原先贴在QQ空间，汗！！
http://user.qzone.qq.com/382164370/infocenter#!app=2&pos=1334911186
http://user.qzone.qq.com/382164370/infocenter#!app=2&pos=1334840523
每天思考一点无聊的问题，又是接上一篇日记的列表框自绘，在上一个自绘里面图片是用WINDOWS自己画上去的，这次彻底的全部的自己绘制（包括文字），这样做的好处是图片上不会覆盖一层阴影影响美观，改动是下面的红色显示的代码片段，有一个问题不知道为什么，就是下面这句
GetSubItemRect(nItem, nSubItem, LVIR_ICON, rect);
得到的矩形rect的宽度总是比图片宽度大42像素(列表框在ICO模式时)，why？
只是在前面的基础上修改这两个函数。。。
///
// OnNMCustomdraw
void CListImageCtrl::OnNMCustomdraw(NMHDR *pNMHDR, LRESULT *pResult)
{
//LPNMCUSTOMDRAW pNMCD = reinterpret_cast<LPNMCUSTOMDRAW>(pNMHDR);
NMLVCUSTOMDRAW* pLVCD = reinterpret_cast<NMLVCUSTOMDRAW*>(pNMHDR);
//TRACE("CListImageCtrl::OnNMCustomdraw()");
// Take the default processing unless we set this to something else below.
*pResult = CDRF_DODEFAULT;
// First thing - check the draw stage. If it's the control's prepaint
// stage, then tell Windows we want messages for every item.
if (pLVCD->nmcd.dwDrawStage == CDDS_PREPAINT)
{
*pResult = CDRF_NOTIFYITEMDRAW;
}
else if (pLVCD->nmcd.dwDrawStage == CDDS_ITEMPREPAINT)
{
// This is the notification message for an item. We'll request
// notifications before each subitem's prepaint stage.
int nItem = static_cast<int> (pLVCD->nmcd.dwItemSpec);
int nSubItem = pLVCD->iSubItem;
CDC* pDC = CDC::FromHandle(pLVCD->nmcd.hdc);
CRect rect;
GetSubItemRect(nItem, nSubItem, LVIR_ICON, rect);
XLISTCTRLDATA *pXLCD = (XLISTCTRLDATA *) pLVCD->nmcd.lItemlParam;
ASSERT(pXLCD);
COLORREF crText = m_crWindowText;
COLORREF crBkgnd = m_crWindow;
if (pXLCD)
{
crText = pXLCD[nSubItem].crText;
crBkgnd = pXLCD[nSubItem].crBackground;
if (!pXLCD[0].bEnabled)
crText = m_crGrayText;
}
// store the colors back in the NMLVCUSTOMDRAW struct
pLVCD->clrText = crText;
pLVCD->clrTextBk = crBkgnd;
//draw image,
rect.left += 19;
rect.right -= 19;
DrawImage(nItem, nSubItem, pDC, crText, crBkgnd, rect, pXLCD);
//draw checkbox
if (pXLCD && (pXLCD[nSubItem].nCheckedState != -1))
DrawCheckbox(nItem, nSubItem, pDC, crText, crBkgnd, rect,pXLCD);
//draw text
GetSubItemRect(nItem, nSubItem, LVIR_LABEL, rect);
DrawText(nItem, nSubItem, pDC, crText, crBkgnd, rect, pXLCD);
*pResult = CDRF_SKIPDEFAULT; //we have done all the paint
}
else if (pLVCD->nmcd.dwDrawStage == (CDDS_ITEMPREPAINT | CDDS_SUBITEM))
{
*pResult = CDRF_DODEFAULT;
}
}
///
// DrawImage
int CListImageCtrl::DrawImage(int nItem,
int nSubItem,
CDC* pDC,
COLORREF crText,
COLORREF crBkgnd,
CRect rect,
XLISTCTRLDATA *pXLCD)
{
if (rect.IsRectEmpty())
{
return 0;
}
GetDrawColors(nItem, nSubItem, crText, crBkgnd);
CBrush bkBrush(crBkgnd);
CRgn rgn;
rgn.CreateRectRgn(rect.left,rect.top,rect.right,rect.bottom);
pDC->FrameRgn(&rgn,&bkBrush,2,2); //draw my border
int nGap = 0;
rect.left += 0;
CImageList* pImageList = GetImageList(LVSIL_SMALL);
if (pImageList)
{
SIZE sizeImage;
sizeImage.cx = sizeImage.cy = 0;
IMAGEINFO info;
int nImage = -1;
if (pXLCD)
nImage = pXLCD[nSubItem].nImage;
if (nImage == -1)
return 0;
if (pImageList->GetImageInfo(nImage, &info))
{
sizeImage.cx = info.rcImage.right - info.rcImage.left;
sizeImage.cy = info.rcImage.bottom - info.rcImage.top;
}
if (nImage >= 0)
{
if (rect.Width() > 0)
{
POINT point;
point.y = rect.CenterPoint().y - (sizeImage.cy >> 1);
point.x = rect.CenterPoint().x - (sizeImage.cx >> 1);
SIZE size;
size.cx = rect.Width() < sizeImage.cx ? rect.Width() : sizeImage.cx;
size.cy = rect.Height() < sizeImage.cy ? rect.Height() : sizeImage.cy;
// save image list background color
COLORREF rgb = pImageList->GetBkColor();
// set image list background color
pImageList->SetBkColor(crBkgnd);
pImageList->DrawIndirect(pDC, nImage, point, size, CPoint(0, 0));
pImageList->SetBkColor(rgb);
nGap = sizeImage.cx + 5;
}
}
}
return nGap;
}
