MvvmCross自定义事件绑定事件Args [英] MvvmCross Custom Event Binding Event Args

问题描述

我已经使用MvvmCross在EditText上为FocusChange事件创建了自定义绑定.我可以绑定事件并触发，但是我不知道如何传递事件args.我的自定义绑定是

I have created a custom binding for the FocusChange event on an EditText using MvvmCross. I can get the event bound and firing, but I can't figure out how to pass the event args. My Custom Binding is this

using Android.Views;
using Android.Widget;
using Cirrious.MvvmCross.Binding;
using Cirrious.MvvmCross.Binding.Droid.Target;
using Cirrious.MvvmCross.Binding.Droid.Views;
using Cirrious.MvvmCross.ViewModels;
using System;

namespace MPS_Mobile_Driver.Droid.Bindings
{
    public class MvxEditTextFocusChangeBinding
        : MvxAndroidTargetBinding
    {
        private readonly EditText _editText;
        private IMvxCommand _command;

        public MvxEditTextFocusChangeBinding(EditText editText) : base(editText)
        {
            _editText = editText;
            _editText.FocusChange  += editTextOnFocusChange;
        }

        private void editTextOnFocusChange(object sender, EditText.FocusChangeEventArgs eventArgs)
        {
            if (_command != null)
            {
                _command.Execute( eventArgs );
            }
        }

        public override void SetValue(object value)
        {
            _command = (IMvxCommand)value;
        }

        protected override void Dispose(bool isDisposing)
        {
            if (isDisposing)
            {
                _editText.FocusChange -= editTextOnFocusChange;
            }
            base.Dispose(isDisposing);
        }

        public override Type TargetType
        {
            get { return typeof(IMvxCommand); }
        }

        protected override void SetValueImpl(object target, object value)
        {
        }

        public override MvxBindingMode DefaultMode
        {
            get { return MvxBindingMode.OneWay; }
        }
    }
}

我将其以这种方式连接到ViewModel中:

I wire it up in my ViewModel as this:

public IMvxCommand FocusChange
{
    get
    {
        return new MvxCommand(() =>
            OnFocusChange()
            );
    }
}

private void OnFocusChange()
{
    //Do Something
}

有没有办法做

public IMvxCommand FocusChange
{
    get
    {
        return new MvxCommand((e) =>
            OnFocusChange(e)
            );
    }
}

private void OnFocusChange(EditText.FocusChangeEventArgs e)
{
    //Do Something
}

我在那里尝试执行的操作无效，但我希望有类似的方法可能有效.当命令在此行的自定义绑定中触发时，我能够传递eventargs

What I tried to do there doesn't work, but I was hoping that there was something similar that might work. I am able to pass the eventargs when the command fires in the custom binding with this line

            _command.Execute( eventArgs );

我只是找不到在ViewModel中捕获它们的方法.有人可以帮我吗?

I just can't figure a way to catch them in the ViewModel. Can anyone help me with this?

吉姆

推荐答案

尝试了许多不同的安排后，我发现连接MvxCommand的正确语法是

After trying many different arrangements, I found that the correct syntax to wire up your MvxCommand is

public IMvxCommand FocusChange
{
    get
    {
        return new MvxCommand<EditText.FocusChangeEventArgs>(e => OnFocusChange(e));
    }
}

private void OnFocusChange(EditText.FocusChangeEventArgs e)
{
    if (!e.HasFocus)
    {
         //Do Something
    }
}

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