Re: Qt vs. Gtk+ holy war Was: Steps to get to GTK+ 3.0

[Xavier Bestel <xavier bestel free fr>]

On Thu, 2008-06-05 at 08:59 +0200, Jean-Yves Lefort wrote:
> Likewise, you can implement a class "Foo" containing an int property
> "bar" using the GObject way:
> 
> 	#define G_TYPE_FOO		(g_foo_get_type())
> 	#define G_FOO(obj)		(G_TYPE_CHECK_INSTANCE_CAST((obj), G_TYPE_FOO, GFoo))
> 	#define G_FOO_CLASS(class)	(G_TYPE_CHECK_CLASS_CAST((class), G_TYPE_FOO, GFooClass))
> 	#define G_IS_FOO(obj)		(G_TYPE_CHECK_INSTANE_TYPE((obj), G_TYPE_FOO))
> 	#define G_IS_FOO_CLASS(class)	(G_TYPE_CHECK_CLASS_TYPE((class), G_TYPE_FOO))
> 	#define G_FOO_GET_CLASS(obj)	(G_TYPE_INSTANCE_GET_CLASS((obj), G_TYPE_FOO, GFooClass))
> 
> 	typedef struct
> 	{
> 		GObject base;
> 	} GFoo;
> 
> 	typedef struct
> 	{
> 		GObjectClass base;
> 	} GFooClass;
> 
> 	GType g_foo_get_type (void);
> 
> 	int g_foo_get_bar (GFoo *foo);
> 	void g_foo_set_bar (GFoo *foo, int value);
> 
> 	enum {
> 		PROP_0,
> 		PROP_BAR
> 	};
> 
> 	G_DEFINE_TYPE(GFoo, g_foo, G_TYPE_OBJECT)
> 
> 	static void g_foo_get_property (GObject *object,
> 				        guint prop_id,
> 					GValue *value,
> 					GParamSpec *pspec)
> 	{
> 	  GFoo *foo = G_FOO(object);
> 
> 	  switch (prop_id)
> 	    {
> 	    case PROP_BAR:
> 	      g_value_set_int(value, g_foo_get_bar(foo));
> 	      break;
> 	    default:
> 	      G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
> 	      break;
> 	    }
> 	}
> 
> 	static void g_foo_set_property (GObject *object,
> 					guint prop_id,
> 					const GValue *value,
> 					GParamSpec *pspec)
> 	{
> 	  GFoo *foo = G_FOO(object);
> 
> 	  switch (prop_id)
> 	    {
> 	    case PROP_BAR:
> 	      g_foo_set_bar(foo, g_value_get_int(value));
> 	      break;
> 	    default:
> 	      G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
> 	      break;
> 	    }
> 	}
> 
> 	void g_foo_class_init (GFooClass *class)
> 	{
> 		GObjectClass *object_class = G_OBJECT_CLASS(foo);
> 
> 		object_class->get_property = g_foo_get_property;
> 		object_class->set_property = g_foo_set_property;
> 
> 		g_object_class_install_property(class,
> 						PROP_BAR,
> 						g_param_spec_int("bar",
> 								 NULL,
> 								 NULL,
> 								 0,
> 								 G_MAXINT,
> 								 0,
> 								 G_PARAM_READWRITE));
> 	}
> 
> 	void g_foo_init (GFoo *foo)
> 	{
> 	}
> 
> 	int g_foo_get_bar (GFoo *foo)
> 	{
> 		/* ... */
> 	}
> 
> 	void g_foo_set_bar (GFoo *foo, int value)
> 	{
> 		/* ... */
> 	}
> 
> or using the Qt way:
> 
> 	class QFoo : public QObject
> 	{
> 	   Q_OBJECT
> 
> 	   Q_PROPERTY(int bar READ bar WRITE setBar)
> 
> 	public:
> 	   void setBar (int value);
> 	   int bar () const;
> 	};
> 
> 	void QFoo::setBar (int value)
> 	{
> 		// ...
> 	}
> 
> 	int QFoo::bar ()
> 	{
> 		// ...
> 	}
> 
> Which way do you prefer?

BTW here is how it would look in Vala:

using GLib;

public class Foo : Object {
	public int bar { get; set; }
}