Introduce FrameSelection::nodeChildrenWillBeRemoved()

third_party/WebKit/Source/core/editing/FrameSelection.cpp

 /*
  * Copyright (C) 2004, 2008, 2009, 2010 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 388 matching lines @@
     if (position.anchorNode() == node)
         return true;
 
     if (!node.isElementNode())
         return false;
 
     Element& element = toElement(node);
     return element.isShadowIncludingInclusiveAncestorOf(position.anchorNode());
 }
 
+static Position computePositionForChildrenRemoval(const Position& position, ContainerNode& container)
+{
+    Node* node = position.computeContainerNode();
+    if (container.containsIncludingHostElements(*node))
+        return Position::firstPositionInNode(&container);
+    return position;
+}
+
+void FrameSelection::nodeChildrenWillBeRemoved(ContainerNode& container)
+{
+    if (isNone() || !container.inActiveDocument())
+        return;
+    const Position& oldStart = selection().start();
+    const Position& newStart = computePositionForChildrenRemoval(oldStart, container);
+    const Position& oldEnd = selection().end();
+    const Position& newEnd = computePositionForChildrenRemoval(oldEnd, container);
+    const Position& oldBase = selection().base();
+    const Position& newBase = computePositionForChildrenRemoval(oldBase, container);
+    const Position& oldExtent = selection().extent();
+    const Position& newExtent = computePositionForChildrenRemoval(oldExtent, container);
+    if (newStart == oldStart && newEnd == oldEnd && newBase == oldBase && newExtent == oldExtent)
+        return;
+    if (selection().isBaseFirst())
+        m_selectionEditor->setWithoutValidation(newStart, newEnd);
+    else
+        m_selectionEditor->setWithoutValidation(newEnd, newStart);
+    m_frameCaret->setCaretRectNeedsUpdate();
+    if (document().isRunningExecCommand())
+        return;
+    TypingCommand::closeTyping(m_frame);
+}
+
 void FrameSelection::nodeWillBeRemoved(Node& node)
 {
     // There can't be a selection inside a fragment, so if a fragment's node is being removed,
     // the selection in the document that created the fragment needs no adjustment.
     if (isNone() || !node.inActiveDocument())
         return;
 
     respondToNodeModification(node, removingNodeRemovesPosition(node, selection().base()), removingNodeRemovesPosition(node, selection().extent()),
         removingNodeRemovesPosition(node, selection().start()), removingNodeRemovesPosition(node, selection().end()));
 
@@ skipping 966 matching lines @@
 
 void showTree(const blink::FrameSelection* sel)
 {
     if (sel)
         sel->showTreeForThis();
     else
         fprintf(stderr, "Cannot showTree for (nil) FrameSelection.\n");
 }
 
 #endif