ShortcutTrigger 
  Tries to parse the given string into a trigger.
On success, the parsed trigger is returned. When parsing failed, null is returned.
The accepted strings are:
- never, for- GtkNeverTrigger
- a string parsed by gtk_accelerator_parse(), for a - GtkKeyvalTrigger, e.g.- <Control>C
- underscore, followed by a single character, for - GtkMnemonicTrigger, e.g.- _l
- two valid trigger strings, separated by a - |character, for a- GtkAlternativeTrigger:- <Control>q|<Control>w
Note that you will have to escape the < and > characters when specifying triggers in XML files, such as GtkBuilder ui files. Use `<` instead of < and `>` instead of >.
Return
a new GtkShortcutTrigger
Parameters
string
the string to parse
constructor(gtkShortcutTriggerPointer: <Error class: unknown class><<Error class: unknown class>>)(source)