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#include <gtk/gtk.h>
static void
draw_popup (GtkDrawingArea *da,
cairo_t *cr,
int width,
int height,
gpointer data)
{
cairo_set_source_rgb (cr, 1, 0, 0);
cairo_paint (cr);
}
static gboolean
place_popup (GtkEventControllerMotion *motion,
gdouble x,
gdouble y,
GtkWidget *popup)
{
gint width, height, win_x, win_y;
GtkWidget *widget;
widget = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (motion));
gtk_window_get_size (GTK_WINDOW (popup), &width, &height);
gtk_window_get_position (GTK_WINDOW (widget), &win_x, &win_y);
gtk_window_move (GTK_WINDOW (popup),
(int) win_x + x - width / 2,
(int) win_y + y - height / 2);
}
static gboolean
on_map (GtkWidget *parent)
{
GtkWidget *popup, *da;
GtkEventController *motion;
popup = gtk_window_new (GTK_WINDOW_POPUP);
da = gtk_drawing_area_new ();
gtk_drawing_area_set_draw_func (GTK_DRAWING_AREA (da), draw_popup, NULL, NULL);
gtk_container_add (GTK_CONTAINER (popup), da);
gtk_widget_set_size_request (GTK_WIDGET (popup), 20, 20);
gtk_window_set_transient_for (GTK_WINDOW (popup), GTK_WINDOW (parent));
motion = gtk_event_controller_motion_new ();
gtk_widget_add_controller (parent, motion);
g_signal_connect (motion, "motion", G_CALLBACK (place_popup), popup);
gtk_widget_show (popup);
return FALSE;
}
int
main (int argc, char *argv[])
{
GtkWidget *window;
gtk_init ();
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
g_signal_connect (window, "destroy", gtk_main_quit, NULL);
g_signal_connect (window, "map", G_CALLBACK (on_map), NULL);
gtk_widget_show (window);
gtk_main ();
return 0;
}
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