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  • listctrl绘制

     犯了一个小错,水平滚动时出现文字重影,所以改了下:

    错误在于,在遍历列时,我用

    	CRect rcColumn;
    	GetHeaderCtrl()->GetItemRect(i, &rcColumn);

    这是错误的,因为一旦水平滚动时,这样得到的rcColumn就会不确定,因为rcColumn是得到绘制区域left,right,这两个值不停变化,从而产生文字的重影

    所以改了下,改用GetColumn,因为它得到的是width,在水平滚动时,width是不会变化的。

    代码如下:

    	CDC dc;
    	CRect rc;
    	dc.Attach(lpDIS->hDC);
    	rc = lpDIS->rcItem;
    	CRect rcItem(rc);
    
    	//--draw bkgrand -------------------------------
    	if (lpDIS->itemState & ODS_SELECTED)
    	{   
    		dc.FillSolidRect(&rcItem,RGB(235, 235, 235));
    	}
    	else
    	{
    		dc.FillSolidRect(&rcItem,RGB(255, 255, 255));
    	}
    
    
    	TCHAR  szBuf[1024];
    	LVITEM lvi;
    	lvi.iItem =lpDIS->itemID;
    	lvi.iSubItem = 0;
    	lvi.mask = LVIF_TEXT | LVIF_IMAGE;
    	lvi.pszText = szBuf;
    	lvi.cchTextMax = 1024;
    	GetItem(&lvi);
    
    	CRect  rcIcon;
    	rcIcon.SetRectEmpty();
    
    	//-----draw image --------------------------------
    	CImageList* pImgList = GetImageList(LVSIL_NORMAL);
    	if(!pImgList)
    		pImgList = GetImageList(LVSIL_SMALL);
    	if(!pImgList)
    		pImgList = GetImageList(LVSIL_STATE);
    	if (pImgList&&lvi.iImage >=0)
    	{
    		IMAGEINFO ii = {0};
    		pImgList->GetImageInfo(lvi.iImage, &ii);
    		rcIcon = ii.rcImage ;
    		rcIcon.OffsetRect(rcItem.TopLeft()) ;
    		CPoint ptIcon;
    		ptIcon.x=rcIcon.left;
    		ptIcon.y=rcIcon.top;
    		pImgList->Draw(&dc, lvi.iImage, ptIcon, ILD_TRANSPARENT);
    	}
    
    	//---draw text ------------------------------------
    	dc.ExcludeClipRect(rcIcon) ;
    	CRect rcText(rc);
    	if (!rcIcon.IsRectEmpty())
    	{
    		rcText.left = rcIcon.right;
    	}
    
    	LVCOLUMN lvc={0};
    	lvc.mask = LVCF_WIDTH;
    
    	LVCOLUMN lvcPre={0};
    	lvcPre.mask = LVCF_WIDTH;
    
    	int nColumn = GetHeaderCtrl()->GetItemCount();
    	for (int i=0; i<nColumn; i++)
    	{
    		//CRect rcColumn;
    		//GetHeaderCtrl()->GetItemRect(i, &rcColumn);
    		GetColumn(i, &lvc);
    
    		if (i>0)
    		{
    			GetColumn(i-1, &lvcPre);
    			rcText.left += lvcPre.cx;	//
    		}
    		rcText.right = rcText.left + lvc.cx;	
    
    		dc.SetBkMode(TRANSPARENT);
    		if (lpDIS->itemState & ODS_SELECTED)
    		{
    			dc.SetTextColor(RGB(255, 0, 0));
    		}
    		else
    		{
    			dc.SetTextColor(RGB(128, 128, 128));	
    		}
    		CString szItem;
    		szItem = GetItemText(lpDIS->itemID, i);
    		dc.DrawText(szItem, &rcText, DT_LEFT|DT_SINGLELINE|DT_VCENTER);
    	}
    
    	dc.Detach();


      

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  • 原文地址:https://www.cnblogs.com/hgy413/p/3693593.html
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