Simple Gtk app.

[Jose Eusebio Roza Pando <jeroza alu uah es>]

Jose Eusebio Roza Pando escribió:

> Ahh! I think i know the solution.
> The callback must return TRUE.
>             Eusebio
>
> Mark Hannah escribió:
>
> > Hi,
> >    The part about the callbacks and the signal handler
> > make sense to me, but I don't know what the
> > "gtk_widget_set[add]_events" part does?
> >
> > I have copied my program below. The problem is that
> > when a key is pressed, the callbacjk function is not
> > being run.
> >
> > I am sure I am doing something silly, I just don't
> > know what.
> >
> > -------------------------------
> > -------------------------------
> >
> > #include <gnome.h>
> >
> > static void key_press_cb(GtkWidget *widget,
> > GdkEventKey* event)
> > {
> >   // Print the keyvalue pressed.
> >   printf("A key has been pressed!\n");
> >
> >   /* prevent the default handler from being run */
> >   gtk_signal_emit_stop_by_name
> > (GTK_OBJECT(widget),"key_press_event");
> > }
> >
> > int main(int argc, char* argv[])
> > {
> >         GtkWidget *window;
> >         GtkWidget *image;
> >
> >         gtk_init(&argc, &argv);
> >
> >         // Create a new window.
> >         window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
> >
> >         // The keypress callback function.
> >
> > gtk_signal_connect(GTK_OBJECT(window),"key_press_event",GTK_SIGNAL_FUNC(key_press_cb),NULL);
> >
> >         gtk_widget_set_events(window, GDK_KEY_PRESS_MASK);
> >
> >         // Load the image from a file.
> >         image = gnome_pixmap_new_from_file("image1.jpg");
> >
> >         // Test that our image loaded ok.
> >         if (image == NULL) printf("Failed to load
> > image!\n");
> >         else printf("Loaded image!\n");
> >
> >         // Add the pixmap to the window.
> >         gtk_container_add(GTK_CONTAINER(window),image);
> >
> >         // Set the window size.
> >
> > gtk_window_set_default_size((GtkWindow*)window,100,100);
> >
> >         // Display the new window.
> >         gtk_widget_show_all(window);
> >
> >         // The main gnome loop runs forever.
> >         gtk_main();
> >
> >         return(0);
> > }
> >
> > --- Jose Eusebio Roza Pando <jeroza alu uah es> wrote:
> > > To interpret the keystrokes you can use the code
> > > shown below.
> > > I do not know the way to move the pixmap in gtk, but
> > > i know
> > > that is possible with gtkextra lib. You must create
> > > a canvas
> > > and you must insert inside a child (a pixmap for
> > > example) and
> > > move it easily.
> > >     Eusebio
> > > The code was generated by Carlos Pereira in other
> > > mail:
> > >
> > > These examples should answer your question.
> > > Carlos
> > >
> > > ------------monitor events----------------
> > > gtk_widget_set[add]_events (GTK_WIDGET (window),
> > > GDK_EXPOSURE_MASK |
> > > GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
> > > GDK_POINTER_MOTION_MASK |
> > > GDK_POINTER_MOTION_HINT_MASK |
> > > GDK_KEY_PRESS_MASK | GDK_KEY_RELEASE_MASK);
> > >
> > > --------connect-------------
> > > gtk_signal_connect(GTK_OBJECT (window),
> > > "key_press_event",
> > >
> > > GTK_SIGNAL_FUNC(app_gtk_handle_key_press), data);
> > >
> > > --------callback---------------
> > > #include <gdk/gdkkeysyms.h>
> > >
> > > gint app_gtk_handle_key_press (GtkWidget *widget,
> > > GdkEventKey *event,
> > > gpointer data)
> > > {
> > > switch (event->keyval)
> > >   {
> > >   case GDK_Escape:
> > >
> > >   case GDK_F2:
> > >
> > >   case GDK_F3:
> > >
> > >   case GDK_Page_Down:
> > >   }
> > >
> > > /* prevent the default handler from being run */
> > > gtk_signal_emit_stop_by_name
> > > (GTK_OBJECT(widget),"key_press_event");
> > >
> > > return TRUE;
> > > }
> > >
> > > Mark Hannah escribió:
> > >
> > > > Hi,
> > > >     I'm having problems writing a simple Gtk app.
> > > >
> > > > What I want to do is open a window and place a
> > > pixmap
> > > > image in the window. I would then like to use the
> > > > keyboard arrow keys to move the image around the
> > > > window.
> > > >
> > > > I can get as far as displaying thr pixmap in the
> > > > window, but I do not know how to capture and
> > > interpret
> > > > the keystrokes or move the pixmap position.
> > > >
> > > > Can anyone help?
> > > >
> > > > Many thanks,
> > > > Mark.
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