Port ParentNode API to ElementTraversal

Source/core/editing/TypingCommand.cpp

 /*
  * Copyright (C) 2005, 2006, 2007, 2008 Apple Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 11 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/editing/TypingCommand.h"
 
 #include "HTMLNames.h"
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
+#include "core/dom/ElementTraversal.h"
 #include "core/editing/BreakBlockquoteCommand.h"
 #include "core/editing/Editor.h"
 #include "core/editing/FrameSelection.h"
 #include "core/editing/InsertLineBreakCommand.h"
 #include "core/editing/InsertParagraphSeparatorCommand.h"
 #include "core/editing/InsertTextCommand.h"
 #include "core/editing/SpellChecker.h"
 #include "core/editing/VisiblePosition.h"
 #include "core/editing/VisibleUnits.h"
 #include "core/editing/htmlediting.h"
@@ skipping 332 matching lines @@
     applyCommandToComposite(BreakBlockquoteCommand::create(document()));
     typingAddedToOpenCommand(InsertParagraphSeparatorInQuotedContent);
 }
 
 bool TypingCommand::makeEditableRootEmpty()
 {
     Element* root = endingSelection().rootEditableElement();
     if (!root || !root->firstChild())
         return false;
 
-    if (root->firstChild() == root->lastChild() && root->firstElementChild() && root->firstElementChild()->hasTagName(brTag)) {
-        // If there is a single child and it could be a placeholder, leave it alone.
-        if (root->renderer() && root->renderer()->isRenderBlockFlow())
-            return false;
+    if (root->firstChild() == root->lastChild()) {
+        Element* firstElementChild = ElementTraversal::firstWithin(*root);
+        if (firstElementChild && firstElementChild->hasTagName(brTag)) {
+            // If there is a single child and it could be a placeholder, leave it alone.
+            if (root->renderer() && root->renderer()->isRenderBlockFlow())
+                return false;
+        }
     }
 
     while (Node* child = root->firstChild())
         removeNode(child);
 
     addBlockPlaceholderIfNeeded(root);
     setEndingSelection(VisibleSelection(firstPositionInNode(root), DOWNSTREAM, endingSelection().isDirectional()));
 
     return true;
 }
@@ skipping 216 matching lines @@
     ASSERT_NOT_REACHED();
     m_preservesTypingStyle = false;
 }
 
 bool TypingCommand::isTypingCommand() const
 {
     return true;
 }
 
 } // namespace WebCore