Accessing controls inside a ContentControl (RE: title bar customisation)

[beeradmoore]

I am wanting to create a custom title bar and even though the new docs go into a lot of detail, specifically Color and transparency in caption buttons, but there are a few problems with it still, specifically with changing themes. I will go repro and report those bugs separately another time, but at the moment I have title bar exhaustion and I just want my app updated and published ASAP

I was able to overcome this in my test app by using a FakeMinMaxCloseButtons class. The idea being if Win11 (eg. IsCustomizationSupported) we use defaults, if anything else we do a full replace of the titlebar, window caption buttons included.

For the fake window caption buttons I grab the grid from within ~\.nuget\packages\microsoft.windowsappsdk\1.0.0\lib\net5.0-windows10.0.17763.0\Microsoft.WinUI\Themes\generic.xaml which is based inside the WindowChromeStyle style. I then use Win32 API to wire up the buttons.

This whole view can almost be replaced with a single line of

<ContentControl x:Name="MainContentControl" Style="{StaticResource WindowChromeStyle}" />

however, by doing this I can't wire up the click events inside this ContentControl. Everything used inside WindowChromeStyle is pretty much copied (although disabled) here.

As you can see inside it there is 3 buttons MinimizeButton, MaximizeButton and CloseButton. I had some failed attempts of trying to reference buttons and styles but nothing seemed to work.

Ideally I'd like to reference the style inside WindowsAppSDK rather than copy it (which is what the current implementation is) so if there is any updates in the future I will have those updates.

So the TL;DR; question is, given the ContentControl above which has a style applied to it of WindowChromeStyle, how do you reference the buttons that get defined inside it? Is that possible? Is it possible in a future update to add commands or something else to these buttons so they could be accessed externally?

[BenJKuhn]

I've moved this over to the WinUI repo, someone should be able to help answer your question over there:

microsoft/microsoft-ui-xaml#6738

[beeradmoore]

Ah cheers. I posted it here because this was the WinUI3 repo at one point and that's where UI title bar discussions were. I'll subscribe to the new topic and keep investigating here.