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@ -1,7 +1,11 @@ |
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using System; |
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using System.Threading; |
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using Avalonia.Animation; |
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using Avalonia.Controls.Metadata; |
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using Avalonia.Controls.Primitives; |
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using Avalonia.Data; |
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using Avalonia.Interactivity; |
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using Avalonia.Threading; |
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namespace Avalonia.Controls |
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{ |
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@ -37,12 +41,24 @@ namespace Avalonia.Controls |
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[PseudoClasses(":expanded", ":up", ":down", ":left", ":right")] |
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public class Expander : HeaderedContentControl |
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{ |
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/// <summary>
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/// Defines the <see cref="ContentTransition"/> property.
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/// </summary>
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public static readonly StyledProperty<IPageTransition?> ContentTransitionProperty = |
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AvaloniaProperty.Register<Expander, IPageTransition?>(nameof(ContentTransition)); |
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AvaloniaProperty.Register<Expander, IPageTransition?>( |
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nameof(ContentTransition)); |
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/// <summary>
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/// Defines the <see cref="ExpandDirection"/> property.
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/// </summary>
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public static readonly StyledProperty<ExpandDirection> ExpandDirectionProperty = |
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AvaloniaProperty.Register<Expander, ExpandDirection>(nameof(ExpandDirection), ExpandDirection.Down); |
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AvaloniaProperty.Register<Expander, ExpandDirection>( |
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nameof(ExpandDirection), |
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ExpandDirection.Down); |
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/// <summary>
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/// Defines the <see cref="IsExpanded"/> property.
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/// </summary>
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public static readonly DirectProperty<Expander, bool> IsExpandedProperty = |
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AvaloniaProperty.RegisterDirect<Expander, bool>( |
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nameof(IsExpanded), |
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@ -50,47 +66,206 @@ namespace Avalonia.Controls |
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(o, v) => o.IsExpanded = v, |
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defaultBindingMode: Data.BindingMode.TwoWay); |
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/// <summary>
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/// Defines the <see cref="Collapsed"/> event.
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/// </summary>
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public static readonly RoutedEvent<RoutedEventArgs> CollapsedEvent = |
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RoutedEvent.Register<Expander, RoutedEventArgs>( |
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nameof(Collapsed), |
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RoutingStrategies.Bubble); |
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/// <summary>
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/// Defines the <see cref="Collapsing"/> event.
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/// </summary>
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public static readonly RoutedEvent<RoutedEventArgs> CollapsingEvent = |
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RoutedEvent.Register<Expander, RoutedEventArgs>( |
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nameof(Collapsing), |
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RoutingStrategies.Bubble); |
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/// <summary>
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/// Defines the <see cref="Expanded"/> event.
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/// </summary>
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public static readonly RoutedEvent<RoutedEventArgs> ExpandedEvent = |
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RoutedEvent.Register<Expander, RoutedEventArgs>( |
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nameof(Expanded), |
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RoutingStrategies.Bubble); |
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/// <summary>
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/// Defines the <see cref="Expanding"/> event.
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/// </summary>
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public static readonly RoutedEvent<RoutedEventArgs> ExpandingEvent = |
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RoutedEvent.Register<Expander, RoutedEventArgs>( |
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nameof(Expanding), |
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RoutingStrategies.Bubble); |
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private bool _ignorePropertyChanged = false; |
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private bool _isExpanded; |
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private CancellationTokenSource? _lastTransitionCts; |
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static Expander() |
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{ |
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IsExpandedProperty.Changed.AddClassHandler<Expander>((x, e) => x.OnIsExpandedChanged(e)); |
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} |
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/// <summary>
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/// Initializes a new instance of the <see cref="Expander"/> class.
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/// </summary>
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public Expander() |
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{ |
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UpdatePseudoClasses(ExpandDirection); |
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UpdatePseudoClasses(); |
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} |
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/// <summary>
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/// Gets or sets the transition used when expanding or collapsing the content.
