/* This file is part of the KDE project
   Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
   Copyright (c) 1999, 2000 Preston Brown <pbrown@kde.org>
   Copyright (c) 2000 Simon Hausmann <hausmann@kde.org>
   Copyright (c) 2000 David Faure <faure@kde.org>

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.

   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public License
   along with this library; see the file COPYING.LIB.  If not, write to
   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA 02110-1301, USA.
*/


#ifndef KPROPERTIESDIALOG_H
#define KPROPERTIESDIALOG_H

#include <QtCore/QString>

#include <kurl.h>
#include <kfileitem.h>
#include <kpagedialog.h>

class KPropertiesDialogPlugin;

class KJob;
namespace KIO { class Job; }

/**
 * The main properties dialog class.
 * A Properties Dialog is a dialog which displays various information
 * about a particular file or URL, or several files or URLs.
 * This main class holds various related classes, which are instantiated in
 * the form of tab entries in the tabbed dialog that this class provides.
 * The various tabs themselves will let the user view, and sometimes change,
 * information about the file or URL.
 *
 * \image html kpropertiesdialog.png "Typical KProperties Dialog"
 *
 * The best way to display the properties dialog is to use showDialog().
 * Otherwise, you should use (void)new KPropertiesDialog(...)
 * It will take care of deleting itself when closed.
 *
 * If you are looking for more flexibility, see KFileMetaInfo and
 * KFileMetaDataWidget.
 */
class KIO_EXPORT KPropertiesDialog : public KPageDialog
{
  Q_OBJECT

public:

  /**
   * Determine whether there are any property pages available for the
   * given file items.
   * @param _items the list of items to check.
   * @return true if there are any property pages, otherwise false.
   */
  static bool canDisplay( const KFileItemList& _items );

  /**
   * Brings up a Properties dialog, as shown above.
   * This is the normal constructor for
   * file-manager type applications, where you have a KFileItem instance
   * to work with.  Normally you will use this
   * method rather than the one below.
   *
   * @param item file item whose properties should be displayed.
   * @param parent is the parent of the dialog widget.
   * @param name is the internal name.
   */
  explicit KPropertiesDialog( const KFileItem& item,
                              QWidget* parent = 0 );

  /**
   * \overload
   *
   * You use this constructor for cases where you have a number of items,
   * rather than a single item. Be careful which methods you use
   * when passing a list of files or URLs, since some of them will only
   * work on the first item in a list.
   *
   * @param _items list of file items whose properties should be displayed.
   * @param parent is the parent of the dialog widget.
   * @param name is the internal name.
   */
  explicit KPropertiesDialog( const KFileItemList& _items,
                              QWidget *parent = 0 );

  /**
   * Brings up a Properties dialog. Convenience constructor for
   * non-file-manager applications, where you have a KUrl rather than a
   * KFileItem or KFileItemList.
   *
   * @param _url the URL whose properties should be displayed
   * @param parent is the parent of the dialog widget.
   * @param name is the internal name.
   *
   * IMPORTANT: This constructor, together with exec(), leads to a grave
   * display bug (due to KIO::stat() being run before the dialog has all the
   * necessary information). Do not use this combination for now.
   * TODO: Check if the above is still true with Qt4.
   * For local files with a known mimetype, simply create a KFileItem and pass
   * it to the other constructor.
   */
  explicit KPropertiesDialog( const KUrl& _url,
                              QWidget* parent = 0 );

  /**
   * Creates a properties dialog for a new .desktop file (whose name
   * is not known yet), based on a template. Special constructor for
   * "File / New" in file-manager type applications.
   *
   * @param _tempUrl template used for reading only
   * @param _currentDir directory where the file will be written to
   * @param _defaultName something to put in the name field,
   * like mimetype.desktop
   * @param parent is the parent of the dialog widget.
   * @param name is the internal name.
   */
  KPropertiesDialog( const KUrl& _tempUrl, const KUrl& _currentDir,
                     const QString& _defaultName,
                     QWidget* parent = 0 );

