Interface for keyboard events.
| actionKey | Returns true if the platform specific action key is pressed. This key is Command on macOS and Control otherwise. |
| altKey | Return true if the Alt key is pressed. |
| character | The character. |
| commandKey | Return true if the Windows/Command key is pressed. |
| ctrlKey | Return true if the Control key is pressed. |
| keyCode | The key code. |
| modifiers | Flag set holding the pressed modifier keys (Alt, Control, Shift, Windows/Command). |
| shiftKey | Return true if the Shift key is pressed. |