如何有效地使用对话框

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如何有效地使用对话框
译者：徐景周(原作：VGirish)

Q:如何在对话框中加入工具条

在 OnInitDialog 中加入下面代码：

BOOL CYourDlg::OnInitDialog()

{

       CDialog::OnInitDialog();	



       // Create the toolbar. To understand the meaning of the styles used, you 

       // can take a look at the MSDN for the Create function of the CToolBar class.

	   

       ToolBar.Create(this, WS_CHILD | WS_VISIBLE | CBRS_TOP | CBRS_TOOLTIPS |CBRS_FLYBY | CBRS_BORDER_BOTTOM);



      // I have assumed that you have named your toolbar''s resource as IDR_TOOLBAR1.

      // If you have given it a different name, change the line below to accomodate 

      // that by changing the parameter for the LoadToolBar function.

	  

      ToolBar.LoadToolBar(IDR_TOOLBAR1);

  

      CRect rcClientStart;

      CRect rcClientNow;

      GetClientRect(rcClientStart);





      // To reposition and resize the control bar



     RepositionBars(AFX_IDW_CONTROLBAR_FIRST, AFX_IDW_CONTROLBAR_LAST,0, reposQuery, rcClientNow);

     CPoint ptOffset(rcClientNow.left - rcClientStart.left,rcClientNow.top-rcClientStart.top);



     CRect rcChild;

     CWnd* pwndChild = GetWindow(GW_CHILD);



     while (pwndChild)

     {

       pwndChild->GetWindowRect(rcChild);

       ScreenToClient(rcChild);

       rcChild.OffsetRect(ptOffset);

       pwndChild->MoveWindow(rcChild, FALSE);

       pwndChild = pwndChild->GetNextWindow();

     } 

	  CRect rcWindow;

     GetWindowRect(rcWindow);

     rcWindow.right  = rcClientStart.Width() - rcClientNow.Width();

     rcWindow.bottom  = rcClientStart.Height() - rcClientNow.Height();

     MoveWindow(rcWindow, FALSE);	



     // And position the control bars

     RepositionBars(AFX_IDW_CONTROLBAR_FIRST, AFX_IDW_CONTROLBAR_LAST, 0);

  

     return TRUE;  // return TRUE  unless you set the focus to a control

  }

Q:如何改变对话框的形状？

可用下面一些函数：
CreatePolygonRgn
CreateRectRgn
CreateRoundRectRgn 等.

  CRgn m_rgn;  // Put this in your dialog''s header file. i.e. a member variable



  // This Gets the size of the Dialog: This piece of code is to be placed in the

  // OnInitDialog Function of your dialog.



  CRect rcDialog

  GetClientRect(rcDialog);



  // The following code Creates the area and assigns it to your Dialog

  m_rgn.CreateEllipticRgn(0, 0, rcDialog.Width(), rcDialogHeight());

  SetWindowRgn(GetSafeHwnd(), (HRGN) m_rgn, TRUE);

Q：如何实现非客户区移动？

可用下面二种方法

// Handler for WM_LBUTTONDOWN message



  void CYourDialog::OnLButtonDown(UINT nFlags, CPoint point)

  {

     CDialog::OnLButtonDown(nFlags, point);

     PostMessage( WM_NCLBUTTONDOWN, HTCAPTION, MAKELPARAM( point.x, point.y));

  }



  // Handler for WM_NCHITTEST message



  LONG CYourDialog::OnNcHitTest( UINT uParam, LONG lParam )

  {  

     int xPos = LOWORD(lParam);

     int yPos = HIWORD(lParam);

     UINT nHitTest = CDialog::OnNcHitTest(CSize(xPos, yPos));

     return (nHitTest == HTCLIENT) ? HTCAPTION : nHitTest;

  }

Q:如何使对话框初始为最小化状态？

在 OnInitDialog 中加入下面代码：

SendMessage(WM_SYSCOMMAND, SC_MAXIMIZE, NULL);

Q:如何限定对话框大小范围？

在 WM_SIZING中加入下面代码：

void CYourDialog::OnSizing(UINT fwSide, LPRECT pRect) 

  {

     if(pRect->right - pRect->left <=200)

     	pRect->right = pRect->left   200;

	

     if(pRect->bottom - pRect->top <=200)

     	pRect->bottom = pRect->top   200;



     CDialog::OnSizing(fwSide, pRect);

  }

Q:如何在对话框中加入状态条？

定义 CStatusBar 变量：

CStatusBar m_StatusBar;

定义状态条指定状态：

static UINT BASED_CODE indicators[] =

  {

     ID_INDICATOR_CAPS,

     ID_INDICATOR_NUM

  };

在 OnInitDialog 中加入下面代码：

  m_StatusBar.CreateEx(this,SBT_TOOLTIPS,WS_CHILD|WS_VISIBLE|CBRS_BOTTOM,AFX_IDW_STATUS_BAR);

 

  // Set the indicators namely caps and nums lock status

  m_StatusBar.SetIndicators(indicators,sizeof(indicators)/sizeof(UINT));



  CRect rect;

  GetClientRect(&rect);

		

  m_StatusBar.SetPaneInfo(0,ID_INDICATOR_CAPS,SBPS_NORMAL,rect.Width()/2);

  m_StatusBar.SetPaneInfo(1,ID_INDICATOR_NUM,SBPS_STRETCH ,rect.Width()/2);



  RepositionBars(AFX_IDW_CONTROLBAR_FIRST,AFX_IDW_CONTROLBAR_LAST,ID_INDICATOR_NUM);



  m_StatusBar.GetStatusBarCtrl().SetBkColor(RGB(180,180,180));

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