C# WINDOWS MAUI專案 全螢幕(maximize application) & 移除/隱藏標題列(Remove/Hide the Title Bar )

資料來源: https://stackoverflow.com/questions/72128525/net-maui-how-to-maximize-application-on-startup

https://github.com/dotnet/maui/issues/15142
https://learn.microsoft.com/en-us/dotnet/maui/fundamentals/windows

GITHUB: https://github.com/jash-git/MAUI_WinAPI_Object_test/tree/main/Code/01

Code ~ [MauiProgram.cs]

//---
//.net MAUI how to maximize application on startup
//https://stackoverflow.com/questions/72128525/net-maui-how-to-maximize-application-on-startup
using Microsoft.Maui.LifecycleEvents;

#if WINDOWS
using Microsoft.UI;
using Microsoft.UI.Windowing;
using Windows.Graphics;
#endif
//---.net MAUI how to maximize application on startup
namespace MAUI_WinAPI_Object_test;

public static class MauiProgram
{
	public static MauiApp CreateMauiApp()
	{
		var builder = MauiApp.CreateBuilder();
		builder
			.UseMauiApp<App>()
			.ConfigureFonts(fonts =>
			{
				fonts.AddFont("OpenSans-Regular.ttf", "OpenSansRegular");
				fonts.AddFont("OpenSans-Semibold.ttf", "OpenSansSemibold");
			});
        //---
        //.net MAUI how to maximize application on startup
        https://stackoverflow.com/questions/72128525/net-maui-how-to-maximize-application-on-startup
#if WINDOWS
        builder.ConfigureLifecycleEvents(events =>
        {
            events.AddWindows(wndLifeCycleBuilder =>
            {
                wndLifeCycleBuilder.OnWindowCreated(window =>
                {
                    IntPtr nativeWindowHandle = WinRT.Interop.WindowNative.GetWindowHandle(window);
                    WindowId win32WindowsId = Win32Interop.GetWindowIdFromWindow(nativeWindowHandle);
                    AppWindow winuiAppWindow = AppWindow.GetFromWindowId(win32WindowsId);
                    if(winuiAppWindow.Presenter is OverlappedPresenter p)
                    {
                        p.Maximize();
                    }

                    //---
                    //[Windows] How to completely hide the TitleBar? 
                    //https://github.com/dotnet/maui/issues/15142
                    window.ExtendsContentIntoTitleBar = false;
                    switch (winuiAppWindow.Presenter)
                    {
                        case Microsoft.UI.Windowing.OverlappedPresenter overlappedPresenter:
                            overlappedPresenter.SetBorderAndTitleBar(false, false);
                            overlappedPresenter.Maximize();
                            break;
                    }
                    //---[Windows] How to completely hide the TitleBar? 

                });
            });
        });
#endif
        //---.net MAUI how to maximize application on startup
        return builder.Build();
	}
}

Code ~ [MainPage.xaml.cs]

//using Android.App;
using Microsoft.Maui.Controls;

namespace MAUI_WinAPI_Object_test;
public partial class MainPage : ContentPage
{
	int count = 0;

	public MainPage()
	{
		InitializeComponent();
	}

	private void OnCounterClicked(object sender, EventArgs e)
	{
		count++;

		if (count == 1)
			CounterBtn.Text = $"Clicked {count} time";
		else
			CounterBtn.Text = $"Clicked {count} times";
	}
    private void OnClosed(object sender, EventArgs e)
    {
        // Close the active window
        //https://learn.microsoft.com/en-us/dotnet/maui/fundamentals/windows
        Application.Current.CloseWindow(GetParentWindow());
    }
}