QT equivalent of CGradient and CGradientCtrl

[mrjj]

Hi
Im not sure what a CGradientCtrl does ? ( what it allows the user to do )

You can style any with a gradient.

even has an editor.

But not sure what a "Gamma slider." is.
My brain says like a QSlider with gradient on. but just guessing :)

[Perdrix]

So sorry I forgot to post the URL, so of course you won't know what it does:

https://www.codeproject.com/articles/2196/cgradient-and-cgradientctrl

D.

[mrjj]

@Perdrix
So its a control that allows the user to kinda edit the gradient, moving the PEGS around ?
Like the build-in editor ?

It seems to use palettes, is that important to you ?

[Perdrix]

Well not much like that editor, but sort of in concept at least. But it does more than that - when the use moves the pegs the application can be told that changes have been made. So if I wish to move the "grey" point in a gamma slider for the default position of sqrt(0.5) , I can do so and the application get to know the new position etc.. Or I can change the "black point" and be told that has changed as well.

Palettes, yes but that's a Windows CPalette which isn't very much like a QPalette ...

[mrjj]

@Perdrix
Hi
Hmm I have not seen such Widget im afraid. ( also did a google search but its all types of other sliders)

So it must allow color change and have movable PEGS that send a signal when moved.
Can user also add/remove pegs ?

You could reuse the editor for the PEGS part

https://code.woboq.org/qt5/qttools/src/shared/qtgradienteditor/

or try to port that class CGradientCtrl to Qt. I could not watch the code so not sure how much
it would take. You can reuse its structures but anything mouse related and colors would have to be changed.

[Perdrix]

Yes, User can add pegs as needed by double click - it's a pretty clever control. I looked at the Gradient control editor and it's not IMHO in the same league. You might be able to convert the MFC code to Qt, not sure I could!

[mrjj]

Hi
Update.
I found this

https://github.com/ctin/MultiSlider

That can have multiple handles. (as many as you like) Maybe this can be tweaked to do what you want ?

[SGaist]

Hi,

Do you mean something like shown in this cgradient demo project ?

[mrjj]

@SGaist
Yep, exactly that one. He links to it higher up.

[SGaist]

@mrjj said in QT equivalent of CGradient and CGradientCtrl:

@SGaist
Yep, exactly that one. He links to it higher up.

Sorry, I missed the link.

The multi slider you found looks like a good start.

[mrjj]

@SGaist
At least he would get the "PEGS" adding and movement for free.
So yeah, it could be, i hope.