虚拟列表视图无法CDDS_ITEMPREPAINT c++
Virtual listview doesn't get CDDS_ITEMPREPAINT c++
我正试图根据在文本框上键入的内容更改列表视图项的颜色。当用户根据我使用的一些逻辑键入一些文本时,我有以下代码ListView_SetItemState(hList,wordid,LVIS_FOCUSED|LVIS_SELECTED,LVIS_FOCUSED| LVIS_SELECTED);
然后在我的WM_NOTIFY块上,我有这个;
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函数使用Sqlite填充我的虚拟列表视图。在我的ondraw函数中,我有这个
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
}
我收到了CDDS-PREPAINT消息,但我根本没有收到CDDS-ITEMPREPAINT消息。
我的Listview根据Spy++有这种风格
Windows样式(5021580D)
WS_CHILDWINDOW可见(_V)WS_VSCROLLWS_TABSTOPLVS_REPORTLVS_SINGLESELLVS_SHOWSELALWAYS
扩展样式(00000204)
WS_EX_LEFTWS_EX_ltreadingWS_EX_右滚动条WS_EX_NOPARENTNOTIFYWS_EX_CLIENTEDGE
如果控件在对话框中,则必须使用返回结果代码
SetWindowLongPtr(hWnd, DWLP_MSGRESULT, result);
然后从CCD_ 2自身返回CCD_。
我终于解决了这个问题。这是固定代码。首先,我添加了onchange notifier函数,这样我就可以检测更改以供选择。
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;
}
}
然后我也修改了我的自定义绘图功能。
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;
}
因此,基本上,我不是通过ListView消息来选择项目。相反,我将Query.WordID设置为我想要选择的项目,如果项目被选中(通过鼠标或编程),我会手动更改项目的颜色。
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