From: Luc Chante <luc.cha...@gmail.com>
Sent: Monday, 27 June 2016, 11:36
Subject: Re: [Vala] getting started with vala and glade
I think it would be a good start to use gtk templates.
So you can use your ui file and create the ApplicationWindow by it's
constructor (which takes an Application instance).
Join to this mail a really simple example using ui file and gtk templates.
Tested with msys 2.
This is a great start for a code sample on the wiki,
maybe:https://wiki.gnome.org/Projects/Vala/GTKTemplateSample
As a code sample I have a couple of doubts about the current coding style:
- I think the main() method should be on its own, not buried in an object
- For setting properties on the parent in a constructor what is wrong with
this.property_name = xyz; instead of using Vala specific GObject plumbing
like Object( property_name: value ); Although these low level GObject features
exist they add additional complexity when
initially learning the language and are unnecessary in most cases
So a revised main.vala:
/**
* Application
*/
public class MyApplication : Gtk.Application
{
public MyApplication(string? app_id = null, ApplicationFlags flags =
ApplicationFlags.FLAGS_NONE)
{
if (app_id != null && Application.id_is_valid (app_id) == false) {
error( "Application ID is not valid");
}
this.application_id = app_id;
this.flags = flags;
}
public override void activate () {
var window = new Template.ApplicationWindow (this);
window.present ();
}
}
/**
* Application window
*/
[GtkTemplate(ui = "/template/window.ui")]
public class Template.ApplicationWindow : Gtk.ApplicationWindow
{
[GtkChild]
Gtk.Button test_button;
public ApplicationWindow(Gtk.Application application)
{
this.application = application;
}
[GtkCallback]
public void on_test_button_clicked(Gtk.Button button)
{
GLib.message("Button clicked !!!");
}
}
/** Application entry point */
public static int main(string[] args)
{
var app = new MyApplication ("my.application");
return app.run (args);
}
Finally as a more generic way to compile use:
glib-compile-resources --sourcedir ./ --generate-source --target resources.c
template.gresource.xmlvalac --pkg gtk+-3.0 --target-glib 2.38 --gresources
template.gresource.xml resources.c main.vala --output myapp
The Makefile is nice though.
Regards,
Al
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