add support for dark mode on macOS

[mixxxbot]

Reported by: foss-4
Date: 2020-07-12T11:38:43Z
Status: Fix Committed
Importance: Low
Launchpad Issue: lp1887280
Attachments: [mixxx dark mode macOS.png](https://bugs.launchpad.net/bugs/1887280/+attachment/5434846/+files/mixxx dark mode macOS.png)

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Currently window title bar and settings are in light mode only.

Would be great if Mixxx adapted the macOS system setting to follow user preferences for dark / light mode and when users are using dark mode support showing the window title bar and preferences in dark mode.

[mixxxbot]

Commented by: Be-ing
Date: 2020-07-12T11:52:06Z

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I think we have to update the macOS SDK used in the build environment:
https://doc.qt.io/qt-5/macos.html#opting-out-of-macos-behavior-changes

So this is blocked on #1974

[mixxxbot]

Commented by: ronso0
Date: 2020-07-13T13:10:04Z

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we may simply load a dark palette for the main menubar since -right now- all our skins are rather dark.
See my latest comments in https://mixxx.zulipchat.com/#narrow/stream/109171-development/topic/Getting.20rid.20of.20the.20menu.20bar/near/202829332

[mixxxbot]

Commented by: foss-4
Date: 2020-11-16T19:24:34Z

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Closing this, dark mode is now supported thanks to the outstanding work @be put into the macOS build process. Thanks so much - it is highly appreciated.

[mixxxbot]

Commented by: foss-4
Date: 2020-11-16T19:25:05Z
Attachments: [mixxx dark mode macOS.png](https://bugs.launchpad.net/mixxx/+bug/1887280/+attachment/5434846/+files/mixxx dark mode macOS.png)

[mixxxbot]

Commented by: ronso0
Date: 2020-11-16T20:53:46Z

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Nice.
Only the tree icons are kinda useless, except the Colors (brush) icon.
Maybe we should remove the gradients and make them all monochrome? That would only affect themes with a pure black background, with any other OS theme it would be fine IMO.

[mixxxbot]

Commented by: foss-4
Date: 2021-03-26T17:24:48Z

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re-opening. due to issues which were introduced using newer versions of xcode this got reverted and is thus unfixed again.

[mixxxbot]

Commented by: foss-4
Date: 2021-09-20T08:04:15Z

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And back to fix committed since #4225 was merged. Preferences and title bar are also respecting dark mode now.

[mixxxbot]

Issue closed with status Fix Committed.