/*=========================================================================

  Library:   CTK

  Copyright (c) Kitware Inc. 
  All rights reserved.
  Distributed under a BSD License. See LICENSE.txt file.

  This software is distributed "AS IS" WITHOUT ANY WARRANTY; without even
  the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the above copyright notice for more information.

=========================================================================*/

#ifndef __ctkCollapsibleButton_h
#define __ctkCollapsibleButton_h

// Qt includes
#include <QAbstractButton>
#include <QFrame>

// CTK includes
#include <ctkPimpl.h>
#include "CTKWidgetsExport.h"

class ctkCollapsibleButtonPrivate;
class QStyleOptionButton;

/// Description
/// A Collapsible widget that show/hide its children depending on its checked/collapsed properties
class CTK_WIDGETS_EXPORT ctkCollapsibleButton : public QAbstractButton
{
  Q_OBJECT
  Q_PROPERTY(bool collapsed READ collapsed WRITE setCollapsed DESIGNABLE isCheckable NOTIFY contentsCollapsed)
  Q_PROPERTY(int collapsedHeight READ collapsedHeight WRITE setCollapsedHeight)

  Q_PROPERTY(QFrame::Shape contentsFrameShape READ contentsFrameShape WRITE setContentsFrameShape)
  Q_PROPERTY(QFrame::Shadow contentsFrameShadow READ contentsFrameShadow WRITE setContentsFrameShadow)
  Q_PROPERTY(int contentsLineWidth READ contentsLineWidth WRITE setContentsLineWidth)
  Q_PROPERTY(int contentsMidLineWidth READ contentsMidLineWidth WRITE setContentsMidLineWidth)

public:
  ctkCollapsibleButton(QWidget *parent = 0);
  ctkCollapsibleButton(const QString& text, QWidget *parent = 0);
  virtual ~ctkCollapsibleButton();

  /// 
  /// Property that describes if the widget is collapsed or not.
  /// When collapsed, the children are invisible and the widget
  /// has a sized defined by CollapsedHeight
  void setCollapsed(bool);
  bool collapsed()const;

  /// 
  /// Height used when the widget is collapsed
  void setCollapsedHeight(int);
  int collapsedHeight()const;

  /// 
  /// Set the frame shape of the contents
  /// Hint: StyledPanel is probably the shape you are looking for
  QFrame::Shape contentsFrameShape() const;
  void setContentsFrameShape(QFrame::Shape);

  /// 
  /// Set the frame shadow of the contents
  /// Hint: Raised is probably the shadow you are looking for
  QFrame::Shadow contentsFrameShadow() const;
  void setContentsFrameShadow(QFrame::Shadow);

  /// 
  /// Set the line width of the frame around the contents
  int contentsLineWidth() const;
  void setContentsLineWidth(int);

  /// 
  /// Set the mid line width of the frame around the contents
  int contentsMidLineWidth() const;
  void setContentsMidLineWidth(int);

  /// 
  /// Reimplement for internal reasons
  virtual QSize minimumSizeHint()const;

  /// 
  /// Reimplement for internal reasons
  virtual QSize sizeHint()const;

signals:
  /// 
  /// Signal emitted when the widget is collapsed or expanded.
  /// See signal toggled(bool) for the opposite.
  void contentsCollapsed(bool);

protected slots:
  /// 
  /// Perform the collapse.
  virtual void collapse(bool c);
  virtual void onToggled(bool clicked = false);

protected:
  virtual void paintEvent(QPaintEvent*);
  //virtual void mousePressEvent(QMouseEvent* event);
  //virtual void mouseReleaseEvent(QMouseEvent* event);
  virtual void childEvent(QChildEvent* c);

  virtual bool hitButton(const QPoint & pos) const;
  /// Compute the size hint of the head button only. The sizehint depends on the text.
  virtual QSize buttonSizeHint() const;

  /// Initialize option with the values from this ctkCollapsibleButton.
  /// This method is useful for subclasses when they need a QStyleOptionButton, 
  /// but don't want to fill in all the information themselves.
  virtual void initStyleOption(QStyleOptionButton* option)const;

private:
  CTK_DECLARE_PRIVATE(ctkCollapsibleButton);
};

#endif