TCheckBox transparent?
lazarus / 31-LCL

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Aidex · 2019-11-12 06:34

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.

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Aidex · 2019-11-12 06:52

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 · 2019-11-13 01:39

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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lainz · 2019-11-13 01:55

Bgracontrols has a custom checkbox control with transparency.

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wp · 2019-11-13 09:53

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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winni · 2019-11-13 10:00

Checkbox on a panel is transparent on gtk2 /Laz 2.06

Winni

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lainz · 2019-11-13 12:53

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 · 2019-11-13 14:35

Nice stuff.  Fully transparent on a Panel.