Virtual listview doesn't get CDDS_ITEMPREPAINT c++ - c++

Question

I am trying to change the color of listview item based on what I type on text box. When user type some text based on some logic I use I have below code
ListView_SetItemState(hList, wordid, LVIS_FOCUSED | LVIS_SELECTED, LVIS_FOCUSED | LVIS_SELECTED);
Then on my WM_NOTIFY block I have this;
case WM_NOTIFY:
{
NMHDR *pNMHDR= (NMHDR*)lParam;
switch(pNMHDR->code){
case LVN_GETDISPINFO:
OnGetdispinfo(pNMHDR);
break;
case NM_CUSTOMDRAW:
wmnot= OnDraw(pNMHDR);
return wmnot;
break;
}
return 0;
}
OnGetdispinfo function fills my virtual listview by using Sqlite. In my ondraw function I have this
int OnDraw (NMHDR* pNMHDR){
int nIndex,state;
int result;
NMLVCUSTOMDRAW* pLVCD = reinterpret_cast<NMLVCUSTOMDRAW*>( pNMHDR );
if (pLVCD->nmcd.hdr.hwndFrom==hList)
{
switch (pLVCD->nmcd.dwDrawStage)
{
case CDDS_PREPAINT:
result= CDRF_NOTIFYITEMDRAW;
break;
case CDDS_ITEMPREPAINT:
result=CDRF_NOTIFYSUBITEMDRAW;
break;
case CDDS_SUBITEM|CDDS_ITEMPREPAINT:
nIndex=pLVCD->nmcd.dwItemSpec;
state=ListView_GetItemState(hList,nIndex,LVIF_TEXT |LVIF_PARAM);
if(state&LVIS_SELECTED==LVIS_SELECTED)
{
pLVCD->clrTextBk=RGB(124,34,78);
return CDRF_NEWFONT;
}
result= CDRF_DODEFAULT;
break;
default:
result=CDRF_DODEFAULT;
break;
}
}
return result; // CDRF_DODEFAULT
}
I get CDDS_PREPAINT message but I don't get CDDS_ITEMPREPAINT message at all.
My Listview has this styles according to Spy++
Windows Styles (5021580D)
WS_CHILDWINDOW
WS_VISIBLE
WS_VSCROLL
WS_TABSTOP
LVS_REPORT
LVS_SINGLESEL
LVS_SHOWSELALWAYS
Extended Styles (00000204)
WS_EX_LEFT
WS_EX_LTRREADING
WS_EX_RIGHTSCROLLBAR
WS_EX_NOPARENTNOTIFY
WS_EX_CLIENTEDGE

Answer 1

If your control is in a dialog, you have to return your result code using:
SetWindowLongPtr(hWnd, DWLP_MSGRESULT, result);
and then return TRUE from the DlgProc itself.

Answer 2

I finally solved the problem. Here is the fixed code.
First of all I added onchange notifier function so that I can detect changes for selection.
void OnItemChange (LPARAM lParam)
{
LPNMLISTVIEW pNMListView = reinterpret_cast<LPNMLISTVIEW>(lParam);
if ((pNMListView->uChanged & LVIF_STATE)
&& (pNMListView->uNewState & LVNI_SELECTED))
{
ListView_RedrawItems(hList,Query.WordID,pNMListView->iItem);
ListView_RedrawItems(hList,pNMListView->iItem,Query.WordID);
Query.WordID=pNMListView->iItem;
//DO STUFF;
}
}
Then I modified my custom draw function as well.
LRESULT OnDraw (LPARAM lParam)
{
LPNMLVCUSTOMDRAW lplvcd = (LPNMLVCUSTOMDRAW)lParam;
int nIndex;
int state;
if (lplvcd->nmcd.hdr.hwndFrom!=hList)
return CDRF_DODEFAULT;
switch(lplvcd->nmcd.dwDrawStage)
{
case CDDS_PREPAINT : //Before the paint cycle begins
return CDRF_NOTIFYITEMDRAW;
case CDDS_ITEMPREPAINT:
return CDRF_NOTIFYSUBITEMDRAW;
case CDDS_POSTPAINT:
nIndex=lplvcd->nmcd.dwItemSpec;
state=lplvcd->nmcd.uItemState;
return CDRF_DODEFAULT;
case CDDS_SUBITEM | CDDS_ITEMPREPAINT:
nIndex=lplvcd->nmcd.dwItemSpec;
state=lplvcd->nmcd.uItemState;
if ( nIndex==Query.WordID) {
lplvcd->clrText = GetSysColor(COLOR_HIGHLIGHTTEXT);
lplvcd->clrTextBk = GetSysColor(COLOR_HIGHLIGHT);
return CDRF_NEWFONT;
}
else{
lplvcd->clrText = GetSysColor(COLOR_WINDOWTEXT);
lplvcd->clrTextBk = GetSysColor(COLOR_WINDOW);
return CDRF_NEWFONT;
}
default:
return CDRF_DODEFAULT;
}
return CDRF_DODEFAULT;
}
So basically, I am not selecting items by ListView Messages. Instead i set Query.WordID to the item I want to select and if the item is selected(either by mouse or programmatically) I manually change the color of the item.