[DUG] Assigned image to SpeedButton not transparent

[Ross Levis]

Using D7/themes, I have a TSpeedButton which is a toggle and I need to
display 2 different glyphs in a TSpeedButton based on whether the button was
clicked or right-clicked, as they do 2 slightly different things.

 

So I need to assign a glyph to the button at run time, which works, but
nothing I do makes the image transparent. There is always a white square
with the icon in the middle. It only looks correct if I assign one of the
images to the Glyph property at design time.

 

I use a TImageList to store the 2 images, and assign them like this as
required.

 

BitMap := TBitMap.Create;

ImageList.GetBitmap(n,BitMap);

SpeedButton.Glyph := BitMap;

BitMap.Free;

 

where n is 0 or 1.

 

I've tried setting Bitmap.Transparent to true and other combinations like
TransparentMode and TransparentColor but nothing makes any difference.

 

There is some sort of transparency happening since the images have quite a
colorful background but this appears as white on the button.

 

As a test I assigned the image from a filename Button.Glyph.LoadFromFile()
and this works correctly and looks good, but I don't want to distribute BMP
files separately.

 

A possible alternative I haven't tried is embedding the 2 images as a
resource in the EXE file and using Button.Glyph.LoadFromResourceName (or
ResourceID), but that seems a lot of work.  I thought I would try here to
see if anyone knows how to resolve the current method.

 

Cheers,

Ross.

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