51 lines
1.6 KiB
C#
51 lines
1.6 KiB
C#
using System.Reflection;
|
|
using System.Windows.Input;
|
|
|
|
namespace GreadyPoang.Common;
|
|
public class EventToCommandBehavior : BehaviorBase<VisualElement>
|
|
{
|
|
public string EventName { get; set; }
|
|
|
|
public static readonly BindableProperty CommandProperty =
|
|
BindableProperty.Create(nameof(Command), typeof(ICommand), typeof(EventToCommandBehavior));
|
|
|
|
public ICommand Command
|
|
{
|
|
get => (ICommand)GetValue(CommandProperty);
|
|
set => SetValue(CommandProperty, value);
|
|
}
|
|
|
|
private EventInfo eventInfo;
|
|
private Delegate eventHandler;
|
|
|
|
protected override void OnAttachedTo(VisualElement bindable)
|
|
{
|
|
base.OnAttachedTo(bindable);
|
|
|
|
if (bindable == null || string.IsNullOrEmpty(EventName))
|
|
return;
|
|
|
|
eventInfo = bindable.GetType().GetRuntimeEvent(EventName);
|
|
if (eventInfo == null)
|
|
throw new ArgumentException($"Event '{EventName}' not found on type '{bindable.GetType().Name}'");
|
|
|
|
MethodInfo methodInfo = typeof(EventToCommandBehavior).GetTypeInfo().GetDeclaredMethod(nameof(OnEvent));
|
|
eventHandler = methodInfo.CreateDelegate(eventInfo.EventHandlerType, this);
|
|
eventInfo.AddEventHandler(bindable, eventHandler);
|
|
}
|
|
|
|
protected override void OnDetachingFrom(VisualElement bindable)
|
|
{
|
|
base.OnDetachingFrom(bindable);
|
|
|
|
if (eventInfo != null && eventHandler != null)
|
|
eventInfo.RemoveEventHandler(bindable, eventHandler);
|
|
}
|
|
|
|
private void OnEvent(object sender, object eventArgs)
|
|
{
|
|
if (Command?.CanExecute(eventArgs) == true)
|
|
Command.Execute(eventArgs);
|
|
}
|
|
}
|