Support template images on MacOS for menubar icons. about fyne HOT 4 CLOSED

Exposing a call particularly useful for macOS kinda goes against platform-agnostic design. Passing in a ThemedResource allows us to do the right thing per-platform under the hood.

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There's a lot of interesting thoughts here, but I don't follow how having a version of an icon called "_templated" helps to use template icons in systray?
More simply we could either add SetTemplateSystrayIcon or just make use of the existing ThemedResource to be used as a template image in the systray context?
i.e. SetSystemTrayIcon(theme.NewThemedResource(iconData))?
seems much simpler and uses existing APIs.

from fyne.

Simply exposing SetTemplateSystrayIcon is probably a good start, though given the general guidance to prefer templated images on macOS, it's probably worth considering how it might be handled in a default way. I like the idea of using ThemedResource for that, since, as you say, it already exists. It wasn't clear on how themed resources worked when I first submitted the issue, but after digging around in the code, it looks as if they require an SVG and then just swap out the fill color? If that's the case, SetSystemTrayIcon could then just conditionally rasterize themed resources to black on macOS, which would solve the issue neatly!

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Fixed on the develop branch as proposed (passing theme.ThemedResource) will be available in v2.5.0

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