/*
 * This file is part of the KDE project
 * Copyright (C) 2015 David Edmundson <davidedmundson@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 KCOLLAPSIBLEGROUPBOX_H
#define KCOLLAPSIBLEGROUPBOX_H

#include <kwidgetsaddons_export.h>

#include <QWidget>

class KCollapsibleGroupBoxPrivate;

/**
 * @class KCollapsibleGroupBox kcollapsiblegroupbox.h KCollapsibleGroupBox
 *
 * A groupbox featuring a clickable header and arrow indicator that can be
 * expanded and collapsed to reveal the contents.
 *
 * When expanded, the widget will resize to fit the sizeHint of child items.
 *
 * @since 5.16
 */
class KWIDGETSADDONS_EXPORT KCollapsibleGroupBox : public QWidget
{
    Q_OBJECT
    Q_PROPERTY(QString title READ title WRITE setTitle NOTIFY titleChanged)
    Q_PROPERTY(bool expanded READ isExpanded WRITE setExpanded NOTIFY expandedChanged)

public:
    explicit KCollapsibleGroupBox(QWidget *parent = nullptr);
    ~KCollapsibleGroupBox() override;

    /**
     * Set the title that will be permanently shown at the top of the collapsing box
     * Mnemonics are supported
     */
    void setTitle(const QString &title);

    /**
     * The title
     */
    QString title() const;

    /**
     * Set whether contents are shown
     *
     * The default is false until the user clicks
     */
    void setExpanded(bool expanded);

    /**
     * Whether contents are shown
     * During animations, this will reflect the target state at the end of the animation
     */
    bool isExpanded() const;

    QSize sizeHint() const override;
    QSize minimumSizeHint() const override;

public Q_SLOTS:
    /**
     * Expands if collapsed and vice versa
     */
    void toggle();

    /**
     * Equivalent to setExpanded(true)
     */
    void expand();

    /**
     * Equivalent to setExpanded(false)
     */
    void collapse();

Q_SIGNALS:
    /**
     * Emitted when the title is changed
     */
    void titleChanged();

    /**
     * Emitted when the widget expands or collapsed
     */
    void expandedChanged();

protected:
    void paintEvent(QPaintEvent*) override;

    bool event(QEvent*) override;
    void mousePressEvent(QMouseEvent*) override;
    void mouseMoveEvent(QMouseEvent*) override;
    void leaveEvent(QEvent*) override;
    void keyPressEvent(QKeyEvent*) override;
    void resizeEvent(QResizeEvent*) override;

private Q_SLOTS:
    void overrideFocusPolicyOf(QWidget *widget);

private:
    KCollapsibleGroupBoxPrivate *const d;

    Q_DISABLE_COPY(KCollapsibleGroupBox)
};

#endif
