On Thu, 2008-06-12 at 11:12 +0200, Kees Scherpenhuijzen wrote:
> 2008/6/12, James Scott Jr <[EMAIL PROTECTED]>:
> > Kees,
> >
> > I cannot seem figure out what your trying to do. The code I see in the
> > notes is not something I understand; and I am an experienced gtk
> > developer.
> >
> > Please back away from the code for a minute and try to describe what it
> > is your trying to achieve with this interface or application that
> > spawned this series of notes. I'm hoping you just started off
> > completely wrong with the wrong assumptions about how to achieve your
> > goal. In which case I/we can put you back on track. But for now I
> > cannot keep up.
> >
> > Why do I say this?
> > 1. "i trying to make an object inherited from GTK_ACTION, this all is
> > managed."
> > Response:
> > * If you want to inherit from GTK_ACTION you make a completely new
> > widget. Look for info on writing widgets from scratch.
> >
> > * Wrapping a function around a g_object_new as you have done in both
> > examples is miss-leading at best. You cannot make an existing
> > gtk_object do something it was not designed to; i.e. add a struct in its
> > object_new() parms. You can g_object_set|get_data() on an existing
> > object; register a function for signal from an object so you can modify
> > its external behaviour, on and on...
> >
> > Ok. Back to "tell me what your trying to do?"
> >
> > James,
> >
> >
> >
> >
> > On Wed, 2008-06-11 at 23:54 +0200, Kees Scherpenhuijzen wrote:
> > > 2008/5/14 Kees Scherpenhuijzen <[EMAIL PROTECTED]>:
> > > > heyy,
> > > >
> > > > @ the moment i trying to make an object inherited from GTK_ACTION,
> > > > this all is managed.
> > > > Only now i'm trying to initialize the object with an variable, a
> > > > struct. Ie read the manual about the wrapper that is used, only i
> > > > can't seem
> > > > to find a way in which i can add the struct to g_object_new or
> > > > otherwise.
> > > >
> > > > to be clear, in this function:
> > > > GtkAction*
> > > > menu_action_new (const gchar *name,
> > > > const gchar *label)
> > > > {
> > > > GtkAction* action;
> > > > _thunar_return_val_if_fail (name != NULL, NULL);
> > > > _thunar_return_val_if_fail (label != NULL, NULL);
> > > >
> > > > action = g_object_new (MENU_TYPE_ACTION,
> > > > "hide-if-empty", FALSE,
> > > > "label", label,
> > > > "name", name,
> > > > NULL);
> > > > return action;
> > > > }
> > > >
> > > > i want to add the struct so i don't need any get of set functions, is
> > > > this possible?
> > > >
> > > > the thing i want to do is to init :
> > > > menu_thing *item;
> > > > in:
> > > > struct _MenuTemplatesAction
> > > > {
> > > > GtkAction __parent__;
> > > > menu_thing *item;
> > > > };
> > > >
> > > > I hope this enough info to get me close to an answer
> > > >
> > > >
> > > > --
> > > > Kees
> > > >
> > >
> > > Hi,
> > >
> > > I've saw some examples about this problem and tried it with no luck. i
> > > saw that the object was cast and just added.
> > > i've tried:
> > > GtkAction*
> > > menu_action_new (const gchar *name,
> > > const gchar *label,
> > > Model *model)
> > > {
> > > GtkAction* action;
> > > _thunar_return_val_if_fail (name != NULL, NULL);
> > > _thunar_return_val_if_fail (label != NULL, NULL);
> > >
> > > action = g_object_new (MENU_TYPE_ACTION,
> > > "hide-if-empty", FALSE,
> > > "label", label,
> > > "name", name,
> > > NULL);
> > >
> > > MENU_ACTION(action)->items = model;
> > >
> > > if(G_TYPE_FUNDAMENTAL (action) == G_TYPE_OBJECT)
> > > {
> > > g_message(model->menu->name);
> > > g_message(action->items);
> > > g_message("test");
> > > }
> > > return action;
> > > }
> > > but it seems the second g_message won't print, it gives an segmentation
> > > fault.
> > >
> > > extra info: #define MENU_ACTION(obj)
> > > (G_TYPE_CHECK_INSTANCE_CAST ((obj), MENU_TYPE_ACTION,
> > > MenuTemplatesAction))
> > >
> > > What am i missing here?
> > >
> > > Thanks in advance
> > >
> >
> >
> Hey,
>
> I'm sorry if i'm not clear enough. maybe it's my english :P.
>
> But to make everything clear:
> I'm trying to make a widget which can make menuitems out of a struct.
> The struct isn't thought out so i'm not getting to deep in that.
> The template i'm rewriting is found @
> http://svn.xfce.org/svn/xfce/thunar/trunk/thunar/thunar-templates-action.c
>
> What i'm trying to is when the action is created, I wan't to
> initialize the object with a variable, so when the object is
> shown(thunar_templates_action_menu_shown is used) the variable(struct)
> is initialized.
>
> I hope this clears the situation a bit.
>
> And thanks for the help
Kees,
Your English is fine. It was really the code throwing me off.
I will try to answer some of the memory related questions first.
Assuming you want to add a pointer, to a gtk_action object, of an
allocated memory structure containing instance data; there are two ways
I can thing of getting that done before writing my own widget -- which
makes all things possible.
1. Create the gtk_action first then append a user-data pointer to the
object with g_object_set_data() or g_object_set_data_full(). The full
varient frees the allocated memory when the object is destroyed.
2. Most certainly we will connect a routine to the "activate" signal of
the gtk_action object. When we connect the signal attach a pointer to
our user-data to the signal using g_object_connect();
typedef struct _your_struct {
gchar my_string[50];
GtkWidget *my_widget;
gpointer reserved;
} your_struct;
typedef your_struct *ptr_your_struct;
object = gtk_action_new();
gpointer gptr_your_struct = g_new0(your_struct,1);
Item 1.
g_object_set_data(object,"any-but-same-label", gptr_your_struct)
...
gptr_your_struct = g_object_get_data(object,"any-but-same-label")
Item 2.
g_object_connect(object, "activate",fn_handler, gptr_your_struct, NULL);
...
void fn_handler(GtkAction *action, gpointer user_data)
{
gptr_your_struct pData = NULL;
pData = (gptr_your_struct)user_data;
...
g_message ("My data is %s", pData->my_string);
...
}
These methods work. Now if the above is not enough functionality then
you will be creating your own true Widget. For that all I can say is
"Creating a GTK widget from scratch" is already will documented.
However, look over the tools gtk-demo (its likely already installed),
and devhelp (local api documentation).
Why the segfault? I need to see more code before I can say definitively
- but it seems your approach to menu_action_new() is incorrect, as is
your attempt at creating a widget. There is more code and structure to
creating a widget. The one or two routines you posted is not enough for
me (maybe someone else). I think the whole (widget) thing with the
header will be needed, please post more code so I can see the structure
of the whole widget.
Here is a hint: menu_action_new(0 should create a menu_action object
first! then inside the class init routine create any supporting objects,
like the gtk_action.
James,
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