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gives the billing line description a maximum length

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Paul Schneider 2016-10-12 03:54:53 +02:00
commit 2b02d8c01a
2 changed files with 38 additions and 3 deletions
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29
BookAStar/BookAStar/Behaviors/MaxLengthValidator.cs
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@ -7,6 +7,35 @@ using Xamarin.Forms;
namespace BookAStar.Behaviors
{
public class EditorMaxLengthValidator : Behavior<Editor>
{
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(Editor bindable)
{
bindable.TextChanged += bindable_TextChanged;
}
public bool IsValid { get; set; }
private void bindable_TextChanged(object sender, TextChangedEventArgs e)
{
IsValid = e.NewTextValue.Length <= 0 || e.NewTextValue.Length <= MaxLength;
if (!IsValid && e.NewTextValue.Length > MaxLength)
((Editor)sender).Text = e.NewTextValue.Substring(0, MaxLength);
}
protected override void OnDetachingFrom(Editor bindable)
{
bindable.TextChanged -= bindable_TextChanged;
}
}
public class MaxLengthValidator : Behavior<Entry>
{
public static readonly BindableProperty MaxLengthProperty = BindableProperty.Create("MaxLength", typeof(int), typeof(MaxLengthValidator), 0);