Re: [Lazarus] Color and transparancy selection ?

[Anthony Walter via Lazarus]

I've written a pascal version of some color controls which I've ported to
Lazarus. Here is a link to a page with demo video:

https://www.codebot.org/delphi/?doc=9524

These controls includes a hue picker that has 2 styles (radial as shown and
bar), a saturation pick again with 2 styles, and an alpha picker. I also
have a color value slider edit box, where you can type out a R, G, B values
in bytes or floats, and it has a drop down with a left right slider that
shows you the colors.

They should be enough to create a decent pascal native color picker. Quick
example, adding the alpha picker and drop down edit is trivial:

https://s3.amazonaws.com/cache.codebot.org/videos/color-lazarus-example.mp4
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Re: [Lazarus] Color and transparancy selection ?

[Vojtěch Čihák via Lazarus]

Hello,
 
native TColorDialog in Qt4 has slider and edit for Alpha channel but this value 
is never in the result (i.e. TColorDialog.Color property). TColor uses upper 8 
bits for other purposes than alpha.
 
V.
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Od: Michael Van Canneyt via Lazarus 
Komu: Lazarus mailing list 
Datum: 22.03.2018 20:49
Předmět: [Lazarus] Color and transparancy selection ?



Hello,

Is there a version of TColorDialog which allows to specify an Alpha channel ?

Michael.
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Re: [Lazarus] Color and transparancy selection ?

[Werner Pamler via Lazarus]

Am 22.03.2018 um 21:36 schrieb Ondrej Pokorny via Lazarus:


Not in the LCL itself. Maybe you can try to build one using 
http://wiki.lazarus.freepascal.org/mbColorLib#RGB_color_pickers


I did the port to Lazarus. But no - none of them supports an alpha 
channel, they focus on color selection based on a variety of color 
models. Maybe you should have a look at BGRABitmap and associated controls.


Looking at the demo of the mbColorLib again after some time I see now a 
terrible flicker on Windows. Ondrej, I fear your change in 
double-buffering killed a majority of third-party components. It may 
take some time until all authors will fix this (and most of them left 
their babies...).


Werner

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Re: [Lazarus] Color and transparancy selection ?

[Michael Van Canneyt via Lazarus]

On Thu, 22 Mar 2018, Ondrej Pokorny via Lazarus wrote:


On 22.03.2018 20:49, Michael Van Canneyt via Lazarus wrote:
Is there a version of TColorDialog which allows to specify an Alpha 
channel ?


Not in the LCL itself. Maybe you can try to build one using 
http://wiki.lazarus.freepascal.org/mbColorLib#RGB_color_pickers


I didn't use it myself, it just popped up in a Google search.


Hm. I didn't find that. Must have used the wrong terms. 
However, none of them seems to support Alpha.


It looks like I will have to make one myself :(

Michael.
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Re: [Lazarus] Color and transparancy selection ?

[Ondrej Pokorny via Lazarus]

On 22.03.2018 20:49, Michael Van Canneyt via Lazarus wrote:
Is there a version of TColorDialog which allows to specify an Alpha 
channel ?


Not in the LCL itself. Maybe you can try to build one using 
http://wiki.lazarus.freepascal.org/mbColorLib#RGB_color_pickers


I didn't use it myself, it just popped up in a Google search.

Ondrej
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[Lazarus] Color and transparancy selection ?

[Michael Van Canneyt via Lazarus]

Hello,

Is there a version of TColorDialog which allows to specify an Alpha channel ?

Michael.
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