Drag and drop, motion_notify_event, mouse coordinate shaking - c

Question

Then i start to drag an icon (code below), it starts jumping between 2 positions.
Can anybody help me resolve this shaking problem ?
Code:
#include <stdlib.h>
#include <stdio.h>
#include <gtk/gtk.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <string.h>
#define ICON_BUFFER 5
struct Icon {
GtkWidget *image;
int x,y,width,height;
};
GtkWidget *window;
GtkWidget *fixed;
struct Icon icons[ICON_BUFFER];
gboolean drag = FALSE;
static gboolean handleMove( GtkWidget *widget, GdkEventButton *event, gpointer data ){
struct Icon *icon = (struct Icon*) data;
icon->x = (int)event->x;
icon->y = (int)event->y;
gtk_fixed_move (GTK_FIXED (fixed), widget, icon->x, icon->y);
printf("move (%d , %d) %d\n", icon->x, icon->y,event->time);
return TRUE;
}
static gboolean handleRelease( GtkWidget *widget, GdkEventButton *event, gpointer data ){
g_signal_handlers_disconnect_by_func(widget, handleMove, data);
printf("%s\n", "disconnect_handleMove");
struct Icon *icon = (struct Icon*) data;
printf("position (%d , %d)\n", icon->x, icon->y);
drag = FALSE;
return TRUE;
}
static gboolean handleClick( GtkWidget *widget, GdkEventButton *event, gpointer data ){
//g_print ("Event box clicked at coordinates %f,%f\n", event->x, event->y);
struct Icon *icon = (struct Icon*) data;
if(!drag){
drag = TRUE;
printf("%s\n", "connect_handleMove");
g_signal_connect (G_OBJECT (widget), "motion_notify_event" ,G_CALLBACK(handleMove), data);
g_signal_connect (G_OBJECT (widget), "button-release-event",G_CALLBACK(handleRelease), data);
printf("position (%d , %d)\n", icon->x, icon->y);
return TRUE;
}else
return TRUE;
}
int main( int argc, char *argv[] ){
/* GtkWidget is the storage type for widgets */
GtkWidget *event;
GtkWidget *image;
GtkWidget *background;
GtkStyle *style;
GdkPixbuf *pixbuf;
gint i;
gtk_init (&argc, &argv);
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_title (GTK_WINDOW (window), "Fixed Container");
g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
gtk_container_set_border_width (GTK_CONTAINER (window), 0);
fixed = gtk_fixed_new ();
gtk_container_add (GTK_CONTAINER (window), fixed);
gtk_widget_set_size_request(fixed,480,480);
gtk_widget_show (fixed);
for (i = 0 ; i < 4 ; i++) {
event = gtk_event_box_new ();
image = gtk_image_new_from_file("test2.jpg");
icons[i].image = image;
icons[i].x = i*50;
icons[i].y = i*50;
icons[i].width = 50;
icons[i].height = 50;
gtk_container_add (GTK_CONTAINER (event), image);
gtk_fixed_put (GTK_FIXED (fixed), event, i*50, i*50);
gtk_event_box_set_above_child(GTK_EVENT_BOX(event), FALSE);
g_signal_connect (G_OBJECT (event), "button_press_event",
G_CALLBACK (handleClick), (gpointer) &icons[i]);
gtk_event_box_set_visible_window(GTK_EVENT_BOX(event),(gboolean)FALSE);
gtk_widget_show (image);
gtk_widget_show (event);
}
gtk_widget_show (window);
gtk_main ();
return 0;
}
Code can be compiled and run with (or gtk+-2.0 instead of gtk+-3.0):
cc pkg-config --cflags --libs gdk-pixbuf-2.0 gtk+-3.0 FixedDragAndDrop.c -o FixedDragAndDrop.o && ./FixedDragAndDrop.o