Make first-letter style to work with editing

Source/core/rendering/RenderTextFragment.cpp

Index: Source/core/rendering/RenderTextFragment.cpp
diff --git a/Source/core/rendering/RenderTextFragment.cpp b/Source/core/rendering/RenderTextFragment.cpp
index d36e9c7f42b2c3b88fbd1f6a058e886254c16af8..a2910fae685d9f942a11d458fef70d977d5e8fbd 100644
--- a/Source/core/rendering/RenderTextFragment.cpp
+++ b/Source/core/rendering/RenderTextFragment.cpp
@@ -24,6 +24,8 @@
 #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 {
@@ -49,6 +51,22 @@ RenderTextFragment::~RenderTextFragment()
 {
 }
 
+static RenderText* findRenderText(RenderObject* renderer)
+{
+    if (renderer->isText())
+        return toRenderText(renderer);
+    for (RenderObject* current = renderer->firstChild(); current; current = current->nextSibling()) {
+        if (RenderText* found = findRenderText(current))

[tkent, 2013/08/02 03:25:48]

Using RenderObject::nextInPreOrder is preferable to recursion.

[yosin_UTC9, 2013/08/02 05:01:55]

Done.

+            return found;
+    }
+    return 0;
+}
+
+RenderText* RenderTextFragment::firstRenderTextInFirstLetter() const
+{
+    return m_firstLetter ? findRenderText(m_firstLetter) : 0;
+}
+
 PassRefPtr<StringImpl> RenderTextFragment::originalText() const
 {
     Node* e = node();
@@ -122,4 +140,20 @@ RenderBlock* RenderTextFragment::blockForAccompanyingFirstLetter() const
     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