SimpleNote/MainWindow.axaml.cs

using System;
using Avalonia;
using Avalonia.Controls;
using Avalonia.Input;
using Avalonia.Media;
using Avalonia.Platform;

namespace SimpleNote;

public partial class MainWindow : Window
{
    private ViewModel _viewModel;
    private PixelRect? _screen;
    public MainWindow()
    {
        if (Screens.Primary == null)
        {
            Screen max = Screens.All[0];
            for (int i = 0; i < Screens.ScreenCount; i++)
            {
                if (Screens.All[i].Bounds.Width > max.Bounds.Width) max = Screens.All[i];
            }

            _screen = max.WorkingArea;
        }
        else
            _screen = Screens.Primary?.WorkingArea;

        if (_screen == null)
        {
            Console.WriteLine("No screen available.");
            Environment.Exit(1);
        }
        
        this.Position = new PixelPoint(_screen.Value.Width / 2 - 25, 10);
        this.Width = 50;
        // this.MaxWidth = screen.Value.Width - 100;
        
        InitializeComponent();
        _viewModel = new ViewModel();
        DataContext = _viewModel;
        
        this.GetObservable(Window.WidthProperty)
            .Subscribe(width =>
            {
                if (DataContext is ViewModel vm)
                {
                    vm.WindowWidth = (double)width;
                }
            });
        
        AddButton.Focus();
    }

    public static double TextWidth(string text)
    {
        var textBlock = new TextBlock
        {
            Text = text,
            FontSize = ViewModel._fontSize,
            FontFamily = new FontFamily(FontFamily.DefaultFontFamilyName)
        };
        textBlock.Measure(Size.Infinity);
        return textBlock.DesiredSize.Width + 30 < 60 ? 60 : (textBlock.DesiredSize.Width + 30) * 1.05;
    }

    private void TextBox_OnTextChanged(object? sender, TextChangedEventArgs e)
    {
        if (sender == null) return;
        ((TextBox)sender).Width = TextWidth(((TextBox)sender).Text ?? "");
        double width = 55;
        foreach (var note in _viewModel.Notes)
        {
            width += note.Width + 49;
        }

        if ((int)width == 55) width -= 5;
        
        this.Width = width;
        if(!System.OperatingSystem.IsLinux())   // Screenpositionhandling on Hyprland/Wayland/X11 is different
            this.Position = new PixelPoint((int)((_screen.Value.Width - width) / 2), 10);
    }

    private void InputElement_OnKeyDown(object? sender, KeyEventArgs e)
    {
        if (e.Key == Key.Enter || e.Key == Key.Escape)
            AddButton.Focus();
    }
}