92 lines
3.2 KiB
C#
92 lines
3.2 KiB
C#
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using Microsoft.UI.Xaml;
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using Microsoft.Xaml.Interactivity;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Reflection;
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using System.Text;
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using System.Threading.Tasks;
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using System.Windows.Input;
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namespace VDownload.GUI.Customs.Behaviors
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{
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public class EventToCommandBehavior : Behavior<FrameworkElement>
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{
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#region FIELDS
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private Delegate _handler;
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private EventInfo _oldEvent;
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#endregion
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#region PROPERTIES
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public string Event { get { return (string)GetValue(EventProperty); } set { SetValue(EventProperty, value); } }
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public static readonly DependencyProperty EventProperty = DependencyProperty.Register("Event", typeof(string), typeof(EventToCommandBehavior), new PropertyMetadata(null, OnEventChanged));
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public ICommand Command { get { return (ICommand)GetValue(CommandProperty); } set { SetValue(CommandProperty, value); } }
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public static readonly DependencyProperty CommandProperty = DependencyProperty.Register("Command", typeof(ICommand), typeof(EventToCommandBehavior), new PropertyMetadata(null));
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public bool PassArguments { get { return (bool)GetValue(PassArgumentsProperty); } set { SetValue(PassArgumentsProperty, value); } }
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public static readonly DependencyProperty PassArgumentsProperty = DependencyProperty.Register("PassArguments", typeof(bool), typeof(EventToCommandBehavior), new PropertyMetadata(false));
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#endregion
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#region PRIVATE METHODS
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private static void OnEventChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
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{
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EventToCommandBehavior beh = (EventToCommandBehavior)d;
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if (beh.AssociatedObject != null)
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{
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beh.AttachHandler((string)e.NewValue);
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}
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}
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protected override void OnAttached()
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{
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AttachHandler(this.Event);
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}
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private void AttachHandler(string eventName)
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{
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if (_oldEvent != null)
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{
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_oldEvent.RemoveEventHandler(this.AssociatedObject, _handler);
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}
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if (!string.IsNullOrEmpty(eventName))
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{
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EventInfo ei = this.AssociatedObject.GetType().GetEvent(eventName);
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if (ei != null)
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{
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MethodInfo mi = this.GetType().GetMethod("ExecuteCommand", BindingFlags.Instance | BindingFlags.NonPublic);
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_handler = Delegate.CreateDelegate(ei.EventHandlerType, this, mi);
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ei.AddEventHandler(this.AssociatedObject, _handler);
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_oldEvent = ei;
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}
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else
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{
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throw new ArgumentException(string.Format("The event '{0}' was not found on type '{1}'", eventName, this.AssociatedObject.GetType().Name));
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}
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}
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}
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private void ExecuteCommand(object sender, object e)
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{
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object parameter = this.PassArguments ? e : null;
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if (this.Command != null && this.Command.CanExecute(parameter))
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{
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this.Command.Execute(parameter);
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}
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}
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#endregion
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}
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}
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