Thanks for the code, BUT... when I run it exactly as you typed it below, I get NO output lines that say seen a hint! no matter how I move the mouse and press the buttons. I get all other outputs: all button down and release and motion at r x c type messages. No hints. I am running this on a Windows box with gtk+ 2.12 installed. Stewart > -----Original Message----- > From: jcupitt@xxxxxxxxx [mailto:jcupitt@xxxxxxxxx] > Sent: Tuesday, November 27, 2007 9:30 AM > To: stewart.weiss@xxxxxxx > Cc: gtk-list@xxxxxxxxx > Subject: Re: GDK_POINTER_MOTION_HINT_MASK has no effect > > > On Nov 27, 2007 2:27 AM, Stewart Weiss <stewart.weiss@xxxxxxx> wrote: > > Does anyone know what the real semantics are, and when is_hint is true? > > Here's a complete small program that shows mouse events (with hints) > for a drawing area. > > -------------- > /* compile with > * gcc -g -Wall try32.c `pkg-config gtk+-2.0 --cflags --libs` > */ > > #include <stdio.h> > #include <gtk/gtk.h> > > static gboolean > event_cb (GtkWidget * widget, GdkEvent * ev) > { > gboolean handled; > > handled = FALSE; > > switch (ev->type) > { > case GDK_BUTTON_PRESS: > printf ("button %d press\n", ev->button.button); > handled = TRUE; > break; > > case GDK_BUTTON_RELEASE: > printf ("button %d release\n", ev->button.button); > handled = TRUE; > break; > > case GDK_MOTION_NOTIFY: > /* A hint? Read the position to get the latest value. > */ > if (ev->motion.is_hint) > { > GdkDisplay *display = gtk_widget_get_display (widget); > GdkScreen *screen; > int x_root, y_root; > > printf ("seen a hint!\n"); > > gdk_display_get_pointer (display, &screen, &x_root, > &y_root, NULL); > ev->motion.x_root = x_root; > ev->motion.y_root = y_root; > } > > printf ("motion at %g x %g\n", ev->motion.x_root, > ev->motion.y_root); > > if (ev->motion.state & GDK_BUTTON1_MASK) > printf ("(and btn1 held down)\n"); > if (ev->motion.state & GDK_BUTTON2_MASK) > printf ("(and btn2 held down)\n"); > > handled = TRUE; > > break; > > default: > break; > } > > return (handled); > } > > int > main (int argc, char **argv) > { > GtkWidget *win; > GtkWidget *area; > > gtk_init (&argc, &argv); > win = gtk_window_new (GTK_WINDOW_TOPLEVEL); > g_signal_connect (win, "destroy", G_CALLBACK (gtk_main_quit), NULL); > > area = gtk_drawing_area_new (); > gtk_widget_add_events (GTK_WIDGET (area), > GDK_POINTER_MOTION_MASK | > GDK_POINTER_MOTION_HINT_MASK | > GDK_BUTTON_PRESS_MASK | > GDK_BUTTON_RELEASE_MASK); > > gtk_signal_connect_after (GTK_OBJECT (area), "event", > GTK_SIGNAL_FUNC (event_cb), NULL); > > gtk_container_add (GTK_CONTAINER (win), area); > > gtk_window_set_default_size (GTK_WINDOW (win), 250, 250); > gtk_widget_show_all (win); > > gtk_main (); > > return (0); > } > ------------------------ > > You get output like: > > seen a hint! > motion at 1367 x 446 > seen a hint! > motion at 1368 x 446 > button 1 press > seen a hint! > motion at 1368 x 447 > (and btn1 held down) > button 2 press > seen a hint! > motion at 1368 x 448 > (and btn1 held down) > (and btn2 held down) > > John _______________________________________________ gtk-list mailing list gtk-list@xxxxxxxxx http://mail.gnome.org/mailman/listinfo/gtk-list
