mirror of https://github.com/ppy/osu
106 lines
3.1 KiB
C#
106 lines
3.1 KiB
C#
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
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// See the LICENCE file in the repository root for full licence text.
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using osu.Framework.Bindables;
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using osu.Framework.Graphics;
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using osu.Framework.Graphics.Containers;
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using osu.Framework.Input.Events;
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using osu.Framework.Threading;
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namespace osu.Game.Graphics.Containers
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{
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/// <summary>
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/// Represents a <see cref="Container"/> with the ability to expand/contract on hover.
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/// </summary>
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public partial class ExpandingContainer : Container, IExpandingContainer
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{
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private readonly float contractedWidth;
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private readonly float expandedWidth;
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public BindableBool Expanded { get; } = new BindableBool();
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/// <summary>
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/// Delay before the container switches to expanded state from hover.
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/// </summary>
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protected virtual double HoverExpansionDelay => 0;
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protected virtual bool ExpandOnHover => true;
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protected override Container<Drawable> Content => FillFlow;
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protected FillFlowContainer FillFlow { get; }
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protected ExpandingContainer(float contractedWidth, float expandedWidth)
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{
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this.contractedWidth = contractedWidth;
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this.expandedWidth = expandedWidth;
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RelativeSizeAxes = Axes.Y;
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Width = contractedWidth;
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InternalChild = new OsuScrollContainer
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{
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RelativeSizeAxes = Axes.Both,
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ScrollbarVisible = false,
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Child = FillFlow = new FillFlowContainer
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{
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Origin = Anchor.CentreLeft,
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Anchor = Anchor.CentreLeft,
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RelativeSizeAxes = Axes.X,
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AutoSizeAxes = Axes.Y,
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Direction = FillDirection.Vertical,
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},
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};
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}
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private ScheduledDelegate? hoverExpandEvent;
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protected override void LoadComplete()
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{
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base.LoadComplete();
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Expanded.BindValueChanged(v =>
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{
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this.ResizeWidthTo(v.NewValue ? expandedWidth : contractedWidth, 500, Easing.OutQuint);
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}, true);
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}
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protected override bool OnHover(HoverEvent e)
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{
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updateHoverExpansion();
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return true;
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}
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protected override bool OnMouseMove(MouseMoveEvent e)
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{
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updateHoverExpansion();
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return base.OnMouseMove(e);
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}
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protected override void OnHoverLost(HoverLostEvent e)
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{
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if (hoverExpandEvent != null)
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{
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hoverExpandEvent?.Cancel();
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hoverExpandEvent = null;
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Expanded.Value = false;
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return;
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}
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base.OnHoverLost(e);
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}
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private void updateHoverExpansion()
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{
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if (!ExpandOnHover)
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return;
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hoverExpandEvent?.Cancel();
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if (IsHovered && !Expanded.Value)
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hoverExpandEvent = Scheduler.AddDelayed(() => Expanded.Value = true, HoverExpansionDelay);
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}
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}
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}
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