java-gnome-hackers

[java-gnome-hackers] Tree/List widgets

[Mark H. <mh...@ti...>]

hi,
I've been working on these widgets. My initial aims were to implement
the minimum methods required to get something to work. I have
implemented these and written examples/gtk/tree/TreeExample.java to
demonstrate them. 
Unfortunately, I am having trouble to get this to work. 

In order to get this far, I had to make a few changes to some glib
classes:
Type: renamed the jni ...get_STRING method to getSTRING in both the java
and c files. (This will also have to be done with the other types)

Value: Added temporary methods for assigning values to the object.

The offending line in my test app appears to be:
Value val = new Value( Type.STRING() );
and in Value:
public Value(Type type) {
		int [] vptr = new int[1];
		Value.g_value_init(vptr, type.getHandle());
		handle = vptr[0];
}

I've attached the full java output.

I don't think the iter != null assertion is relevant to this particular
error (the iter isn't involved in the value). However, it too is a
strange error. There is no way of creating a new TreeIter.
list_store_append should create and return the iter.


Also, on a different note, How do I get access to the properties of the
objects (I don't really know much c). Take GtkCellRendererText for
example; This has no get/set methods, but has many read/write
properties. I assume something has to be added to the jni files. 
-- 

+----------------------------------------------+
| Mark Howard               cam.ac.uk   mh344@ |
| http://www.tildemh.com    tildemh.com    mh@ |
+----------------------------------------------+

Re: [java-gnome-hackers] Tree/List widgets

[Mark H. <mh...@ti...>]

On Fri, 2002-08-23 at 17:46, Mark Howard wrote:
> public Value(Type type) {
> 		int [] vptr =3D new int[1];
> 		Value.g_value_init(vptr, type.getHandle());
> 		handle =3D vptr[0];
> }

Has anyone successfully used the glib.Value object?=20

The gtk reference says:
GValue*     g_value_init                    (GValue *value,
                                             GType g_type);
Initializes value with the default value of type.
value : A zero-filled (uninitialized) GValue structure.
g_type : Type the GValue should hold values of.
Returns :  <no comment>


The JNI code, however, uses the return statement:
/*
 * Class:     org.gnu.glib.Value
 * Method:    g_value_init
 * Signature: ([Lint ;I)I
 */
JNIEXPORT jint JNICALL Java_org_gnu_glib_Value_g_1value_1init (JNIEnv
*env, jclass cls,=20
    jintArray value, jint type)=20
{
    gint *value_g_g =3D (gint *) (*env)->GetIntArrayElements (env, value,
NULL);
    GValue *value_g =3D (GValue *)value_g_g;
    GType type_g =3D (GType)&type;
    {
        return (jint)g_value_init (value_g, type_g);
    }
}


Although this return value is ignored in the java code:
/**
 * Construct a new Value from a given org.gnu.glib.Value.
 */
public Value(Type type) {
	int [] vptr =3D new int[1];
	Value.g_value_init(vptr, type.getHandle());
	handle =3D vptr[0];
}

Could someone who knows more about this please check it and either
confirm that the Value code is correct or try to fix it.

Thanks
--=20

+----------------------------------------------+
| Mark Howard               cam.ac.uk   mh344@ |
| http://www.tildemh.com    tildemh.com    mh@ |
+----------------------------------------------+

Re: [java-gnome-hackers] Tree/List widgets

[Jeffrey M. <ku...@zo...>]

I will look into this over the weekend.

