396 lines
13 KiB
C#
396 lines
13 KiB
C#
using System.Windows.Input;
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using Avalonia;
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using Avalonia.Controls;
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using Avalonia.Controls.Metadata;
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using Avalonia.Controls.Mixins;
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using Avalonia.Controls.Primitives;
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using Avalonia.Controls.Templates;
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using Avalonia.Data;
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using Avalonia.Input;
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using Avalonia.Interactivity;
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using Avalonia.LogicalTree;
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using Avalonia.VisualTree;
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using Irihi.Avalonia.Shared.Common;
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using Irihi.Avalonia.Shared.Helpers;
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namespace Ursa.Controls;
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/// <summary>
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/// Navigation Menu Item
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/// </summary>
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[PseudoClasses(PC_Highlighted, PC_HorizontalCollapsed, PC_VerticalCollapsed, PC_FirstLevel, PC_Selector)]
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public class NavMenuItem: HeaderedItemsControl
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{
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public const string PC_Highlighted = ":highlighted";
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public const string PC_FirstLevel = ":first-level";
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public const string PC_HorizontalCollapsed = ":horizontal-collapsed";
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public const string PC_VerticalCollapsed = ":vertical-collapsed";
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public const string PC_Selector = ":selector";
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private NavMenu? _rootMenu;
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private Panel? _popupPanel;
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private Popup? _popup;
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private Panel? _overflowPanel;
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private static readonly Point s_invalidPoint = new (double.NaN, double.NaN);
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private Point _pointerDownPoint = s_invalidPoint;
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public static readonly StyledProperty<object?> IconProperty = AvaloniaProperty.Register<NavMenuItem, object?>(
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nameof(Icon));
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public object? Icon
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{
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get => GetValue(IconProperty);
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set => SetValue(IconProperty, value);
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}
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public static readonly StyledProperty<IDataTemplate?> IconTemplateProperty = AvaloniaProperty.Register<NavMenuItem, IDataTemplate?>(
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nameof(IconTemplate));
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public IDataTemplate? IconTemplate
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{
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get => GetValue(IconTemplateProperty);
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set => SetValue(IconTemplateProperty, value);
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}
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public static readonly StyledProperty<ICommand?> CommandProperty = Button.CommandProperty.AddOwner<NavMenuItem>();
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public ICommand? Command
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{
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get => GetValue(CommandProperty);
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set => SetValue(CommandProperty, value);
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}
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public static readonly StyledProperty<object?> CommandParameterProperty =
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Button.CommandParameterProperty.AddOwner<NavMenuItem>();
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public object? CommandParameter
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{
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get => GetValue(CommandParameterProperty);
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set => SetValue(CommandParameterProperty, value);
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}
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public static readonly StyledProperty<bool> IsSelectedProperty =
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SelectingItemsControl.IsSelectedProperty.AddOwner<NavMenuItem>();
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public bool IsSelected
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{
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get => GetValue(IsSelectedProperty);
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set => SetValue(IsSelectedProperty, value);
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}
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public static readonly RoutedEvent<RoutedEventArgs> IsSelectedChangedEvent = RoutedEvent.Register<SelectingItemsControl, RoutedEventArgs>("IsSelectedChanged", RoutingStrategies.Bubble);
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private bool _isHighlighted;
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public static readonly DirectProperty<NavMenuItem, bool> IsHighlightedProperty =
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AvaloniaProperty.RegisterDirect<NavMenuItem, bool>(
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nameof(IsHighlighted), o => o.IsHighlighted, (o, v) => o.IsHighlighted = v,
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defaultBindingMode: BindingMode.TwoWay);
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public bool IsHighlighted
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{
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get => _isHighlighted;
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private set => SetAndRaise(IsHighlightedProperty, ref _isHighlighted, value);
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}
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public static readonly StyledProperty<bool> IsHorizontalCollapsedProperty =
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NavMenu.IsHorizontalCollapsedProperty.AddOwner<NavMenuItem>();
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public bool IsHorizontalCollapsed
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{
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get => GetValue(IsHorizontalCollapsedProperty);
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set => SetValue(IsHorizontalCollapsedProperty, value);
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}
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public static readonly StyledProperty<bool> IsVerticalCollapsedProperty = AvaloniaProperty.Register<NavMenuItem, bool>(
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nameof(IsVerticalCollapsed));
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public bool IsVerticalCollapsed
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{
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get => GetValue(IsVerticalCollapsedProperty);
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set => SetValue(IsVerticalCollapsedProperty, value);
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}
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public static readonly StyledProperty<double> SubMenuIndentProperty =
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NavMenu.SubMenuIndentProperty.AddOwner<NavMenuItem>();
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public double SubMenuIndent
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{
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get => GetValue(SubMenuIndentProperty);
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set => SetValue(SubMenuIndentProperty, value);
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}
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internal static readonly DirectProperty<NavMenuItem, int> LevelProperty = AvaloniaProperty.RegisterDirect<NavMenuItem, int>(
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nameof(Level), o => o.Level, (o, v) => o.Level = v);
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private int _level;
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public int Level
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{
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get => _level;
