Fix obsolete code in sheet.c (obsolescence w.r.t. gtk-3.4)

ChangeLog

@@ -1,3 +1,6 @@
+Thu, 17 May 2012 Marc Lorber <Lorber.Marc@wanadoo.fr>
+	* Replacement of obsolete code in sheet.c: gtk_widget_get_pointer.
+	  The creplaced code is based on what has been implemented in evince.
 Sun, 13 May 2012 Marc Lorber <Lorber.Marc@wanadoo.fr>
 	* Modification of part-browser.c to fix a warning while quitting
 	  oregano

src/sheet/sheet.c

@@ -208,14 +208,36 @@ sheet_finalize (GObject *object)
 void		
 sheet_get_pointer (Sheet *sheet, gdouble *x, gdouble *y)
 {
-	GtkWidget     *widget;
-	GtkAdjustment *hadjustment;
-	GtkAdjustment *vadjustment;
-	gdouble value, x1, y1;
-	gint _x, _y;
-
-	gdk_window_get_device_position (GDK_WINDOW (sheet), GDK_SOURCE_MOUSE,
-	                                &_x, &_y, NULL);
+	GtkWidget        *widget;
+	GtkAdjustment    *hadjustment;
+	GtkAdjustment    *vadjustment;
+	gdouble           value, x1, y1;
+	gint              _x, _y;
+	GdkDeviceManager *device_manager;
+    GdkDevice        *device_pointer;
+    GdkRectangle      allocation;
+
+
+	// gtk_widget_get_pointer (GTK_WIDGET (sheet), &_x, &_y);
+	// replaced by a code copied from evince
+
+    if (!gtk_widget_get_realized (GTK_WIDGET (sheet)))
+    	return;
+
+	device_manager = gdk_display_get_device_manager (
+	                gtk_widget_get_display (GTK_WIDGET (sheet)));
+    device_pointer = gdk_device_manager_get_client_pointer (device_manager);
+    gdk_window_get_device_position (gtk_widget_get_window (GTK_WIDGET (sheet)),
+                    device_pointer,
+                    &_x, &_y, NULL);
+	if (!gtk_widget_get_has_window (GTK_WIDGET (sheet)))
+    	return;
+
+	gtk_widget_get_allocation (GTK_WIDGET (sheet), &allocation);
+
+	_x -= allocation.x;
+	_y -= allocation.y;
+
 	x1 = (gdouble) _x;
 	y1 = (gdouble) _y;