60 lines
2.1 KiB
C#
60 lines
2.1 KiB
C#
using System.Reflection;
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using System.Windows.Input;
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namespace GreadyPoang.Common;
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public class EventToCommandBehavior : BehaviorBase<VisualElement>
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{
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public required string EventName { get; set; }
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public static readonly BindableProperty CommandProperty =
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BindableProperty.Create(nameof(Command), typeof(ICommand), typeof(EventToCommandBehavior));
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public ICommand Command
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{
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get => (ICommand)GetValue(CommandProperty);
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set => SetValue(CommandProperty, value);
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}
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// Fix for CS8618: Make the field nullable and fix IDE1006: Add '_' prefix
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private EventInfo? _eventInfo;
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private Delegate? _eventHandler;
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protected override void OnAttachedTo(VisualElement bindable)
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{
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base.OnAttachedTo(bindable);
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if (bindable == null || string.IsNullOrEmpty(EventName))
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return;
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var runtimeEvent = bindable.GetType().GetRuntimeEvent(EventName);
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if (runtimeEvent == null)
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throw new ArgumentException($"Event '{EventName}' not found on type '{bindable.GetType().Name}'");
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_eventInfo = runtimeEvent;
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MethodInfo? methodInfo = typeof(EventToCommandBehavior).GetTypeInfo().GetDeclaredMethod(nameof(OnEvent));
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if (methodInfo == null)
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throw new InvalidOperationException($"Method '{nameof(OnEvent)}' not found on type '{typeof(EventToCommandBehavior).Name}'");
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if (_eventInfo.EventHandlerType == null)
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throw new InvalidOperationException($"EventHandlerType for event '{EventName}' is null on type '{bindable.GetType().Name}'");
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_eventHandler = methodInfo.CreateDelegate(_eventInfo.EventHandlerType, this);
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_eventInfo.AddEventHandler(bindable, _eventHandler);
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}
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protected override void OnDetachingFrom(VisualElement bindable)
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{
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base.OnDetachingFrom(bindable);
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if (_eventInfo != null && _eventHandler != null)
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_eventInfo.RemoveEventHandler(bindable, _eventHandler);
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}
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private void OnEvent(object sender, object eventArgs)
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{
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if (Command?.CanExecute(eventArgs) == true)
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Command.Execute(eventArgs);
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}
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}
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