Make first-letter style to work with editing

Source/core/rendering/RenderTextFragment.cpp

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #include "config.h"
 #include "core/rendering/RenderTextFragment.h"
 
 #include "core/dom/Text.h"
+#include "core/editing/VisiblePosition.h"
+#include "core/rendering/HitTestResult.h"
 #include "core/rendering/RenderBlock.h"
 
 namespace WebCore {
 
 RenderTextFragment::RenderTextFragment(Node* node, StringImpl* str, int startOffset, int length)
     : RenderText(node, str ? str->substring(startOffset, length) : PassRefPtr<StringImpl>(0))
     , m_start(startOffset)
     , m_end(length)
     , m_firstLetter(0)
 {
 }
 
 RenderTextFragment::RenderTextFragment(Node* node, StringImpl* str)
     : RenderText(node, str)
     , m_start(0)
     , m_end(str ? str->length() : 0)
     , m_contentString(str)
     , m_firstLetter(0)
 {
 }
 
 RenderTextFragment::~RenderTextFragment()
 {
 }
 
+RenderText* RenderTextFragment::firstRenderTextInFirstLetter() const
+{
+    for (RenderObject* current = m_firstLetter; current; current = current->nextInPreOrder(m_firstLetter)) {
+        if (current->isText())
+            return toRenderText(current);
+    }
+    return 0;
+}
+
 PassRefPtr<StringImpl> RenderTextFragment::originalText() const
 {
     Node* e = node();
     RefPtr<StringImpl> result = ((e && e->isTextNode()) ? toText(e)->dataImpl() : contentString());
     if (!result)
         return 0;
     return result->substring(start(), end());
 }
 
 void RenderTextFragment::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
@@ skipping 53 matching lines @@
 {
     if (!m_firstLetter)
         return 0;
     for (RenderObject* block = m_firstLetter->parent(); block; block = block->parent()) {
         if (block->style()->hasPseudoStyle(FIRST_LETTER) && block->canHaveChildren() && block->isRenderBlock())
             return toRenderBlock(block);
     }
     return 0;
 }
 
+void RenderTextFragment::updateHitTestResult(HitTestResult& result, const LayoutPoint& point)
+{
+    if (result.innerNode())
+        return;
+
+    RenderObject::updateHitTestResult(result, point);
+    if (m_firstLetter || !node())
+        return;
+    RenderObject* nodeRenderer = node()->renderer();
+    if (!nodeRenderer || !nodeRenderer->isText() || !toRenderText(nodeRenderer)->isTextFragment())
+        return;
+
+    if (isDescendantOf(toRenderTextFragment(nodeRenderer)->m_firstLetter))
+        result.setIsFirstLetter(true);
+}
+
 } // namespace WebCore