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A help event is sent when the user has requested context-sensitive help. This can either be caused by the application requesting context-sensitive help mode via ContextHelp, or (on MS Windows) by the system generating a WM_HELP message when the user pressed F1 or clicked on the query button in a dialog caption.

A help event is sent to the window that the user clicked on, and is propagated up the window hierarchy until the event is processed or there are no more event handlers. The application should call Event::GetId to check the identity of the clicked-on window, and then either show some suitable help or call Event::Skip if the identifier is unrecognised. Calling Skip is important because it allows Widgets to generate further events for ancestors of the clicked-on window. Otherwise it would be impossible to show help for container windows, since processing would stop after the first window found.

Derived from




Event table macros

To process an activate event, use these event handler macros to direct input to a member function that takes a HelpEvent argument.

evt_help(id) { | event | ... } Process a EVT_HELP event.
EVT_HELP_RANGE(id1, id2, func) Process a EVT_HELP event for a range of ids.

See also

ContextHelp, Dialog, Event handling overview



HelpEvent.new(TYPE eventType = 0,  Integer id = 0, 
              Point point)



Point get_position()

Returns the left-click position of the mouse, in screen coordinates. This allows the application to position the help appropriately.


set_position(Point pt)

Sets the left-click position of the mouse, in screen coordinates.

[This page automatically generated from the Textile source at Wed Sep 09 02:21:11 +0100 2009]