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update repeaterview to handle observables

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This commit is contained in:
Kyle Spearrin 2019-05-08 16:37:58 -04:00
parent cbda58f770
commit 8d0dc2d230
1 changed files with 40 additions and 9 deletions
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49
src/App/Controls/RepeaterView.cs
View file

@ -1,4 +1,5 @@
using System.Collections; using System.Collections;
using System.Collections.Specialized;
using Xamarin.Forms; using Xamarin.Forms;
namespace Bit.App.Controls namespace Bit.App.Controls
@ -10,7 +11,7 @@ namespace Bit.App.Controls
public static readonly BindableProperty ItemsSourceProperty = BindableProperty.Create( public static readonly BindableProperty ItemsSourceProperty = BindableProperty.Create(
nameof(ItemsSource), typeof(ICollection), typeof(RepeaterView), null, BindingMode.OneWay, nameof(ItemsSource), typeof(ICollection), typeof(RepeaterView), null, BindingMode.OneWay,
propertyChanged: ItemsChanged); propertyChanged: ItemsSourceChanging);
public RepeaterView() public RepeaterView()
{ {
@ -29,6 +30,27 @@ namespace Bit.App.Controls
set => SetValue(ItemTemplateProperty, value); set => SetValue(ItemTemplateProperty, value);
} }
private void OnCollectionChanged(object sender,
NotifyCollectionChangedEventArgs notifyCollectionChangedEventArgs)
{
Populate();
}
protected override void OnPropertyChanged(string propertyName = null)
{
base.OnPropertyChanged(propertyName);
if(propertyName == ItemTemplateProperty.PropertyName || propertyName == ItemsSourceProperty.PropertyName)
{
Populate();
}
}
protected override void OnBindingContextChanged()
{
base.OnBindingContextChanged();
Populate();
}
protected virtual View ViewFor(object item) protected virtual View ViewFor(object item)
{ {
View view = null; View view = null;
@ -46,18 +68,27 @@ namespace Bit.App.Controls
return view; return view;
} }
private static void ItemsChanged(BindableObject bindable, object oldValue, object newValue) private void Populate()
{ {
if(bindable is RepeaterView control) if(ItemsSource != null)
{ {
control.Children.Clear(); Children.Clear();
if(newValue is ICollection items) foreach(var item in ItemsSource)
{ {
foreach(var item in items) Children.Add(ViewFor(item));
}
}
}
private static void ItemsSourceChanging(BindableObject bindable, object oldValue, object newValue)
{ {
control.Children.Add(control.ViewFor(item)); if(oldValue != null && oldValue is INotifyCollectionChanged ov)
} {
} ov.CollectionChanged -= (bindable as RepeaterView).OnCollectionChanged;
}
if(newValue != null && newValue is INotifyCollectionChanged nv)
{
nv.CollectionChanged += (bindable as RepeaterView).OnCollectionChanged;
} }
} }
} }