54 lines
1.3 KiB
C#
54 lines
1.3 KiB
C#
using Avalonia;
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using Avalonia.Controls;
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namespace InkForge.Desktop.Services;
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public class TopLevels
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{
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public static readonly AttachedProperty<object?> RegisterProperty
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= AvaloniaProperty.RegisterAttached<TopLevels, Visual, object?>("Register");
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private static readonly Dictionary<object, Visual> RegistrationMapper = [];
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static TopLevels()
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{
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RegisterProperty.Changed.AddClassHandler<Visual>(RegisterChanged);
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}
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public static object? GetRegister(AvaloniaObject element)
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{
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return element.GetValue(RegisterProperty);
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}
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public static TopLevel? GetTopLevelForContext(object context)
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{
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return TopLevel.GetTopLevel(GetVisualForContext(context));
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}
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public static Visual? GetVisualForContext(object context)
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{
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return RegistrationMapper.TryGetValue(context, out var result) ? result : null;
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}
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public static void SetRegister(AvaloniaObject element, object value)
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{
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element.SetValue(RegisterProperty, value);
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}
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private static void RegisterChanged(Visual sender, AvaloniaPropertyChangedEventArgs e)
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{
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ArgumentNullException.ThrowIfNull(sender);
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// Unregister any old registered context
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if (e.OldValue != null)
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{
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RegistrationMapper.Remove(e.OldValue);
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}
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// Register any new context
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if (e.NewValue != null)
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{
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RegistrationMapper.Add(e.NewValue, sender);
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}
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}
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}
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