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Control keyboard key states anytime you want (Windows Forms)

/ Published in: C#
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  1. using System.Windows.Forms;
  2.  
  3. namespace DistrictEditor.DataClasses
  4. {
  5.  
  6.     /// <summary>
  7.     /// Класс состояний клавиатуры
  8.     /// </summary>
  9.     public class Keyboard
  10.     {
  11.         /// <summary>
  12.         /// Нажата ли клавиша Ctrl
  13.         /// </summary>
  14.         public bool IsCtrlPressed { get; private set; }
  15.  
  16.         /// <summary>
  17.         /// Нажата ли клавиша Alt
  18.         /// </summary>
  19.         public bool IsAltPressed { get; private set; }
  20.  
  21.         /// <summary>
  22.         /// Конструктор. Принимает экземпляр  формы,
  23.         /// на которой нам необходимо мониторить нажатия
  24.         /// </summary>
  25.         /// <param name="form">Экземпляр формы</param>
  26.         public Keyboard(Form form)
  27.         {
  28.             if (form != null)
  29.             {
  30.                 form.KeyDown += FormKeyDown;
  31.                 form.KeyUp += FormKeyUp;
  32.             }
  33.         }
  34.  
  35.         /// <summary>
  36.         /// Вызывается при отпускании клавиши
  37.         /// </summary>
  38.         /// <param name="sender"></param>
  39.         /// <param name="e"></param>
  40.         private void FormKeyUp(object sender, KeyEventArgs e)
  41.         {
  42.             IsCtrlPressed = IsCtrlPressed ? false : IsCtrlPressed;
  43.             IsAltPressed = IsAltPressed ? false: IsAltPressed;
  44.         }
  45.  
  46.         /// <summary>
  47.         /// Вызывается при нажатии клавиши
  48.         /// </summary>
  49.         /// <param name="sender"></param>
  50.         /// <param name="e"></param>
  51.         private void FormKeyDown(object sender, KeyEventArgs e)
  52.         {
  53.             IsCtrlPressed = e.Control;
  54.             IsAltPressed = e.Alt;
  55.         }
  56.  
  57.     }
  58.  
  59. }

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