MFC dialog 窗口的 拖放和伸縮

做項目的時候，遇到這樣一個問題：

窗口要進行可以拖放和伸縮的功能，但是因爲是以一張圖片爲背景的，

當設置 border 爲resizing 的時候，雖然可以伸縮，但是在窗口的左邊和上邊都有一些框， 而這些框都是呈現出白色。

 

在網上所找的資料終於實現這一功能：

 

 

 

////添加如下3個消息 實現伸縮功能： void CAboutDlg::OnNcLButtonDown(UINT nHitTest, CPoint point) { // TODO: 在此添加消息處理程序代碼和/或調用默認值 if(nHitTest == HTTOP) SendMessage( WM_SYSCOMMAND, SC_SIZE | WMSZ_TOP, MAKELPARAM(point.x, point.y)); else if(nHitTest == HTBOTTOM) SendMessage( WM_SYSCOMMAND, SC_SIZE | WMSZ_BOTTOM, MAKELPARAM(point.x, point.y)); else if(nHitTest == HTLEFT) SendMessage( WM_SYSCOMMAND, SC_SIZE | WMSZ_LEFT, MAKELPARAM(point.x, point.y)); else if(nHitTest == HTRIGHT) SendMessage( WM_SYSCOMMAND, SC_SIZE | WMSZ_RIGHT, MAKELPARAM(point.x, point.y)); else if(nHitTest == HTTOPLEFT) SendMessage( WM_SYSCOMMAND, SC_SIZE | WMSZ_TOPLEFT, MAKELPARAM(point.x, point.y)); else if(nHitTest == HTTOPRIGHT) SendMessage( WM_SYSCOMMAND, SC_SIZE | WMSZ_TOPRIGHT, MAKELPARAM(point.x, point.y)); else if(nHitTest == HTBOTTOMLEFT) SendMessage( WM_SYSCOMMAND, SC_SIZE | WMSZ_BOTTOMLEFT, MAKELPARAM(point.x, point.y)); else if(nHitTest == HTBOTTOMRIGHT) SendMessage(WM_SYSCOMMAND, SC_SIZE | WMSZ_BOTTOMRIGHT, MAKELPARAM(point.x, point.y)); CDialog::OnNcLButtonDown(nHitTest, point); } LRESULT CAboutDlg::OnNcHitTest(CPoint point) { CRect rect; GetWindowRect(&rect); if(point.x <= rect.left+3) return HTLEFT; else if(point.x >= rect.right-3) return HTRIGHT; else if(point.y <= rect.top+3) return HTTOP; else if(point.y >= rect.bottom-3) return HTBOTTOM; else if(point.x <= rect.left+10 && point.y <= rect.top+10) return HTTOPLEFT; else if(point.x >= rect.right-10 && point.y <= rect.top+10) return HTTOPRIGHT; else if(point.x <= rect.left+10 && point.y >= rect.bottom-10) return HTBOTTOMLEFT; else if(point.x >= rect.right-10 && point.y >= rect.bottom-10) return HTBOTTOMRIGHT; ///下面的這一行必須得添加 要不然拖放功能無法實現 return HTCAPTION; } BOOL CAboutDlg::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message) { // TODO: 在此添加消息處理程序代碼和/或調用默認值 if(nHitTest == HTCAPTION || nHitTest == HTSYSMENU || nHitTest == HTMENU || nHitTest == HTCLIENT) { SetCursor(LoadCursor(NULL, MAKEINTRESOURCE(IDC_ARROW))); } else if(nHitTest == HTTOP || nHitTest == HTBOTTOM) { SetCursor(LoadCursor(NULL, MAKEINTRESOURCE(IDC_SIZENS))); } else if(nHitTest == HTLEFT || nHitTest == HTRIGHT) { SetCursor(LoadCursor(NULL, MAKEINTRESOURCE(IDC_SIZEWE))); } else if(nHitTest == HTTOPLEFT || nHitTest == HTBOTTOMRIGHT) { SetCursor(LoadCursor(NULL, MAKEINTRESOURCE(IDC_SIZENWSE))); } else if(nHitTest == HTTOPRIGHT || nHitTest == HTBOTTOMLEFT) { SetCursor(LoadCursor(NULL, MAKEINTRESOURCE(IDC_SIZENESW))); } else { SetCursor(LoadCursor(NULL, MAKEINTRESOURCE(IDC_ARROW))); } return 0; }

 

 

 

 

參考地址：

伸縮：

http://blog.csdn.net/mynamelj/archive/2006/12/16/1445567.aspx

拖放：

http://topic.csdn.net/t/20010806/11/225414.html