147 lines
4.0 KiB
C#
147 lines
4.0 KiB
C#
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using System.Windows.Input;
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// ReSharper disable once CheckNamespace
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namespace WPFluent.Controls;
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/// <summary>
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/// HCWhite <see cref="System.Windows.Controls.Primitives.ScrollBar"/> with events depending on actions taken by the
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/// user.
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/// </summary>
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public class DynamicScrollBar : System.Windows.Controls.Primitives.ScrollBar
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{
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/// <summary>
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/// Identifies the <see cref="IsInteracted"/> dependency property.
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/// </summary>
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public static readonly DependencyProperty IsInteractedProperty = DependencyProperty.Register(
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nameof(IsInteracted),
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typeof(bool),
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typeof(DynamicScrollBar),
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new PropertyMetadata(false, OnIsInteractedChanged));
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/// <summary>
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/// Identifies the <see cref="IsScrolling"/> dependency property.
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/// </summary>
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public static readonly DependencyProperty IsScrollingProperty = DependencyProperty.Register(
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nameof(IsScrolling),
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typeof(bool),
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typeof(DynamicScrollBar),
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new PropertyMetadata(false, OnIsScrollingChanged));
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/// <summary>
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/// Identifies the <see cref="Timeout"/> dependency property.
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/// </summary>
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public static readonly DependencyProperty TimeoutProperty = DependencyProperty.Register(
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nameof(Timeout),
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typeof(int),
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typeof(DynamicScrollBar),
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new PropertyMetadata(1000));
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private readonly EventIdentifier _interactiveIdentifier = new();
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private bool _isInteracted = false;
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private bool _isScrolling = false;
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private static void OnIsInteractedChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
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{
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if (d is not DynamicScrollBar bar)
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{
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return;
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}
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if (bar._isInteracted == bar.IsInteracted)
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{
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return;
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}
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bar._isInteracted = !bar._isInteracted;
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bar.UpdateScrollAsync();
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}
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private static void OnIsScrollingChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
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{
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if (d is not DynamicScrollBar bar)
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{
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return;
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}
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if (bar._isScrolling == bar.IsScrolling)
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{
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return;
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}
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bar._isScrolling = !bar._isScrolling;
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bar.UpdateScrollAsync();
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}
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private async Task UpdateScrollAsync()
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{
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var currentEvent = _interactiveIdentifier.GetNext();
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var shouldScroll = IsMouseOver || _isScrolling;
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if (shouldScroll == _isInteracted)
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{
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return;
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}
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if (!shouldScroll)
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{
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await Task.Delay(Timeout);
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}
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if (!_interactiveIdentifier.IsEqual(currentEvent))
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{
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return;
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}
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SetCurrentValue(IsInteractedProperty, shouldScroll);
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}
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/// <summary>
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/// Method reporting the mouse entered this element.
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/// </summary>
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protected override void OnMouseEnter(MouseEventArgs e)
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{
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base.OnMouseEnter(e);
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UpdateScrollAsync();
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}
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/// <summary>
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/// Method reporting the mouse leaved this element.
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/// </summary>
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protected override void OnMouseLeave(MouseEventArgs e)
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{
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base.OnMouseLeave(e);
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UpdateScrollAsync();
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}
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/// <summary>
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/// Gets or sets a value indicating whether the user has taken an action related to scrolling.
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/// </summary>
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public bool IsInteracted
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{
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get => (bool)GetValue(IsInteractedProperty);
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set
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{
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if ((bool)GetValue(IsInteractedProperty) != value)
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{
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SetValue(IsInteractedProperty, value);
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}
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}
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}
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/// <summary>
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/// Gets or sets a value indicating whether the user was recently scrolling in the last few seconds.
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/// </summary>
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public bool IsScrolling { get => (bool)GetValue(IsScrollingProperty); set => SetValue(IsScrollingProperty, value); }
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/// <summary>
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/// Gets or sets additional delay after which the <see cref="DynamicScrollBar"/> should be hidden.
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/// </summary>
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public int Timeout { get => (int)GetValue(TimeoutProperty); set => SetValue(TimeoutProperty, value); }
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}
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