1 files changed, 114 insertions, 0 deletions
diff --git a/mailnews/base/prefs/content/am-prefs.js b/mailnews/base/prefs/content/am-prefs.js
new file mode 100644
index 000000000..6f88af016
--- /dev/null
+++ b/mailnews/base/prefs/content/am-prefs.js
@@ -0,0 +1,114 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* functions for disabling front end elements when the appropriate
+   back-end preference is locked. */
+
+Components.utils.import("resource://gre/modules/Services.jsm");
+
+/**
+ * Prefs in MailNews require dynamic portions to indicate
+ * which of multiple servers or identities. This function
+ * takes a string and a xul element.
+ *
+ * @param aStr  The string is a prefstring with a token %tokenname%.
+ * @param aElement  The xul element has an attribute of name |tokenname|
+ *                  whose value is substituted into the string and returned
+ *                  by the function.
+ *
+ * Any tokens which do not have associated attribute value
+ * are not substituted, and left in the string as-is.
+ */
+function substPrefTokens(aStr, aElement)
+{
+  let tokenpat = /%(\w+)%/;
+  let token;
+  let newprefstr = "";
+
+  let prefPartsArray = aStr.split(".");
+  /* here's a little loop that goes through
+     each part of the string separated by a dot, and
+     if any parts are of the form %string%, it will replace
+     them with the value of the attribute of that name from
+     the xul object */
+  for (let i = 0; i < prefPartsArray.length; i++) {
+    token = prefPartsArray[i].match(tokenpat);
+    if (token) { /* we've got a %% match */
+      if (token[1]) {
+        if (aElement[token[1]]) {
+          newprefstr += aElement[token[1]] + "."; // here's where we get the info
+        } else { /* all we got was this stinkin % */
+          newprefstr += prefPartsArray[i] + ".";
+        }
+      }
+    } else /* if (token) */ {
+      newprefstr += prefPartsArray[i] + ".";
+    }
+  }
+  newprefstr = newprefstr.slice(0, -1); // remove the last char, a dot
+  if (newprefstr.length <= 0)
+    newprefstr = null;
+
+  return newprefstr;
+}
+
+/**
+ * A simple function to check if a pref in an element is locked.
+ *
+ * @param aElement  a xul element with the pref related attributes
+ *                 (pref, preftype, prefstring)
+ * @return  whether the prefstring specified in that element is
+ *          locked (true/false).
+ *          If it does not have a valid prefstring, a false is returned.
+ */
+function getAccountValueIsLocked(aElement)
+{
+  let prefstring = aElement.getAttribute("prefstring");
+  if (prefstring) {
+    let prefstr = substPrefTokens(prefstring, aElement);
+    // see if the prefstring is locked
+    if (prefstr)
+      return Services.prefs.prefIsLocked(prefstr);
+  }
+  return false;
+}
+
+/**
+ * Enables/disables element (slave) according to the checked state
+ * of another elements (masters).
+ *
+ * @param aChangeElementId  Slave element which should be enabled
+ *                          if all the checkElementIDs are checked.
+ *                          Otherwise it gets disabled.
+ * @param aCheckElementIds  An array of IDs of the master elements.
+ *
+ * See bug 728681 for the pattern on how this is used.
+ */
+function onCheckItem(aChangeElementId, aCheckElementIds)
+{
+  let elementToControl = document.getElementById(aChangeElementId);
+  let disabled = false;
+
+  for (let notifyId of aCheckElementIds) {
+    let notifyElement = document.getElementById(notifyId);
+    let notifyElementState = null;
+    if ("checked" in notifyElement)
+      notifyElementState = notifyElement.checked;
+    else if ("selected" in notifyElement)
+      notifyElementState = notifyElement.selected;
+    else
+      Components.utils.reportError("Unknown type of control element: " + notifyElement.id);
+
+    if (!notifyElementState) {
+      disabled = true;
+      break;
+    }
+  }
+
+  if (!disabled && getAccountValueIsLocked(elementToControl))
+    disabled = true;
+
+  elementToControl.disabled = disabled;
+}