34 lines
1.1 KiB
C#
34 lines
1.1 KiB
C#
using System;
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using Xamarin.Forms;
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namespace Bit.App.Behaviors
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{
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public class RequiredValidationBehavior : Behavior<Entry>
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{
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private static readonly BindablePropertyKey IsValidPropertyKey = BindableProperty.CreateReadOnly("IsValid", typeof(bool), typeof(RequiredValidationBehavior), 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)GetValue(IsValidProperty); }
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private set { 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 += HandleTextChanged;
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}
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void HandleTextChanged(object sender, TextChangedEventArgs e)
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{
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IsValid = !string.IsNullOrWhiteSpace(e.NewTextValue);
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((Entry)sender).BackgroundColor = 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 -= HandleTextChanged;
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}
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}
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}
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