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osu-lazer/osu.Game/Overlays/Chat/ChatRecentTextBox.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.
using System.Collections.Generic;
using osu.Framework.Input.Events;
using osu.Game.Graphics.UserInterface;
using osuTK.Input;
namespace osu.Game.Overlays.Chat
{
public class ChatRecentTextBox : FocusedTextBox
{
private readonly List<string> messageHistory = new List<string>();
private int messageIndex = -1;
private string originalMessage = string.Empty;
protected override bool OnKeyDown(KeyDownEvent e)
{
/* Behavior:
* add when on last element -> last element stays
* subtract when on first element -> sets to original text
* reset indexing when Text is set to Empty
*/
switch (e.Key)
{
case Key.Up:
if (messageIndex == -1)
originalMessage = Text;
if (messageIndex == messageHistory.Count - 1)
return true;
Text = messageHistory[++messageIndex];
return true;
case Key.Down:
if (messageIndex == -1)
return true;
if (messageIndex == 0)
{
messageIndex = -1;
Text = originalMessage;
return true;
}
Text = messageHistory[--messageIndex];
return true;
}
bool onKeyDown = base.OnKeyDown(e);
if (string.IsNullOrEmpty(Text))
messageIndex = -1;
return onKeyDown;
}
protected override void Commit()
{
if (!string.IsNullOrEmpty(Text))
messageHistory.Insert(0, Text);
messageIndex = -1;
base.Commit();
}
}
}