在这里...按照建议创建一个 ImageList,将您的图标制作成一个 16 像素高、16*n 长的位图,其中 n= 图标的数量...
将背景颜色设置为 255、0、255,就像您所做的那样。
然后,加载它,并将其添加到图像列表中,就像我在这里所做的那样:
m_ImageList.Create(16, 16, ILC_COLOR16 | ILC_MASK, 7, 1);
CBitmap bm;
bm.LoadBitmap(IDB_SUPERTREEICONS);
m_ImageList.Add(&bm, RGB(255, 0, 255));
GetTreeCtrl().SetImageList(&m_ImageList, TVSIL_NORMAL);
当然,这是用 MFC 编写的,但如您所知,它只是 Win32 的包装器......
除此之外,您将不得不使用自定义绘制控件,在该控件中,您可以在图标恰好位于的任何背景上绘制图标。据我所知,在这些控件中实际上没有任何神奇的“透明”颜色。
在自定义绘图的情况下,您需要使用如下代码:
#define TRANSPARENT_COLOR (255,0,255)
UINT iBitmap = IDB_ICON_UP
CDC *dc = GetDC();
int x = 0, y = 0;
CDC *pDisplayMemDC = new CDC;
CDC *pMaskDC = new CDC;
CDC *pMemDC = new CDC;
CBitmap *pBitmap = new CBitmap;
CBitmap *pMaskBitmap = new CBitmap;
CBitmap *pMemBitmap = new CBitmap;
int cxLogo, cyLogo;
BITMAP bm;
pBitmap->LoadBitmap(iBitmap);
pDisplayMemDC->CreateCompatibleDC(dc);
CBitmap *pOldBitmap = (CBitmap *)pDisplayMemDC->SelectObject(pBitmap);
pBitmap->GetObject(sizeof(bm), &bm);
cxLogo = bm.bmWidth;
cyLogo = bm.bmHeight;
pMaskBitmap->CreateBitmap(cxLogo, cyLogo, 1, 1, NULL);
pMaskDC->CreateCompatibleDC(dc);
CBitmap *pOldMask = (CBitmap *)pMaskDC->SelectObject(pMaskBitmap);
COLORREF oldBkColor = pDisplayMemDC->SetBkColor(TRANSPARENT_COLOR);
pMaskDC->BitBlt(0, 0, cxLogo, cyLogo, pDisplayMemDC, 0, 0, SRCCOPY);
pMemBitmap->CreateCompatibleBitmap(dc, cxLogo, cyLogo);
pMemDC->CreateCompatibleDC(dc);
CBitmap *pOldMem = (CBitmap *)pMemDC->SelectObject(pMemBitmap);
pMemDC->BitBlt(0, 0, cxLogo, cyLogo, dc, x, y, SRCCOPY);
pMemDC->BitBlt(0, 0, cxLogo, cyLogo, pDisplayMemDC, 0, 0, SRCINVERT);
pMemDC->BitBlt(0, 0, cxLogo, cyLogo, pMaskDC, 0, 0, SRCAND);
pMemDC->BitBlt(0, 0, cxLogo, cyLogo, pDisplayMemDC, 0, 0, SRCINVERT);
dc->BitBlt(x, y, cxLogo, cyLogo, pMemDC, 0, 0, SRCCOPY);
delete pMemDC->SelectObject(pOldMem);
delete pMemDC;
delete pMaskDC->SelectObject(pOldMask);
delete pMaskDC;
delete pDisplayMemDC->SelectObject(pOldBitmap);
delete pDisplayMemDC;
此代码决定在哪里绘制图标,并拍摄背景快照,为图标创建蒙版,然后将其绘制在背景上,使其成为完全透明的背景......
希望能有所帮助。如果没有,请更详细地解释您要实现的目标,以及您所看到的或未看到的...