vc中对话框使用技巧集合(上)

注:以下代码以一个名为CTest6Dlg的对话框类为例

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1. 在任务栏隐藏对话框
       ModifyStyleEx(WS_EX_APPWINDOW, WS_EX_TOOLWINDOW);


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2. 使对话框为顶层窗口
         SetWindowPos(&this->wndTopMost, 0, 0, 0, 0, SWP_NOMOVE|SWP_NOSIZE);


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3. 在运行时添加最大化,最小化按钮
     SetWindowLong(this->m_hWnd, GWL_STYLE,
                   GetWindowLong(this->m_hWnd, GWL_STYLE) |
                   WS_MINIMIZEBOX | WS_MAXIMIZEBOX);
      UpdateWindow();

 

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4. 使能对话框右上角关闭按钮

     在OnInitDialog中

     方法一:
        CMenu* menu = GetSystemMenu(FALSE);
        menu->ModifyMenu(SC_CLOSE, MF_BYCOMMAND | MF_GRAYED );

     方法二:
        CMenu* menu = GetSystemMenu(FALSE);
        menu->EnableMenuItem(SC_CLOSE, MF_BYCOMMAND | MF_GRAYED);


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5. 当对话框一部分在屏幕外时,显示全部对话框
     SendMessage(DM_REPOSITION);


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6. 改变鼠标外形

     添加 WM_SETCURSOR 消息映射函数

     BOOL CTest6Dlg::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message)
     {
          SetCursor(AfxGetApp()->LoadStandardCursor(IDC_HELP));

          return 0;  
     }


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7. 改变对话框背景色和文本颜色

     在CTest6App的InitInstance中添加

     SetDialogBkColor(RGB(255,0,0), RGB(0,255,0));


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8. 改变对话框caption上的图标

     导入自己的图标资源到工程中,把原来ID为 IDR_MAINFRAME 的资源删除,把新的图标的ID命名为IDR_MAINFRAME


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9. 在主对话框显示前,显示一个login对话框

      BOOL CTest6App::InitInstance()
      {
           //...
           int nResponse;
           CLoginDlg loginDlg;

           nResponse = loginDlg.DoModal();
           if (nResponse == IDOK)
           {
           }
           if (nResponse == IDCANCEL)
           {
                return FALSE;
           }
  
           CTest6Dlg dlg;
           m_pMainWnd = &dlg;
           int nResponse = dlg.DoModal();
           if (nResponse == IDOK )
           {
           }
           else if (nResponse == IDCANCEL)
           {
           }
           return FALSE;
      }

然后重载CLoginDlg对话框的哦OnOK(),在其中判断条件
void CLoginDlg::OnOK()
{
      if (条件满足)
         CDialog::OnOK();
      else
         AfxMessageBox(_T("invalid password!"));
}

 

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10. 在对话框中添加工具栏

     方法一:添加以下代码到 OnInitDialog 中

      if ( !m_wndToolBar.Create(this) || !m_wndToolBar.LoadToolBar(IDR_TOOLBAR1) )
      {
           TRACE0("Failed to Create Dialog Toolbar\n");
           EndDialog(IDCANCEL);
      }

      CRect rcClientOld; // 久客户区RECT
      CRect rcClientNew; // 加入TOOLBAR后的CLIENT RECT
      GetClientRect(rcClientOld); //
      // Called to reposition and resize control bars in the client area of a window
      // The reposQuery FLAG does not really traw the Toolbar.   It only does the calculations.
      // And puts the new ClientRect values in rcClientNew so we can do the rest of the Math.
      //重新计算RECT大小
      RepositionBars(AFX_IDW_CONTROLBAR_FIRST,
                        AFX_IDW_CONTROLBAR_LAST,
                        0,
                        reposQuery,
                        rcClientNew);

     // All of the Child Windows (Controls) now need to be moved so the Tollbar does not cover them up.
      //所有的子窗口将被移动,以免被TOOLBAR覆盖
      // Offest to move all child controls after adding Tollbar
      //计算移动的距离
      CPoint ptOffset(rcClientNew.left-rcClientOld.left,
        rcClientNew.top-rcClientOld.top);

