Bug 482921 part 9 - Support tooltips in the View Source window. r=gavin.sharp.

toolkit/components/viewsource/content/viewSource.js

@@ -771,3 +771,39 @@ function UpdateBackForwardCommands() {
   else
     forwardBroadcaster.setAttribute("disabled", "true");
 }
+
+// FIXME copied and modified from browser.js.
+// Deduplication is part of bug 480356.
+function FillInHTMLTooltip(tipElement)
+{
+  var retVal = false;
+  var titleText = null;
+  var direction = tipElement.ownerDocument.dir;
+
+  while (!titleText && tipElement) {
+    if (tipElement.nodeType == Node.ELEMENT_NODE) {
+      titleText = tipElement.getAttribute("title");
+      var defView = tipElement.ownerDocument.defaultView;
+      // XXX Work around bug 350679:
+      // "Tooltips can be fired in documents with no view".
+      if (!defView)
+        return retVal;
+      direction = defView.getComputedStyle(tipElement, "")
+        .getPropertyValue("direction");
+    }
+    tipElement = tipElement.parentNode;
+  }
+
+  var tipNode = document.getElementById("aHTMLTooltip");
+  tipNode.style.direction = direction;
+
+  if (titleText && /\S/.test(titleText)) {
+    // Make CRLF and CR render one line break each.  
+    titleText = titleText.replace(/\r\n/g, '\n');
+    titleText = titleText.replace(/\r/g, '\n');
+    tipNode.setAttribute("label", titleText);
+    retVal = true;
+  }
+  return retVal;
+}
+

toolkit/components/viewsource/content/viewSource.xul

@@ -141,6 +141,8 @@
 #endif
 
   </keyset>
+  
+  <tooltip id="aHTMLTooltip" onpopupshowing="return FillInHTMLTooltip(document.tooltipNode);"/>
 
   <menupopup id="viewSourceContextMenu">
     <menuitem id="context-back"
@@ -236,7 +238,7 @@
   <vbox id="appcontent" flex="1">
 
     <browser id="content" type="content-primary" name="content" src="about:blank" flex="1"
-             context="viewSourceContextMenu" showcaret="true"/>
+             context="viewSourceContextMenu" showcaret="true" tooltip="aHTMLTooltip"/>
     <findbar id="FindToolbar" browserid="content"/>
   </vbox>