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#include <gtk/gtk.h>
static gboolean
draw_popup (GtkWidget *widget,
cairo_t *cr,
gpointer data)
{
cairo_set_source_rgb (cr, 1, 0, 0);
cairo_paint (cr);
return FALSE;
}
static gboolean
place_popup (GtkWidget *parent,
GdkEvent *event,
GtkWidget *popup)
{
GdkEventMotion *ev_motion = (GdkEventMotion *) event;
gint width, height;
gtk_window_get_size (GTK_WINDOW (popup), &width, &height);
gtk_window_move (GTK_WINDOW (popup),
(int) ev_motion->x_root - width / 2,
(int) ev_motion->y_root - height / 2);
return FALSE;
}
static gboolean
on_map_event (GtkWidget *parent,
GdkEvent *event,
gpointer data)
{
GtkWidget *popup;
popup = gtk_window_new (GTK_WINDOW_POPUP);
gtk_widget_set_size_request (GTK_WIDGET (popup), 20, 20);
gtk_widget_set_app_paintable (GTK_WIDGET (popup), TRUE);
gtk_window_set_transient_for (GTK_WINDOW (popup), GTK_WINDOW (parent));
g_signal_connect (popup, "draw", G_CALLBACK (draw_popup), NULL);
g_signal_connect (parent, "motion-notify-event", G_CALLBACK (place_popup), popup);
gtk_widget_show (popup);
return FALSE;
}
int
main (int argc, char *argv[])
{
GtkWidget *window;
gtk_init (&argc, &argv);
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_widget_set_events (window, GDK_POINTER_MOTION_MASK);
g_signal_connect (window, "destroy", gtk_main_quit, NULL);
g_signal_connect (window, "map-event", G_CALLBACK (on_map_event), NULL);
gtk_widget_show (window);
gtk_main ();
return 0;
}
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