使用对话框几个技巧

最新推荐文章于 2017-07-15 14:05:19 发布

原创最新推荐文章于 2017-07-15 14:05:19 发布 · 563 阅读

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#dialog #header #function #null

2、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);
3、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;
  }
4、如何使对话框初始为最大化状态？
SendMessage(WM_SYSCOMMAND, SC_MAXIMIZE, NULL);
5、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);
  }