Re: drawing_area->window != NULL

["Andrés" Giraldo <andres_giraldo yahoo com>]

Thanks for your help...

Ok I've got it! The window is not realized yet, so I
put the drawing code in the expose_event function,
but...

It only works if I connect the expose event signal to
the drawing_area member, not if I connect it to the
entire structure... why?

This is using the entire structure (That's how I want
it). It doesn't work...


/*****************************************************/

typedef struct _GtkNewLabel GtkNewLabel;

struct _GtkNewLabel
  {
    GtkVBox vbox;
 
    GtkWidget *drawing_area;
  };

static void gtk_newlabel_init (GtkNewLabel *newlabel)
  {
    GtkWidget *table;

    table = gtk_table_new (1, 1, TRUE);
    gtk_container_add (GTK_CONTAINER (newlabel),
table);
    gtk_widget_show (table);

    newlabel->drawing_area = gtk_drawing_area_new ();
    gtk_table_attach_defaults (GTK_TABLE(table),
newlabel->drawing_area, 0, 1, 0, 1);

    gtk_widget_show (GTK_WIDGET (newlabel));

    gtk_signal_connect(GTK_OBJECT (newlabel),
"expose_event",
                       GTK_SIGNAL_FUNC
(on_gtk_newlabel_expose_event), &newlabel);
  }

void on_gtk_newlabel_expose_event (GtkNewLabel
*newlabel)
  {
    GdkGC *gc_back, *gc_fore;
    GdkDrawable *drawable;

    drawable = newlabel->drawing_area->window;

    gc_back = GetPen (NewColor (newlabel->back_red,
newlabel->back_green,
                                newlabel->back_blue),
drawable);
  }


GdkGC *GetPen (GdkColor *c, GdkDrawable *drawable)
  {
    GdkGC *gc;

    gc = gdk_gc_new (drawable);

    gdk_gc_set_foreground (gc, c);

    return (gc);
  }

GdkColor *NewColor (long red, long green, long blue)
  {
    GdkColor *c = (GdkColor *) g_malloc (sizeof
(GdkColor));

    c->red = red;
    c->green = green;
    c->blue = blue;

    gdk_color_alloc (gdk_colormap_get_system (), c);

    return (c);
  }

/*****************************************************/

And this is using the drawing_area member, It Works...



static void gtk_newlabel_init (GtkNewLabel *newlabel)
  {
    GtkWidget *table;

    table = gtk_table_new (1, 1, TRUE);
    gtk_container_add (GTK_CONTAINER (newlabel),
table);
    gtk_widget_show (table);

    newlabel->drawing_area = gtk_drawing_area_new ();
    gtk_table_attach_defaults (GTK_TABLE(table),
newlabel->drawing_area, 0, 1, 0, 1);

    gtk_widget_show (newlabel->drawing_area);

    gtk_signal_connect(GTK_OBJECT
(newlabel->drawing_area), "expose_event",
                       GTK_SIGNAL_FUNC
(on_gtk_newlabel_expose_event), NULL);
  }

void on_gtk_newlabel_expose_event (gpointer data)
  {
    GdkGC *gc_back, *gc_fore;
    GdkDrawable *drawable = GTK_WIDGET(data)->window;

    drawable = newlabel->drawing_area->window;

    gc_back = GetPen (NewColor (newlabel->back_red,
newlabel->back_green,
                                newlabel->back_blue),
drawable);
  }

So... what I'm doing wrong?

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