mirror of https://github.com/ppy/osu
90 lines
2.7 KiB
C#
90 lines
2.7 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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#nullable disable
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using System;
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using System.Diagnostics;
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using osu.Framework;
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using osu.Framework.Graphics;
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using osu.Framework.Graphics.Containers;
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using osu.Game.Graphics.UserInterface;
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namespace osu.Game.Graphics.Containers
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{
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/// <summary>
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/// A FillFlowContainer that provides functionality to cycle selection between children
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/// The selection wraps around when overflowing past the first or last child.
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/// </summary>
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public partial class SelectionCycleFillFlowContainer<T> : FillFlowContainer<T> where T : Drawable, IStateful<SelectionState>
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{
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public T Selected => (selectedIndex >= 0 && selectedIndex < Count) ? this[selectedIndex.Value] : null;
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private int? selectedIndex;
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public void SelectNext()
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{
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if (!selectedIndex.HasValue || selectedIndex == Count - 1)
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setSelected(0);
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else
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setSelected(selectedIndex.Value + 1);
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}
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public void SelectPrevious()
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{
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if (!selectedIndex.HasValue || selectedIndex == 0)
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setSelected(Count - 1);
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else
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setSelected(selectedIndex.Value - 1);
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}
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public void Deselect() => setSelected(null);
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public void Select(T item)
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{
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int newIndex = IndexOf(item);
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if (newIndex < 0)
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setSelected(null);
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else
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setSelected(IndexOf(item));
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}
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public override void Add(T drawable)
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{
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base.Add(drawable);
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Debug.Assert(drawable != null);
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drawable.StateChanged += state => selectionChanged(drawable, state);
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}
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public override bool Remove(T drawable, bool disposeImmediately)
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=> throw new NotSupportedException($"Cannot remove drawables from {nameof(SelectionCycleFillFlowContainer<T>)}");
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private void setSelected(int? value)
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{
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if (selectedIndex == value)
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return;
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// Deselect the previously-selected button
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if (selectedIndex.HasValue)
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this[selectedIndex.Value].State = SelectionState.NotSelected;
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selectedIndex = value;
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// Select the newly-selected button
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if (selectedIndex.HasValue)
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this[selectedIndex.Value].State = SelectionState.Selected;
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}
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private void selectionChanged(T drawable, SelectionState state)
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{
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if (state == SelectionState.NotSelected)
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Deselect();
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else
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Select(drawable);
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}
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}
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}
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