深入浅出 CPropertySheet

深入浅出 CPropertySheet
译者：徐景周(原作:Mustafa Demirhan)

为了最大限度的发挥属性页的效用，首先让我们先从 CPropertySheet 继承一个新类，取名为 CMyPropSheet.
接着便可以进行下面的各种操作:

一、隐藏属性页默认按钮

隐藏掉Apply应用按钮:

CWnd *pWnd = GetDlgItem( IDCANCEL );<span style="font-family: Helvetica, Tahoma, Arial, sans-serif;">//隐藏掉Cancel取消按钮:</span>
pWnd->ShowWindow( FALSE );

//--隐藏应用、帮助、确定、取消按钮

CWnd *pWnd = GetDlgItem (ID_APPLY_NOW);
	if(pWnd && pWnd->GetSafeHwnd())
    pWnd->ShowWindow (FALSE);
	
    pWnd = GetDlgItem (IDHELP);
	if(pWnd && pWnd->GetSafeHwnd())
    pWnd->ShowWindow (FALSE);

	 pWnd = GetDlgItem (IDOK);
	if(pWnd && pWnd->GetSafeHwnd())
    pWnd->ShowWindow (FALSE);

	 pWnd = GetDlgItem (IDCANCEL);
	if(pWnd && pWnd->GetSafeHwnd())
    pWnd->ShowWindow (FALSE);

二、移动属性页按钮

首先，要获取按钮的句柄，然后就可以象对待窗体一样处理它们了. 下面代码先隐藏掉Apply和Help铵钮，再把OK和Cancel按移动到右侧

BOOL CMyPropSheet::OnInitDialog () 
{
    BOOL bResult = CPropertySheet::OnInitDialog();

    int ids [] = {IDOK, IDCANCEL};//, ID_APPLY_NOW, IDHELP };
    
    // Hide Apply and Help buttons
    CWnd *pWnd = GetDlgItem (ID_APPLY_NOW);
    pWnd->ShowWindow (FALSE);
    pWnd = GetDlgItem (IDHELP);
    pWnd->ShowWindow (FALSE);
    
    CRect rectBtn;
    int nSpacing = 6;        // space between two buttons...

    for( int i =0; i < sizeof(ids)/sizeof(int); i++)
    {
        GetDlgItem (ids [i])->GetWindowRect (rectBtn);
        
        ScreenToClient (&rectBtn);
        int btnWidth = rectBtn.Width();
        rectBtn.left = rectBtn.left + (btnWidth + nSpacing)* 2;
        rectBtn.right = rectBtn.right + (btnWidth + nSpacing)* 2;

        GetDlgItem (ids [i])->MoveWindow(rectBtn);
    }

    
    return bResult;
}

下面代码:

移动所有按钮到右侧，并且重新置属性页为合适的大小:

BOOL CMyPropSheet::OnInitDialog () 
{
    BOOL bResult = CPropertySheet::OnInitDialog();
    int ids[] = { IDOK, IDCANCEL, ID_APPLY_NOW };
    CRect rectWnd;
    CRect rectBtn;
    
    GetWindowRect (rectWnd);
    GetDlgItem (IDOK)->GetWindowRect (rectBtn);
    
    int btnWidth = rectBtn.Width();
    int btnHeight = rectBtn.Height();
    int btnOffset = rectWnd.bottom - rectBtn.bottom;
    int btnLeft = rectWnd.right - rectWnd.left;

    rectWnd.bottom = rectBtn.top;
    rectWnd.right = rectWnd.right + btnWidth + btnOffset;
    MoveWindow(rectWnd);
    
    rectBtn.left = btnLeft;
    rectBtn.right = btnLeft + btnWidth;

    for (int i = 0; i < sizeof (ids) / sizeof (int); i++)
    {
        rectBtn.top = (i + 1) * btnOffset + btnHeight * i;
        rectBtn.bottom = rectBtn.top + btnHeight;
        GetDlgItem (ids [i])->MoveWindow (rectBtn);
    }
    
    return bResult;
}

三、改变属性页上的标签文字

首先修改TC_ITEM结构，然后用 SetItem 来修改标签文字，如下代码:

<span style="white-space:pre">	</span>TC_ITEM item;
<span style="white-space:pre">	</span>item.mask = TCIF_TEXT;
<span style="white-space:pre">	</span>item.pszText = "New Label";
<span style="white-space:pre">	</span>//Change the label of the first tab (0 is the index of the first tab)...
   <span style="white-space:pre">	</span>GetTabControl ()->SetItem (0, &item);

四、改变属性页标签文字的字体属性

代码如下:

<span style="white-space:pre">	</span>m_NewFont.CreateFont (14, 0, 0, 0, 800, TRUE, 0, 0, 1, 0, 0, 0, 0, _T("Arial") );
       GetTabControl()->SetFont (&m_NewFont);

五、在属性页标签上显示位图

可以用 CImageList 建立图像. 用 SetItem 来设置，如下代码所示:

BOOL CMyPropSheet::OnInitDialog ()
{
    BOOL bResult = CPropertySheet::OnInitDialog();

    m_imageList.Create (IDB_MYIMAGES, 13, 1, RGB(255,255,255));
    CTabCtrl *pTabCtrl = GetTabControl ();
    pTabCtrl->SetImageList (&m_imageList);
    
    TC_ITEM item;
    item.mask = TCIF_IMAGE;
    for (int i = 0; i < NUMBER_OF_TABS; i++)
    {
        item.iImage = i;
        pTabCtrl->SetItem (i, &item );
    }

    return bResult;
}

六、在属性页左下角显示位图

如下代码所示：

 void CMyPropSheet::OnPaint () 
{
    CPaintDC dc(this); // device context for painting
    
    int nOffset = 6;
    // load IDB_BITMAP1 from our resources
    CBitmap bmp;
    if (bmp.LoadBitmap (IDB_BITMAP1))
    {
        // Get the size of the bitmap
        BITMAP bmpInfo;
        bmp.GetBitmap (&bmpInfo);
        
        // Create an in-memory DC compatible with the
        // display DC we''re using to paint
        CDC dcMemory;
        dcMemory.CreateCompatibleDC (&dc);
        
        // Select the bitmap into the in-memory DC
        CBitmap* pOldBitmap = dcMemory.SelectObject (&bmp);
        
        // Find a bottom-left point for the bitmap in the client area
        CRect rect;
        GetClientRect (&rect);
        int nX = rect.left + nOffset;
        int nY = rect.top + (rect.Height () - bmpInfo.bmHeight) - nOffset;
        
        // Copy the bits from the in-memory DC into the on-
        // screen DC to actually do the painting. Use the centerpoint
        // we computed for the target offset.
        dc.BitBlt (nX, nY, bmpInfo.bmWidth, bmpInfo.bmHeight, &dcMemory, 
            0, 0, SRCCOPY);
        
        dcMemory.SelectObject (pOldBitmap);
    }

    // Do not call CPropertySheet::OnPaint() for painting messages
}

七、在属性页右下角显示3D文字Logo