Transparent Form in firemonkey with a stylebook

问题

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?

回答1:

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

回答2:

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

来源：https://stackoverflow.com/questions/50551160/transparent-form-in-firemonkey-with-a-stylebook