Source/WebCore/editing/DeleteFromTextNodeCommand.cpp

/*
 * Copyright (C) 2005, 2008 Apple Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *
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 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
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#include "config.h"
#include "DeleteFromTextNodeCommand.h"
#include "Document.h"
#include "ExceptionCodePlaceholder.h"

#include "AXObjectCache.h"
#include "Text.h"

namespace WebCore {

DeleteFromTextNodeCommand::DeleteFromTextNodeCommand(PassRefPtr<Text> node, unsigned offset, unsigned count)
    : SimpleEditCommand(node->document())
    , m_node(node)
    , m_offset(offset)
    , m_count(count)
{
    ASSERT(m_node);
    ASSERT(m_offset <= m_node->length());
    ASSERT(m_offset + m_count <= m_node->length());
}

void DeleteFromTextNodeCommand::doApply()
{
    ASSERT(m_node);

    if (!m_node->isContentEditable(Node::UserSelectAllIsAlwaysNonEditable))
        return;

    ExceptionCode ec = 0;
    m_text = m_node->substringData(m_offset, m_count, ec);
    if (ec)
        return;
    
    // Need to notify this before actually deleting the text
    if (AXObjectCache* cache = document().existingAXObjectCache())
        cache->nodeTextChangeNotification(m_node.get(), AXObjectCache::AXTextDeleted, m_offset, m_text);

    m_node->deleteData(m_offset, m_count, ec);
}

void DeleteFromTextNodeCommand::doUnapply()
{
    ASSERT(m_node);

    if (!m_node->rendererIsEditable())
        return;

    m_node->insertData(m_offset, m_text, IGNORE_EXCEPTION);

    if (AXObjectCache* cache = document().existingAXObjectCache())
        cache->nodeTextChangeNotification(m_node.get(), AXObjectCache::AXTextInserted, m_offset, m_text);
}

#ifndef NDEBUG
void DeleteFromTextNodeCommand::getNodesInCommand(HashSet<Node*>& nodes)
{
    addNodeAndDescendants(m_node.get(), nodes);
}
#endif

} // namespace WebCore