protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
if (e.PropertyName == VirtualListView.AdapterProperty.PropertyName)
{
collectionView.ReloadData();
}
else if (e.PropertyName == VirtualListView.SelectionModeProperty.PropertyName)
{
collectionView.AllowsSelection = Element.SelectionMode != SelectionMode.None;
collectionView.AllowsMultipleSelection = Element.SelectionMode == SelectionMode.Multiple;
}
else if (e.PropertyName == VirtualListView.HeaderTemplateProperty.PropertyName ||
e.PropertyName == VirtualListView.FooterTemplateProperty.PropertyName ||
e.PropertyName == VirtualListView.ItemTemplateProperty.PropertyName ||
e.PropertyName == VirtualListView.ItemTemplateSelectorProperty.PropertyName ||
e.PropertyName == VirtualListView.SectionFooterTemplateProperty.PropertyName ||
e.PropertyName == VirtualListView.SectionFooterTemplateSelectorProperty.PropertyName ||
e.PropertyName == VirtualListView.SectionHeaderTemplateProperty.PropertyName ||
e.PropertyName == VirtualListView.SectionHeaderTemplateSelectorProperty.PropertyName)
{
TemplateSelector = CreateTemplateSelector();
DataSource.ResetTemplates(collectionView);
collectionView.ReloadData();
collectionView.CollectionViewLayout.InvalidateLayout();
}
}
protected override void OnElementChanged(Xamarin.Forms.Platform.UWP.ElementChangedEventArgs <VirtualListView> e)
{
base.OnElementChanged(e);
// Clean up old
if (e.OldElement != null)
{
// Unsubscribe from event handlers and cleanup any resources
listView.ChoosingItemContainer -= ListView_ChoosingItemContainer;
dataSource.Adapter = null;
dataSource.TemplateSelector = null;
dataSource = null;
templateSelector = null;
listView = null;
}
// Setup new
if (e.NewElement != null)
{
// Create the native control
if (Control == null)
{
listView = new ListView();
templateSelector = CreateTemplateSelector();
dataSource = new UwpDataSource();
dataSource.TemplateSelector = templateSelector;
dataSource.Adapter = e.NewElement.Adapter;
listView.ItemsSource = dataSource;
var style = new Style(typeof(ListView));
listView.Style = style;
listView.ItemContainerStyle = new Style(typeof(UwpListViewItem));
listView.ChoosingItemContainer += ListView_ChoosingItemContainer;
listView.ContainerContentChanging += ListView_ContainerContentChanging;
SetNativeControl(listView);
}
}
}
protected override void OnElementChanged(ElementChangedEventArgs <VirtualListView> e)
{
base.OnElementChanged(e);
// Clean up old
if (e.OldElement != null)
{
}
// Setup new
if (e.NewElement != null)
{
TemplateSelector = CreateTemplateSelector();
Adapter = e.NewElement.Adapter;
// Create the native control
if (Control == null)
{
layout = new CvLayout();
layout.EstimatedItemSize = UICollectionViewFlowLayout.AutomaticSize;
layout.SectionInset = new UIEdgeInsets(0, 0, 0, 0);
layout.MinimumInteritemSpacing = 0f;
layout.MinimumLineSpacing = 0f;
DataSource = new CvDataSource(this);
DataSource.IsSelectedHandler = (realSection, realIndex) =>
e?.NewElement?.IsItemSelected(realSection, realIndex) ?? false;
cvdelegate = new CvDelegate(this);
collectionView = new UICollectionView(this.Frame, layout);
collectionView.AllowsSelection = e.NewElement.SelectionMode != SelectionMode.None;
collectionView.AllowsMultipleSelection = e.NewElement.SelectionMode == SelectionMode.Multiple;
collectionView.DataSource = DataSource;
collectionView.ContentInset = new UIEdgeInsets(0, 0, 0, 0);
collectionView.Delegate = cvdelegate;
SetNativeControl(collectionView);
collectionView.ReloadData();
}
}
}
