I have my own CMFCListCtrl derived class where I implemented the
virtual COLORREF OnGetCellTextColor(int nRow, int nColum)
{
CMyClass* pMyClass = (CMyClass*)GetItemData(nRow);
if (pMyClass && pMyClass->m_bDeleted)
return RGB(255, 0, 0);
return __super::OnGetCellTextColor(nRow, nColum);
}
function for marking red the deleted entries. This works except when a item is selected.
I went to the void CMFCListCtrl::OnCustomDraw(NMHDR* pNMHDR, LRESULT* pResult)
function and placed a breakpoint with the condition iRow==selected item
on the line
lplvcd->clrText = OnGetCellTextColor(iRow, iColumn);
executed it, then I created a new Data Breakpoint for &lplvcd->clrText
.
The Data Breakpoint got hit on function
comctl32.dll!SHThemeComputeTextColors()
, as the callstack image shows:
, which is clearly overriding the variable value.
As I search for SHThemeComputeTextColors
on Internet and nothing appears, can somebody help me on forcing the selected items text to be red?
Changing the colors and fonts of highlighted items is trickier than it seems, because highlighting selected items is a system-wide issue. In fact, it was something I had delayed for a long time, and just today I've finally tackled...
There are at least two ways to change the looks of a list control: owner draw (you have to do all the drawing yourself) and custom draw (the system tells you when it is about to do some steps of the drawing and lets you change the color, the font, etc.). This answer is about custom draw. This article covers the basics of using Custom Draw with CListCtrl.
How to change the highlight color in a CListCtrl (not a CMFCListCtrl, we'll get to that soon) is explained in this other article. These are the steps you have to do:
So, when the listview is about to draw a highlighted row, you have to telll the system the row is not highlighted so it doesn't use the system colors to paint it, tell what color to use, and set the item as highlighted again, so the selection works as usual.
Here is the code from that article:
This works fine with a CListCtrl, but you are asking about a CMFCListCtrl. The problem is that CMFCListCtrl is already asking to be notified about NM_CUSTOMDRAW notifications (that's when it calls the
OnGetCellTextColor
function, as you've seen). If you create a handler for that in your own CMFCListCtrl-derived class, those notifications won't get to CMFCListCtrl and you lose that functionality (it may fine, depending on your needs).So here is what I've done: I've created a NM_CUSTOMDRAW handler in my list control and, if I'm dealing with a highlighted row, I change the colors, otherwise, I call CMFCListCtrl::OnNMCustomDraw(). As you'll see, I just use the normal highlight colors; that's because I just wanted to see the selected items even when the control doesn't have the focus:
I haven't tested it thoroughly, but it seems to work.
UPDATE:
There is a little problem. When you call EnableHigilighting(), the dialog will get LVN_ITEMCHANGED notifications, which can trigger a redraw, which will trigger a LVN_ITEMCHANGED notification... So if you are listening to LVN_ITEMCHANGED notifications, you might need to do something like this: