Re: Interdependent widgets

[Paolo Costabel <paolo zebradevelopment com>]

The way to handle this is to have a function doing the update and two 
handlers with the right signature calling it.

Prewitt, Nathan C ERDC-ITL-MS Contractor wrote:

>    This is my first try developing with GTK+ and I seem to have missed what
> I think is a very basic thing after looking through the tutorial, the
> examples, and the online manual.  I am using glade to design the gui and I
> have a main application window and several other dialogs including a file
> selection dialog.  My main application window has a menu bar, a tool bar, a
> status bar, an opengl drawing area (using gtkGLExt) and a notebook that
> contains many interdependent widgets.
>
>    When a file is selected (OK is clicked), a handler catches that signal
> to open the file and read the contents.  The widgets on the main application
> widget need to be updated to reflect what was read from the file.  These
> updates including doing things like setting the ranges on sliders and
> spinners.  The problem lies partially in the fact that the file selection
> widget is separate from the main application widget.  And, since glade tries
> to keep all data private, there seems to be no easy way to identify widgets
> in the main application widget when the signal handler is called in response
> to a signal initiated by the file selection widget.
>
>    My solution was to make the main application window a global variable.
> I have a routine that sets the ranges of several widgets in the main
> application widget.  I made this routine a handler for the clicked signal
> from the OK button of the file selection widget.  I then tried to make this
> also a handler for a signal from a spinner in the main application widget so
> that I don't duplicate code (and maybe introduce bugs).  But this would
> require a different function prototype for the handler.  I would rather be
> able to cause a signal to be generated that will cause the widgets to be
> updated without there being any indication of what caused that signal.  Any
> clues?
>
> thank you
>
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