/*
    This file is part of the KDE Libraries
    SPDX-FileCopyrightText: 1999-2001 Mirko Boehm <mirko@kde.org>
    SPDX-FileCopyrightText: 1999-2001 Espen Sand <espen@kde.org>
    SPDX-FileCopyrightText: 1999-2001 Holger Freyther <freyther@kde.org>
    SPDX-FileCopyrightText: 2005-2006 Olivier Goffart <ogoffart at kde.org>
    SPDX-FileCopyrightText: 2006 Tobias Koenig <tokoe@kde.org>

    SPDX-License-Identifier: LGPL-2.0-or-later
*/
#ifndef KPAGEDIALOG_H
#define KPAGEDIALOG_H

#include <QDialog>
#include <QDialogButtonBox>
#include <kpagewidget.h>

class KPageDialogPrivate;

/**
 * @class KPageDialog kpagedialog.h KPageDialog
 *
 * @short A dialog base class which can handle multiple pages.
 *
 * This class provides a dialog base class which handles multiple
 * pages and allows the user to switch between these pages in
 * different ways.
 *
 * Currently, @p Auto, @p Plain, @p List, @p Tree and @p Tabbed face
 * types are available (cmp. KPageView).
 *
 * <b>Example:</b>\n
 *
 * \code
 * UrlDialog::UrlDialog( QWidget *parent )
 *   : KPageDialog( parent )
 * {
 *   setFaceType( List );
 *
 *   QLabel *label = new QLabel( "Test Page" );
 *   addPage( label, i18n( "My Test Page" ) );
 *
 *   label = new QLabel( "Second Test Page" );
 *   KPageWidgetItem *page = new KPageWidgetItem( label, i18n( "My Second Test Page" ) );
 *   page->setHeader( i18n( "My header string" ) );
 *   page->setIcon( QIcon::fromTheme( "file" ) );
 *
 *   addPage( page );
 * }
 * \endcode
 *
 * @author Tobias Koenig (tokoe@kde.org)
 */
class KWIDGETSADDONS_EXPORT KPageDialog : public QDialog
{
    Q_OBJECT
    Q_DECLARE_PRIVATE(KPageDialog)

public:

    /**
     * The face types supported.
     */
    enum FaceType {
        /**
         * A dialog with a face based on the structure of the available pages.
         * If only a single page is added, the dialog behaves like
         * in @c Plain mode, with multiple pages without sub pages
         * it behaves like in @c List mode and like in @c Tree mode otherwise.
         */
        Auto   = KPageView::Auto,
        /**
         * A normal dialog
         */
        Plain  = KPageView::Plain,
        /**
         * A dialog with an icon list on the left side and a
         * representation of the contents on the right side
         */
        List   = KPageView::List,
        /**
         * A dialog with a tree on the left side and a
         * representation of the contents on the right side
         */
        Tree   = KPageView::Tree,
        /**
         * A dialog with a tab bar above the representation
         * of the contents
         */
        Tabbed = KPageView::Tabbed
    };

public:
    /**
     * Creates a new page dialog.
     */
    explicit KPageDialog(QWidget *parent = nullptr, Qt::WindowFlags flags = Qt::WindowFlags());

    /**
     * Destroys the page dialog.
     */
    ~KPageDialog();

    /**
     * Sets the face type of the dialog.
     */
    void setFaceType(FaceType faceType);

    /**
     * Adds a new top level page to the dialog.
     *
     * @param widget The widget of the page.
     * @param name The name which is displayed in the navigation view.
     *
     * @returns The associated KPageWidgetItem.
     */
    KPageWidgetItem *addPage(QWidget *widget, const QString &name);

    /**
     * Adds a new top level page to the dialog.
     *
     * @param item The KPageWidgetItem which describes the page.
     */
    void addPage(KPageWidgetItem *item);

    /**
     * Inserts a new page in the dialog.
     *
     * @param before The new page will be insert before this KPageWidgetItem
     *               on the same level in hierarchy.
     * @param widget The widget of the page.
     * @param name The name which is displayed in the navigation view.
     *
     * @returns The associated KPageWidgetItem.
     */
    KPageWidgetItem *insertPage(KPageWidgetItem *before, QWidget *widget, const QString &name);

