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      1 /*
      2  * Copyright (C) 2005, 2008 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "core/editing/DeleteFromTextNodeCommand.h"
     28 
     29 #include "bindings/v8/ExceptionState.h"
     30 #include "bindings/v8/ExceptionStatePlaceholder.h"
     31 #include "core/accessibility/AXObjectCache.h"
     32 #include "core/dom/Document.h"
     33 #include "core/dom/Text.h"
     34 
     35 namespace WebCore {
     36 
     37 DeleteFromTextNodeCommand::DeleteFromTextNodeCommand(PassRefPtr<Text> node, unsigned offset, unsigned count)
     38     : SimpleEditCommand(node->document())
     39     , m_node(node)
     40     , m_offset(offset)
     41     , m_count(count)
     42 {
     43     ASSERT(m_node);
     44     ASSERT(m_offset <= m_node->length());
     45     ASSERT(m_offset + m_count <= m_node->length());
     46 }
     47 
     48 void DeleteFromTextNodeCommand::doApply()
     49 {
     50     ASSERT(m_node);
     51 
     52     if (!m_node->isContentEditable(Node::UserSelectAllIsAlwaysNonEditable))
     53         return;
     54 
     55     TrackExceptionState es;
     56     m_text = m_node->substringData(m_offset, m_count, es);
     57     if (es.hadException())
     58         return;
     59 
     60     // Need to notify this before actually deleting the text
     61     if (AXObjectCache* cache = document()->existingAXObjectCache())
     62         cache->nodeTextChangeNotification(m_node.get(), AXObjectCache::AXTextDeleted, m_offset, m_text);
     63 
     64     m_node->deleteData(m_offset, m_count, es);
     65 }
     66 
     67 void DeleteFromTextNodeCommand::doUnapply()
     68 {
     69     ASSERT(m_node);
     70 
     71     if (!m_node->rendererIsEditable())
     72         return;
     73 
     74     m_node->insertData(m_offset, m_text, IGNORE_EXCEPTION);
     75 
     76     if (AXObjectCache* cache = document()->existingAXObjectCache())
     77         cache->nodeTextChangeNotification(m_node.get(), AXObjectCache::AXTextInserted, m_offset, m_text);
     78 }
     79 
     80 #ifndef NDEBUG
     81 void DeleteFromTextNodeCommand::getNodesInCommand(HashSet<Node*>& nodes)
     82 {
     83     addNodeAndDescendants(m_node.get(), nodes);
     84 }
     85 #endif
     86 
     87 } // namespace WebCore
     88