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‎src/Files.App.Controls/BreadcrumbBar/BreadcrumbBar.Events.cs‎

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// Copyright (c) Files Community
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// Licensed under the MIT License.
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using Microsoft.UI;
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using Microsoft.UI.Xaml;
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using Microsoft.UI.Xaml.Controls;
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using Microsoft.UI.Xaml.Input;
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using Microsoft.UI.Xaml.Markup;
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using Microsoft.UI.Xaml.Media;
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using Microsoft.UI.Xaml.Shapes;
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namespace Files.App.Controls
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{
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public partial class BreadcrumbBar
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{
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private void RootItemButton_PointerEntered(object sender, PointerRoutedEventArgs e)
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{
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VisualStateManager.GoToState(this, "PointerOverItem", true);
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}
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private void RootItemButton_PointerPressed(object sender, PointerRoutedEventArgs e)
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{
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VisualStateManager.GoToState(this, "PointerPressedOnItem", true);
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}
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private void RootItemButton_PointerReleased(object sender, PointerRoutedEventArgs e)
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{
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RootItemClicked?.Invoke(this, EventArgs.Empty);
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VisualStateManager.GoToState(this, "PointerOverItem", true);
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}
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private void RootItemButton_PointerExited(object sender, PointerRoutedEventArgs e)
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{
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VisualStateManager.GoToState(this, "PointerNormal", true);
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}
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private void RootChevronItemButton_PointerEntered(object sender, PointerRoutedEventArgs e)
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{
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VisualStateManager.GoToState(this, "PointerOverChevron", true);
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}
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private void RootChevronItemButton_PointerPressed(object sender, PointerRoutedEventArgs e)
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{
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VisualStateManager.GoToState(this, "PointerPressedOnChevron", true);
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}
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private void RootChevronItemButton_PointerReleased(object sender, PointerRoutedEventArgs e)
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{
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VisualStateManager.GoToState(this, "PointerOverChevron", true);
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FlyoutBase.ShowAttachedFlyout(_rootItemChevronButton);
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}
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private void RootChevronItemButton_PointerExited(object sender, PointerRoutedEventArgs e)
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{
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VisualStateManager.GoToState(this, "PointerNormal", true);
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}
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private void RootItemChevronDropDownMenuFlyout_Opening(object? sender, object e)
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{
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if (sender is not MenuFlyout flyout)
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return;
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RootItemDropDownFlyoutOpening?.Invoke(this, new(flyout));
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}
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private void RootItemChevronDropDownMenuFlyout_Opened(object? sender, object e)
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{
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VisualStateManager.GoToState(this, "ChevronNormalOn", true);
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}
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private void RootItemChevronDropDownMenuFlyout_Closed(object? sender, object e)
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{
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if (sender is not MenuFlyout flyout)
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return;
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RootItemDropDownFlyoutClosed?.Invoke(this, new(flyout));
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VisualStateManager.GoToState(this, "ChevronNormalOff", true);
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VisualStateManager.GoToState(this, "PointerNormal", true);
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}
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private void ItemsRepeater_ElementPrepared(ItemsRepeater sender, ItemsRepeaterElementPreparedEventArgs args)
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{
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if (args.Element is not BreadcrumbBarItem item)
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return;
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item.SetOwner(this);
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}
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}
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}

‎src/Files.App.Controls/BreadcrumbBar/BreadcrumbBar.Properties.cs‎

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// Copyright (c) Files Community
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// Licensed under the MIT License.
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using CommunityToolkit.WinUI;
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using Microsoft.UI;
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using Microsoft.UI.Xaml;
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using Microsoft.UI.Xaml.Controls;
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using Microsoft.UI.Xaml.Input;
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using Microsoft.UI.Xaml.Markup;
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using Microsoft.UI.Xaml.Media;
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using Microsoft.UI.Xaml.Shapes;
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namespace Files.App.Controls
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{
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public partial class BreadcrumbBar : Control
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{
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[GeneratedDependencyProperty]
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public partial object? ItemsSource { get; set; }
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[GeneratedDependencyProperty]
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public partial object? ItemTemplate { get; set; }
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[GeneratedDependencyProperty]
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public partial FrameworkElement? RootElement { get; set; }
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partial void OnItemsSourceChanged(object? newValue)
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{
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}
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partial void OnItemTemplateChanged(object? newValue)
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{
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}
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}
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}

