Preventing alphablend to affect children
lazarus / 39-Graphics

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phoenix27 · 2023-08-13 17:35

I' m making an app in which there are media thumbnails. When clicking
on a thumbnail i want this to happen:
A form overlay appears on top of the entire app and then if the thumb
refers to a video then a video starts playing, if to an image then a
bigger image appears.
The overlay must cover the entire app and use alphablend to make it
see-through.
The code for the overlay is:
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i procedure
TForm1.ShowOverlay(Form: TForm);var  Back: TForm;  //img32:
TImage32;begin  OverlayPnl := TForm.Create(nil);   
OverlayPnl.Position := poDesigned;    OverlayPnl.BorderStyle :=
bsNone;    OverlayPnl.AlphaBlend := true;   
OverlayPnl.AlphaBlendValue := 120;    OverlayPnl.Color := clBlack;   
OverlayPnl.SetBounds(Form.Left, Form.Top, Form.Width, Form.Height);  
 OverlayPnl.OnClick := pnlOverlayOnClick;    OverlayPnl.Show; end; The
problem is that the Tpanel (child of the OverlayPnl) and the vlc
player attached to it become semitransparent too. How can i prevent
this behavior and make the children opaque? I couldn't find anything.

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KodeZwerg · 2023-08-13 18:06

In the BGRA controls package is a VirtualScreen component, I havent
tried it yet but I think this would be able to do your requirements.

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paweld · 2023-08-14 08:48

create a form, in the size that results from the video / image size -
then you do not need to set AlphaBlend to True.