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    实现效果需要处理以下这三个消息:

    WM_NCHITTEST WM_SETCURSOR WM_NCLBUTTONDOWN

    很多人在问三个函数是做什么用的,下面我大概介绍一下:

    OnNcHitTest(UINT nHitTest, CPoint point)是用来测试鼠标的位置,Nc表示非客户区

    OnSetCursor(HWND hWnd, UINT nHitTest, UINT message) 是用来设置鼠标状态

    OnNcLButtonDown(UINT nHitTest, CPoint point)是用来处理非客户区的鼠标左键点击

    有不懂的可以留言交流一下,希望本文章对大家有所帮助

    消息处理函数:

    UINT CXXXDlg::OnNcHitTest(UINT nHitTest, CPoint point)
    ...{
     CRect rect;
     GetWindowRect(&rect);
    if(point.x<=rect.left+3)
        returnHTLEFT;
    elseif(point.x>=rect.right-3)
        returnHTRIGHT;
    elseif(point.y<=rect.top+3)
        returnHTTOP;
    elseif(point.y>=rect.bottom-3)
        returnHTBOTTOM;
    elseif(point.x<=rect.left+10&&point.y<=rect.top+10)
        returnHTTOPLEFT;
    elseif(point.x>=rect.right-10&&point.y<=rect.top+10)
        returnHTTOPRIGHT;
    elseif(point.x<=rect.left+10&&point.y>=rect.bottom-10)
        returnHTBOTTOMLEFT;
    elseif(point.x>=rect.right-10&&point.y>=rect.bottom-10)
        returnHTBOTTOMRIGHT;

     else

        return CDialog::OnNcHitTest(point);
    }


    BOOL CXXXDlg::OnSetCursor(HWND hWnd, UINT nHitTest, UINT message)
    ...{
        if(nHitTest==HTCAPTION||nHitTest==HTSYSMENU||
            nHitTest==HTMENU||nHitTest==HTCLIENT)
       ...{
            SetCursor(LoadCursor(NULL, MAKEINTRESOURCE(IDC_ARROW)));
        }
       elseif(nHitTest==HTTOP||nHitTest==HTBOTTOM)
       ...{
            SetCursor(LoadCursor(NULL, MAKEINTRESOURCE(IDC_SIZENS)));
        }
       elseif(nHitTest==HTLEFT||nHitTest==HTRIGHT)
       ...{
            SetCursor(LoadCursor(NULL, MAKEINTRESOURCE(IDC_SIZEWE)));
        }
       elseif(nHitTest==HTTOPLEFT||nHitTest==HTBOTTOMRIGHT)
       ...{
            SetCursor(LoadCursor(NULL, MAKEINTRESOURCE(IDC_SIZENWSE)));
        }
       elseif(nHitTest==HTTOPRIGHT||nHitTest==HTBOTTOMLEFT)
       ...{
            SetCursor(LoadCursor(NULL, MAKEINTRESOURCE(IDC_SIZENESW)));
        }
       else
       ...{
            SetCursor(LoadCursor(NULL, MAKEINTRESOURCE(IDC_ARROW)));
         }
    }


    voidCXXXDlg::OnNcLButtonDown(UINT nHitTest, CPoint point)
    ...{
       if(nHitTest==HTTOP)
            SendMessage( WM_SYSCOMMAND, SC_SIZE|WMSZ_TOP, MAKELPARAM(point.x, point.y));
       elseif(nHitTest==HTBOTTOM)
            SendMessage( WM_SYSCOMMAND, SC_SIZE|WMSZ_BOTTOM, MAKELPARAM(point.x, point.y));
       elseif(nHitTest==HTLEFT)
            SendMessage( WM_SYSCOMMAND, SC_SIZE|WMSZ_LEFT, MAKELPARAM(point.x, point.y));
       elseif(nHitTest==HTRIGHT)
            SendMessage( WM_SYSCOMMAND, SC_SIZE|WMSZ_RIGHT, MAKELPARAM(point.x, point.y));
       elseif(nHitTest==HTTOPLEFT)
            SendMessage( WM_SYSCOMMAND, SC_SIZE|WMSZ_TOPLEFT, MAKELPARAM(point.x, point.y));
       elseif(nHitTest==HTTOPRIGHT)
            SendMessage( WM_SYSCOMMAND, SC_SIZE|WMSZ_TOPRIGHT, MAKELPARAM(point.x, point.y));
       elseif(nHitTest==HTBOTTOMLEFT)
            SendMessage( WM_SYSCOMMAND, SC_SIZE|WMSZ_BOTTOMLEFT, MAKELPARAM(point.x, point.y));
       elseif(nHitTest==HTBOTTOMRIGHT)
            SendMessage(WM_SYSCOMMAND, SC_SIZE|WMSZ_BOTTOMRIGHT, MAKELPARAM(point.x, point.y));
    }
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  • 原文地址:https://www.cnblogs.com/cavehubiao/p/3752916.html
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