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I have a application with multiple stylebooks containing styles from delphistyles.com. I want to add a trackbar to allow the user to change the transparency of the form at runtime like you can do in VCL with alphablend.

This post: AlphaBlend in FireMonkey says the following:

To make your form background semitransparent you should set form Transparency property to true and use Fill.Color with alpha value like $AAFFFFFF(with Fill.Kind = bkSolid). in this case form border becomes invisible (at least in Delphi XE2)

But how can I achieve this when my form has a stylebook?

Adriaan
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2 Answers2

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  1. Set TForm.Transparency to True
  2. Put TPanel on the form with Align = Content
  3. Use your TPanel as conteiner for all controls
  4. Use TPanel.Opacity for transparency
Dmitriy Nekrasov
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  • The opacity does nothing. It's barley visible no matter if you change the opacity. – Adriaan Jun 02 '18 at 16:55
  • Ahh I see my one style I was trying it on had a transparent panel as a style. Another thing is when the main form is transparent how can I go about making a titlebar for the user to drag the form? – Adriaan Jun 04 '18 at 18:16
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Another thing is when the main form is transparent how can I go about making a titlebar for the user to drag the form?

I use my own class TWindowMove for moving forms without titlebar. Thats a small demo project

Dmitriy Nekrasov
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