[kwlug-disc] Question Involving GTK 3 Programming in Python

[John Driezen]

On 2021-04-29 3:41 p.m., Paul Nijjar via kwlug-disc wrote:
 >
 > You have a class ScrapAppWindow. My (possibly wrong) idea would be to
 > make material_combo a class variable, rather than a variable that is
 > local to the init() function. Then it will be accessible from your
 > other functions.
 >
 > - Paul
 >
 >
Your suggestion is a good one Paul.  However I am at a total loss on how 
to implement your suggestion in Python.

I did manage to get the Plot Graph button working by passing the 
material_combo variable to the on_plot_graph_clicked method. Sample code 
follows:

def on_plot_graph_clicked(self, button, combo):
         print('"Plot Graph" Button was clicked.')

         selected_material = None

         tree_iter = combo.get_active_iter()
         if tree_iter is not None:
             model = combo.get_model()
             selected_material = model[tree_iter][0]

         if (selected_material is None) or (selected_material=="All 
Materials"):
             dialog = Gtk.MessageDialog(
                 transient_for=self,
                 flags=0,
                 message_type=Gtk.MessageType.INFO,
                 buttons=Gtk.ButtonsType.OK,
                 text="Please select a material.",
             )
             dialog.run()
             print("Plot Graph dialog closed.")
             dialog.destroy()
         else:
             print("Calling plotgraph(%s)."  % selected_material)
             plotgraph(selected_material)

I calling the on_plot_graph_clicked method using this line.

plot_button.connect("clicked", self.on_plot_graph_clicked, material_combo)

My solution works, but becomes unwieldy very quickly with multiple combo 
boxes.

John Driezen
jdriezen at sympatico.ca

On 2021-04-29 3:41 p.m., Paul Nijjar via kwlug-disc wrote:
> You have a class ScrapAppWindow. My (possibly wrong) idea would be to
> make material_combo a class variable, rather than a variable that is
> local to the init() function. Then it will be accessible from your
> other functions.
>
> - Paul
>
>