GTK2 -> GTK3 Upgrade GtkObjectClass

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1

Hello y’all,

I’m working on an upgrade going from GTK2 to GTK3 but I’m running into an issue where the code I’m upgrading is using GtkObjectClass and assigning its set_arg and get_arg function pointers. I can’t find an equivalent for GTK3 as the GTK2 to GTK3 article says that GtkWidgetClass should replace GtkObjectClass but GtkWidgetClass doesn’t appear to have an equivalent of get_arg and set_arg.

Is there somewhere that details this more? Should I be replacing GtkObjectClass with GObject in this case?

2

The equivalent of GtkObjectClass.set_arg() and GtkObjectClass.get_arg() are GObjectClass.set_property() and GObjectClass.get_property(), respectively. The semantics are slightly different, so you really want to read the GObject tutorial first.

3

Now that I’m using get_property() and set_property() to update fields, what would be the best way to update a GtkAdjustment field inside of a GObjectClass?

The class was previously updating horizontal adjustment and vertical adjustment fields with the get_arg() and set_arg() but set_property() and get_property() doesn’t seem like a good fit for it anymore.

4

Use gtk_adjustment_configure() to set more than one field at a time.

Or you can use g_object_set() with multiple GObject properties, e.g.

g_object_set (adjustment,
              "lower", lower_value,
              "upper", upper_value,
              "value", current_value,
              NULL);
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