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

   Program: ParaView
   Module:    pqSearchBox.h

   Copyright (c) 2005,2006 Sandia Corporation, Kitware Inc.
   All rights reserved.

   ParaView is a free software; you can redistribute it and/or modify it
   under the terms of the ParaView license version 1.2.

   See License_v1.2.txt for the full ParaView license.
   A copy of this license can be obtained by contacting
   Kitware Inc.
   28 Corporate Drive
   Clifton Park, NY 12065
   USA

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
``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 THE AUTHORS 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 __pqSearchBox_h
#define __pqSearchBox_h

#include <QWidget>
#include <QScopedPointer>
#include "pqComponentsModule.h"

class QSettings;
/// pqSearchBox is a line edit and an advanced tool button in the same
/// layout. Most of the time, the text of the line edit is used to
/// filter the properties of the panel.
/// The pqSearchBox adds some functionnalities:
///   - When the user presses Esc, the current search text is cleared.
///   - The advanced button has different configuration that allow to choose
///   its behavior. See the advancedSearchEnabled and the settingKey properties
///   for more details.
/// The search box text can be accessed through the text property. The same
/// goes for the advanced button state through the advancedSearchActive
/// property (although it depends on the current advancedSearchEnabled).
class PQCOMPONENTS_EXPORT pqSearchBox : public QWidget
{
  Q_OBJECT

  /// The text property allow to access the text in the search box line edit.
  /// Default is empty.
  /// \sa QLineEdit
  Q_PROPERTY(QString text READ text WRITE setText NOTIFY textChanged USER true)

  /// The placeholderText property mirrors the line edit placeholderText
  /// property.
  /// Default text is "Search... (use Esc to clear text)"
  /// \sa QLineEdit
  Q_PROPERTY(QString placeholderText READ placeholderText WRITE setPlaceholderText)

 /// The advancedSearchActive allows the user to access/control the advanced
 /// search button state depending on the current advancedSearchEnabled
 /// property.
 /// \sa advancedSearchEnabled property
  Q_PROPERTY(bool advancedSearchActive
    READ isAdvancedSearchActive
    WRITE setAdvancedSearchActive
    NOTIFY advancedSearchActivated)

  /// This property governs whether the advanced search button is enabled 
  /// and visible (enabled == visible).
  /// By default the advanced search button is disabled/hidden.
  Q_PROPERTY(bool advancedSearchEnabled
    READ isAdvancedSearchEnabled
    WRITE setAdvancedSearchEnabled)

  /// When the advanced search is enabled, the button can save/restore its
  /// state from the settings using the settingKey property. If the key
  /// is empty then the settings have no influence on the advanced button
  /// state.
  /// In the following cases, the widget will restore the advanced button
  /// state to the setting key value:
  ///  - When changing the setting key to a new valid (i.e. non-empty) key
  ///  - When enabling the advanced button with a valid key already present.
  /// By default the setting key is empty, meaning that the advanced button
  /// state isn't saved in the settings;
  Q_PROPERTY(QString settingKey
    READ settingKey
    WRITE setSettingKey
    NOTIFY settingKeyChanged)

public:
  typedef QWidget Superclass;

  pqSearchBox(QWidget *parent=0);
  pqSearchBox(
    bool advancedSearchEnabled,
    const QString &settingKey = "",
    QWidget *parent=0);

  virtual ~pqSearchBox();

  /// Returns whether the advanced button is activated.
  /// advancedSearchActive property
  bool isAdvancedSearchActive() const;

  /// Get the current search text.
  /// \sa text property, QLineEdit
  QString text() const;

  /// Set/Get the current search text.
  /// \sa placeholderText property, QLineEdit
  QString placeholderText() const;
  void setPlaceholderText(const QString& text);

  /// Get the current setting key used to save the advanced button check state.
  /// \sa settingKey property
  QString settingKey() const;

  /// Convinience method to access the settings. It should not be used to
  /// modify the advanced button state. Use setAdvancedSearchActive() instead.
  QSettings* settings() const;

  /// Return whether the advanced search button is visible/enabled.
  /// \sa advancedSearchEnabled property
  bool isAdvancedSearchEnabled() const;

signals:
  /// Sent when the advanced button is toggled. Note that no signal is
  /// sent when the configuration is None.
  /// \sa advancedSearchActive property
  void advancedSearchActivated(bool);

  /// Sent whenever the search text is changed.
  /// \sa text property, QLineEdit
  void textChanged(const QString &);

  /// Sent whenever the setting key was changed.
  /// \sa settingKey property
  void settingKeyChanged(const QString &);

public slots:
  /// Toggle the advanced search button. This is a no-op when the configuration
  /// is None.
  //// \sa advancedSearchActive property
  void setAdvancedSearchActive(bool use);

  /// Set the search text.
  /// \sa text property, QLineEdit
  void setText(const QString& text);

  /// Set the new setting key that will be used to restore/save the advanced
  /// button check state. If the given key is valid (i.e. not empty), the
  /// button state will be restored from the key value.
  /// The old key is left unchanged in the setting to whatever its last value
  /// was. Although returned, removing (or not) the old key is up to the user.
  /// \sa settingKey property
  QString setSettingKey(const QString& key);

  /// Set whether the advanced button is visible/enabled.
  /// \sa advancedSearchEnabled property
  void setAdvancedSearchEnabled(bool enable);

protected:
  virtual void keyPressEvent(QKeyEvent *e);

protected slots:
  void onAdvancedButtonClicked(bool);
  void updateSettings();
  void updateFromSettings();

private:
  pqSearchBox(const pqSearchBox&); // Not implemented.
  void operator=(const pqSearchBox&); // Not implemented.

  class pqInternals;
  friend class pqInternals;

  const QScopedPointer<pqInternals> Internals;
  QString SettingKey;
};

#endif
