Add caption button dim out for unfocused windows

[Aliremu]

Summary of the Pull Request

This PR closes #12632 by dimming the caption controls in the titlebar when unfocused. Leaves them intact when in high contrast mode. The color used is borrowed from PowerToy's unfocused color: https://github.com/microsoft/PowerToys/blob/37bd24db365d7bfc3e27fc77d0ac3c0948ffa189/src/settings-ui/Settings.UI/SettingsXAML/Controls/TitleBar/TitleBar.xaml#L179

References and Relevant Issues

#12632
#10401

Detailed Description of the Pull Request / Additional comments

Introduces a _focused boolean to TitlebarControl which is passed into MinMaxCloseControl. Instead of using a new VisualStateGroup, I opted to slot the Unfocused state into CommonStates, this way we prevent any conflicts with Visual Setters, and can preserve animations.

Validation Steps Performed

Tested by hovering and unhovering in focused and unfocused states, as well as in high contrast mode. States are consistent and applied correctly. I did notice that clicking on the titlebar wouldn't put it into focus unless I also moved my mouse though, but that is also present in the release branch.

PR Checklist

• Closes Make sure caption controls "dim out" when window loses NC focus (WM_NCACTIVATE?) #12632
• Tests added/passed
• Documentation updated
  • If checked, please file a pull request on our docs repo and link it here: #xxx
• Schema updated (if necessary)

[Aliremu]

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[carlos-zamora]

From a quick glance, I'm personally not a fan of adding a _focused member to MinMaxCloseControl and TitlebarControl. The concern being that at some point these two may go out of sync (not necessarily in this PR, but in the future).

Since TitlebarControl doesn't really use _focused other than passing it down to MinMaxCloseControl, how about this:

• remove _focused from TitlebarControl
• when _titlebar.Focused() is called, instead set it on the MinMaxCloseControl (either replace the code directly or have TitlebarControl::Focused() just set it on the MinMaxCloseControl then)
• then, you won't need to pass _focused each time you interact with the control. MinMaxCloseControl should then be keeping track of the state directly and make changes appropriately

That should end up reducing the complexity by a bit, and you'll actually use the MinMaxCloseControl::_focused member you added 😉.

Aside from that, I tested the changes locally and it looks/feels great! Thanks for doing this, I'm excited to see it land soon. 😊

[Aliremu]

From a quick glance, I'm personally not a fan of adding a _focused member to MinMaxCloseControl and TitlebarControl. The concern being that at some point these two may go out of sync (not necessarily in this PR, but in the future).

Since TitlebarControl doesn't really use _focused other than passing it down to MinMaxCloseControl, how about this:

• remove _focused from TitlebarControl
• when _titlebar.Focused() is called, instead set it on the MinMaxCloseControl (either replace the code directly or have TitlebarControl::Focused() just set it on the MinMaxCloseControl then)
• then, you won't need to pass _focused each time you interact with the control. MinMaxCloseControl should then be keeping track of the state directly and make changes appropriately

That should end up reducing the complexity by a bit, and you'll actually use the MinMaxCloseControl::_focused member you added 😉.

Aside from that, I tested the changes locally and it looks/feels great! Thanks for doing this, I'm excited to see it land soon. 😊

Thanks! I've removed _focused from TitlebarControl and consolidated it into MinMaxCloseControl as its source of truth.