    /**
     * Inserts a new page in the dialog.
     *
     * @param before The new page will be insert before this KPageWidgetItem
     *               on the same level in hierarchy.
     *
     * @param item The KPageWidgetItem which describes the page.
     */
    void insertPage(KPageWidgetItem *before, KPageWidgetItem *item);

    /**
     * Inserts a new sub page in the dialog.
     *
     * @param parent The new page will be insert as child of this KPageWidgetItem.
     * @param widget The widget of the page.
     * @param name The name which is displayed in the navigation view.
     *
     * @returns The associated KPageWidgetItem.
     */
    KPageWidgetItem *addSubPage(KPageWidgetItem *parent, QWidget *widget, const QString &name);

    /**
     * Inserts a new sub page in the dialog.
     *
     * @param parent The new page will be insert as child of this KPageWidgetItem.
     *
     * @param item The KPageWidgetItem which describes the page.
     */
    void addSubPage(KPageWidgetItem *parent, KPageWidgetItem *item);

    /**
     * Removes the page associated with the given KPageWidgetItem.
     */
    void removePage(KPageWidgetItem *item);

    /**
     * Sets the page which is associated with the given KPageWidgetItem to
     * be the current page and emits the currentPageChanged() signal.
     */
    void setCurrentPage(KPageWidgetItem *item);

    /**
     * Returns the KPageWidgetItem for the current page or a null pointer if there is no
     * current page.
     */
    KPageWidgetItem *currentPage() const;

    /**
     * Sets the collection of standard buttons displayed by this dialog.
     */
    void setStandardButtons(QDialogButtonBox::StandardButtons buttons);

    /**
     * Returns the QPushButton corresponding to the standard button which, or a null pointer if the standard
     * button doesn't exist in this dialog.
     */
    QPushButton *button(QDialogButtonBox::StandardButton which) const;

    /**
      * Set an action button.
      */
    void addActionButton(QAbstractButton *button);

Q_SIGNALS:
    /**
     * This signal is emitted whenever the current page has changed.
     *
     * @param current The new current page or a null pointer if no current page is available.
     * @param before The page that was current before the new current page has changed.
     */
    void currentPageChanged(KPageWidgetItem *current, KPageWidgetItem *before);

    /**
     * This signal is emitted whenever a page has been removed.
     *
     * @param page The page which has been removed
     */
    void pageRemoved(KPageWidgetItem *page);

protected:
    /**
     * This constructor can be used by subclasses to provide a custom page widget.
     *
     * \param widget The KPageWidget object will be reparented to this object, so you can create
     * it without parent and you are not allowed to delete it.
     */
    KPageDialog(KPageWidget *widget, QWidget *parent, Qt::WindowFlags flags = Qt::WindowFlags());
    KPageDialog(KPageDialogPrivate &dd, KPageWidget *widget, QWidget *parent, Qt::WindowFlags flags = Qt::WindowFlags());

    /**
     * Returns the page widget of the dialog or a null pointer if no page widget is set.
     */
    KPageWidget *pageWidget();

    /**
     * Returns the page widget of the dialog or a null pointer if no page widget is set.
     */
    const KPageWidget *pageWidget() const;

    /**
     * Set the page widget of the dialog.
     *
     * @note the previous pageWidget will be deleted.
     *
     * @param widget The KPageWidget object will be reparented to this object, so you can create
     * it without parent and you are not allowed to delete it.
     */
    void setPageWidget(KPageWidget *widget);

    /**
     * Returns the button box of the dialog or a null pointer if no button box is set.
     */
    QDialogButtonBox *buttonBox();

    /**
     * Returns the button box of the dialog or a null pointer if no button box is set.
     */
    const QDialogButtonBox *buttonBox() const;

    /**
     * Set the button box of the dialog
     *
     * @note the previous buttonBox will be deleted.
     *
     * @param box The QDialogButtonBox object will be reparented to this object, so you can create
     * it without parent and you are not allowed to delete it.
     */
    void setButtonBox(QDialogButtonBox *box);

protected:
    KPageDialogPrivate *const d_ptr;
};

#endif
