1
0
mirror of https://github.com/ppy/osu.git synced 2024-11-12 06:47:25 +08:00
osu-lazer/osu.Game/Graphics/Containers/SelectionCycleFillFlowContainer.cs

64 lines
1.9 KiB
C#
Raw Normal View History

// 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.
using osu.Framework.Graphics;
using osu.Framework.Graphics.Containers;
using osu.Game.Graphics.UserInterface;
namespace osu.Game.Graphics.Containers
{
/// <summary>
/// A FillFlowContainer that provides functionality to cycle selection between children
/// The selection wraps around when overflowing past the first or last child.
/// </summary>
public class SelectionCycleFillFlowContainer<T> : FillFlowContainer<T> where T : Drawable, ISelectable
{
2021-07-06 17:30:56 +08:00
private int? selectedIndex;
2021-07-06 17:30:56 +08:00
private void setSelected(int? value)
{
if (selectedIndex == value)
return;
// Deselect the previously-selected button
2021-07-06 17:30:56 +08:00
if (selectedIndex.HasValue)
this[selectedIndex.Value].Selected = false;
selectedIndex = value;
// Select the newly-selected button
2021-07-06 17:30:56 +08:00
if (selectedIndex.HasValue)
this[selectedIndex.Value].Selected = true;
}
public void SelectNext()
{
2021-07-06 17:30:56 +08:00
if (!selectedIndex.HasValue || selectedIndex == Count - 1)
setSelected(0);
else
2021-07-06 17:30:56 +08:00
setSelected(selectedIndex.Value + 1);
}
public void SelectPrevious()
{
2021-07-06 17:30:56 +08:00
if (!selectedIndex.HasValue || selectedIndex == 0)
setSelected(Count - 1);
else
2021-07-06 17:30:56 +08:00
setSelected(selectedIndex.Value - 1);
}
2021-07-06 17:30:56 +08:00
public void Deselect() => setSelected(null);
public void Select(T item)
{
var newIndex = IndexOf(item);
if (newIndex < 0)
setSelected(null);
else
setSelected(IndexOf(item));
}
2021-07-06 17:30:56 +08:00
public T Selected => (selectedIndex >= 0 && selectedIndex < Count) ? this[selectedIndex.Value] : null;
}
}