Source/WebCore/editing/DeleteButtonController.h

/*
 * Copyright (C) 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. 
 */

#ifndef DeleteButtonController_h
#define DeleteButtonController_h

#if ENABLE(DELETION_UI)

#include "DeleteButton.h"
#include "Editor.h"
#include "Frame.h"

namespace WebCore {

class DeleteButton;
class HTMLElement;
class RenderObject;
class VisibleSelection;

class DeleteButtonController {
    WTF_MAKE_NONCOPYABLE(DeleteButtonController); WTF_MAKE_FAST_ALLOCATED;
public:
    explicit DeleteButtonController(Frame*);

    HTMLElement* containerElement() const { return m_containerElement.get(); }

    void respondToChangedSelection(const VisibleSelection& oldSelection);

    void deviceScaleFactorChanged();

    void show(HTMLElement*);
    void hide();

    void deleteTarget();

private:
    static const char* const buttonElementIdentifier;
    static const char* const outlineElementIdentifier;
    static const char* const containerElementIdentifier;
    
    void enable();
    void disable();
    friend class DeleteButtonControllerDisableScope;

    void createDeletionUI();
    bool enabled() const { return (!m_disableStack); }

    Frame* m_frame;
    RefPtr<HTMLElement> m_target;
    RefPtr<HTMLElement> m_containerElement;
    RefPtr<HTMLElement> m_outlineElement;
    RefPtr<DeleteButton> m_buttonElement;
    bool m_wasStaticPositioned;
    bool m_wasAutoZIndex;
    unsigned m_disableStack;
};

class DeleteButtonControllerDisableScope {
public:
    DeleteButtonControllerDisableScope(Frame* frame)
        : m_frame(frame)
    {
        if (frame)
            frame->editor().deleteButtonController()->disable();
    }

    ~DeleteButtonControllerDisableScope()
    {
        if (m_frame)
            m_frame->editor().deleteButtonController()->enable();
    }

private:
    RefPtr<Frame> m_frame;
};

} // namespace WebCore

#endif // ENABLE(DELETION_UI)

#endif // DeleteButtonController_h