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Author Topic: TCheckBox transparent?  (Read 1011 times)

Aidex

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TCheckBox transparent?
« on: November 12, 2019, 07:34:02 am »
Moin!
Is it possible to make the text background of a CheckBox transparent?
I tried it with .Color:=clNone, but then the text background becomes white.
I need a CheckBox with a transparent background because my self-drawn window contains a color gradient.

I'm using Lazarus 2.0.6 on Windows.
« Last Edit: November 12, 2019, 08:18:21 am by Aidex »

Aidex

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Re: TCheckBox transparent?
« Reply #1 on: November 12, 2019, 07:52:30 am »
On a Delphi website I just found the suggestion to label the CheckBox with a TLabel instead.
This seems to be the easiest and quickest solution.
But I would be interested to know why it is not possible to make a CheckBox transparent.

jamie

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Re: TCheckBox transparent?
« Reply #2 on: November 13, 2019, 02:39:54 am »
If you have a self drawn surface then you can also self draw the check box..  :D

If you want to play some UF8 stuff, there is a ready made font character that has a Check mark that
you can print.

 Or you could do what many do and that is to have an ICON image of the checked and unchecked state.
The only true wisdom is knowing you know nothing

lainz

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Re: TCheckBox transparent?
« Reply #3 on: November 13, 2019, 02:55:22 am »
Bgracontrols has a custom checkbox control with transparency.
https://lainz.github.io/
Download LazPaint https://lazpaint.github.io/
Download BGRABitmap and BGRAControls https://github.com/bgrabitmap

wp

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Re: TCheckBox transparent?
« Reply #4 on: November 13, 2019, 10:53:20 am »
Strangely enough, the Checkbox DOES have transparent background when placed directly on a form. On a panel, however, the text is opaque. And I looked at Delphi 7 and XE 10.3: Here the Checkbox caption is transparent both on form and panel in both versions. (All tests done on Win 10).

So, this looks like a bug to me. You should file a bug report.
Mainly Lazarus trunk / fpc 3.2.0 / all 32-bit on Win-10, but many more...

winni

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Re: TCheckBox transparent?
« Reply #5 on: November 13, 2019, 11:00:33 am »
Checkbox on a panel is transparent on gtk2 /Laz 2.06

Winni

lainz

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Re: TCheckBox transparent?
« Reply #6 on: November 13, 2019, 01:53:04 pm »
Indeed, it's transparent, tested on Windows 10, also with a vertical gradient as background.

Edit: And BGRAControls one is not transparent, checked that too, seems that we inherited from TCustomControl to handle focus...
https://lainz.github.io/
Download LazPaint https://lazpaint.github.io/
Download BGRABitmap and BGRAControls https://github.com/bgrabitmap

fmc

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Re: TCheckBox transparent?
« Reply #7 on: November 13, 2019, 03:35:34 pm »
Nice stuff.  Fully transparent on a Panel.
Win X Pro / Lazarus 2.0.6 / FPC 3.0.4

 

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