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TCheckBox transparent?
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Topic: TCheckBox transparent? (Read 1208 times)
Aidex
Jr. Member
Posts: 66
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
»
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Aidex
Jr. Member
Posts: 66
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.
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jamie
Hero Member
Posts: 4195
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..
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.
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The only true wisdom is knowing you know nothing
lainz
Hero Member
Posts: 3960
Leandro Diaz
Re: TCheckBox transparent?
«
Reply #3 on:
November 13, 2019, 02:55:22 am »
Bgracontrols has a custom checkbox control with transparency.
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wp
Hero Member
Posts: 8108
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.
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Mainly Lazarus trunk / fpc 3.2.0 / all 32-bit on Win-10, but many more...
winni
Hero Member
Posts: 2201
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
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lainz
Hero Member
Posts: 3960
Leandro Diaz
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...
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fmc
New Member
Posts: 37
Re: TCheckBox transparent?
«
Reply #7 on:
November 13, 2019, 03:35:34 pm »
Nice stuff. Fully transparent on a Panel.
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Win X Pro / Lazarus 2.0.6 / FPC 3.0.4
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