Posted on 2009-12-29 17:02
S.l.e!ep.￠% 閱讀(482)
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VC
以前繪制 +/- 時是使用圖片，看到有人用代碼實現，轉貼之
繪制CTreeCtrl的+/-展開按鈕的代碼.
void?DrawExpandButton(?HDC?hdc,?LONG?x,?LONG?y,?BOOL?bExpand,?BOOL?bFill?)
{
????const?int?PROPTREEITEM_EXPANDBOX????????=?9;????????????//?按鈕大小
????const?int?PROPTREEITEM_EXPANDBOXHALF????=?(PROPTREEITEM_EXPANDBOX?/?2);
????HPEN?hPen;
????HPEN?oPen;
????HBRUSH?oBrush;
????hPen?=?CreatePen(PS_SOLID,?1,?GetSysColor(COLOR_BTNSHADOW));
????oPen?=?(HPEN)SelectObject(hdc,?hPen);
????oBrush?=?(HBRUSH)SelectObject(hdc,?GetStockObject(bFill???WHITE_BRUSH?:?NULL_BRUSH));
????Rectangle(hdc,?x,?y,?x?+?PROPTREEITEM_EXPANDBOX,?y?+?PROPTREEITEM_EXPANDBOX);
????SelectObject(hdc,?GetStockObject(BLACK_PEN));
????if?(!bExpand)
????{
????????MoveToEx(hdc,?x?+?PROPTREEITEM_EXPANDBOXHALF,?y?+?2,?NULL);
????????LineTo(hdc,?x?+?PROPTREEITEM_EXPANDBOXHALF,?y?+?PROPTREEITEM_EXPANDBOX?-?2);
????}
????MoveToEx(hdc,?x?+?2,?y?+?PROPTREEITEM_EXPANDBOXHALF,?NULL);
????LineTo(hdc,?x?+?PROPTREEITEM_EXPANDBOX?-?2,?y?+?PROPTREEITEM_EXPANDBOXHALF);
????SelectObject(hdc,?oPen);
????SelectObject(hdc,?oBrush);
????DeleteObject(hPen);
}