Semi.Avalonia/demo/Semi.Avalonia.Demo/Pages/ContentPageDemo.axaml.cs

using Avalonia.Controls;
using Avalonia.Interactivity;
using Avalonia.Media;
using Avalonia.Layout;

namespace Semi.Avalonia.Demo.Pages;

public partial class ContentPageDemo : UserControl
{
    private static readonly Color[] PageColors =
    [
        Color.FromRgb(0xE3, 0xF2, 0xFD), // blue
        Color.FromRgb(0xF3, 0xE5, 0xF5), // purple
        Color.FromRgb(0xE8, 0xF5, 0xE9), // green
        Color.FromRgb(0xFF, 0xF8, 0xE1), // amber
        Color.FromRgb(0xFB, 0xE9, 0xE7), // deep orange
    ];

    private int _pageCount;

    public ContentPageDemo()
    {
        InitializeComponent();
        Loaded += OnLoaded;
    }

    private async void OnLoaded(object? sender, RoutedEventArgs e)
    {
        await DemoNav.PushAsync(MakePage("Root Page", "ContentPage inside a NavigationPage.\nUse the options to navigate."));
        UpdateStatus();
    }

    private async void OnPush(object? sender, RoutedEventArgs e)
    {
        _pageCount++;
        await DemoNav.PushAsync(MakePage($"Page {_pageCount}", $"ContentPage #{_pageCount}.\nNavigate back using the back button."));
        UpdateStatus();
    }

    private async void OnPop(object? sender, RoutedEventArgs e)
    {
        await DemoNav.PopAsync();
        UpdateStatus();
    }

    private async void OnPopToRoot(object? sender, RoutedEventArgs e)
    {
        await DemoNav.PopToRootAsync();
        _pageCount = 0;
        UpdateStatus();
    }

    private void UpdateStatus()
    {
        StatusText.Text = $"Depth: {DemoNav.StackDepth} | Current: {DemoNav.CurrentPage?.Header}";
    }

    private ContentPage MakePage(string header, string body) =>
        new ContentPage
        {
            Header = header,
            Background = new SolidColorBrush(PageColors[_pageCount % PageColors.Length]),
            Content = new StackPanel
            {
                HorizontalAlignment = HorizontalAlignment.Center,
                VerticalAlignment = VerticalAlignment.Center,
                Spacing = 10,
                Children =
                {
                    new TextBlock
                    {
                        Text = header,
                        FontSize = 20,
                        FontWeight = FontWeight.SemiBold,
                        HorizontalAlignment = HorizontalAlignment.Center,
                        Foreground = Brushes.Black,
                    },
                    new TextBlock
                    {
                        Text = body,
                        FontSize = 13,
                        Opacity = 0.7,
                        TextWrapping = TextWrapping.Wrap,
                        TextAlignment = TextAlignment.Center,
                        MaxWidth = 260,
                        Foreground = Brushes.Black,
                    }
                }
            },
            HorizontalContentAlignment = HorizontalAlignment.Stretch,
            VerticalContentAlignment = VerticalAlignment.Stretch
        };
}