|
|
@ -0,0 +1,38 @@
|
|
|
|
|
|
|
|
using System;
|
|
|
|
|
|
|
|
using System.Collections.Generic;
|
|
|
|
|
|
|
|
using System.Linq;
|
|
|
|
|
|
|
|
using System.Text;
|
|
|
|
|
|
|
|
using System.Threading.Tasks;
|
|
|
|
|
|
|
|
using Xamarin.Forms;
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
namespace BookAStar.Behaviors
|
|
|
|
|
|
|
|
{
|
|
|
|
|
|
|
|
public class MaxLengthValidator : Behavior<Entry>
|
|
|
|
|
|
|
|
{
|
|
|
|
|
|
|
|
public static readonly BindableProperty MaxLengthProperty = BindableProperty.Create("MaxLength", typeof(int), typeof(MaxLengthValidator), 0);
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
public int MaxLength
|
|
|
|
|
|
|
|
{
|
|
|
|
|
|
|
|
get { return (int)GetValue(MaxLengthProperty); }
|
|
|
|
|
|
|
|
set { SetValue(MaxLengthProperty, value); }
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
protected override void OnAttachedTo(Entry bindable)
|
|
|
|
|
|
|
|
{
|
|
|
|
|
|
|
|
bindable.TextChanged += bindable_TextChanged;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
private void bindable_TextChanged(object sender, TextChangedEventArgs e)
|
|
|
|
|
|
|
|
{
|
|
|
|
|
|
|
|
//if (MaxLength != null && MaxLength.HasValue)
|
|
|
|
|
|
|
|
if (e.NewTextValue.Length > 0 && e.NewTextValue.Length > MaxLength)
|
|
|
|
|
|
|
|
((Entry)sender).Text = e.NewTextValue.Substring(0, MaxLength);
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
protected override void OnDetachingFrom(Entry bindable)
|
|
|
|
|
|
|
|
{
|
|
|
|
|
|
|
|
bindable.TextChanged -= bindable_TextChanged;
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
}
|