🚀 go-pugleaf

John B wrote:

> As I understand it, TSpeedButton can accept images with multiple
> glyphs (eg., 1x1, 1x2, 1x3, or 1x4) to represent the different states
> of the TSpeedButton.  It can also use a TImageList and a reference to
> display glyphs.  Is there a way to use a TImageList or some other
> similar component with different sized images to take advantage of
> this feature?

A TSpeedbutton cannot use an image list *directly*. It can be tied to
an imagelist through an action, though. With a bit of fiddling you can
get it to use "multiple glyph" images from an imagelist. This can be
done the following way:

Drop a TImagelist on the form and set it Height to 16 and the Width to
32. Doubleclick on it and use the imagelist editor to add some of the
button glyphs from the images that come with Delphi to the list. Note
that these bitmaps need to be 16*32, you cannot load two 16*16 images
and get the imagelist to treat them as one image. Assign this imagelist
to a TActionlist, add a few actions, set the actions ImageIndex as
needed, drop a couple of speedbuttons or bitbuttons, assign the actions
to each and then set the NumGlyphs property of the buttons to 2. That
is the step not done automatically. The result works as intended
because the buttons make an internal copy of the imagelist image into
their Glyph property (inefficient and wasteful of resources, but that
was the easiest way to implement it in a way that also allows the
buttons to be used without associated actions).

If you want to start with two 16*16 images your best bet is to create
another imagelist (16*16 this time) and load the images into it in the
correct sequence. Then use code to create 16*32 images from those at
run-time and deposit them into a new imagelist set to 16*32 size, then
tie that to the actionlist and set the NumGlyphs properties as
required, also in code. Same applies to 16*48 or 16*64 images, of
course, but you have to decide on one format to use, since a given
imagelist can only hold images that are all of the same size, and an
actionlist can only be tied to one imagelist. Supporting a mixture of
sizes would be a bit cumbersome since you would need a separate
actionlist + imagelist for every image size you want to use.



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Peter Below (TeamB)  
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