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我創建了一個所有者繪製列表框,並將其綁定爲如下所示的向量。最好的方式來告訴所有者繪製listbox重繪一個項目?
vector<wchar_t*> texts;
lbHWND = CreateWindowExW(NULL, WC_LISTBOX, NULL,
WS_CHILD | WS_BORDER | WS_VISIBLE | LBS_NODATA |
LBS_OWNERDRAWFIXED | LBS_NOTIFY | LBS_NOINTEGRALHEIGHT,
0, 0, 400, 400, tkHWND, (HMENU)IDC_LISTBOX_ENTRY, hInstance, 0);
SCROLLINFO lbSi = { 0 };
lbSi.cbSize = sizeof(SCROLLINFO);
lbSi.fMask = SIF_RANGE | SIF_PAGE | SIF_POS;
lbSi.nMin = 0;
lbSi.nMax = text.size();
lbSi.nPage = 20;
lbSi.nPos = 0;
SetScrollInfo(lbHWND, SB_VERT, &lbSi, TRUE);
SendMessageW(lbHWND, LB_RESETCONTENT, 0, 0);
SendMessage(lbHWND, LB_SETCOUNT, iTotal, 0);
LRESULT CALLBACK WndProc(HWND phwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_MEASUREITEM:
{
MEASUREITEMSTRUCT* lpmis = (LPMEASUREITEMSTRUCT)lParam;
switch (lpmis->CtlID)
{
case IDC_LISTBOX_ENTRY:
lpmis->itemHeight = 20;
break;
default:
break;
}
return TRUE;
}
case WM_DRAWITEM:
{
DRAWITEMSTRUCT* lpdis = (LPDRAWITEMSTRUCT)lParam;
if (lpdis->itemID == -1) return;
HBRUSH hb = NULL;
HPEN hp = NULL;
switch (lpdis->itemAction)
{
case ODA_SELECT:
case ODA_DRAWENTIRE:
SetBkMode(lpdis->hDC, TRANSPARENT);
hb = CreateSolidBrush(lpdis->itemState & ODS_SELECTED ? 0xf1f1f1 : 0xffffff);
hp = CreatePen(PS_SOLID, 1, lpdis->itemState & ODS_SELECTED ? 0xcfcfcf : 0xffffff);
SelectObject(lpdis->hDC, hp);
SelectObject(lpdis->hDC, hb);
Rectangle(lpdis->hDC, lpdis->rcItem.left, lpdis->rcItem.top, lpdis->rcItem.right, lpdis->rcItem.bottom);
TextOut(lpdis->hDC,
lpdis->rcItem.left + 5,
lpdis->rcItem.top + 2,
texts[i],
wcslen(texts[i]);
break;
}
if (hp) DeleteObject(hp);
if (hb) DeleteObject(hb);
}
}
}
現在假設我在texts
更新項目,你能告訴我一個很好的方式來告訴列表框重繪該項目?
目前,我使用下面的代碼:
texts[2] = L"Some text";
SendMessageW(lbHWND, LB_RESETCONTENT, 0, 0);
SendMessage(lbHWND, LB_SETCOUNT, iTotal, 0);
迫使列表框重繪所有項目,不僅是第三項。有一個更好的方法嗎?
好的解決辦法,謝謝:) – Sakura