CODEWITHSUNDEEP
windowc++-winrtwinui-3visual-treedependencyobject
ridilculous
ridilculous

Reputation: 792

How to get the Window hosting a UIElement instance

I'm trying to get the Window instance which is hosting a UIElement instance in WinUI 3.

There's a helper method in the Window class in .NET (see this thread) but i cannot find something similar for C++/WinRT.

I tried VisualTreeHelper as some suggested but it doesn't help here; none of the parents were of type winrt::Microsoft::UI::Xaml::Window.

Is it possible to get the hosting Window of a dependency object?

Upvotes: 3

Views: 890

Answers (2)

ACGMN
ACGMN

Reputation: 19

This problem has long puzzled me. And I find this API available since winrt-18362. Unfortunately, the AppWindow needed here is under namespace Windows.UI.Xaml.Hosting rather than Microsoft.UI.Windowing. The later one is easy to get from a HWND. BTW, I've also tried to store the Window instance somewhere but always failed with some error related to its constructor. Then, I finally achieved it by storing it as a static const reference and reassigning the variable through its pointer.

I just find an alternative method to manage Window instances here. This would help us get window from any known custom implementation type. But there would be link error with no initialization or compile error due to no 'inline'.

Upvotes: 0

Roy Li - MSFT
Roy Li - MSFT

Reputation: 8666

If it is a UWP application, each UI thread already has a Window that can be retrieved using the static Window.Current property.

If it is a C++/WinRT WinUI3 in Desktop application, Window implements IWindowNative to enable interop through the Window's HWND (WindowHandle). You could get the handle of the Window and do what you want. Like:

 // Get the current window's HWND by passing in the Window object
     var hwnd = WinRT.Interop.WindowNative.GetWindowHandle(this);

For more information, please check: Window Class-Windows App SDK

Upvotes: 1

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