Bug 862054 - Move translateToTopLevelWindow to Util. r=bbondy

browser/metro/base/content/Util.js

@@ -315,6 +315,30 @@ let Util = {
    * Screen and layout utilities
    */
 
+   /*
+    * translateToTopLevelWindow - Given an element potentially within
+    * a subframe, calculate the offsets up to the top level browser.
+    */
+  translateToTopLevelWindow: function translateToTopLevelWindow(aElement) {
+    let offsetX = 0;
+    let offsetY = 0;
+    let element = aElement;
+    while (element &&
+           element.ownerDocument &&
+           element.ownerDocument.defaultView != content) {
+      element = element.ownerDocument.defaultView.frameElement;
+      let rect = element.getBoundingClientRect();
+      offsetX += rect.left;
+      offsetY += rect.top;
+    }
+    let win = null;
+    if (element == aElement)
+      win = content;
+    else
+      win = element.contentDocument.defaultView;
+    return { targetWindow: win, offsetX: offsetX, offsetY: offsetY };
+  },
+
   get displayDPI() {
     delete this.displayDPI;
     return this.displayDPI = this.getWindowUtils(window).displayDPI;

browser/metro/base/content/contenthandlers/ContextMenuHandler.js

@@ -159,31 +159,6 @@ var ContextMenuHandler = {
    * Utility routines
    */
 
-   /*
-    * _translateToTopLevelWindow - Given a potential coordinate set within
-    * a subframe, translate up to the parent window which is what front
-    * end code expect.
-    */
-  _translateToTopLevelWindow: function _translateToTopLevelWindow(aPopupNode) {
-    let offsetX = 0;
-    let offsetY = 0;
-    let element = aPopupNode;
-    while (element &&
-           element.ownerDocument &&
-           element.ownerDocument.defaultView != content) {
-      element = element.ownerDocument.defaultView.frameElement;
-      let rect = element.getBoundingClientRect();
-      offsetX += rect.left;
-      offsetY += rect.top;
-    }
-    let win = null;
-    if (element == aPopupNode)
-      win = content;
-    else
-      win = element.contentDocument.defaultView;
-    return { targetWindow: win, offsetX: offsetX, offsetY: offsetY };
-  },
-
   /*
    * _processPopupNode - Generate and send a Content:ContextMenu message
    * to browser detailing the underlying content types at this.popupNode.
@@ -197,7 +172,7 @@ var ContextMenuHandler = {
     let { targetWindow: targetWindow,
           offsetX: offsetX,
           offsetY: offsetY } =
-      this._translateToTopLevelWindow(aPopupNode);
+      Util.translateToTopLevelWindow(aPopupNode);
 
     let popupNode = this.popupNode = aPopupNode;
     let imageUrl = "";