Base class for keys events with modifiers. Contains keys events information with modifiers support like [code]Shift[/code] or [code]Alt[/code]. See [method Node._input]. $DOCS_URL/tutorials/inputs/inputevent.html State of the [code]Alt[/code] modifier. State of the [code]Command[/code] modifier. State of the [code]Ctrl[/code] modifier. State of the [code]Meta[/code] modifier. State of the [code]Shift[/code] modifier.