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@ -1,5 +1,8 @@ |
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using System; |
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using Avalonia.Collections; |
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using Avalonia.Controls.Presenters; |
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using Avalonia.Controls.Templates; |
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using Avalonia.Data; |
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using Avalonia.LogicalTree; |
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namespace Avalonia.Controls.Primitives |
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@ -9,12 +12,21 @@ namespace Avalonia.Controls.Primitives |
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/// </summary>
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public class HeaderedSelectingItemsControl : SelectingItemsControl, IContentPresenterHost |
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{ |
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private IDisposable? _itemsBinding; |
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private ItemsControl? _prepareItemContainerOnAttach; |
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/// <summary>
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/// Defines the <see cref="Header"/> property.
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/// </summary>
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public static readonly StyledProperty<object?> HeaderProperty = |
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HeaderedContentControl.HeaderProperty.AddOwner<HeaderedSelectingItemsControl>(); |
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/// <summary>
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/// Defines the <see cref="HeaderTemplate"/> property.
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/// </summary>
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public static readonly StyledProperty<IDataTemplate?> HeaderTemplateProperty = |
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HeaderedItemsControl.HeaderTemplateProperty.AddOwner<HeaderedSelectingItemsControl>(); |
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/// <summary>
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/// Initializes static members of the <see cref="ContentControl"/> class.
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/// </summary>
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@ -32,6 +44,15 @@ namespace Avalonia.Controls.Primitives |
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set { SetValue(HeaderProperty, value); } |
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} |
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/// <summary>
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/// Gets or sets the data template used to display the header content of the control.
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/// </summary>
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public IDataTemplate? HeaderTemplate |
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{ |
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get => GetValue(HeaderTemplateProperty); |
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set => SetValue(HeaderTemplateProperty, value); |
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} |
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/// <summary>
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/// Gets the header presenter from the control's template.
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/// </summary>
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@ -50,6 +71,17 @@ namespace Avalonia.Controls.Primitives |
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return RegisterContentPresenter(presenter); |
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} |
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protected override void OnAttachedToLogicalTree(LogicalTreeAttachmentEventArgs e) |
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{ |
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base.OnAttachedToLogicalTree(e); |
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if (_prepareItemContainerOnAttach is not null) |
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{ |
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PrepareItemContainer(_prepareItemContainerOnAttach); |
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_prepareItemContainerOnAttach = null; |
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} |
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} |
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/// <summary>
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/// Called when an <see cref="IContentPresenter"/> is registered with the control.
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/// </summary>
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@ -65,6 +97,37 @@ namespace Avalonia.Controls.Primitives |
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return false; |
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} |
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internal void PrepareItemContainer(ItemsControl parent) |
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{ |
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_itemsBinding?.Dispose(); |
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_itemsBinding = null; |
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var item = Header; |
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if (item is null) |
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{ |
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_prepareItemContainerOnAttach = null; |
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return; |
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} |
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var headerTemplate = HeaderTemplate ?? parent.ItemTemplate; |
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if (headerTemplate is null) |
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{ |
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if (((ILogical)this).IsAttachedToLogicalTree) |
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headerTemplate = this.FindDataTemplate(item); |
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else |
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_prepareItemContainerOnAttach = parent; |
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} |
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if (headerTemplate is ITreeDataTemplate treeTemplate && |
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treeTemplate.Match(item) && |
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treeTemplate.ItemsSelector(item) is { } itemsBinding) |
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{ |
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_itemsBinding = BindingOperations.Apply(this, ItemsSourceProperty, itemsBinding, null); |
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} |
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} |
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private void HeaderChanged(AvaloniaPropertyChangedEventArgs e) |
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{ |
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if (e.OldValue is ILogical oldChild) |
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Max Katz
4 years ago
GitHub