mvvmcross MvxBind on actionSend (imeOption action)

Question

i have an editText like this:

    <EditText
        local:MvxBind="Text MyProperty; Click MyCommand"
        android:inputType="textShortMessage"
        android:imeOptions="actionSend" />

I want the command to be triggered by the "enter/action" key on the keyboard. What verb should i use in the binding ? The "Change" verb i currently use triggers on any touch in the control !(

Answer 1

If you want to implement a "custom binding", then there are 3 types of way to do it:

1. Implement and register a true custom binding
2. Implement a custom control which exposes a custom property to bind to
3. Use an intermediate object which exposes a custom property

---

The answer in https://stackoverflow.com/a/19221385/373321 shows a true custom binding.

---

Custom controls which inherit from standard views is discussed in N=18 in http://mvvmcross.blogspot.com - an example here might be:

public class DoneEditText : EditText, TextView.IOnEditorActionListener
{
    public DoneEditText(Context context) : base(context)
    {
        Init();
    }

    public DoneEditText(Context context, IAttributeSet attrs) : base(context, attrs)
    {
        Init();
    }

    public DoneEditText(Context context, IAttributeSet attrs, int defStyle) : base(context, attrs, defStyle)
    {
        Init();
    }

    private void Init()
    {
          this.SetOnEditorActionListener(this);
    }

    public ICommand DoneAction { get;set; ]

    #region Implementation of IOnEditorActionListener

    public bool OnEditorAction(TextView v, ImeAction actionId, KeyEvent e)
    {
        if (actionId == ImeAction.Done)
        {
            if (DoneAction != null)
                    DoneAction.Execute(v.Text);
            return true;
        }

        return false;
    }

    #endregion
}    

---

Using an intermediate object for the binding would use a class like:

public class DoneActionListener : Java.Lang.Object, TextView.IOnEditorActionListener
{
    public ICommand DoneAction { get; set; }

    public DoneActionListener(TextView v)
    {
          v.SetOnEditorActionListener(this);
   }

    #region Implementation of IOnEditorActionListener

    public bool OnEditorAction(TextView v, ImeAction actionId, KeyEvent e)
    {
        if (actionId == ImeAction.Done)
        {
            if (DoneAction != null)
                    DoneAction.Execute(v.Text);
            return true;
        }

        return false;
    }

    #endregion
}

this could be handled in OnCreate using Fluent Binding like:

private DoneActionListener _listener;

public override OnCreate(Bundle b)
{
    base.OnCreate(b);
    SetContentView(Resource.Layout.MyLayoutId);

    _listener = new DoneActionListener(FindViewById<EditText>(Resource.Id.MyEditId));

    var set = this.CreateBindingSet<MyView, MyViewModel>();
    set.Bind(_listener).For(v => v.DoneAction).To(vm => vm.TheDoneCommand);
    set.Apply();
}