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On Fri, Dec 29, 2006 at 09:01:57AM +0100, Andreas Stricker wrote:
> > I try to do something that is similar to some 3D projection plan
> > window rotating/shifting function: When a key is pressed, the relative
> > mouse movement should be recorded.
> >
> > I'm primary interested if somebody solved a similar problem or got
> > an idea how to solve this.
OK, here is a rough sketch (tested). As soon as the pointer crosses the
window boundary (inward), it is grabbed (the app changes the cursor's
appearance to show it). WARNING! IT IS A TRAP! Once your pointer is
inside, you won't be let out. See to it that you have a console around
(a virtual console wth ctrl-alt-Fn will do) to kill the app. Keep out of
reach of children ;-)
+---------------------------------------------------------------- Makefile
| grab: grab.c
| gcc -Wall -g $< -o $@ \
| `pkg-config --cflags gtk+-2.0` \
| `pkg-config --libs gtk+-2.0`
+----------------------------------------------------------------
+---------------------------------------------------------------- grab.c
| /* grab.c
| test mouse grabs
| */
| #include <gtk/gtk.h>
|
| static void destroy(GtkWidget *widget, gpointer udata)
| {
| gtk_main_quit ();
| }
|
| static gboolean entered(GtkWidget *widget, GdkEventCrossing *ev, gpointer
udata)
| {
| if(ev->type == GDK_ENTER_NOTIFY) {
| GdkCursor *cursor = gdk_cursor_new(GDK_PIRATE);
| gdk_pointer_grab(widget->window, FALSE, GDK_POINTER_MOTION_MASK,
| widget->window, cursor, ev->time);
| gdk_cursor_unref(cursor); /* X has it now */
| cursor = NULL;
| }
| else { /* leaving: won't happen */
| gdk_pointer_ungrab(ev->time);
| }
| return FALSE;
| }
|
| int main(int argc, char *argv[])
| {
| GtkWidget *window;
|
| gtk_init (&argc, &argv);
|
| window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
| g_signal_connect (G_OBJECT(window), "destroy",
| G_CALLBACK(destroy), NULL);
| g_signal_connect (G_OBJECT(window), "enter-notify-event",
| G_CALLBACK(entered), NULL);
|
| gtk_widget_show_all(window);
|
|
| gtk_main ();
| /* in the current setting, this is never reached.
| We put it there to remind us to be good citizens.
| Oh well
| */
| gdk_pointer_ungrab(GDK_CURRENT_TIME);
| return 0;
| }
+----------------------------------------------------------------
Enjoy
- -- tomás
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