Issue 2816 - Partial fix for EHH button in inspector tool, preview functionality still broken

chrome/content/actor.jsm

Index: chrome/content/actor.jsm
===================================================================
new file mode 100644
--- /dev/null
+++ b/chrome/content/actor.jsm
@@ -0,0 +1,110 @@
+/*
+ * This Source Code is subject to the terms of the Mozilla Public License
+ * version 2.0 (the "License"). You can obtain a copy of the License at
+ * http://mozilla.org/MPL/2.0/.
+ */
+
+let EXPORTED_SYMBOLS = ["shutdown", "getNodeInfo"];
+
+const Ci = Components.interfaces;
+const Cu = Components.utils;
+
+let {console} = Cu.import("resource://gre/modules/devtools/Console.jsm", {});
+let {DebuggerServer} = Cu.import("resource://gre/modules/devtools/dbg-server.jsm", {});
+let name = "elemhidehelper";
+let actor = {
+  constructorFun: Actor,
+  constructorName: name,
+  name: name
+};
+
+DebuggerServer.addTabActor(actor, name);
+
+let shutdown = (function()
+{
+  let executed = false;
+  return function()
+  {
+    if (!executed)
+      DebuggerServer.removeTabActor(actor);
+    executed = true;
+  }
+})();
+
+function Actor(connection, tabActor)
+{
+}
+
+Actor.prototype = {
+  requestTypes: {
+    nodeinfo: function(request, connection)
+    {
+      let nodeActor = connection.getActor(request.nodeActor);
+      if (!nodeActor || !nodeActor.rawNode ||
+          nodeActor.rawNode.nodeType != Ci.nsIDOMNode.ELEMENT_NODE)
+      {
+        return {};
+      }
+
+      return getNodeInfo(nodeActor.rawNode);
+    }
+  }
+};
+
+function getNodeInfo(node)
+{
+  return {
+    host: node.ownerDocument.defaultView.location.hostname,
+    nodeData: getNodeData(node)
+  };
+}
+
+function getNodeData(node, parentNode)
+{
+  if (!node)
+    return null;
+
+  let result = {};
+  result.tagName = {value: node.tagName, checked: false};
+
+  if (typeof parentNode != "undefined")
+    result.parentNode = parentNode;
+  else
+    result.parentNode = getNodeData(node.parentElement);
+
+  let prevSibling = node.previousElementSibling;
+  result.prevSibling = getNodeData(prevSibling, result.parentNode);
+
+  if (result.parentNode && !prevSibling)
+    result.firstChild = {checked: false};
+
+  let nextSibling = node.nextElementSibling;
+  if (result.parentNode && !nextSibling)
+    result.lastChild = {checked: false};
+
+  result.attributes = [];
+  for (let attribute of node.attributes)
+  {
+    let data = {
+      name: attribute.name,
+      value: attribute.value,
+      selected: attribute.value,
+      checked: false
+    };
+    if (data.name == "id" || data.name == "class")
+      result.attributes.unshift(data);
+    else
+      result.attributes.push(data);
+  }
+
+  if (result.attributes.length >= 2 && result.attributes[1].name == "id")
+  {
+    // Make sure ID attribute comes first
+    let tmp = result.attributes[1];
+    result.attributes[1] = result.attributes[0];
+    result.attributes[0] = tmp;
+  }
+
+  result.customCSS = {selected: "", checked: false};
+  return result;
+}