Source/WebCore/editing/MoveSelectionCommand.cpp

/*
 * Copyright (C) 2005, 2006 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
 * are met:
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 *    documentation and/or other materials provided with the distribution.
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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#include "config.h"
#include "MoveSelectionCommand.h"

#include "DeleteSelectionCommand.h"
#include "DocumentFragment.h"
#include "ReplaceSelectionCommand.h"

namespace WebCore {

MoveSelectionCommand::MoveSelectionCommand(Ref<DocumentFragment>&& fragment, const Position& position, bool smartInsert, bool smartDelete)
    : CompositeEditCommand(position.anchorNode()->document())
    , m_fragment(WTFMove(fragment))
    , m_position(position)
    , m_smartInsert(smartInsert)
    , m_smartDelete(smartDelete)
{
}

void MoveSelectionCommand::doApply()
{
    ASSERT(endingSelection().isNonOrphanedRange());

    Position pos = m_position;
    if (pos.isNull())
        return;

    // Update the position otherwise it may become invalid after the selection is deleted.
    Position selectionEnd = endingSelection().end();
    if (pos.anchorType() == Position::PositionIsOffsetInAnchor && selectionEnd.anchorType() == Position::PositionIsOffsetInAnchor
        && selectionEnd.containerNode() == pos.containerNode() && selectionEnd.offsetInContainerNode() < pos.offsetInContainerNode()) {
        pos.moveToOffset(pos.offsetInContainerNode() - selectionEnd.offsetInContainerNode());

        Position selectionStart = endingSelection().start();
        if (selectionStart.anchorType() == Position::PositionIsOffsetInAnchor && selectionStart.containerNode() == pos.containerNode())
            pos.moveToOffset(pos.offsetInContainerNode() + selectionStart.offsetInContainerNode());
    }

    {
        auto deleteSelection = DeleteSelectionCommand::create(document(), m_smartDelete, true, false, true, true, EditActionDeleteByDrag);
        deleteSelection->setParent(this);
        deleteSelection->apply();
        m_commands.append(WTFMove(deleteSelection));
    }

    // If the node for the destination has been removed as a result of the deletion,
    // set the destination to the ending point after the deletion.
    // Fixes: <rdar://problem/3910425> REGRESSION (Mail): Crash in ReplaceSelectionCommand; 
    //        selection is empty, leading to null deref
    if (!pos.anchorNode()->isConnected())
        pos = endingSelection().start();

    cleanupAfterDeletion(pos);

    setEndingSelection(VisibleSelection(pos, endingSelection().affinity(), endingSelection().isDirectional()));
    setStartingSelection(endingSelection());
    if (!pos.anchorNode()->isConnected()) {
        // Document was modified out from under us.
        return;
    }
    ReplaceSelectionCommand::CommandOptions options = ReplaceSelectionCommand::SelectReplacement | ReplaceSelectionCommand::PreventNesting;
    if (m_smartInsert)
        options |= ReplaceSelectionCommand::SmartReplace;

    {
        auto replaceSelection = ReplaceSelectionCommand::create(document(), WTFMove(m_fragment), options, EditActionInsertFromDrop);
        replaceSelection->setParent(this);
        replaceSelection->apply();
        m_commands.append(WTFMove(replaceSelection));
    }
}

EditAction MoveSelectionCommand::editingAction() const
{
    return EditActionDeleteByDrag;
}

} // namespace WebCore