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osu-lazer/osu.Game/Overlays/Settings/Sidebar.cs

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// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.
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using System;
using System.Linq;
using osu.Framework;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Containers;
using osu.Framework.Graphics.Shapes;
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using osu.Framework.Input.Events;
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using osu.Framework.Threading;
using osu.Game.Graphics;
using osu.Game.Graphics.Containers;
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using osuTK;
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namespace osu.Game.Overlays.Settings
{
public class Sidebar : Container<SidebarButton>, IStateful<ExpandedState>
{
private readonly FillFlowContainer<SidebarButton> content;
public const float DEFAULT_WIDTH = Toolbar.Toolbar.HEIGHT * 1.4f;
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public const int EXPANDED_WIDTH = 200;
public event Action<ExpandedState> StateChanged;
protected override Container<SidebarButton> Content => content;
public Sidebar()
{
RelativeSizeAxes = Axes.Y;
InternalChildren = new Drawable[]
{
new Box
{
Colour = OsuColour.Gray(0.02f),
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RelativeSizeAxes = Axes.Both,
},
new SidebarScrollContainer
{
Children = new[]
{
content = new FillFlowContainer<SidebarButton>
{
Origin = Anchor.CentreLeft,
Anchor = Anchor.CentreLeft,
AutoSizeAxes = Axes.Y,
RelativeSizeAxes = Axes.X,
Direction = FillDirection.Vertical,
}
}
},
};
}
private ScheduledDelegate expandEvent;
private ExpandedState state;
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protected override bool OnHover(HoverEvent e)
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{
queueExpandIfHovering();
return true;
}
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protected override void OnHoverLost(HoverLostEvent e)
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{
expandEvent?.Cancel();
lastHoveredButton = null;
State = ExpandedState.Contracted;
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base.OnHoverLost(e);
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}
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protected override bool OnMouseMove(MouseMoveEvent e)
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{
queueExpandIfHovering();
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return base.OnMouseMove(e);
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}
private class SidebarScrollContainer : OsuScrollContainer
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{
public SidebarScrollContainer()
{
Content.Anchor = Anchor.CentreLeft;
Content.Origin = Anchor.CentreLeft;
RelativeSizeAxes = Axes.Both;
ScrollbarVisible = false;
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}
}
public ExpandedState State
{
get => state;
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set
{
expandEvent?.Cancel();
if (state == value) return;
state = value;
switch (state)
{
default:
this.ResizeTo(new Vector2(DEFAULT_WIDTH, Height), 500, Easing.OutQuint);
break;
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case ExpandedState.Expanded:
this.ResizeTo(new Vector2(EXPANDED_WIDTH, Height), 500, Easing.OutQuint);
break;
}
StateChanged?.Invoke(State);
}
}
private Drawable lastHoveredButton;
private Drawable hoveredButton => content.Children.FirstOrDefault(c => c.IsHovered);
private void queueExpandIfHovering()
{
// only expand when we hover a different button.
if (lastHoveredButton == hoveredButton) return;
if (!IsHovered) return;
if (State != ExpandedState.Expanded)
{
expandEvent?.Cancel();
expandEvent = Scheduler.AddDelayed(() => State = ExpandedState.Expanded, 750);
}
lastHoveredButton = hoveredButton;
}
}
public enum ExpandedState
{
Contracted,
Expanded,
}
}