  /**
   * Creates an empty properties dialog (for applications that want use
   * a standard dialog, but for things not doable via the plugin-mechanism).
   *
   * @param title is the string display as the "filename" in the caption of the dialog.
   * @param parent is the parent of the dialog widget.
   * @param name is the internal name.
   * @param modal tells the dialog whether it should be modal.
   */
  explicit KPropertiesDialog(const QString& title,
                             QWidget* parent = 0);

  /**
   * Cleans up the properties dialog and frees any associated resources,
   * including the dialog itself. Note that when a properties dialog is
   * closed it cleans up and deletes itself.
   */
  virtual ~KPropertiesDialog();

  /**
   * Immediately displays a Properties dialog using constructor with
   * the same parameters.
   * On MS Windows, if @p item points to a local file, native (non modal) property
   * dialog is displayed (@p parent and @p modal are ignored in this case).
   *
   * @return true on successful dialog displaying (can be false on win32).
   */
  static bool showDialog(const KFileItem& item, QWidget* parent = 0,
                         bool modal = true);

  /**
   * Immediately displays a Properties dialog using constructor with
   * the same parameters.
   * On MS Windows, if @p _url points to a local file, native (non modal) property
   * dialog is displayed (@p parent and @p modal are ignored in this case).
   *
   * @return true on successful dialog displaying (can be false on win32).
   */
  static bool showDialog(const KUrl& _url, QWidget* parent = 0,
                         bool modal = true);

  /**
   * Immediately displays a Properties dialog using constructor with
   * the same parameters.
   * On MS Windows, if @p _items has one element and this element points
   * to a local file, native (non modal) property dialog is displayed
   * (@p parent and @p modal are ignored in this case).
   *
   * @return true on successful dialog displaying (can be false on win32).
   */
  static bool showDialog(const KFileItemList& _items, QWidget* parent = 0,
                         bool modal = true);

  /**
   * Adds a "3rd party" properties plugin to the dialog.  Useful
   * for extending the properties mechanism.
   *
   * To create a new plugin type, inherit from the base class KPropertiesDialogPlugin
   * and implement all the methods. If you define a service .desktop file
   * for your plugin, you do not need to call insertPlugin().
   *
   * @param plugin is a pointer to the KPropertiesDialogPlugin. The Properties
   *        dialog will do destruction for you. The KPropertiesDialogPlugin \b must
   *        have been created with the KPropertiesDialog as its parent.
   * @see KPropertiesDialogPlugin
   */
  void insertPlugin (KPropertiesDialogPlugin *plugin);

  /**
   * The URL of the file that has its properties being displayed.
   * This is only valid if the KPropertiesDialog was created/shown
   * for one file or URL.
   *
   * @return a parsed URL.
   */
  KUrl kurl() const;

  /**
   * @return the file item for which the dialog is shown
   *
   * Warning: this method returns the first item of the list.
   * This means that you should use this only if you are sure the dialog is used
   * for a single item. Otherwise, you probably want items() instead.
   */
  KFileItem& item();

  /**
   * @return the items for which the dialog is shown
   */
  KFileItemList items() const;

  /**
   * If the dialog is being built from a template, this method
   * returns the current directory. If no template, it returns QString().
   * See the template form of the constructor.
   *
   * @return the current directory or QString()
   */
  KUrl currentDir() const;

  /**
   * If the dialog is being built from a template, this method
   * returns the default name. If no template, it returns QString().
   * See the template form of the constructor.
   * @return the default name or QString()
   */
  QString defaultName() const;

  /**
   * Updates the item URL (either called by rename or because
   * a global apps/mimelnk desktop file is being saved)
   * Can only be called if the dialog applies to a single file or URL.
   * @param _newUrl the new URL
   */
  void updateUrl( const KUrl& _newUrl );

