js: move position stuff to separate file

1 files changed, 31 insertions, 0 deletions

diff --git a/lib/position.js b/lib/position.js
new file mode 100644
index 000000000..29bb9a5ca
--- /dev/null
+++ b/lib/position.js
@@ -0,0 +1,31 @@
+/* http://textsnippets.com/posts/show/835 */
+
+Position.GetWindowSize = function(w) {
+        w = w ? w : window;
+        var width = w.innerWidth || (w.document.documentElement.clientWidth || w.document.body.clientWidth);
+        var height = w.innerHeight || (w.document.documentElement.clientHeight || w.document.body.clientHeight);
+        return [width, height]
+}
+
+/* http://textsnippets.com/posts/show/836 */
+
+Position.Center = function(element, parent) {
+        var w, h, pw, ph;
+        var d = Element.getDimensions(element);
+        w = d.width;
+        h = d.height;
+        Position.prepare();
+        if (!parent) {
+                var ws = Position.GetWindowSize();
+                pw = ws[0];
+                ph = ws[1];
+        } else {
+                pw = parent.offsetWidth;
+                ph = parent.offsetHeight;
+        }
+        element.style.top = (ph/2) - (h/2) -  Position.deltaY + "px";
+        element.style.left = (pw/2) - (w/2) -  Position.deltaX + "px";
+}
+
+
+