CListCtrl列表中,改写几列的文字颜色
在ListCtrl控件绘画前处理NM_CUSTOMDRAW消息。
告诉Windows我们想对每个Item处理NM_CUSTOMDRAW消息。当这些消息中的一个到来,告诉Windows我们想在每个SubItem的绘制前处理这个消息当这些消息到达,我们就为每个SubItem设置文字和背景的颜色。
void CMyDlg::OnCustomdrawMyList ( NMHDR* pNMHDR, LRESULT* pResult )
{
NMLVCUSTOMDRAW* pLVCD = reinterpret_cast<NMLVCUSTOMDRAW*>( pNMHDR ); // 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 ( CDDS_PREPAINT == pLVCD->nmcd.dwDrawStage )
{
*pResult = CDRF_NOTIFYITEMDRAW;
}
elseif ( CDDS_ITEMPREPAINT == pLVCD->nmcd.dwDrawStage )
{
// This is the notification message for an item. We'll request
// notifications before each subitem's prepaint stage.
*pResult = CDRF_NOTIFYSUBITEMDRAW;
}
elseif ( (CDDS_ITEMPREPAINT | CDDS_SUBITEM) == pLVCD->nmcd.dwDrawStage )
{
// This is the prepaint stage for a subitem. Here's where we set the
// item's text and background colors. Our return value will tell
// Windows to draw the subitem itself, but it will use the new colors
// we set here.
// The text color will cycle through red, green, and light blue.
// The background color will be light blue for column 0, red for
// column 1, and black for column 2.
COLORREF crText, crBkgnd;
if ( 0 == pLVCD->iSubItem )
{
crText = RGB(255,0,0);
crBkgnd = RGB(128,128,255);
}
elseif ( 1 == pLVCD->iSubItem )
{
crText = RGB(0,255,0);
crBkgnd = RGB(255,0,0);
}
else
{
crText = RGB(128,128,255);
crBkgnd = RGB(0,0,0);
}
// Store the colors back in the NMLVCUSTOMDRAW struct.
pLVCD->clrText = crText;
pLVCD->clrTextBk = crBkgnd;
// Tell Windows to paint the control itself.
*pResult = CDRF_DODEFAULT;
}
}
l clrTextBk的颜色只是针对每一列,在最后一列的右边那个区域颜色也还是和ListCtrl控件的背景颜色一致。l 当我重新看文档的时候,我注意到有一篇题目是“NM_CUSTOMDRAW (list view)”的文章,它说你可以在最开始的custom draw消息中返回CDRF_NOTIFYSUBITEMDRAW就可以处理SubItem了,而不需要在CDDS_ITEMPREPAINT绘画段中去指定CDRF_NOTIFYSUBITEMDRAW。但是我试了一下,发现这种方法并不起作用,你还是需要处理CDDS_ITEMPREPAINT段。
对ListCtrl在“绘画前”处理NM_CUSTOMDRAW消息。告诉Windows我们想在每个Item被画的时候获得NM_CUSTOMDRAW消息。当这些消息来临,告诉Windows我们想在你画完的时候获取NM_CUSTOMDRAW消息。当这些消息来到的时候,我们就重新画每一个Item的图标。
void CPanel3::OnCustomdrawList ( NMHDR* pNMHDR, LRESULT* pResult )
{
NMLVCUSTOMDRAW* pLVCD = reinterpret_cast<NMLVCUSTOMDRAW*>( pNMHDR );
*pResult = 0;
// If this is the beginning of the control's paint cycle, request
// notifications for each item.
if ( CDDS_PREPAINT == pLVCD->nmcd.dwDrawStage )
{
*pResult = CDRF_NOTIFYITEMDRAW;
}
else if ( CDDS_ITEMPREPAINT == pLVCD->nmcd.dwDrawStage )
{
// This is the pre-paint stage for an item. We need to make another
// request to be notified during the post-paint stage.
*pResult = CDRF_NOTIFYPOSTPAINT;
}
else if ( CDDS_ITEMPOSTPAINT == pLVCD->nmcd.dwDrawStage )
{
// If this item is selected, re-draw the icon in its normal
// color (not blended with the highlight color).
LVITEM rItem;
int nItem = static_cast<int>( pLVCD->nmcd.dwItemSpec );
// Get the image index and state of this item. Note that we need to
// check the selected state manually. The docs _say_ that the
// item's state is in pLVCD->nmcd.uItemState, but during my testing
// it was always equal to 0x0201, which doesn't make sense, since
// the max CDIS_ constant in commctrl.h is 0x0100.
ZeroMemory ( &rItem, sizeof(LVITEM) );
rItem.mask = LVIF_IMAGE | LVIF_STATE;
rItem.iItem = nItem;
rItem.stateMask = LVIS_SELECTED;
m_list.GetItem ( &rItem );
// If this item is selected, redraw the icon with its normal colors.
if ( rItem.state & LVIS_SELECTED )
{
CDC* pDC = CDC::FromHandle ( pLVCD->nmcd.hdc );
CRect rcIcon;
// Get the rect that holds the item's icon.
m_list.GetItemRect ( nItem, &rcIcon, LVIR_ICON );
// Draw the icon.
m_imglist.Draw ( pDC, rItem.iImage, rcIcon.TopLeft(),
ILD_TRANSPARENT );
*pResult = CDRF_SKIPDEFAULT;
}
}
}