[Feature] Need a new IsTitleBarVisibleStateTrigger

[ProJend]

Describe the problem this feature would solve

I try to run the FullScreenModeStateTrigger but it ain't catch the Tablet Mode settings that have been changed. so I just running code in class rather than XAML at this time.

Describe the solution

it can make me do something in XAML when IsVisibleChanged of Window's TitleBar has been changed.

Describe alternatives you've considered

just look like the FullScreenModeStateTrigger function.

Additional context & Screenshots

xmlns:triggers="using:Microsoft.Toolkit.Uwp.UI.Triggers" />
...
<VisualState.StateTriggers>
    <triggers:IsTitleBarVisibleStateTrigger IsVisible="true" />
</VisualState.StateTriggers>

[ghost]

Hello, 'ProJend! Thanks for submitting a new feature request. I've automatically added a vote 👍 reaction to help get things started. Other community members can vote to help us prioritize this feature in the future!

[Kyaa-dost]

@ProJend Thanks for the feature request! Going to open this up for discussion with the community.

[michael-hawker]

@dotMorten isn't this what the UserInteractionModeTrigger is for? @ProJend did you try that one and it just didn't work, or did you just not find it?

[dotMorten]

Yup. Full screen and tablet mode are two different things. You can be full screen both in or outside tablet mode, and tablet mode doesn't mean things will be full-screen either.

[ProJend]

@dotMorten isn't this what the UserInteractionModeTrigger is for? @ProJend did you try that one and it just didn't work, or did you just not find it?

No, it isn't what I looking for.

[ProJend]

Yup. Full screen and tablet mode are two different things. You can be full screen both in or outside tablet mode, and tablet mode doesn't mean things will be full-screen either.

Well, full screen or tablet mode both can switch show state on titlebar.

[michael-hawker]

Thanks for the clarification @ProJend.

I believe this is the API we'd have to hook into for a new State Trigger:

    var coreTitleBar = CoreApplication.GetCurrentView().TitleBar;

    // Register a handler for when the title bar visibility changes.
    // For example, when the title bar is invoked in full screen mode.
    coreTitleBar.IsVisibleChanged += CoreTitleBar_IsVisibleChanged;
}

private void CoreTitleBar_IsVisibleChanged(CoreApplicationViewTitleBar sender, object args)
{
    // sender.IsVisible
}

@marb2000 @azchohfi will this also work for WinUI 3 in the future?

[azchohfi]

AFAIK, if in UWP, yes.
In Win32 there is no CoreWindow so you will probably be using AppWindow. I know that there will be a new API specifically for that, but I don't know details.