diff options
Diffstat (limited to 'Xamarin.Forms.Pages/DataPage.cs')
-rw-r--r-- | Xamarin.Forms.Pages/DataPage.cs | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/Xamarin.Forms.Pages/DataPage.cs b/Xamarin.Forms.Pages/DataPage.cs new file mode 100644 index 00000000..1ec28d5c --- /dev/null +++ b/Xamarin.Forms.Pages/DataPage.cs @@ -0,0 +1,76 @@ +using System.Collections.Generic; +using System.Linq; + +namespace Xamarin.Forms.Pages +{ + public class DataPage : ContentPage, IDataSourceProvider + { + public static readonly BindableProperty DataProperty = BindableProperty.Create(nameof(Data), typeof(IEnumerable<IDataItem>), typeof(DataPage), default(IEnumerable<IDataItem>)); + + public static readonly BindableProperty DataSourceProperty = BindableProperty.Create(nameof(DataSource), typeof(IDataSource), typeof(DataPage), null, propertyChanged: OnDataSourceChanged); + + public static readonly BindableProperty DefaultItemTemplateProperty = BindableProperty.Create(nameof(DefaultItemTemplate), typeof(DataTemplate), typeof(DataPage), default(DataTemplate)); + + readonly HashSet<string> _maskedKeys = new HashSet<string>(); + + public DataPage() + { + 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 = (DataPage)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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