NM_CUSTOMDRAW Failing On ListView

Question

Part of my evil plans involve custom-drawing the holy living crap out of a ListView control.

The ListView on the left works fine; the blue lines come from that pcdListViewDraw->clrTextBk = RGB( 0xE5, 0xF5, 0xFF ); line of code.
But the ListView on the right goes into if ( pcdListViewDraw->nmcd.dwDrawStage == CDDS_PREPAINT ) {, which always returns CDRF_NOTIFYITEMDRAW, but then nothing more.
It never goes into if ( pcdListViewDraw->nmcd.dwDrawStage == CDDS_ITEMPREPAINT ) {

I’m not sure what else to say about them since there aren’t really any differences. They are both children of main windows, not dialog boxes, so there is no difference in how their return codes are handled. Both have LVS_OWNERDATA and respond to LVN_GETDISPINFOW to draw their texts. I can’t see any reason they would be drawn differently.

The code is simple:

					case NM_CUSTOMDRAW : {  
						LPNMCUSTOMDRAW pcdCustomDraw = reinterpret_cast<LPNMCUSTOMDRAW>(_lParam);  
						CWidget * pmwSrc = LSW_WIN2CLASS( pcdCustomDraw->hdr.hwndFrom );  
						if ( pmwSrc ) {  
							if ( pmwSrc->IsListView() ) {  
								LPNMLVCUSTOMDRAW pcdListViewDraw = reinterpret_cast<LPNMLVCUSTOMDRAW>(_lParam);  
								HWND hFrom = pcdCustomDraw->hdr.hwndFrom;  
								if ( pcdListViewDraw->nmcd.dwDrawStage == CDDS_PREPAINT ) {  
									return CDRF_NOTIFYITEMDRAW;  
								}  
								if ( pcdListViewDraw->nmcd.dwDrawStage == CDDS_ITEMPREPAINT ) {  
									if ( pcdListViewDraw->nmcd.dwItemSpec % 2 == 0 ) {  
										pcdListViewDraw->clrText = ::GetSysColor( COLOR_WINDOWTEXT );  
										pcdListViewDraw->clrTextBk = RGB( 0xE5, 0xF5, 0xFF );  

										return CDRF_NEWFONT;  
									}  
								}  
							}  
						}  
						return 1;  
					}  

What could cause an evil ListView to go into dwDrawStage == CDDS_PREPAINT, which always returns CDRF_NOTIFYITEMDRAW, and then to not go into dwDrawStage == CDDS_ITEMPREPAINT?

L. Spiro

Answer 1

The one on the left has the following styles:

WS_CHILDWINDOW  
WS_VISIBLE  
WS_TABSTOP  
LVS_REPORT  
LVS_SHOWSELALWAYS  
LVS_ALIGNLEFT  
LVS_OWNERDATA  
LVS_NOSORTHEADER  
  
WS_EX_LEFT  
WS_EX_LTRREADING  
WS_EX_RIGHTSCROLLBAR  
WS_EX_TRANSPARENT  
WS_EX_CLIENTEDGE  
WS_EX_CONTROLPARENT  
LVS_EX_FULLROWSELECT  
LVS_EX_DOUBLEBUFFER  

The one on the right has the following styles:

WS_CHILDWINDOW  
WS_VISIBLE  
WS_VSCROLL  
WS_HSCROLL  
WS_TABSTOP  
LVS_REPORT  
LVS_SHOWSELALWAYS  
LVS_ALIGNLEFT  
LVS_OWNERDATA  
  
WS_EX_LEFT  
WS_EX_LTRREADING  
WS_EX_RIGHTSCROLLBAR  
WS_EX_TRANSPARENT  
WS_EX_CONTROLPARENT  
LVS_EX_FULLROWSELECT  
LVS_EX_DOUBLEBUFFER  

Both are class “SysListView32”.

L. Spiro

Answer 2

pcdListViewDraw->nmcd.dwDrawStage is always set to 1 (CDDS_PREPAINT) for the right list view.
It’s not that I am not catching the correct second value, it simply never comes back into this NM_CUSTOMDRAW section. No matter what I return. I’ve tried ::SetWindowLongPtrW( _hWnd, DWLP_MSGRESULT, CDRF_NOTIFYITEMDRAW ); even though this isn’t a dialog and still nothing.

Why is this not working?

L. Spiro