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I am new to C programming and GTK so please bear with
me. I took a C programming class in
college where my instructor would not let us create global variables in any
program we wrote. We were to create
them in the function they were used in and pass a pointer to any other
functions they were needed in. He
explained that this was good programming practice and that there were times
when global variables were useful, but not in any of the programs we were
writing. Now, three years later I have taken up C again (dusting off
the old textbooks) and am getting into GTK. I have been playing around with test
programs and need some program design advice. I have a couple widgets that when I
press a button, I want them to disappear.
However, with the g_signal_connect function, I
can’t seem to find a way to pass a pointer of each of these widgets that
I want hidden. What I end up doing
is creating a global variable for each widget that I want hidden and hiding
them with a callback function. This is how I have been doing it: For conciseness and clarity, I have left out a lot of code,
just put in the bare minimum so you can understand what I am doing. // global variables GtkWidget *box; GtkWidget *label; GtkWidget *button; int
main() { button = gtk_button_new_with_label("Click
Me"); g_signal_connect(G_OBJECT(button),
"clicked", G_CALLBACK(hide_widgets), NULL); return 0; } //function
to hide widgets void hide_widgets() { gtk_widget_hide(GTK_WIDGET(label)); gtk_widget_hide(GTK_WIDGET(button)); gtk_widget_hide(GTK_WIDGET(box)); } Is this correct, I’m pretty sure I don’t
have to make these widgets global, but I don’t know how to do it
otherwise, since the g_signal_connect can only pass
one pointer as the data argument. Can
anyone give me a little guidance here or am I too far off the path. Thanks for your time and any help you can give, Matt |