ModAlt is the alt modifier key, or the option key on Apple keyboards.

ModCommand is the command modifier key found on Apple keyboards.

ModCtrl is the ctrl modifier key.

ModShift is the shift modifier key.

ModShortcut is the platform's shortcut modifier, usually the Ctrl key.

ModSuper is the "logo" modifier key, often represented by a Windows logo.

Names for special keys.

Press is the state of a pressed key.

Release is the state of a key that has been released.

An EditEvent is generated when text is input.

An Event is generated when a key is pressed.

A FocusEvent is generated when a handler gains or loses focus.

FocusOp sets or clears the keyboard focus.

InputOp declares a handler ready for key events.

SoftKeyboardOp shows or hide the on-screen keyboard, if available.

Modifiers.

State is the state of a key during an event.