Steven Kirk
7 years ago
3 changed files with 216 additions and 213 deletions
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// Copyright (c) The Avalonia Project. All rights reserved.
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// Licensed under the MIT license. See licence.md file in the project root for full license information.
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using System; |
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using System.Collections.Generic; |
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using System.Linq; |
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using Avalonia.Controls.Generators; |
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using Avalonia.Controls.Platform; |
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using Avalonia.Controls.Primitives; |
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using Avalonia.Controls.Templates; |
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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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namespace Avalonia.Controls |
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{ |
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/// <summary>
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/// Base class for menu controls.
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/// </summary>
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public abstract class MenuBase : SelectingItemsControl, IMenu |
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{ |
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/// <summary>
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/// Defines the <see cref="IsOpen"/> property.
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/// </summary>
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public static readonly DirectProperty<Menu, bool> IsOpenProperty = |
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AvaloniaProperty.RegisterDirect<Menu, bool>( |
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nameof(IsOpen), |
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o => o.IsOpen); |
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/// <summary>
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/// Defines the <see cref="MenuOpened"/> event.
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/// </summary>
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public static readonly RoutedEvent<RoutedEventArgs> MenuOpenedEvent = |
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RoutedEvent.Register<MenuItem, RoutedEventArgs>(nameof(MenuOpened), RoutingStrategies.Bubble); |
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/// <summary>
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/// Defines the <see cref="MenuClosed"/> event.
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/// </summary>
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public static readonly RoutedEvent<RoutedEventArgs> MenuClosedEvent = |
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RoutedEvent.Register<MenuItem, RoutedEventArgs>(nameof(MenuClosed), RoutingStrategies.Bubble); |
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private bool _isOpen; |
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/// <summary>
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/// Initializes a new instance of the <see cref="MenuBase"/> class.
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/// </summary>
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public MenuBase() |
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{ |
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InteractionHandler = AvaloniaLocator.Current.GetService<IMenuInteractionHandler>() ?? |
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new DefaultMenuInteractionHandler(); |
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} |
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/// <summary>
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/// Initializes a new instance of the <see cref="MenuBase"/> class.
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/// </summary>
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/// <param name="interactionHandler">The menu interaction handler.</param>
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public MenuBase(IMenuInteractionHandler interactionHandler) |
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{ |
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Contract.Requires<ArgumentNullException>(interactionHandler != null); |
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InteractionHandler = interactionHandler; |
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} |
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/// <summary>
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/// Initializes static members of the <see cref="MenuBase"/> class.
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/// </summary>
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static MenuBase() |
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{ |
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MenuItem.SubmenuOpenedEvent.AddClassHandler<MenuBase>(x => x.OnSubmenuOpened); |
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} |
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/// <summary>
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/// Gets a value indicating whether the menu is open.
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/// </summary>
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public bool IsOpen |
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{ |
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get { return _isOpen; } |
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protected set { SetAndRaise(IsOpenProperty, ref _isOpen, value); } |
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} |
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/// <inheritdoc/>
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IMenuInteractionHandler IMenu.InteractionHandler => InteractionHandler; |
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/// <inheritdoc/>
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IMenuItem IMenuElement.SelectedItem |
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{ |
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get |
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{ |
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var index = SelectedIndex; |
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return (index != -1) ? |
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(IMenuItem)ItemContainerGenerator.ContainerFromIndex(index) : |
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null; |
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} |
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set |
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{ |
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SelectedIndex = ItemContainerGenerator.IndexFromContainer(value); |
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} |
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} |
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/// <inheritdoc/>
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IEnumerable<IMenuItem> IMenuElement.SubItems |
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{ |
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get |
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{ |
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return ItemContainerGenerator.Containers |
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.Select(x => x.ContainerControl) |
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.OfType<IMenuItem>(); |
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} |
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} |
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/// <summary>
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/// Gets the interaction handler for the menu.
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/// </summary>
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protected IMenuInteractionHandler InteractionHandler { get; } |
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/// <summary>
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/// Occurs when a <see cref="Menu"/> is opened.
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/// </summary>
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public event EventHandler<RoutedEventArgs> MenuOpened |
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{ |
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add { AddHandler(MenuOpenedEvent, value); } |
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remove { RemoveHandler(MenuOpenedEvent, value); } |
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} |
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/// <summary>
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/// Occurs when a <see cref="Menu"/> is closed.
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/// </summary>
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public event EventHandler<RoutedEventArgs> MenuClosed |
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{ |
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add { AddHandler(MenuClosedEvent, value); } |
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remove { RemoveHandler(MenuClosedEvent, value); } |
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} |
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/// <summary>
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/// Closes the menu.
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/// </summary>
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public abstract void Close(); |
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/// <summary>
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/// Opens the menu.
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/// </summary>
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public abstract void Open(); |
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/// <inheritdoc/>
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bool IMenuElement.MoveSelection(NavigationDirection direction, bool wrap) => MoveSelection(direction, wrap); |
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/// <inheritdoc/>
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protected override IItemContainerGenerator CreateItemContainerGenerator() |
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{ |
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return new ItemContainerGenerator<MenuItem>(this, MenuItem.HeaderProperty, null); |
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} |
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/// <inheritdoc/>
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protected override void OnKeyDown(KeyEventArgs e) |
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{ |
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// Don't handle here: let the interaction handler handle it.
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} |
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/// <inheritdoc/>
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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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InteractionHandler.Attach(this); |
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} |
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/// <inheritdoc/>
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protected override void OnDetachedFromVisualTree(VisualTreeAttachmentEventArgs e) |
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{ |
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base.OnDetachedFromVisualTree(e); |
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InteractionHandler.Detach(this); |
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} |
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/// <summary>
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/// Called when a submenu opens somewhere in the menu.
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/// </summary>
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/// <param name="e">The event args.</param>
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protected virtual void OnSubmenuOpened(RoutedEventArgs e) |
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{ |
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if (e.Source is MenuItem menuItem && menuItem.Parent == this) |
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{ |
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foreach (var child in this.GetLogicalChildren().OfType<MenuItem>()) |
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{ |
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if (child != menuItem && child.IsSubMenuOpen) |
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{ |
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child.IsSubMenuOpen = false; |
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} |
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} |
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} |
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IsOpen = true; |
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} |
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} |
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} |
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