feat: separate some Notification shared files.

src/Ursa/Controls/NotificationShared/IMessage.cs

@@ -0,0 +1,35 @@
+using Avalonia.Controls.Notifications;
+
+namespace Ursa.Controls;
+
+/// <summary>
+/// Represents a message that can be shown in a window or by the host operating system.
+/// </summary>
+public interface IMessage
+{
+    /// <summary>
+    /// Gets the <see cref="NotificationType"/> of the message.
+    /// </summary>
+    NotificationType Type { get; }
+
+    /// <summary>
+    /// Gets a value indicating whether the message should show a close button.
+    /// </summary>
+    bool ShowClose { get; }
+
+    /// <summary>
+    /// Gets the expiration time of the message after which it will automatically close.
+    /// If the value is <see cref="TimeSpan.Zero"/> then the message will remain open until the user closes it.
+    /// </summary>
+    TimeSpan Expiration { get; }
+
+    /// <summary>
+    /// Gets an Action to be run when the message is clicked.
+    /// </summary>
+    Action? OnClick { get; }
+
+    /// <summary>
+    /// Gets an Action to be run when the message is closed.
+    /// </summary>
+    Action? OnClose { get; }
+}

src/Ursa/Controls/NotificationShared/MessageCard.cs

@@ -0,0 +1,207 @@
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Controls.Metadata;
+using Avalonia.Controls.Notifications;
+using Avalonia.Interactivity;
+using Avalonia.LogicalTree;
+
+namespace Ursa.Controls;
+
+/// <summary>
+/// Control that represents and displays a message.
+/// </summary>
+[PseudoClasses(PC_Information, PC_Success, PC_Warning, PC_Error)]
+public abstract class MessageCard : ContentControl
+{
+    public const string PC_Information = ":information";
+    public const string PC_Success = ":success";
+    public const string PC_Warning = ":warning";
+    public const string PC_Error = ":error";
+
+    private bool _isClosing;
+
+    static MessageCard()
+    {
+        CloseOnClickProperty.Changed.AddClassHandler<Button>(OnCloseOnClickPropertyChanged);
+    }
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="MessageCard"/> class.
+    /// </summary>
+    public MessageCard()
+    {
+        UpdateNotificationType();
+    }
+
+    /// <summary>
+    /// Determines if the message is already closing.
+    /// </summary>
+    public bool IsClosing
+    {
+        get => _isClosing;
+        private set => SetAndRaise(IsClosingProperty, ref _isClosing, value);
+    }
+
+    /// <summary>
+    /// Defines the <see cref="IsClosing"/> property.
+    /// </summary>
+    public static readonly DirectProperty<MessageCard, bool> IsClosingProperty =
+        AvaloniaProperty.RegisterDirect<MessageCard, bool>(nameof(IsClosing), o => o.IsClosing);
+
+    /// <summary>
+    /// Determines if the message is closed.
+    /// </summary>
+    public bool IsClosed
+    {
+        get => GetValue(IsClosedProperty);
+        set => SetValue(IsClosedProperty, value);
+    }
+
+    /// <summary>
+    /// Defines the <see cref="IsClosed"/> property.
+    /// </summary>
+    public static readonly StyledProperty<bool> IsClosedProperty =
+        AvaloniaProperty.Register<MessageCard, bool>(nameof(IsClosed));
+
+    /// <summary>
+    /// Gets or sets the type of the message
+    /// </summary>
+    public NotificationType NotificationType
+    {
+        get => GetValue(NotificationTypeProperty);
+        set => SetValue(NotificationTypeProperty, value);
+    }
+
+    /// <summary>
+    /// Defines the <see cref="NotificationType" /> property
+    /// </summary>
+    public static readonly StyledProperty<NotificationType> NotificationTypeProperty =
+        AvaloniaProperty.Register<MessageCard, NotificationType>(nameof(NotificationType));
+
+    public bool ShowClose
+    {
+        get => GetValue(ShowCloseProperty);
+        set => SetValue(ShowCloseProperty, value);
+    }
+
+    public static readonly StyledProperty<bool> ShowCloseProperty =
+        AvaloniaProperty.Register<MessageCard, bool>(nameof(ShowClose), true);
+
+    /// <summary>
+    /// Defines the <see cref="MessageClosed"/> event.
+    /// </summary>
+    public static readonly RoutedEvent<RoutedEventArgs> MessageClosedEvent =
+        RoutedEvent.Register<MessageCard, RoutedEventArgs>(nameof(MessageClosed), RoutingStrategies.Bubble);
+
+
+    /// <summary>
+    /// Raised when the <see cref="MessageCard"/> has closed.
+    /// </summary>
+    public event EventHandler<RoutedEventArgs>? MessageClosed
+    {
+        add => AddHandler(MessageClosedEvent, value);
+        remove => RemoveHandler(MessageClosedEvent, value);
+    }
+
+    public static bool GetCloseOnClick(Button obj)
+    {
+        _ = obj ?? throw new ArgumentNullException(nameof(obj));
+        return obj.GetValue(CloseOnClickProperty);
+    }
+
+    public static void SetCloseOnClick(Button obj, bool value)
+    {
+        _ = obj ?? throw new ArgumentNullException(nameof(obj));
+        obj.SetValue(CloseOnClickProperty, value);
+    }
+
+    /// <summary>
+    /// Defines the CloseOnClick property.
+    /// </summary>
+    public static readonly AttachedProperty<bool> CloseOnClickProperty =
+        AvaloniaProperty.RegisterAttached<MessageCard, Button, bool>("CloseOnClick", defaultValue: false);
+
+    private static void OnCloseOnClickPropertyChanged(AvaloniaObject d, AvaloniaPropertyChangedEventArgs e)
+    {
+        var button = (Button)d;
+        var value = (bool)e.NewValue!;
+        if (value)
+        {
+            button.Click += Button_Click;
+        }
+        else
+        {
+            button.Click -= Button_Click;
+        }
+    }
+
+    /// <summary>
+    /// Called when a button inside the Message is clicked.
+    /// </summary>
+    private static void Button_Click(object? sender, RoutedEventArgs e)
+    {
+        var btn = sender as ILogical;
+        var message = btn?.GetLogicalAncestors().OfType<MessageCard>().FirstOrDefault();
+        message?.Close();
+    }
+
+    /// <summary>
+    /// Closes the <see cref="MessageCard"/>.
+    /// </summary>
+    public void Close()
+    {
+        if (IsClosing)
+        {
+            return;
+        }
+
+        IsClosing = true;
+    }
+
+    protected override void OnPropertyChanged(AvaloniaPropertyChangedEventArgs e)
+    {
+        base.OnPropertyChanged(e);
+
+        if (e.Property == ContentProperty && e.NewValue is IMessage message)
+        {
+            SetValue(NotificationTypeProperty, message.Type);
+        }
+
+        if (e.Property == NotificationTypeProperty)
+        {
+            UpdateNotificationType();
+        }
+
+        if (e.Property == IsClosedProperty)
+        {
+            if (!IsClosing && !IsClosed)
+            {
+                return;
+            }
+
+            RaiseEvent(new RoutedEventArgs(MessageClosedEvent));
+        }
+    }
+
+    private void UpdateNotificationType()
+    {
+        switch (NotificationType)
+        {
+            case NotificationType.Error:
+                PseudoClasses.Add(PC_Error);
+                break;
+
+            case NotificationType.Information:
+                PseudoClasses.Add(PC_Information);
+                break;
+
+            case NotificationType.Success:
+                PseudoClasses.Add(PC_Success);
+                break;
+
+            case NotificationType.Warning:
+                PseudoClasses.Add(PC_Warning);
+                break;
+        }
+    }
+}

