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Tomasz Piasecki
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 Posted: Wed Oct 08, 2003 6:45 pm Post subject: TImageList::Draw changes TCanvas properties |
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Hi,
I have a problem with TImageList. Drawing image from image list on PaintBox
canvas using Draw method with Enabled=false, such as:
MyImageList->Draw(MyPaintBox->Canvas, xpos, ypos, imageindex, false);
causes chage to canvas state. For example text painted by TextOut on this
canvas after that has different background or is inverted. To make things
worse, even setting again Canvas->Pen->Color, Canvas->Brush->Color,
Canvas->TextMode, Canvas->CopyMode doesn't help much.
There's no problem with drawing enabled images from TImageList.
Any ideas?
TP.
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Damon Chandler (TeamB)
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| Posted: Sun Oct 12, 2003 2:26 am Post subject: Re: TImageList::Draw changes TCanvas properties |
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Tomasz,
| Quote: | MyImageList->Draw(MyPaintBox->Canvas, xpos, ypos, imageindex, false);
causes chage to canvas state. [snip]
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You're right. Unfortunately, the TImageList::Draw() method [specifically,
the virtual TCustomImageList::DoDraw() method] does change various
state-properties of the Canvas without restoring them. Try wrapping the
call to Draw() with the SaveDC() and RestoreDC() GDI functions...
HDC const hDC = PaintBox1->Canvas->Handle;
SaveDC(hDC);
ImageList1->Draw(PaintBox1->Canvas, 0, 0, 0, false);
RestoreDC(hDC, -1);
HTH,
Damon (TeamB)
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Tomasz Piasecki
Guest
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| Posted: Sun Oct 12, 2003 10:30 am Post subject: Re: TImageList::Draw changes TCanvas properties |
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Damon Chandler (TeamB) wrote:
| Quote: | You're right. Unfortunately, the TImageList::Draw() method [specifically,
the virtual TCustomImageList::DoDraw() method] does change various
state-properties of the Canvas without restoring them. Try wrapping the
call to Draw() with the SaveDC() and RestoreDC() GDI functions...
Thanks, this workaround works fine. |
TP.
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