消息的OnNcHitTest函数，在函数中调用父类的该函数， <BR>如果返回HTCLIENT，说明鼠标在窗口客户区内，使重载函数返回HTCAPTION， <BR>使Windows误认为鼠标处于标题条上。 <BR><BR>下例是使用该方法的实际代码： <BR><BR>UINT CEllipseWndDlg::OnNcHitTest(CPoint point) <BR>{ <BR>// 取得鼠标所在的窗口区域 <BR>UINT nHitTest = CDialog::OnNcHitTest(point); <BR><BR>// 如果鼠标在窗口客户区，则返回标题条代号给Windows <BR>// 使Windows按鼠标在标题条上类进行处理，即可单击移动 <BR>//窗口 <BR>return (nHitTest==HTCLIENT) ? HTCAPTION : nHitTest; <BR>} <BR><BR>方法二：当用户在窗口客户区按下鼠标左键时，使Windows认为鼠标是在标题条 <BR>上，即在处理WM_LBUTTONDOWN消息的处理函数OnLButtonDown中发送一个wParam <BR>参数为HTCAPTION，lParam为当前坐标的WM_NCLBUTTONDOWN消息。 <BR>下面是使用该方法的实际代码： <BR><BR>void CEllipseWndDlg::OnLButtonDown(UINT nFlags, CPoint point) <BR>{ <BR>// 调用父类处理函数完成基本操作 <BR>CDialog::OnLButtonDown(nFlags, point); <BR><BR>// 发送WM_NCLBUTTONDOWN消息 <BR>// 使Windows认为鼠标在标题条上 <BR>PostMessage(WM_NCLBUTTONDOWN, <BR>HTCAPTION, <BR>MAKELPARAM(point.x, point.y)); <BR>} <BR>
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回复者：符号 回复日期：2002-12-03 15:29:29
<br>内容：但以上两种方法用在CView的派生类中好像不行，我试过了void CStudyHelpView::OnLButtonDown(UINT nFlags, CPoint point) <BR>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;CView::OnLButtonDown(nFlags, point);<BR>&nbsp;&nbsp;&nbsp;&nbsp;PostMessage( WM_NCLBUTTONDOWN, HTCAPTION, <BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; MAKELPARAM( point.x, point.y)); <BR>}<BR><BR>UINT CStudyHelpView::OnNcHitTest(CPoint point) <BR>{ <BR>&nbsp;&nbsp;&nbsp;&nbsp;UINT nHitTest = CView::OnNcHitTest( point ); <BR>&nbsp;&nbsp;&nbsp;&nbsp;return (nHitTest == HTCLIENT) ? HTCAPTION : nHitTest; <BR>}<BR>出来的效果如下图所示：<BR><BR>
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<font color=red>答案被接受</font><br>回复者：树爱兵 回复日期：2002-12-03 16:10:07
<br>内容：上面这个可以拖到对话框，对于视图结构好像不行！
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回复者：符号 回复日期：2002-12-03 16:18:35
<br>内容：感谢sabren<BR>视图结构拖动怎么办？<BR>
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