Reduce initial window size of WinUI 3 app?

[StevenABrown]

In Visual Studio 2022, I created a project using the WinUI 3 blank project template. The window that appears upon launch of the application takes up about half the screen, and I would like to reduce the size, because I intend to build a small application with few controls. Nowhere in the source files could I find code that specifies the size of the window. How can I do that?

[castorix]

You can use this.AppWindow.MoveAndResize (or just Resize)

[gautambjain]

How would I do for any Window object and not just the main window (AppWindow)? ::SetWindowPos is the only solution?

[gautambjain]

Sorry didn't read the this. you had mentioned. Now I know.

[mareksm]

This should do:

winrt::Microsoft::UI::WindowId windowId = winrt::Microsoft::UI::GetWindowIdFromWindow(hWnd);
winrt::Microsoft::UI::Windowing::AppWindow appWindow = winrt::Microsoft::UI::Windowing::AppWindow::GetFromWindowId(windowId);

appWindow.Resize(Windows::Graphics::SizeInt32{800, 600});

[AlexanderBlackman]

@mareksm Where would you put this code?

[mareksm]

In a class that implements WindowT, constructor.

[Balkoth]

Be careful when setting the size on a display that is scaled other than 100%, because you do need to adjust the values accordingly or your window may be too small or too large.