WebFrame::selectRange and moveCaret should behave like mouse selection

Source/core/editing/VisiblePosition.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Portions Copyright (c) 2011 Motorola Mobility, 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
@@ skipping 14 matching lines @@
  */
 
 #include "config.h"
 #include "core/editing/VisiblePosition.h"
 
 #include <stdio.h>
 #include "HTMLNames.h"
 #include "core/dom/Document.h"
 #include "core/dom/Range.h"
 #include "core/dom/Text.h"
+#include "core/editing/VisibleSelection.h"
 #include "core/editing/VisibleUnits.h"
 #include "core/editing/htmlediting.h"
 #include "core/html/HTMLElement.h"
 #include "core/platform/Logging.h"
 #include "core/platform/graphics/FloatQuad.h"
+#include "core/platform/graphics/LayoutPoint.h"
 #include "core/rendering/InlineTextBox.h"
 #include "core/rendering/RenderBlock.h"
 #include "core/rendering/RootInlineBox.h"
 #include <wtf/text/CString.h>
 
 namespace WebCore {
 
 using namespace HTMLNames;
 
 VisiblePosition::VisiblePosition(const Position &pos, EAffinity affinity)
@@ skipping 686 matching lines @@
     if (visiblePosition.isNull())
         return false;
 
     if (!visiblePosition.deepEquivalent().containerNode()->isDescendantOf(node))
         return false;
 
     VisiblePosition next = visiblePosition.next();
     return next.isNull() || !next.deepEquivalent().deprecatedNode()->isDescendantOf(node);
 }
 
+VisiblePosition visiblePositionRespectingEditingBoundary(const VisibleSelection& currentSelection, const LayoutPoint& localPoint, Node* targetNode)
+{
+    LayoutPoint selectionEndPoint = localPoint;
+    Element* editableElement = currentSelection.rootEditableElement();
+
+    if (!targetNode->renderer())
+        return VisiblePosition();
+
+    if (editableElement && !editableElement->contains(targetNode)) {
+        if (!editableElement->renderer())
+            return VisiblePosition();
+
+        FloatPoint absolutePoint = targetNode->renderer()->localToAbsolute(FloatPoint(selectionEndPoint));
+        selectionEndPoint = roundedLayoutPoint(editableElement->renderer()->absoluteToLocal(absolutePoint));
+        targetNode = editableElement;
+    }
+
+    return targetNode->renderer()->positionForPoint(selectionEndPoint);
+}
+
 }  // namespace WebCore
 
 #ifndef NDEBUG
 
 void showTree(const WebCore::VisiblePosition* vpos)
 {
     if (vpos)
         vpos->showTreeForThis();
 }
 
 void showTree(const WebCore::VisiblePosition& vpos)
 {
     vpos.showTreeForThis();
 }
 
 #endif