MoonWorks/src/Input/Keyboard.cs

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using System;
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using System.Collections.Generic;
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using SDL2;
namespace MoonWorks.Input
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{
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public class Keyboard
{
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public bool AnyPressed { get; private set; }
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public KeyboardButton AnyPressedButton { get; private set; }
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public IntPtr State { get; private set; }
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private KeyCode[] KeyCodes;
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private KeyboardButton[] Keys { get; }
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private int numKeys;
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private static readonly char[] TextInputCharacters = new char[]
{
(char) 2, // Home
(char) 3, // End
(char) 8, // Backspace
(char) 9, // Tab
(char) 13, // Enter
(char) 127, // Delete
(char) 22 // Ctrl+V (Paste)
};
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private static readonly Dictionary<KeyCode, int> TextInputBindings = new Dictionary<KeyCode, int>()
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{
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{ KeyCode.Home, 0 },
{ KeyCode.End, 1 },
{ KeyCode.Backspace, 2 },
{ KeyCode.Tab, 3 },
{ KeyCode.Return, 4 },
{ KeyCode.Delete, 5 }
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// Ctrl+V is special!
};
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internal Keyboard()
{
SDL.SDL_GetKeyboardState(out numKeys);
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KeyCodes = Enum.GetValues<KeyCode>();
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Keys = new KeyboardButton[numKeys];
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foreach (KeyCode keycode in KeyCodes)
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{
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Keys[(int) keycode] = new KeyboardButton(this, keycode);
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}
}
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internal void Update()
{
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AnyPressed = false;
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State = SDL.SDL_GetKeyboardState(out _);
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foreach (KeyCode keycode in KeyCodes)
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{
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var button = Keys[(int) keycode];
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button.Update();
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if (button.IsPressed)
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{
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if (TextInputBindings.TryGetValue(keycode, out var textIndex))
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{
Inputs.OnTextInput(TextInputCharacters[(textIndex)]);
}
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else if (IsDown(KeyCode.LeftControl) && keycode == KeyCode.V)
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{
Inputs.OnTextInput(TextInputCharacters[6]);
}
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AnyPressed = true;
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AnyPressedButton = button;
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}
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}
}
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public bool IsPressed(KeyCode keycode)
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{
return Keys[(int) keycode].IsPressed;
}
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public bool IsHeld(KeyCode keycode)
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{
return Keys[(int) keycode].IsHeld;
}
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public bool IsDown(KeyCode keycode)
{
return Keys[(int) keycode].IsDown;
}
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public bool IsReleased(KeyCode keycode)
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{
return Keys[(int) keycode].IsReleased;
}
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public bool IsIdle(KeyCode keycode)
{
return Keys[(int) keycode].IsIdle;
}
public bool IsUp(KeyCode keycode)
{
return Keys[(int) keycode].IsUp;
}
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public KeyboardButton Button(KeyCode keycode)
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{
return Keys[(int) keycode];
}
public ButtonState ButtonState(KeyCode keycode)
{
return Keys[(int) keycode].State;
}
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}
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}