osu-lazer/osu.Game/Graphics/UserInterface/SearchTextBox.cs

// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE

using osu.Framework.Graphics;
using osu.Framework.Input;
using OpenTK.Input;

namespace osu.Game.Graphics.UserInterface
{
    /// <summary>
    /// A textbox which holds focus eagerly.
    /// </summary>
    public class SearchTextBox : FocusedTextBox
    {
        protected virtual bool AllowCommit => false;

        public SearchTextBox()
        {
            Height = 35;
            Add(new Drawable[]
            {
                new TextAwesome
                {
                    Icon = FontAwesome.fa_search,
                    Origin = Anchor.CentreRight,
                    Anchor = Anchor.CentreRight,
                    Margin = new MarginPadding { Right = 10 },
                    TextSize = 20
                }
            });

            PlaceholderText = "type to search";
        }

        protected override bool OnKeyDown(InputState state, KeyDownEventArgs args)
        {
            if (HandlePendingText(state)) return true;

            if (!state.Keyboard.ControlPressed && !state.Keyboard.ShiftPressed)
            {
                switch (args.Key)
                {
                    case Key.Left:
                    case Key.Right:
                    case Key.Up:
                    case Key.Down:
                        return false;
                    case Key.KeypadEnter:
                    case Key.Enter:
                        if (!AllowCommit) return false;
                        break;
                }
            }

            if (state.Keyboard.ShiftPressed)
            {
                switch (args.Key)
                {
                    case Key.Delete:
                        return false;
                }
            }

            return base.OnKeyDown(state, args);
        }
    }
}