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set => SetAndRaise(LevelProperty, ref _level, value);
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}
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public static readonly StyledProperty<bool> IsSeparatorProperty = AvaloniaProperty.Register<NavMenuItem, bool>(
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nameof(IsSeparator));
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public bool IsSeparator
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{
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get => GetValue(IsSeparatorProperty);
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set => SetValue(IsSeparatorProperty, value);
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}
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static NavMenuItem()
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{
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// SelectableMixin.Attach<NavMenuItem>(IsSelectedProperty);
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PressedMixin.Attach<NavMenuItem>();
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LevelProperty.Changed.AddClassHandler<NavMenuItem, int>((item, args) => item.OnLevelChange(args));
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IsHighlightedProperty.AffectsPseudoClass<NavMenuItem>(PC_Highlighted);
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IsHorizontalCollapsedProperty.AffectsPseudoClass<NavMenuItem>(PC_HorizontalCollapsed);
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IsVerticalCollapsedProperty.AffectsPseudoClass<NavMenuItem>(PC_VerticalCollapsed);
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IsSelectedProperty.AffectsPseudoClass<NavMenuItem>(PseudoClassName.PC_Selected, IsSelectedChangedEvent);
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IsHorizontalCollapsedProperty.Changed.AddClassHandler<NavMenuItem, bool>((item, args) =>
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item.OnIsHorizontalCollapsedChanged(args));
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}
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private void OnIsHorizontalCollapsedChanged(AvaloniaPropertyChangedEventArgs<bool> args)
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{
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if (args.NewValue.Value)
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{
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if (this.ItemsPanelRoot is OverflowStackPanel s)
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{
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s.MoveChildrenToOverflowPanel();
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}
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}
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else
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{
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if (this.ItemsPanelRoot is OverflowStackPanel s)
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{
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s.MoveChildrenToMainPanel();
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}
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}
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}
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private void OnLevelChange(AvaloniaPropertyChangedEventArgs<int> args)
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{
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PseudoClasses.Set(PC_FirstLevel, args.NewValue.Value == 1);
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}
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protected override bool NeedsContainerOverride(object? item, int index, out object? recycleKey)
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{
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return NeedsContainer<NavMenuItem>(item, out recycleKey);
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}
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protected override Control CreateContainerForItemOverride(object? item, int index, object? recycleKey)
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{
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return new NavMenuItem();
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}
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protected override void OnAttachedToVisualTree(VisualTreeAttachmentEventArgs e)
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{
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base.OnAttachedToVisualTree(e);
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_rootMenu = GetRootMenu();
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}
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protected override void OnApplyTemplate(TemplateAppliedEventArgs e)
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{
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base.OnApplyTemplate(e);
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SetCurrentValue(LevelProperty,CalculateDistanceFromLogicalParent<NavMenu>(this));
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_popup = e.NameScope.Find<Popup>("PART_Popup");
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_overflowPanel = e.NameScope.Find<Panel>("PART_OverflowPanel");
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if (_rootMenu is not null)
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{
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this.TryBind(IconProperty, _rootMenu.IconBinding);
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this.TryBind(HeaderProperty, _rootMenu.HeaderBinding);
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this.TryBind(ItemsSourceProperty, _rootMenu.SubMenuBinding);
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this.TryBind(CommandProperty, _rootMenu.CommandBinding);
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this[!IconTemplateProperty] = _rootMenu[!NavMenu.IconTemplateProperty];
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this[!HeaderTemplateProperty] = _rootMenu[!NavMenu.HeaderTemplateProperty];
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this[!SubMenuIndentProperty] = _rootMenu[!NavMenu.SubMenuIndentProperty];
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this[!IsHorizontalCollapsedProperty] = _rootMenu[!NavMenu.IsHorizontalCollapsedProperty];
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}
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}
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protected override void OnLoaded(RoutedEventArgs e)
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{
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base.OnLoaded(e);
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var root = this.ItemsPanelRoot;
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if (root is OverflowStackPanel stack)
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{
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stack.OverflowPanel = _overflowPanel;
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}
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}
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protected override void OnPointerPressed(PointerPressedEventArgs e)
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{
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if (IsSeparator)
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{
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e.Handled = true;
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return;
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}
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base.OnPointerPressed(e);
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if (e.Handled) return;
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var p = e.GetCurrentPoint(this);
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if (p.Properties.PointerUpdateKind is not (PointerUpdateKind.LeftButtonPressed
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or PointerUpdateKind.RightButtonPressed)) return;
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if (p.Pointer.Type == PointerType.Mouse)
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{
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if (this.ItemCount == 0)
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{
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SelectItem(this);
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Command?.Execute(CommandParameter);
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e.Handled = true;
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}
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else
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{
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if (!IsHorizontalCollapsed)
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{
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SetCurrentValue(IsVerticalCollapsedProperty, !IsVerticalCollapsed);
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e.Handled = true;
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}
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else
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{
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if (_popup is null || e.Source is not Visual v || _popup.IsInsidePopup(v)) return;