      CRect rcChild;
      CWnd* pwndChild = GetWindow(GW_CHILD);   //得到子窗口
      while(pwndChild) // 处理所有子窗口
      {
           //移动所有子窗口
          pwndChild->GetWindowRect(rcChild);
           ScreenToClient(rcChild);
           rcChild.OffsetRect(ptOffset);
           pwndChild->MoveWindow(rcChild,FALSE);
           pwndChild = pwndChild->GetNextWindow();
      }

      CRect rcWindow;
      GetWindowRect(rcWindow); // 得到对话框RECT
      rcWindow.right += rcClientOld.Width() - rcClientNew.Width(); // 修改对话框尺寸
      rcWindow.bottom += rcClientOld.Height() - rcClientNew.Height();
      MoveWindow(rcWindow,FALSE); // Redraw Window

      RepositionBars(AFX_IDW_CONTROLBAR_FIRST,AFX_IDW_CONTROLBAR_LAST,0);

     方法二:

         http://www.codeproject.com/dialog/dlgtoolstatusbar.asp


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11.响应对话框的最大化、最小化、关闭、恢复事件

      方法一:添加 WM_SYSCOMMAND 消息映射函数

      void CTest6Dlg::OnSysCommand(UINT nID, LPARAM lParam)
      {
           if ( (nID & 0xFFF0) == IDM_ABOUTBOX )
           {
                CAboutDlg dlgAbout;
                dlgAbout.DoModal();
       }
      else
      {
           if ( nID == SC_MAXIMIZE )
           {
                AfxMessageBox(_T("最大化"));
           }
           else if ( nID == SC_MINIMIZE )  
           {
                AfxMessageBox(_T("最小化"));
           }
           else if ( nID == SC_CLOSE )
           {
                AfxMessageBox(_T("关闭"));
           }

           CDialog::OnSysCommand(nID, lParam);
     }

      方法二:添加 WM_SIZE 消息映射函数

      void CTest6Dlg::OnSize(UINT nType, int cx, int cy)
      {
           CDialog::OnSize(nType, cx, cy);

           if ( nType == SIZE_MAXIMIZED )
           {
                AfxMessageBox(_T("最大化"));
           }
           else if ( nType == SIZE_MINIMIZED )
           {
                AfxMessageBox(_T("最小化"));
           }  
           else if ( nType == SIZE_RESTORED )
           {
                AfxMessageBox(_T("恢复"));
           }
      }


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12.代码实现窗口最小化,最大化,关闭

PostMessage(WM_SYSCOMMAND,   SC_MINIMIZE);
PostMessage(WM_SYSCOMMAND,   SC_MAXIMIZE);
PostMessage(WM_SYSCOMMAND,   SC_CLOSE);


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13.按下ESC和ENTER键时禁止关闭对话框
   
     方法一:

      (1) 重载OnCancel和OnOk,屏蔽其中的CDialog::OnCancel()和CDialog::OnOk();
      (2) 添加以下代码
      void CTest6Dlg::OnSysCommand(UINT nID, LPARAM lParam)
      {
          if ((nID & 0xFFF0) == IDM_ABOUTBOX)
           {
              CAboutDlg dlgAbout;    //if you have an about dialog
               dlgAbout.DoModal();
           }
           else if ((nID & 0xFFF0) == SC_CLOSE)
           {
               //用户点击右上角"X"
               EndDialog(IDOK);  
       
           }
           else
           {
               CDialog::OnSysCommand(nID, lParam);
           }
      }

     方法二:

      BOOL CTest6Dlg::PreTranslateMessage(MSG* pMsg)
      {
           if ( pMsg->message == WM_KEYDOWN )
           {
                switch(pMsg->wParam)
                {
                case VK_ESCAPE:
                 return TRUE; //直接返回TRUE
                 break;
                case VK_RETURN:
                 return TRUE;
                 break;
                }
           }
           return CDialog::PreTranslateMessage(pMsg);
      }

