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using System.Collections.Generic;
using System.Linq;
namespace Xamarin.Forms.Pages
{
public class DataView : ContentView, IDataSourceProvider
{
public static readonly BindableProperty DataProperty = BindableProperty.Create(nameof(Data), typeof(IEnumerable<IDataItem>), typeof(DataView), default(IEnumerable<IDataItem>));
public static readonly BindableProperty DataSourceProperty = BindableProperty.Create(nameof(DataSource), typeof(IDataSource), typeof(DataView), null, propertyChanged: OnDataSourceChanged);
public static readonly BindableProperty DefaultItemTemplateProperty = BindableProperty.Create(nameof(DefaultItemTemplate), typeof(DataTemplate), typeof(DataView), default(DataTemplate));
readonly HashSet<string> _maskedKeys = new HashSet<string>();
public DataView()
{
SetBinding(DataProperty, new Binding("DataSource.Data", source: this));
}
public IEnumerable<IDataItem> Data
{
get { return (IEnumerable<IDataItem>)GetValue(DataProperty); }
set { SetValue(DataProperty, value); }
}
public DataTemplate DefaultItemTemplate
{
get { return (DataTemplate)GetValue(DefaultItemTemplateProperty); }
set { SetValue(DefaultItemTemplateProperty, value); }
}
public IDataSource DataSource
{
get { return (IDataSource)GetValue(DataSourceProperty); }
set { SetValue(DataSourceProperty, value); }
}
void IDataSourceProvider.MaskKey(string key)
{
_maskedKeys.Add(key);
IDataSource dataSource = DataSource;
if (dataSource != null && !dataSource.MaskedKeys.Contains(key))
{
dataSource.MaskKey(key);
}
}
void IDataSourceProvider.UnmaskKey(string key)
{
_maskedKeys.Remove(key);
DataSource?.UnmaskKey(key);
}
static void OnDataSourceChanged(BindableObject bindable, object oldValue, object newValue)
{
var dataView = (DataView)bindable;
var dataSource = (IDataSource)newValue;
var oldSource = (IDataSource)oldValue;
if (oldSource != null)
{
foreach (string key in dataView._maskedKeys)
oldSource.UnmaskKey(key);
}
if (dataSource != null)
{
foreach (string key in dataView._maskedKeys)
{
dataSource.MaskKey(key);
}
}
}
}
}
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