‎src/Files.App.Controls/BreadcrumbBar/BreadcrumbBar.cs‎

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// Copyright (c) Files Community
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// Licensed under the MIT License.
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using CommunityToolkit.WinUI;
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using Microsoft.UI;
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using Microsoft.UI.Xaml;
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using Microsoft.UI.Xaml.Controls;
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using Microsoft.UI.Xaml.Input;
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using Microsoft.UI.Xaml.Markup;
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using Microsoft.UI.Xaml.Media;
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using Microsoft.UI.Xaml.Shapes;
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using System;
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using Windows.Foundation;
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namespace Files.App.Controls
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{
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// Template parts
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[TemplatePart(Name = "PART_ItemsRepeater", Type = typeof(ItemsRepeater))]
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public partial class BreadcrumbBar : Control
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{
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// Constants
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private const string TemplatePartName_RootItemButton = "PART_RootItemButton";
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private const string TemplatePartName_RootItemChevronButton = "PART_RootItemChevronButton";
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private const string TemplatePartName_RootElementChevronDropDownMenuFlyout = "PART_RootElementChevronDropDownMenuFlyout";
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private const string TemplatePartName_MainItemsRepeater = "PART_MainItemsRepeater";
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// Fields
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private BreadcrumbBarLayout _itemsRepeaterLayout = null!;
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private Border? _rootItemButton;
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private Border? _rootItemChevronButton;
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private MenuFlyout? _rootItemChevronDropDownMenuFlyout;
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private ItemsRepeater? _itemsRepeater;
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// Events
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public event TypedEventHandler<BreadcrumbBar, BreadcrumbBarItemClickedEventArgs>? ItemClicked;
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public event EventHandler<BreadcrumbBarItemDropDownFlyoutEventArgs>? ItemDropDownFlyoutOpening;
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public event EventHandler<BreadcrumbBarItemDropDownFlyoutEventArgs>? ItemDropDownFlyoutClosed;
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public event EventHandler? RootItemClicked;
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public event EventHandler<BreadcrumbBarItemDropDownFlyoutEventArgs>? RootItemDropDownFlyoutOpening;
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public event EventHandler<BreadcrumbBarItemDropDownFlyoutEventArgs>? RootItemDropDownFlyoutClosed;
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// Constructor
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public BreadcrumbBar()
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{
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DefaultStyleKey = typeof(BreadcrumbBar);
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_itemsRepeaterLayout = new(this, 2d);
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}
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// Methods
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protected override void OnApplyTemplate()
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{
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_rootItemButton = GetTemplateChild(TemplatePartName_RootItemButton) as Border
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?? throw new MissingFieldException($"Could not find {TemplatePartName_RootItemButton} in the given {nameof(BreadcrumbBar)}'s style.");
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_rootItemChevronButton = GetTemplateChild(TemplatePartName_RootItemChevronButton) as Border
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?? throw new MissingFieldException($"Could not find {TemplatePartName_RootItemChevronButton} in the given {nameof(BreadcrumbBar)}'s style.");
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_rootItemChevronDropDownMenuFlyout = GetTemplateChild(TemplatePartName_RootElementChevronDropDownMenuFlyout) as MenuFlyout
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?? throw new MissingFieldException($"Could not find {TemplatePartName_RootElementChevronDropDownMenuFlyout} in the given {nameof(BreadcrumbBar)}'s style.");
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_itemsRepeater = GetTemplateChild(TemplatePartName_MainItemsRepeater) as ItemsRepeater
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?? throw new MissingFieldException($"Could not find {TemplatePartName_MainItemsRepeater} in the given {nameof(BreadcrumbBar)}'s style.");
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_itemsRepeater.Layout = _itemsRepeaterLayout;
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_rootItemButton.PointerEntered += RootItemButton_PointerEntered;
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_rootItemButton.PointerPressed += RootItemButton_PointerPressed;
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_rootItemButton.PointerReleased += RootItemButton_PointerReleased;
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_rootItemButton.PointerExited += RootItemButton_PointerExited;
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_rootItemChevronButton.PointerEntered += RootChevronItemButton_PointerEntered;
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_rootItemChevronButton.PointerPressed += RootChevronItemButton_PointerPressed;
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_rootItemChevronButton.PointerReleased += RootChevronItemButton_PointerReleased;
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_rootItemChevronButton.PointerExited += RootChevronItemButton_PointerExited;
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_rootItemChevronDropDownMenuFlyout.Opening += RootItemChevronDropDownMenuFlyout_Opening;
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_rootItemChevronDropDownMenuFlyout.Opened += RootItemChevronDropDownMenuFlyout_Opened;
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_rootItemChevronDropDownMenuFlyout.Closed += RootItemChevronDropDownMenuFlyout_Closed;
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_itemsRepeater.ElementPrepared += ItemsRepeater_ElementPrepared;
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base.OnApplyTemplate();
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}
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internal void RaiseItemClickedEvent(BreadcrumbBarItem item)
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{
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var index = _itemsRepeater?.GetElementIndex(item) ?? throw new ArgumentNullException($"{_itemsRepeater} is null.");
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var eventArgs = new BreadcrumbBarItemClickedEventArgs(item, index);
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ItemClicked?.Invoke(this, eventArgs);
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}
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internal void RaiseItemDropDownFlyoutOpening(BreadcrumbBarItem item, MenuFlyout flyout)
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{
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var index = _itemsRepeater?.GetElementIndex(item) ?? throw new ArgumentNullException($"{_itemsRepeater} is null.");
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ItemDropDownFlyoutOpening?.Invoke(this, new(flyout, item, index));
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}
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internal void RaiseItemDropDownFlyoutClosed(BreadcrumbBarItem item, MenuFlyout flyout)
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{
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var index = _itemsRepeater?.GetElementIndex(item) ?? throw new ArgumentNullException($"{_itemsRepeater} is null.");
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ItemDropDownFlyoutClosed?.Invoke(this, new(flyout, item, index));
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}
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}
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}

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