      方法三:
          Q122489:
          How to Disable Default Pushbutton Handling for MFC Dialog
         http://support.microsoft.com/kb/122489/en-us


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14.在对话框中处理键盘鼠标消息

处理PreTranslateMessage消息

以下代码示例只演示了键盘WM_KEYDOWN消息,你也可以处理鼠标消息,比如WM_LBUTTONDOWN,WM_LBUTTONUP,WM_RBUTTONDOWN等。

BOOL CTest6Dlg::PreTranslateMessage(MSG* pMsg)  
{
     /**********************************************************/
     /*     当焦点在combobox(drop down风格)的edit上,响应回车             */
     /***********************************************************/
     if ( pMsg->message == WM_KEYDOWN )
     {         
         switch( pMsg->wParam )
         {
         case VK_RETURN:
             CEdit *pEdit = (CEdit*)m_combo1.GetWindow(GW_CHILD);
             if(pMsg->hwnd == pEdit->m_hWnd )
             {  
                  AfxMessageBox("在combobox的edit中按下了Enter!");
             }             
             return TRUE;
         }
     }

     /****************************************/
     /*    ALT为WM_SYSKEYDOWN                   */
     /****************************************/
     if( pMsg->message == WM_SYSKEYDOWN )
     {    
         switch( pMsg->wParam )
         {
         case VK_F1:     
             if(::GetKeyState(VK_MENU) < 0)//ALT+F1
             {
                 AfxMessageBox("按下了ALT+F1");
                 return TRUE;
             }             
         }         
     }
    
     /****************************************/
     /*      在clistctrl中按ctrl+A选中所有项   */
     /****************************************/
     if( pMsg->message == WM_KEYDOWN )
     {    
         if(pMsg->hwnd == GetDlgItem(IDC_LIST1)->m_hWnd)
         {
             switch( pMsg->wParam )
             {
             case 65://A     
               if(::GetKeyState(VK_CONTROL) < 0)//Shift+enter
               {
                     for(int i=0; i<m_list.GetItemCount(); i++)
                     {
                         m_list.SetItemState(i, LVIS_SELECTED|LVIS_FOCUSED,
                                             LVIS_SELECTED|LVIS_FOCUSED);
                     }
               }
               return TRUE;
             }
         }
     }  

     /****************************************/
     /*     当焦点在combobox,弹出自定义菜单    */
     /****************************************/      
     if(pMsg->message == WM_RBUTTONDOWN)
     {
         CEdit *pEdit = (CEdit*)m_combo1.GetWindow(GW_CHILD);
         if(pMsg->hwnd == pEdit->m_hWnd)
         {
             DWORD dwPos = GetMessagePos();
             CPoint point( LOWORD(dwPos), HIWORD(dwPos) );
             ScreenToClient(&point);
             ClientToScreen(&point);
             
             CMenu menu;
             VERIFY( menu.LoadMenu( IDR_MENU1 ) );
             CMenu* popup = menu.GetSubMenu(0);
             ASSERT( popup != NULL );
             popup->TrackPopupMenu(TPM_LEFTALIGN | TPM_RIGHTBUTTON, point.x, point.y, this );
         }         
     }

     return CDialog::PreTranslateMessage(pMsg);
}


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15.对话框启动即隐藏

     添加 WM_SHOWWINDOW 的消息映射

      void CTest6Dlg::OnShowWindow(BOOL bShow, UINT nStatus)
      {
           if ( GetStyle() & WS_VISIBLE )
           {
                CDialog::OnShowWindow(bShow, nStatus);
           }
           else
           {
                long Style = ::GetWindowLong(*this, GWL_STYLE);
                ::SetWindowLong(*this, GWL_STYLE, Style | WS_VISIBLE);
                CDialog::OnShowWindow(SW_HIDE, nStatus);
           }
      }

posted on 2008-04-02 15:54 wrh 阅读(1074) 评论(0)  编辑 收藏 引用


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