On Sat, 2002-08-24 at 06:00, Mark Howard wrote:
> On Fri, 2002-08-23 at 17:46, Mark Howard wrote:
> > public Value(Type type) {
> > 		int [] vptr = new int[1];
> > 		Value.g_value_init(vptr, type.getHandle());
> > 		handle = vptr[0];
> > }
> 
> Has anyone successfully used the glib.Value object? 
> 
> The gtk reference says:
> GValue*     g_value_init                    (GValue *value,
>                                              GType g_type);
> Initializes value with the default value of type.
> value : A zero-filled (uninitialized) GValue structure.
> g_type : Type the GValue should hold values of.
> Returns :  <no comment>
> 
> 
> The JNI code, however, uses the return statement:
> /*
>  * Class:     org.gnu.glib.Value
>  * Method:    g_value_init
>  * Signature: ([Lint ;I)I
>  */
> JNIEXPORT jint JNICALL Java_org_gnu_glib_Value_g_1value_1init (JNIEnv
> *env, jclass cls, 
>     jintArray value, jint type) 
> {
>     gint *value_g_g = (gint *) (*env)->GetIntArrayElements (env, value,
> NULL);
>     GValue *value_g = (GValue *)value_g_g;
>     GType type_g = (GType)&type;
>     {
>         return (jint)g_value_init (value_g, type_g);
>     }
> }
> 
> 
> Although this return value is ignored in the java code:
> /**
>  * Construct a new Value from a given org.gnu.glib.Value.
>  */
> public Value(Type type) {
> 	int [] vptr = new int[1];
> 	Value.g_value_init(vptr, type.getHandle());
> 	handle = vptr[0];
> }
> 
> Could someone who knows more about this please check it and either
> confirm that the Value code is correct or try to fix it.
> 
> Thanks
> -- 
> 
> +----------------------------------------------+
> | Mark Howard               cam.ac.uk   mh344@ |
> | http://www.tildemh.com    tildemh.com    mh@ |
> +----------------------------------------------+

Re: [java-gnome-hackers] Tree/List widgets

[Mark H. <mh...@ti...>]

On Sat, 2002-08-24 at 14:35, Jeffrey Morgan wrote:
> I will look into this over the weekend.

did you get anywhere with this?

or has anybody else got any ideas?

>=20
> On Sat, 2002-08-24 at 06:00, Mark Howard wrote:
> > On Fri, 2002-08-23 at 17:46, Mark Howard wrote:
> > > public Value(Type type) {
> > > 		int [] vptr =3D new int[1];
> > > 		Value.g_value_init(vptr, type.getHandle());
> > > 		handle =3D vptr[0];
> > > }
> >=20
> > Has anyone successfully used the glib.Value object?=20
> >=20
> > The gtk reference says:
> > GValue*     g_value_init                    (GValue *value,
> >                                              GType g_type);
> > Initializes value with the default value of type.
> > value : A zero-filled (uninitialized) GValue structure.
> > g_type : Type the GValue should hold values of.
> > Returns :  <no comment>
> >=20
> >=20
> > The JNI code, however, uses the return statement:
> > /*
> >  * Class:     org.gnu.glib.Value
> >  * Method:    g_value_init
> >  * Signature: ([Lint ;I)I
> >  */
> > JNIEXPORT jint JNICALL Java_org_gnu_glib_Value_g_1value_1init (JNIEnv
> > *env, jclass cls,=20
> >     jintArray value, jint type)=20
> > {
> >     gint *value_g_g =3D (gint *) (*env)->GetIntArrayElements (env, valu=
e,
> > NULL);
> >     GValue *value_g =3D (GValue *)value_g_g;
> >     GType type_g =3D (GType)&type;
> >     {
> >         return (jint)g_value_init (value_g, type_g);
> >     }
> > }
> >=20
> >=20
> > Although this return value is ignored in the java code:
> > /**
> >  * Construct a new Value from a given org.gnu.glib.Value.
> >  */
> > public Value(Type type) {
> > 	int [] vptr =3D new int[1];
> > 	Value.g_value_init(vptr, type.getHandle());
> > 	handle =3D vptr[0];
> > }
> >=20
> > Could someone who knows more about this please check it and either
> > confirm that the Value code is correct or try to fix it.
> >=20
> > Thanks
> > --=20

--=20

+----------------------------------------------+
| Mark Howard               cam.ac.uk   mh344@ |
| http://www.tildemh.com    tildemh.com    mh@ |
+----------------------------------------------+