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plurals

PO
primarykey
Id
11838365
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2012-08-07T02:05:51.740
FavoriteCount
0
LastActivityDate
2012-08-07T04:40:04.643
LastEditDate
2012-08-07T04:40:04.643
LastEditorUserId
65863
OwnerUserId
65863
ParentId
11837865
PostTypeId
2
Score
4
ViewCount
0
LastEditorDisplayName
text
Body
The <code>TForm.AlphaBlend</code> property applies to the entire <code>TForm</code> as a whole. What you need is per-pixel alpha-blending instead, which <code>TForm</code> does not natively support. You could call <code>UpdateLayeredWindow()</code> to implement per-pixel alpha, but that may conflict with the VCL's use of <code>SetLayeredWindowAttributes()</code>. For a purely VCL solution, you could try using two <code>TForm</code> objects. Have one <code>TForm</code> contain just the <code>TImage</code> and no background, then have a second <code>TForm</code> lay on top of it, where the second <code>TForm</code> has both its <code>TransparentColor</code> and <code>AlphaBlend</code> properties enabled, has a square of the <code>TransparenColorValue</code> that is the same dimensions as the <code>TImage</code>, and has a dark background color that gets alpha-blended with whatever is underneath it. An alternative solution would be to use the Win32 API <code>CreateWindowEx()</code> function directly to create the image window, then you can use <code>UpdateLayeredWindow()</code> on it. That requires you to create an in-memory bitmap to back the window drawing, so you can draw your image directly on to that bitmap, rather than using a <code>TImage</code> component. Then you just give it a dark background and specify a per-pixel alpha for the bitmap pixels surrounding the image pixels. BTW, you can put a <code>TImage</code> on top of a <code>TListView</code>, if you set the <code>TListView</code> as the <code>TImage.Parent</code>. You just won't be able to alpha-blend the <code>TImage</code>, that's all.
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1. POSemi-transparent layer over ListView in Delphi?
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PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USRemy Lebeau
UserOwnerUserId
1. USRemy Lebeau
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2. VO
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