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if (_popup.IsOpen)
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{
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_popup.Close();
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}
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else
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{
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_popup.Open();
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}
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}
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}
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}
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else
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{
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_pointerDownPoint = p.Position;
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}
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}
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protected override void OnPointerReleased(PointerReleasedEventArgs e)
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{
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base.OnPointerReleased(e);
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if (!e.Handled && !double.IsNaN(_pointerDownPoint.X) &&
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e.InitialPressMouseButton is MouseButton.Left or MouseButton.Right)
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{
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var point = e.GetCurrentPoint(this);
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if (!new Rect(Bounds.Size).ContainsExclusive(point.Position) || e.Pointer.Type != PointerType.Touch) return;
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if (this.ItemCount == 0)
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{
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SelectItem(this);
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Command?.Execute(CommandParameter);
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e.Handled = true;
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}
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else
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{
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if (!IsHorizontalCollapsed)
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{
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SetCurrentValue(IsVerticalCollapsedProperty, !IsVerticalCollapsed);
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e.Handled = true;
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}
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else
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{
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if (_popup is null || e.Source is not Visual v || _popup.IsInsidePopup(v)) return;
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if (_popup.IsOpen)
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{
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_popup.Close();
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}
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else
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{
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_popup.Open();
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}
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}
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}
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}
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}
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internal void SelectItem(NavMenuItem item)
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{
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if (item == this)
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{
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SetCurrentValue(IsSelectedProperty, true);
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SetCurrentValue(IsHighlightedProperty, true);
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}
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else
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{
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SetCurrentValue(IsSelectedProperty, false);
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SetCurrentValue(IsHighlightedProperty, true);
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}
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if (this.Parent is NavMenuItem menuItem)
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{
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menuItem.SelectItem(item);
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var items = menuItem.LogicalChildren.OfType<NavMenuItem>();
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foreach (var child in items)
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{
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if (child != this)
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{
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child.ClearSelection();
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}
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}
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}
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else if (this.Parent is NavMenu menu)
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{
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menu.SelectItem(item, this);
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}
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if(_popup is not null)
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{
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_popup.Close();
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}
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}
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internal void ClearSelection()
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{
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SetCurrentValue(IsHighlightedProperty, false);
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SetCurrentValue(IsSelectedProperty, false);
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foreach (var child in LogicalChildren)
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{
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if (child is NavMenuItem item)
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{
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item.ClearSelection();
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}
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}
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}
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private NavMenu? GetRootMenu()
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{
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var root = this.FindAncestorOfType<NavMenu>() ?? this.FindLogicalAncestorOfType<NavMenu>();
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return root;
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}
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private static int CalculateDistanceFromLogicalParent<T>(ILogical? logical, int @default = -1) where T : class
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{
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var result = 0;
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while (logical != null && !(logical is T))
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{
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if (logical is NavMenuItem)
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{
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result++;
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}
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logical = logical.LogicalParent;
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}
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return logical != null ? result : @default;
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}
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internal IEnumerable<NavMenuItem> GetLeafMenus()
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{
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if (this.ItemCount == 0)
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{
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yield return this;
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yield break;
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}
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foreach (var child in LogicalChildren)
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{
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if (child is NavMenuItem item)
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{
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var items = item.GetLeafMenus();
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foreach (var i in items)
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{
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yield return i;
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}
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}
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}
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}
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} |