xtd - Reference Guide  0.1.0
Modern c++17 framework to create console, gui and unit test applications on Windows, macOS and Linux.

§ help_event_handler

template<typename type_t >
using xtd::forms::help_event_handler = typedef delegate<void(type_t sender, help_event_args& e)>

Represents the method that will handle the help_requested event of a control.

senderThe source of the event.
eA help_event_args that contains the event data.
When you create a help_event_handler delegate, you identify the method that will handle the event. To associate the event with your event handler, add an instance of the delegate to the event. The event handler is called whenever the event occurs, unless you remove the delegate.