Re: Help me about this "drawable" error

[Manuel Menal <mmenal ifrance com>]

Jung-Wuk Hong wrote:

JWH> Hi

JWH> I wrote a function to write text on popup window. However it doesn't work
JWH> correctly.
JWH> I met the error drawable!=NULL.
JWH> Please help me about this problem.

JWH> In main.c, this callback is connected like this "gtk_signal_connect( button1,
JWH> "clicked", show_property, NULL);

JWH> Although I could see the button generated in this callback....

That's  a  quite common error. You cannot access to the GdkWindow of a
widget before widgets and his parents (here, vbox and property_window)
are  realized,  means  they  are  attached with a parent (except for a
window)  and  shown.  Here,  you  just  should change the order of the
lines. A function like this :

void show_property(GtkButton *but)
{
  GtkWidget *property_window;
  GtkWidget *button;
  GtkWidget *vbox, *plot_area;
  GdkFont *font;

  property_window = gtk_window_new (GTK_WINDOW_POPUP); /* make init image
window */
  gtk_window_set_position (GTK_WINDOW (property_window), GTK_WIN_POS_CENTER);
  gtk_widget_show (property_window);

  vbox = gtk_vbox_new(FALSE, NO_SPACING);
  gtk_container_add( GTK_CONTAINER( property_window ), vbox );
  gtk_widget_show (vbox);

  plot_area = gtk_drawing_area_new();
  gtk_box_pack_start( GTK_BOX(vbox), plot_area, FALSE, FALSE, NO_PADDING );
  gtk_widget_show (plot_area);

  gtk_drawing_area_size( GTK_DRAWING_AREA(plot_area), 300, 200 );

  font = gdk_font_load ("-*-helvetica-bold-r-normal-*-14-*-*-*-*-*-*-*");

  gdk_draw_text(GTK_WIDGET(plot_area)->window, font,
                GTK_WIDGET(plot_area)->style->black_gc, 10,10, "abc",15);

  button = gtk_button_new_with_label("OK");
  gtk_box_pack_start( GTK_BOX(vbox), button, FALSE, FALSE, NO_PADDING );

  gtk_widget_show (button);
}

... should avoid you this warning.

JWH> Thanks

JWH> J. Hong


[cut]


Hope it helps,



--
mmenal
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