Add properties to hide global header/footer

Author: Redth

VirtualListView/Controls/VirtualListView.cs

@@ -30,6 +30,15 @@ public IView GlobalHeader
 	public static readonly BindableProperty GlobalHeaderProperty =
 		BindableProperty.Create(nameof(GlobalHeader), typeof(IView), typeof(VirtualListView), default);
 
+	public bool IsHeaderVisible
+	{
+		get => (bool)GetValue(IsHeaderVisibleProperty);
+		set => SetValue(IsHeaderVisibleProperty, value);
+	}
+
+	public static readonly BindableProperty IsHeaderVisibleProperty =
+		BindableProperty.Create(nameof(IsHeaderVisible), typeof(bool), typeof(VirtualListView), true);
+
 	public IView GlobalFooter
 	{
 		get => (IView)GetValue(GlobalFooterProperty);
@@ -40,6 +49,15 @@ public IView GlobalFooter
 		BindableProperty.Create(nameof(GlobalFooter), typeof(IView), typeof(VirtualListView), default);
 
 
+	public bool IsFooterVisible
+	{
+		get => (bool)GetValue(IsFooterVisibleProperty);
+		set => SetValue(IsFooterVisibleProperty, value);
+	}
+
+	public static readonly BindableProperty IsFooterVisibleProperty =
+		BindableProperty.Create(nameof(IsFooterVisible), typeof(bool), typeof(VirtualListView), true);
+
 
 	public DataTemplate ItemTemplate
 	{

VirtualListView/IVirtualListView.cs

@@ -10,8 +10,12 @@ public interface IVirtualListView : IView
 
 	IView Header { get; }
 
+	bool IsHeaderVisible { get; }
+
 	IView Footer { get; }
 
+	bool IsFooterVisible { get; }
+
 	event EventHandler<ScrolledEventArgs> OnScrolled;
 
 	void Scrolled(double x, double y);

VirtualListView/PositionalViewSelector.cs

@@ -7,8 +7,14 @@ internal class PositionalViewSelector
 	public readonly IVirtualListView VirtualListView;
 	public IVirtualListViewAdapter Adapter => VirtualListView?.Adapter;
 	public IVirtualListViewSelector ViewSelector => VirtualListView?.ViewSelector;
-	public bool HasGlobalHeader => (VirtualListView?.Header?.Visibility ?? Visibility.Collapsed) == Visibility.Visible;
-	public bool HasGlobalFooter => (VirtualListView?.Footer?.Visibility ?? Visibility.Collapsed) == Visibility.Visible;
+
+	public bool HasGlobalHeader =>
+		(VirtualListView?.IsHeaderVisible ?? false)
+			&& (VirtualListView?.Header?.Visibility ?? Visibility.Collapsed) == Visibility.Visible;
+
+	public bool HasGlobalFooter =>
+		(VirtualListView?.IsFooterVisible ?? false)
+			&& (VirtualListView?.Footer?.Visibility ?? Visibility.Collapsed) == Visibility.Visible;
 
 	public PositionalViewSelector(IVirtualListView virtualListView)
 	{

VirtualListView/VirtualListViewHandler.cs

@@ -8,7 +8,9 @@ public partial class VirtualListViewHandler
 	{
 		[nameof(IVirtualListView.Adapter)] = MapAdapter,
 		[nameof(IVirtualListView.Header)] = MapHeader,
+		[nameof(IVirtualListView.IsHeaderVisible)] = MapIsHeaderVisible,
 		[nameof(IVirtualListView.Footer)] = MapFooter,
+		[nameof(IVirtualListView.IsFooterVisible)] = MapIsFooterVisible,
 		[nameof(IVirtualListView.ViewSelector)] = MapViewSelector,
 		[nameof(IVirtualListView.SelectionMode)] = MapSelectionMode,
 		[nameof(IVirtualListView.Orientation)] = MapOrientation,
@@ -103,4 +105,15 @@ public static void MapSelectedItems(VirtualListViewHandler handler, IVirtualList
 		// Keep track of the new state for next time it changes
 		handler.previousSelections = newSelections.ToArray();
 	}
+
+	public static void MapIsHeaderVisible(VirtualListViewHandler handler, IVirtualListView virtualListView)
+	{
+		handler?.InvalidateData();
+	}
+
+	public static void MapIsFooterVisible(VirtualListViewHandler handler, IVirtualListView virtualListView)
+	{
+		handler?.InvalidateData();
+	}
+
 }