C++ (Cpp) cDc Examples

Example #1

File: TreeCtrlEx.cpp Project: shergin/downright

CImageList *CTreeCtrlEx::CreateDragImageEx(HTREEITEM hItem)
{
	CRect	rect;	
	GetItemRect(hItem, rect, true );
	rect.left-=16+3;
	//
	// Create bitmap in memory DC
	//
	CClientDC	cDc(this);	
	CDC			cMemDC;	
	CBitmap		cBitmap;

	if(!cMemDC.CreateCompatibleDC(&cDc))		
		return NULL;	

	if(!cBitmap.CreateCompatibleBitmap(&cDc, rect.Width(),rect.Height()))
		return NULL;
	
	CBitmap* pOldMemDCBitmap=cMemDC.SelectObject( &cBitmap );

    cMemDC.BitBlt(
		0,
		0,
		rect.Width(),
        rect.Height(),
		&cDc, rect.left, rect.top, SRCCOPY);

	cMemDC.SelectObject( pOldMemDCBitmap );
	//
	// Create the imagelist	with the merged drag images
	//
	CImageList* pCompleteImageList = new CImageList;
	
	pCompleteImageList->Create(
		rect.Width(), 
		rect.Height(), 
		ILC_COLOR24 | ILC_MASK,0,1);

	pCompleteImageList->Add(&cBitmap,GetSysColor(COLOR_WINDOW)); 
	cBitmap.DeleteObject();

	return pCompleteImageList;
}

Example #2

File: PlayerListCtrl.cpp Project: Chris-Hood/mpc-hc

CImageList* CPlayerListCtrl::CreateDragImageEx(LPPOINT lpPoint)
{
    if (GetSelectedCount() <= 0) {
        return nullptr;
    }

    CRect cSingleRect, cCompleteRect(0, 0, 0, 0);
    GetClientRect(cSingleRect);
    int nWidth = cSingleRect.Width();

    // Start and Stop index in view area
    int nIndex = GetTopIndex() - 1;
    int nBottomIndex = GetBottomIndex();

    // Determine the size of the drag image (limited for
    // rows visible and Client width)
    while ((nIndex = GetNextItem(nIndex, LVNI_SELECTED)) != -1 && nIndex <= nBottomIndex) {
        GetItemRect(nIndex, cSingleRect, LVIR_BOUNDS);
        /*
        CRect r;
        GetItemRect(nIndex, r, LVIR_LABEL);
        cSingleRect.left = r.left;
        */
        if (cSingleRect.left < 0) {
            cSingleRect.left = 0;
        }
        if (cSingleRect.right > nWidth) {
            cSingleRect.right = nWidth;
        }

        cCompleteRect |= cSingleRect;
    }

    //
    // Create bitmap in memory DC
    //
    CClientDC cDc(this);
    CDC cMemDC;
    CBitmap cBitmap;

    if (!cMemDC.CreateCompatibleDC(&cDc)) {
        return nullptr;
    }

    if (!cBitmap.CreateCompatibleBitmap(&cDc, cCompleteRect.Width(), cCompleteRect.Height())) {
        return nullptr;
    }

    CBitmap* pOldMemDCBitmap = cMemDC.SelectObject(&cBitmap);
    // Here green is used as mask color
    cMemDC.FillSolidRect(0, 0, cCompleteRect.Width(), cCompleteRect.Height(), RGB(0, 255, 0));

    // Paint each DragImage in the DC
    nIndex = GetTopIndex() - 1;
    while ((nIndex = GetNextItem(nIndex, LVNI_SELECTED)) != -1 && nIndex <= nBottomIndex) {
        CPoint pt;
        CImageList* pSingleImageList = CreateDragImage(nIndex, &pt);

        if (pSingleImageList) {
            GetItemRect(nIndex, cSingleRect, LVIR_BOUNDS);

            pSingleImageList->Draw(&cMemDC,
                                   0,
                                   CPoint(cSingleRect.left - cCompleteRect.left, cSingleRect.top - cCompleteRect.top),
                                   ILD_MASK);

            pSingleImageList->DeleteImageList();
            delete pSingleImageList;
        }
    }

    cMemDC.SelectObject(pOldMemDCBitmap);

    //
    // Create the image list with the merged drag images
    //
    CImageList* pCompleteImageList = DEBUG_NEW CImageList;

    pCompleteImageList->Create(cCompleteRect.Width(),
                               cCompleteRect.Height(),
                               ILC_COLOR | ILC_MASK, 0, 1);

    // Here green is used as mask color
    pCompleteImageList->Add(&cBitmap, RGB(0, 255, 0));

    //
    // as an optional service:
    // Find the offset of the current mouse cursor to the image list
    // this we can use in BeginDrag()
    //
    if (lpPoint) {
        lpPoint->x = cCompleteRect.left;
        lpPoint->y = cCompleteRect.top;
    }

    return pCompleteImageList;
}