/*

 * Copyright (C) 2005, 2006, 2007 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

 *    documentation and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY

 * 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

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 

 */

#include "config.h"

#include "EditCommand.h"

#include "CompositeEditCommand.h"

#include "CSSComputedStyleDeclaration.h"

#include "CSSMutableStyleDeclaration.h"

#include "DeleteButtonController.h"

#include "Document.h"

#include "Editor.h"

#include "Element.h"

#include "EventNames.h"

#include "Frame.h"

#include "SelectionController.h"

#include "VisiblePosition.h"

#include "htmlediting.h"

namespace WebCore {

EditCommand::EditCommand(Document* document) 

    : m_document(document)

    , m_parent(0)

{

    ASSERT(m_document);

    ASSERT(m_document->frame());

    setStartingSelection(avoidIntersectionWithNode(m_document->frame()->selection()->selection(), m_document->frame()->editor()->deleteButtonController()->containerElement()));

    setEndingSelection(m_startingSelection);

}

EditCommand::~EditCommand()

{

}

void EditCommand::apply()

{

    ASSERT(m_document);

    ASSERT(m_document->frame());

    Frame* frame = m_document->frame();

    if (isTopLevelCommand()) {

        if (!endingSelection().isContentRichlyEditable()) {

            switch (editingAction()) {

                case EditActionTyping:

                case EditActionPaste:

                case EditActionDrag:

                case EditActionSetWritingDirection:

                case EditActionCut:

                case EditActionUnspecified:

                    break;

                default:

                    ASSERT_NOT_REACHED();

                    return;

            }

        }

    }

    // Changes to the document may have been made since the last editing operation that 

    // require a layout, as in <rdar://problem/5658603>.  Low level operations, like 

    // RemoveNodeCommand, don't require a layout because the high level operations that 

    // use them perform one if one is necessary (like for the creation of VisiblePositions).

    if (isTopLevelCommand())

        updateLayout();

    DeleteButtonController* deleteButtonController = frame->editor()->deleteButtonController();

    deleteButtonController->disable();

    doApply();

    deleteButtonController->enable();

    if (isTopLevelCommand()) {

        // Only need to call appliedEditing for top-level commands, and TypingCommands do it on their

        // own (see TypingCommand::typingAddedToOpenCommand).

        if (!isTypingCommand())

            frame->editor()->appliedEditing(this);

    }

}

void EditCommand::unapply()

{

    ASSERT(m_document);

    ASSERT(m_document->frame());

    Frame* frame = m_document->frame();

    // Changes to the document may have been made since the last editing operation that 

    // require a layout, as in <rdar://problem/5658603>.  Low level operations, like 

    // RemoveNodeCommand, don't require a layout because the high level operations that 

    // use them perform one if one is necessary (like for the creation of VisiblePositions).

    if (isTopLevelCommand())

        updateLayout();

    DeleteButtonController* deleteButtonController = frame->editor()->deleteButtonController();

    deleteButtonController->disable();

    doUnapply();

    deleteButtonController->enable();

    if (isTopLevelCommand())

        frame->editor()->unappliedEditing(this);

}

void EditCommand::reapply()

{

    ASSERT(m_document);

    ASSERT(m_document->frame());

    Frame* frame = m_document->frame();

    // Changes to the document may have been made since the last editing operation that 

    // require a layout, as in <rdar://problem/5658603>.  Low level operations, like 

    // RemoveNodeCommand, don't require a layout because the high level operations that 

    // use them perform one if one is necessary (like for the creation of VisiblePositions).

    if (isTopLevelCommand())

        updateLayout();

    DeleteButtonController* deleteButtonController = frame->editor()->deleteButtonController();

    deleteButtonController->disable();

    doReapply();

    deleteButtonController->enable();

    if (isTopLevelCommand())

        frame->editor()->reappliedEditing(this);

}

void EditCommand::doReapply()

{

    doApply();

}

EditAction EditCommand::editingAction() const

{

    return EditActionUnspecified;

}

void EditCommand::setStartingSelection(const VisibleSelection& s)

{

    Element* root = s.rootEditableElement();

    for (EditCommand* cmd = this; ; cmd = cmd->m_parent) {

        cmd->m_startingSelection = s;

        cmd->m_startingRootEditableElement = root;

        if (!cmd->m_parent || cmd->m_parent->isFirstCommand(cmd))

            break;

    }

}

void EditCommand::setEndingSelection(const VisibleSelection &s)

{

    Element* root = s.rootEditableElement();

    for (EditCommand* cmd = this; cmd; cmd = cmd->m_parent) {

        cmd->m_endingSelection = s;

        cmd->m_endingRootEditableElement = root;

    }

}

bool EditCommand::preservesTypingStyle() const

{

    return false;

}

bool EditCommand::isInsertTextCommand() const

{

    return false;

}

bool EditCommand::isTypingCommand() const

{

    return false;

}

void EditCommand::updateLayout() const

{

    document()->updateLayoutIgnorePendingStylesheets();

}

void EditCommand::setParent(CompositeEditCommand* parent)

{

    ASSERT(parent);

    ASSERT(!m_parent);

    m_parent = parent;

    m_startingSelection = parent->m_endingSelection;

    m_endingSelection = parent->m_endingSelection;

    m_startingRootEditableElement = parent->m_endingRootEditableElement;

    m_endingRootEditableElement = parent->m_endingRootEditableElement;

}

void applyCommand(PassRefPtr<EditCommand> command)

{

    command->apply();

}

} // namespace WebCore