feat(theming): add qimgv template

[HANDZCZ]

Pull Request

Motivation

Adds theme template for qimgv.

Type of Change

Mark the relevant option with an "x".

• Bug fix
• New feature
• Breaking change
• Refactoring

Related Issue

Testing

Tested with multiple predefined color schemes.

• Tested on niri
• Tested on Hyprland
• Tested on sway
• Tested with different bar positions and density settings
• Tested at different interface scaling values
• Tested with multiple monitors (if applicable)

Screenshots / Videos

Checklist

• Code follows project style guidelines
• Self-reviewed my code
• No new warnings or errors
• Documentation or comments updated (if relevant)

Additional Notes

If you can, please check that the theme looks somewhat decent and is similar to other apps.
Also, I couldn't find anything about hot-reloading the theme, so it only updates when relaunching the app.

[ItsLemmy]

This seems to be Qt app, how was it looking without a custom template? In theory it should follow Qt theming.
We only want to offer the common apps as built int templates the other more niche one should be user-templates to avoid cluttering the UI and codebase.

[HANDZCZ]

This is on Eldritch color scheme when "use system colors" is on:

Scroll level is not visible, has wrong text color and background color:

Background is inconsistent, black when viewing the picture, and the right color when browsing folders, outline for the popups is missing (wrong color):

Forgot to add how it looks when themed...

Folders have this whiteish color, which is really bright on a dark theme:

[ItsLemmy]

have you tried to see if this was fixable on the main Qt template ?

[HANDZCZ]

I can try, but I thought that the Qt template was "final" and qimgv is using it wrong.

Ok, I just looked, and qimgv is not even setting the background color or overlay text/background color, so it is 0x000000.
It uses the same color for the popup and its border.
Here is the color definition part: https://github.com/easymodo/qimgv/blob/master/qimgv/themestore.cpp#L9-L18
Basically, the entire "use system theme" option is almost unusable for actual theming.

It also doesn't help that I can't find the format for the Qt ColorScheme option and any Qt color scheme testing app.
So I can't even fix qimgv and the Qt template (if needed).

[ItsLemmy]

It's most likely true: qimgv does not use Qt colors as it should, and they should fix it. Maybe open a bug report there.

I recommend you keep this as a user template for now, which work just fine.
Unless there is a ton of traction for that PR, I do not plan to merge this as it's a pretty small app.