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feat: deal with virtualization.

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This commit is contained in:
rabbitism
2024-03-25 11:10:11 +08:00
parent b15d237056
commit e600937fd7
3 changed files with 228 additions and 41 deletions
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72
src/Ursa/Controls/ComboBox/MultiComboBox.cs
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@@ -2,19 +2,17 @@
using System.Collections.ObjectModel;
using System.Collections.Specialized;
using Avalonia;
using Avalonia.Collections;
using Avalonia.Controls;
using Avalonia.Controls.Metadata;
using Avalonia.Controls.Primitives;
using Avalonia.Controls.Templates;
using Irihi.Avalonia.Shared.Helpers;
namespace Ursa.Controls;
[TemplatePart( PART_ListBox, typeof(ListBox))]
public class MultiComboBox: SelectingItemsControl
{
public const string PART_ListBox = "PART_ListBox";
private ListBox? _listBox;
private static ITemplate<Panel?> _defaultPanel = new FuncTemplate<Panel?>(() => new VirtualizingStackPanel());
public static readonly StyledProperty<bool> IsDropDownOpenProperty =
@@ -26,8 +24,17 @@ public class MultiComboBox: SelectingItemsControl
set => SetValue(IsDropDownOpenProperty, value);
}
public static readonly StyledProperty<double> MaxDropdownHeightProperty = AvaloniaProperty.Register<MultiComboBox, double>(
nameof(MaxDropdownHeight));
public double MaxDropdownHeight
{
get => GetValue(MaxDropdownHeightProperty);
set => SetValue(MaxDropdownHeightProperty, value);
}
public new static readonly StyledProperty<IList?> SelectedItemsProperty = AvaloniaProperty.Register<MultiComboBox, IList?>(
nameof(SelectedItems));
nameof(SelectedItems), new AvaloniaList<object>());
public new IList? SelectedItems
{
@@ -43,14 +50,46 @@ public class MultiComboBox: SelectingItemsControl
protected override bool NeedsContainerOverride(object? item, int index, out object? recycleKey)
{
return NeedsContainer<MultiComboBoxItem>(item, out recycleKey);
recycleKey = item;
return item is not MultiComboBoxItem;
}
protected override Control CreateContainerForItemOverride(object? item, int index, object? recycleKey)
{
return new MultiComboBoxItem();
}
private Dictionary<int, IDisposable?> _disposables = new Dictionary<int, IDisposable?>();
protected override void PrepareContainerForItemOverride(Control container, object? item, int index)
{
base.PrepareContainerForItemOverride(container, item, index);
if(_disposables.TryGetValue(index, out var d))
{
d?.Dispose();
_disposables.Remove(index);
}
if (container is MultiComboBoxItem comboBoxItem)
{
comboBoxItem.IsSelected = SelectedItems?.Contains(item) ?? false;
var disposable = MultiComboBoxItem.IsSelectedProperty.Changed.Subscribe(a =>
{
if (a.Sender == comboBoxItem)
{
if (comboBoxItem.IsSelected)
{
SelectedItems?.Add(item);
}
else
{
SelectedItems?.Remove(item);
}
}
});
_disposables[index] = disposable;
}
}
internal void ItemFocused(MultiComboBoxItem dropDownItem)
{
if (IsDropDownOpen && dropDownItem.IsFocused && dropDownItem.IsArrangeValid)
@@ -58,22 +97,5 @@ public class MultiComboBox: SelectingItemsControl
dropDownItem.BringIntoView();
}
}
protected override void OnApplyTemplate(TemplateAppliedEventArgs e)
{
base.OnApplyTemplate(e);
_listBox = e.NameScope.Find<ListBox>(PART_ListBox);
if (_listBox != null)
{
_listBox.SelectionChanged += ListBox_SelectionChanged;
}
}
private void ListBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
if (sender == _listBox)
{
this.SelectedItems = _listBox.SelectedItems;
}
}
}