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// This may look like C code, but it's really -*- C++ -*-
/*
 * Copyright (C) 2008 Emweb bvba, Kessel-Lo, Belgium.
 *
 * See the LICENSE file for terms of use.
 */
#ifndef WLAYOUT_ITEM_IMPL_H_
#define WLAYOUT_ITEM_IMPL_H_

#include <Wt/WDllDefs.h>
#include <string>

namespace Wt {

class WLayoutItem;
class WWidget;

/*! \class WLayoutItemImpl Wt/WLayoutItemImpl Wt/WLayoutItemImpl
 *  \brief An abstract base class for implementing layout managers.
 *
 * \sa WLayoutItem, WLayout
 */
class WT_API WLayoutItemImpl
{
public:
  /*! \brief Destructor.
   */
  virtual ~WLayoutItemImpl();

  /*! \brief Adds a layout <i>item</i>.
   *
   * The \p item already has an implementation set.
   */
  virtual void updateAddItem(WLayoutItem *item) = 0;

  /*! \brief Removes a layout <i>item</i>.
   */
  virtual void updateRemoveItem(WLayoutItem *item) = 0;

  /*! \brief Updates the layout.
   */
  virtual void update(WLayoutItem *item) = 0;

  /*! \brief Returns the widget for which this layout item participates in
   *         layout management.
   */
  virtual WWidget *parentWidget() const = 0;

  /*! \brief Provides a hint that can aid in layout strategy / algorithm.
   */
  virtual void setHint(const std::string& name, const std::string& value) = 0;
};

}

#endif // WLAYOUT_ITEM_IMPL_H_