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/// </summary>
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public IPageTransition? ContentTransition |
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{ |
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get => GetValue(ContentTransitionProperty); |
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set => SetValue(ContentTransitionProperty, value); |
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} |
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/// <summary>
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/// Gets or sets the direction in which the <see cref="Expander"/> opens.
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/// </summary>
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public ExpandDirection ExpandDirection |
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{ |
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get => GetValue(ExpandDirectionProperty); |
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set => SetValue(ExpandDirectionProperty, value); |
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} |
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/// <summary>
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/// Gets or sets a value indicating whether the <see cref="Expander"/>
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/// content area is open and visible.
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/// </summary>
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public bool IsExpanded |
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{ |
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get { return _isExpanded; } |
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set |
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{ |
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SetAndRaise(IsExpandedProperty, ref _isExpanded, value); |
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PseudoClasses.Set(":expanded", value); |
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get => _isExpanded; |
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set |
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{ |
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// It is important here that IsExpanded is a direct property so events can be invoked
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// BEFORE the property system gets notified of updated values. This is because events
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// may be canceled by external code.
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if (_isExpanded != value) |
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{ |
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RoutedEventArgs eventArgs; |
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if (value) |
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{ |
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eventArgs = new RoutedEventArgs(ExpandingEvent, this); |
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OnExpanding(eventArgs); |
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} |
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else |
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{ |
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eventArgs = new RoutedEventArgs(CollapsingEvent, this); |
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OnCollapsing(eventArgs); |
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} |
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if (eventArgs.Handled) |
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{ |
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// If the event was externally handled (canceled) we must still notify the value has changed.
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// This property changed notification will update any external code observing this property that itself may have set the new value.
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// We are essentially reverted any external state change along with ignoring the IsExpanded property set.
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// Remember IsExpanded is usually controlled by a ToggleButton in the control theme.
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_ignorePropertyChanged = true; |
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RaisePropertyChanged( |
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IsExpandedProperty, |
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oldValue: value, |
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newValue: _isExpanded, |
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BindingPriority.LocalValue, |
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isEffectiveValue: true); |
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_ignorePropertyChanged = false; |
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} |
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else |
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{ |
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SetAndRaise(IsExpandedProperty, ref _isExpanded, value); |
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} |
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} |
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} |
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} |
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protected virtual async void OnIsExpandedChanged(AvaloniaPropertyChangedEventArgs e) |
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/// <summary>
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/// Occurs after the content area has closed and only the header is visible.
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/// </summary>
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public event EventHandler<RoutedEventArgs>? Collapsed |
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{ |
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add => AddHandler(CollapsedEvent, value); |
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remove => RemoveHandler(CollapsedEvent, value); |
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} |
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/// <summary>
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/// Occurs as the content area is closing.
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/// </summary>
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/// <remarks>
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/// The event args <see cref="RoutedEventArgs.Handled"/> property may be set to true to cancel the event
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/// and keep the control open (expanded).
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/// </remarks>
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public event EventHandler<RoutedEventArgs>? Collapsing |
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{ |
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add => AddHandler(CollapsingEvent, value); |
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remove => RemoveHandler(CollapsingEvent, value); |
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} |
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/// <summary>
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/// Occurs after the <see cref="Expander"/> has opened to display both its header and content.
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/// </summary>
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public event EventHandler<RoutedEventArgs>? Expanded |
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{ |
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add => AddHandler(ExpandedEvent, value); |
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remove => RemoveHandler(ExpandedEvent, value); |
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} |
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/// <summary>
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/// Occurs as the content area is opening.
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/// </summary>
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/// <remarks>
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/// The event args <see cref="RoutedEventArgs.Handled"/> property may be set to true to cancel the event
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/// and keep the control closed (collapsed).
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/// </remarks>
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public event EventHandler<RoutedEventArgs>? Expanding |
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{ |
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add => AddHandler(ExpandingEvent, value); |
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remove => RemoveHandler(ExpandingEvent, value); |
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} |
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/// <summary>
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/// Invoked just before the <see cref="Collapsed"/> event.