src/Ursa/Controls/NotificationShared/WindowMessageManager.cs

@@ -0,0 +1,80 @@
+using System.Collections;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Controls.Metadata;
+using Avalonia.Controls.Primitives;
+using Avalonia.Layout;
+using Avalonia.VisualTree;
+
+namespace Ursa.Controls;
+
+/// <summary>
+/// An <see cref="WindowMessageManager"/> that displays messages in a <see cref="Window"/>.
+/// </summary>
+[TemplatePart(PART_Items, typeof(Panel))]
+public abstract class WindowMessageManager : TemplatedControl
+{
+    public const string PART_Items = "PART_Items";
+
+    protected IList? _items;
+
+    /// <summary>
+    /// Defines the <see cref="MaxItems"/> property.
+    /// </summary>
+    public static readonly StyledProperty<int> MaxItemsProperty =
+        AvaloniaProperty.Register<WindowMessageManager, int>(nameof(MaxItems), 5);
+
+    /// <summary>
+    /// Defines the maximum number of messages visible at once.
+    /// </summary>
+    public int MaxItems
+    {
+        get => GetValue(MaxItemsProperty);
+        set => SetValue(MaxItemsProperty, value);
+    }
+
+    static WindowMessageManager()
+    {
+        HorizontalAlignmentProperty.OverrideDefaultValue<WindowMessageManager>(HorizontalAlignment.Stretch);
+        VerticalAlignmentProperty.OverrideDefaultValue<WindowMessageManager>(VerticalAlignment.Stretch);
+    }
+
+    /// <inheritdoc/>
+    protected override void OnApplyTemplate(TemplateAppliedEventArgs e)
+    {
+        base.OnApplyTemplate(e);
+
+        var itemsControl = e.NameScope.Find<Panel>(PART_Items);
+        _items = itemsControl?.Children;
+    }
+
+    public abstract void Show(object content);
+
+    /// <summary>
+    /// Installs the <see cref="WindowMessageManager"/> within the <see cref="AdornerLayer"/>
+    /// </summary>
+    protected void InstallFromTopLevel(TopLevel topLevel)
+    {
+        topLevel.TemplateApplied += TopLevelOnTemplateApplied;
+        var adorner = topLevel.FindDescendantOfType<VisualLayerManager>()?.AdornerLayer;
+        if (adorner is not null)
+        {
+            adorner.Children.Add(this);
+            AdornerLayer.SetAdornedElement(this, adorner);
+        }
+    }
+
+    protected void TopLevelOnTemplateApplied(object? sender, TemplateAppliedEventArgs e)
+    {
+        if (Parent is AdornerLayer adornerLayer)
+        {
+            adornerLayer.Children.Remove(this);
+            AdornerLayer.SetAdornedElement(this, null);
+        }
+
+        // Reinstall message manager on template reapplied.
+        var topLevel = (TopLevel)sender!;
+        topLevel.TemplateApplied -= TopLevelOnTemplateApplied;
+        InstallFromTopLevel(topLevel);
+    }
+}