Open Source Monorail

appengine/monorail/static/js/graveyard/geom.js

+/* Copyright 2016 The Chromium Authors. All Rights Reserved.
+ *
+ * Use of this source code is governed by a BSD-style
+ * license that can be found in the LICENSE file or at
+ * https://developers.google.com/open-source/licenses/bsd
+ */
+
+// functions for dealing with layout and geometry of page elements.
+// Requires shapes.js
+
+/** returns the bounding box of the given DOM node in document space.
+  *
+  * @param {Element?} obj a DOM node.
+  * @return {Rect?}
+  */
+function nodeBounds(obj) {
+  if (!obj) return null;
+
+  function fixRectForScrolling(r) {
+    // Need to take into account scrolling offset of ancestors (IE already does
+    // this)
+    for (var o = obj.offsetParent;
+         o && o.offsetParent;
+         o = o.offsetParent) {
+      if (o.scrollLeft) {
+        r.x -= o.scrollLeft;
+      }
+      if (o.scrollTop) {
+        r.y -= o.scrollTop;
+      }
+    }
+  }
+
+  var refWindow;
+  if (obj.ownerDocument && obj.ownerDocument.parentWindow) {
+    refWindow = obj.ownerDocument.parentWindow;
+  } else if (obj.ownerDocument && obj.ownerDocument.defaultView) {
+    refWindow = obj.ownerDocument.defaultView;
+  } else {
+    refWindow = window;
+  }
+
+  // IE, Mozilla 3+
+  if (obj.getBoundingClientRect) {
+    var rect = obj.getBoundingClientRect();
+
+    return new Rect(rect.left + GetScrollLeft(refWindow),
+                    rect.top + GetScrollTop(refWindow),
+                    rect.right - rect.left,
+                    rect.bottom - rect.top,
+                    refWindow);
+  }
+
+  // Mozilla < 3
+  if (obj.ownerDocument && obj.ownerDocument.getBoxObjectFor) {
+    var box = obj.ownerDocument.getBoxObjectFor(obj);
+    var r = new Rect(box.x, box.y, box.width, box.height, refWindow);
+    fixRectForScrolling(r);
+    return r;
+  }
+
+  // Fallback to recursively computing this
+  var left = 0;
+  var top = 0;
+  for (var o = obj; o.offsetParent; o = o.offsetParent) {
+    left += o.offsetLeft;
+    top += o.offsetTop;
+  }
+
+  var r = new Rect(left, top, obj.offsetWidth, obj.offsetHeight, refWindow);
+  fixRectForScrolling(r);
+  return r;
+}
+
+function GetMousePosition(e) {
+  // copied from http://www.quirksmode.org/js/events_compinfo.html
+  var posx = 0;
+  var posy = 0;
+  if (e.pageX || e.pageY) {
+    posx = e.pageX;
+    posy = e.pageY;
+  } else if (e.clientX || e.clientY) {
+    var obj = (e.target ? e.target : e.srcElement);
+    var refWindow;
+    if (obj.ownerDocument && obj.ownerDocument.parentWindow) {
+      refWindow = obj.ownerDocument.parentWindow;
+    } else {
+      refWindow = window;
+    }
+    posx = e.clientX + GetScrollLeft(refWindow);
+    posy = e.clientY + GetScrollTop(refWindow);
+  }
+  return new Point(posx, posy, window);
+}