osu/osu.Game/Screens/Select/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 System;
using System.Linq;
using OpenTK.Graphics;
using OpenTK.Input;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Primitives;
using osu.Framework.Input;
using osu.Game.Graphics;
using osu.Game.Graphics.UserInterface;

namespace osu.Game.Screens.Select
{
    /// <summary>
    /// A textbox which holds focus eagerly.
    /// </summary>
    public class SearchTextBox : OsuTextBox
    {
        protected override Color4 BackgroundUnfocused => new Color4(10, 10, 10, 255);
        protected override Color4 BackgroundFocused => new Color4(10, 10, 10, 255);
        public Action Exit;

        private bool focus;
        public bool HoldFocus
        {
            get { return focus; }
            set
            {
                focus = value;
                if (!focus)
                    TriggerFocusLost();
            }
        }

        public override bool RequestingFocus => HoldFocus;

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

            PlaceholderText = "type to search";
        }

        protected override bool OnFocus(InputState state)
        {
            var result = base.OnFocus(state);
            BorderThickness = 0;
            return result;
        }

        protected override void OnFocusLost(InputState state)
        {
            if (state.Keyboard.Keys.Any(key => key == Key.Escape))
            {
                if (Text.Length > 0)
                    Text = string.Empty;
                else
                    Exit?.Invoke();
            }
            base.OnFocusLost(state);
        }

        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:
                    case Key.Enter:
                        return false;
                }
            }

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