+// calculate total size of all children including
+// parent's padding
+int children_size(Area *a, int horizontal)
+{
+ int size = 0;
+ GSList *l;
+
+ for (l = a->list; l; l = l->next) {
+ Area *child = ((Area*)l->data);
+ if (!child->on_screen) continue;
+
+ if (horizontal)
+ size += child->width + a->paddingx;
+ else
+ size += child->height + a->paddingy;
+ }
+
+ return size;
+}
+
+
+// calculate chilren's align offset depending on the align type
+int align_offset(Area *a, int align, int horizontal)
+{
+ int size = 0;
+ int child_size = children_size(a, horizontal);
+
+ if (horizontal)
+ size = a->width;
+ else
+ size = a->height;
+
+ switch (align) {
+ case ALIGN_LEFT:
+ return 0;
+
+ case ALIGN_CENTER:
+ return (size - child_size) / 2;
+
+ case ALIGN_RIGHT:
+ return size - child_size;
+
+ default:
+ return 0;
+ }
+}
+
+