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Implement ItemTemplateSelector support on DragDropGridView.ItemsSource #6

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Implement ItemTemplateSelector support on DragDropGridView.ItemsSource #6

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b774718
Implement DatatemplateSelector support on DragDropGridView.Itemsource
KarsaOrlong1981 Dec 22, 2025
c65738a
Add Nullable checks and remove test variable
KarsaOrlong1981 Dec 22, 2025
5e7c520
Add back Windows check for ScrollView IsEnabled.
KarsaOrlong1981 Dec 22, 2025
51efab3
Refact code:
KarsaOrlong1981 Dec 31, 2025
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22 changes: 12 additions & 10 deletions DragDropGridView/DragDropGridView.Drag.Utilities.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -9,17 +9,19 @@ public partial class DragDropGridView
private void UpdateDisableScrollView(bool isDisabled)
{
#if ANDROID
if (_scrollView != null)
{
InternalLogger.Debug(Tag, () => $"UpdateScrollView( disabled: {isDisabled} )");
((UntouchableScrollviewHandler)_scrollView.Handler!).UpdateDisableScrolling(isDisabled);
}
if (_scrollView?.Handler is UntouchableScrollviewHandler scrollHandler &&
scrollHandler.PlatformView != null)
{
InternalLogger.Debug(Tag, () => $"UpdateScrollView( disabled: {isDisabled} )");
scrollHandler.UpdateDisableScrolling(isDisabled);
}

if (_refreshView != null)
{
InternalLogger.Debug(Tag, () => $"UpdateRefreshView( disabled: {isDisabled} )");
((UntouchableRefreshViewHandler)_refreshView.Handler!).UpdateDisableScrolling(isDisabled);
}
if (_refreshView?.Handler is UntouchableRefreshViewHandler refreshHandler &&
refreshHandler.PlatformView != null)
{
InternalLogger.Debug(Tag, () => $"UpdateRefreshView( disabled: {isDisabled} )");
refreshHandler.UpdateDisableScrolling(isDisabled);
}
#elif !WINDOWS
if (_scrollView != null)
{
Expand Down
29 changes: 26 additions & 3 deletions DragDropGridView/DragDropGridView.ItemsSource.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,13 @@ public partial class DragDropGridView
default(DataTemplate),
propertyChanged: OnItemTemplateChanged);

public static readonly BindableProperty ItemTemplateSelectorProperty = BindableProperty.Create(
nameof(ItemTemplateSelector),
typeof(DataTemplateSelector),
typeof(DragDropGridView),
default(DataTemplateSelector),
propertyChanged: OnItemTemplateChanged);

public IEnumerable ItemsSource
{
get => (IEnumerable)GetValue(ItemsSourceProperty);
Expand All @@ -31,6 +38,12 @@ public DataTemplate ItemTemplate
set => SetValue(ItemTemplateProperty, value);
}

public DataTemplateSelector ItemTemplateSelector
{
get => (DataTemplateSelector)GetValue(ItemTemplateSelectorProperty);
set => SetValue(ItemTemplateSelectorProperty, value);
}

private static void OnItemsSourceChanged(BindableObject bindable, object? oldValue, object? newValue)
{
if (bindable is not DragDropGridView gridLayout)
Expand All @@ -52,7 +65,7 @@ private static void OnItemsSourceChanged(BindableObject bindable, object? oldVal

foreach (var item in (IEnumerable)newValue)
{
if (gridLayout.ItemTemplate.CreateContent() is not View view)
if (gridLayout.GetTemplateForItem(item)?.CreateContent() is not View view)
{
continue;
}
Expand Down Expand Up @@ -89,7 +102,7 @@ private static void OnItemTemplateChanged(BindableObject bindable, object oldVal

foreach (var item in gridLayout.ItemsSource)
{
if (gridLayout.ItemTemplate.CreateContent() is not View view)
if (gridLayout.GetTemplateForItem(item)?.CreateContent() is not View view)
{
continue;
}
Expand All @@ -111,7 +124,7 @@ private void ItemsSourceCollectionChanged(object? sender, NotifyCollectionChange
case NotifyCollectionChangedAction.Add when e.NewItems is not null:
foreach (var item in e.NewItems)
{
if (ItemTemplate.CreateContent() is not View view)
if (GetTemplateForItem(item)?.CreateContent() is not View view)
{
continue;
}
Expand Down Expand Up @@ -155,5 +168,15 @@ private void ItemsSourceCollectionChanged(object? sender, NotifyCollectionChange
default:
throw new ArgumentOutOfRangeException();
}

}

private DataTemplate GetTemplateForItem(object item)
{
if (ItemTemplateSelector != null)
{
return ItemTemplateSelector.SelectTemplate(item, this);
}
return ItemTemplate;
}
}