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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.Text;
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using System.Threading.Tasks;
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using Xamarin.Forms;
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namespace BookAStar.Behaviors
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{
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public class DecimalValidatorBehavior : Behavior<Entry>
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{
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// Creating BindableProperties with Limited write access: http://iosapi.xamarin.com/index.aspx?link=M%3AXamarin.Forms.BindableObject.SetValue(Xamarin.Forms.BindablePropertyKey%2CSystem.Object)
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static readonly BindablePropertyKey IsValidPropertyKey = BindableProperty.CreateReadOnly("IsValid", typeof(bool), typeof(DecimalValidatorBehavior), false);
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public static readonly BindableProperty IsValidProperty = IsValidPropertyKey.BindableProperty;
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public bool IsValid
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{
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get { return (bool)base.GetValue(IsValidProperty); }
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private set { base.SetValue(IsValidPropertyKey, value); }
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}
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protected override void OnAttachedTo(Entry bindable)
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{
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bindable.TextChanged += bindable_TextChanged;
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}
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private void bindable_TextChanged(object sender, TextChangedEventArgs e)
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{
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decimal result;
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IsValid = decimal.TryParse(e.NewTextValue, out result);
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((Entry)sender).TextColor = IsValid ? Color.Default : Color.Red;
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}
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protected override void OnDetachingFrom(Entry bindable)
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{
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bindable.TextChanged -= bindable_TextChanged;
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}
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}
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}
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