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/// </summary>
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protected virtual void OnCollapsed(RoutedEventArgs eventArgs) |
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{ |
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RaiseEvent(eventArgs); |
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} |
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/// <summary>
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/// Invoked just before the <see cref="Collapsing"/> event.
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/// </summary>
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protected virtual void OnCollapsing(RoutedEventArgs eventArgs) |
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{ |
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RaiseEvent(eventArgs); |
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} |
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/// <summary>
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/// Invoked just before the <see cref="Expanded"/> event.
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/// </summary>
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protected virtual void OnExpanded(RoutedEventArgs eventArgs) |
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{ |
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RaiseEvent(eventArgs); |
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} |
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/// <summary>
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/// Invoked just before the <see cref="Expanding"/> event.
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/// </summary>
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protected virtual void OnExpanding(RoutedEventArgs eventArgs) |
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{ |
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RaiseEvent(eventArgs); |
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} |
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/// <summary>
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/// Starts the content transition (if set) and invokes the <see cref="Expanded"/>
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/// and <see cref="Collapsed"/> events when completed.
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/// </summary>
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private async void StartContentTransition() |
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{ |
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if (Content != null && ContentTransition != null && Presenter is Visual visualContent) |
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{ |
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bool forward = ExpandDirection == ExpandDirection.Left || |
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ExpandDirection == ExpandDirection.Up; |
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ExpandDirection == ExpandDirection.Up; |
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_lastTransitionCts?.Cancel(); |
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_lastTransitionCts = new CancellationTokenSource(); |
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@ -104,24 +279,58 @@ namespace Avalonia.Controls |
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await ContentTransition.Start(visualContent, null, forward, _lastTransitionCts.Token); |
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} |
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} |
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// Expanded/Collapsed events are invoked asynchronously to ensure other events,
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// such as Click, have time to complete first.
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Dispatcher.UIThread.Post(() => |
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{ |
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if (IsExpanded) |
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{ |
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OnExpanded(new RoutedEventArgs(ExpandedEvent, this)); |
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} |
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else |
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{ |
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OnCollapsed(new RoutedEventArgs(CollapsedEvent, this)); |
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} |
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}); |
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} |
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/// <inheritdoc/>
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protected override void OnPropertyChanged(AvaloniaPropertyChangedEventArgs change) |
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{ |
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base.OnPropertyChanged(change); |
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if (_ignorePropertyChanged) |
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{ |
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return; |
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} |
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if (change.Property == ExpandDirectionProperty) |
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{ |
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UpdatePseudoClasses(change.GetNewValue<ExpandDirection>()); |
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UpdatePseudoClasses(); |
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} |
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else if (change.Property == IsExpandedProperty) |
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{ |
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// Expanded/Collapsed will be raised once transitions are complete
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StartContentTransition(); |
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UpdatePseudoClasses(); |
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} |
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} |
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private void UpdatePseudoClasses(ExpandDirection d) |
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/// <summary>
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/// Updates the visual state of the control by applying latest PseudoClasses.
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/// </summary>
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private void UpdatePseudoClasses() |
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{ |
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PseudoClasses.Set(":up", d == ExpandDirection.Up); |
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PseudoClasses.Set(":down", d == ExpandDirection.Down); |
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PseudoClasses.Set(":left", d == ExpandDirection.Left); |
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PseudoClasses.Set(":right", d == ExpandDirection.Right); |
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var expandDirection = ExpandDirection; |
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PseudoClasses.Set(":up", expandDirection == ExpandDirection.Up); |
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PseudoClasses.Set(":down", expandDirection == ExpandDirection.Down); |
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PseudoClasses.Set(":left", expandDirection == ExpandDirection.Left); |
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PseudoClasses.Set(":right", expandDirection == ExpandDirection.Right); |
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PseudoClasses.Set(":expanded", IsExpanded); |
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} |
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} |
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} |
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Max Katz
3 years ago
GitHub