Document how to change imgui theme about pyimgui

[scotty007]

Easy thing, just override colors in the active style as @ChristopherDumas suggested:

style = imgui.get_style() # override active style
imgui.style_colors_dark(style) # optional: set base colors from "Dark" (or any other) style
# set red, green, blue and alpha color components for style colors you wanna change
style.colors[imgui.COLOR_BORDER] = (r, g, b, a)
style.colors[imgui.COLOR_TITLE_BACKGROUND] = (r, g, b, a)
style.colors[imgui.COLOR_TITLE_BACKGROUND_ACTIVE] = (r, g, b, a)
...

[lenormf]

As far as I could tell, the array of colors isn't bound to, so it doesn't seem to be possible (yet).

I'd like to have that feature though!

[Glench]

@swistakm is there any word on this?

[swistakm]

I didn’t researched that yet. Core library definitely allows for that but I don’t know if it’s through it’s API or through some INI file. I’m right now on vacation so I can’t check it by myself. Of course any help and PRs would be really appreciated if someone want to contribute the support for themes.

[alexispurslane]

As far as I understand, ImGUI uses the GetStyle function to return a style object. Then you modify that object (for changing colors there is a colors array property on the object). Alternately, you can use the PushStyleColor function to directly change the color of a particular element in the colors array. So to get this working in pyimgui we'd need to either implement get_style or push_style_color functions. I think. I'd be willing to try doing this, since I really want this functionality for something I'm working on too.

[swistakm]

Contribution in that matter would be highly appreciated :). I would gladly review a PR.

Also, most of the pieces to get this working are already there. There is already GuiStyle class in core.pyx file that wraps the ImGuiStyle class and there are functions to modify individual style/color variables. Individual functions work but changes to the global style object (obtained with imgui.get_style()) unfortunately don't seem to propagate. This should work already but clearly something is missing. Would be great if someone could investigate this.

Also documentation is missing.

[swistakm]

OK. It seems I've found the issue behind GuiStyle classes. There is #112 PR where this is fixed.

So this will be working in next (1.0.0) release. The only thing we need is proper theming documentation.

[swistakm]

I have changed the tittle of this issue to Document how to change imgui theme as this is now only matter of proper documentation. I am also changing the milestone of this issue.

[Crunchyrocks]

How to make check boxes red? same with drop downs? and other toggles , and other buttons?