  /**
   * Renames the item to the specified name. This can only be called if
   * the dialog applies to a single file or URL.
   * @param _name new filename, encoded.
   * \see FilePropsDialogPlugin::applyChanges
   */
  void rename( const QString& _name );

  /**
   * To abort applying changes.
   */
  void abortApplying();

  /**
   * Shows the page that was previously set by
   * setFileSharingPage(), or does nothing if no page
   * was set yet.
   * \see setFileSharingPage
   */
  void showFileSharingPage();

  /**
   * Sets the file sharing page.
   * This page is shown when calling showFileSharingPage().
   *
   * @param page the page to set
   * \see showFileSharingPage
   */
  void setFileSharingPage(QWidget* page);

   /**
    * Call this to make the filename lineedit readonly, to prevent the user
    * from renaming the file.
    * \param ro true if the lineedit should be read only
    */
  void setFileNameReadOnly( bool ro );

public Q_SLOTS:
  /**
   * Called when the user presses 'Ok'.
   */
  virtual void slotOk();      // Deletes the PropertiesDialog instance
  /**
   * Called when the user presses 'Cancel'.
   */
  virtual void slotCancel();     // Deletes the PropertiesDialog instance

Q_SIGNALS:
  /**
   * This signal is emitted when the Properties Dialog is closed (for
   * example, with OK or Cancel buttons)
   */
  void propertiesClosed();

  /**
   * This signal is emitted when the properties changes are applied (for
   * example, with the OK button)
   */
  void applied();

  /**
   * This signal is emitted when the properties changes are aborted (for
   * example, with the Cancel button)
   */

  void canceled();
  /**
   * Emitted before changes to @p oldUrl are saved as @p newUrl.
   * The receiver may change @p newUrl to point to an alternative
   * save location.
   */
  void saveAs(const KUrl &oldUrl, KUrl &newUrl);

Q_SIGNALS:
  void leaveModality();
private:
  class KPropertiesDialogPrivate;
  KPropertiesDialogPrivate* const d;

    Q_DISABLE_COPY(KPropertiesDialog)
};

/**
 * A Plugin in the Properties dialog
 * This is an abstract class. You must inherit from this class
 * to build a new kind of tabbed page for the KPropertiesDialog.
 * A plugin in itself is just a library containing code, not a dialog's page.
 * It's up to the plugin to insert pages into the parent dialog.
 *
 * To make a plugin available, define a service that implements the KPropertiesDialog/Plugin
 * servicetype, as well as the mimetypes for which the plugin should be created.
 * For instance, ServiceTypes=KPropertiesDialog/Plugin,text/html,application/x-mymimetype.
 *
 * You can also include X-KDE-Protocol=file if you want that plugin
 * to be loaded only for local files, for instance.
 */
class KIO_EXPORT KPropertiesDialogPlugin : public QObject
{
  Q_OBJECT
public:
  /**
   * Constructor
   * To insert tabs into the properties dialog, use the add methods provided by
   * KPageDialog (the properties dialog is a KPageDialog).
   */
  KPropertiesDialogPlugin( KPropertiesDialog *_props );
  virtual ~KPropertiesDialogPlugin();

  /**
   * Applies all changes to the file.
   * This function is called when the user presses 'Ok'. The last plugin inserted
   * is called first.
   */
  virtual void applyChanges();

  void setDirty( bool b );
  bool isDirty() const;

public Q_SLOTS:
  void setDirty(); // same as setDirty( true ). TODO KDE5: void setDirty(bool dirty=true);

Q_SIGNALS:
  /**
   * Emit this signal when the user changed anything in the plugin's tabs.
   * The hosting PropertiesDialog will call applyChanges only if the
   * PropsPlugin has emitted this signal or if you have called setDirty() before.
   */
  void changed();

protected:
  /**
   * Pointer to the dialog
   */
  KPropertiesDialog *properties;

  /**
   * Returns the font height.
   */
  int fontHeight() const;

private:
  class KPropertiesDialogPluginPrivate;
  KPropertiesDialogPluginPrivate* const d;
};


#endif