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

  Library:   CTK

  Copyright (c) Kitware Inc.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0.txt

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

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

#ifndef __ctkSettingsDialog_h
#define __ctkSettingsDialog_h

// Qt includes
#include <QDialog>

// CTK includes
#include "ctkWidgetsExport.h"

class QAbstractButton;
class QSettings;
class QTreeWidgetItem;
class ctkSettingsDialogPrivate;
class ctkSettingsPanel;

/// \ingroup Widgets
class CTK_WIDGETS_EXPORT ctkSettingsDialog : public QDialog
{
  Q_OBJECT
  /// This property controls whether the reset button is visible in the
  /// button box or not. The Cancel button is a reset button and closes
  /// the dialog at the same time.
  Q_PROPERTY(bool resetButton READ resetButton WRITE setResetButton);

public:
  /// Superclass typedef
  typedef QDialog Superclass;

  /// Constructor
  explicit ctkSettingsDialog(QWidget* parent = 0);

  /// Destructor
  virtual ~ctkSettingsDialog();

  QSettings* settings()const;
  void setSettings(QSettings* settings);

  ctkSettingsPanel* panel(const QString& panel)const;
  ctkSettingsPanel* currentPanel()const;

  /// Uses the ctkSettingsPanel::windowTitle property to show in the list
  void addPanel(ctkSettingsPanel* panel, ctkSettingsPanel* parentPanel = 0);
  /// Utility function
  void addPanel(const QString& label, ctkSettingsPanel* panel, ctkSettingsPanel* parentPanel = 0);
  void addPanel(const QString& label, const QIcon& icon, ctkSettingsPanel* panel, ctkSettingsPanel* parentPanel = 0);

  bool resetButton()const;
  void setResetButton(bool show);

  /// True if at least one OptionRestartRequired setting is changed.
  /// It doesn't mean the user accepted to restart the application
  /// \sa restartRequired
  bool isRestartRequired()const;

public Q_SLOTS:
  void setCurrentPanel(ctkSettingsPanel* panel);
  void setCurrentPanel(const QString& label);

  void applySettings();
  void resetSettings();
  void restoreDefaultSettings();

  virtual void accept();
  virtual void reject();

  /// Resize the left panel based on the panels titles.
  void adjustTreeWidgetToContents();

Q_SIGNALS:
  void settingChanged(const QString& key, const QVariant& value);
  /// Signal fired when the user accepts to restart the application because
  /// some OptionRestartRequired settings have changed.
  /// \sa isrestartRequired
  void restartRequested();

protected Q_SLOTS:
  void onSettingChanged(const QString& key, const QVariant& newVal);
  void onCurrentItemChanged(QTreeWidgetItem* currentItem, QTreeWidgetItem* previous);
  void onDialogButtonClicked(QAbstractButton* button);

protected:
  virtual bool event(QEvent *);

protected:
  QScopedPointer<ctkSettingsDialogPrivate> d_ptr;

private:
  Q_DECLARE_PRIVATE(ctkSettingsDialog);
  Q_DISABLE_COPY(ctkSettingsDialog);
};

#endif