/*
    This file is part of the KDE libraries
    SPDX-FileCopyrightText: 2007-2009 Urs Wolfer <uwolfer@kde.org>

    SPDX-License-Identifier: LGPL-2.0-or-later
*/

#ifndef KTITLEWIDGET_H
#define KTITLEWIDGET_H

#include <kwidgetsaddons_export.h>

#include <QWidget>
#include <memory>

/**
 * @class KTitleWidget ktitlewidget.h KTitleWidget
 *
 * @short Standard title widget.
 *
 * This class provides a widget often used for dialog titles.
 * \image html ktitlewidget.png "KTitleWidget with title and icon"
 *
 * KTitleWidget uses the general application font at 1.4 times its size to
 * style the text. This is a visual change from 4.x.
 *
 * @section Usage
 * KTitleWidget is very simple to use. You can either use its default text
 * (and pixmap) properties or display your own widgets in the title widget.
 *
 * A title text with a right-aligned pixmap:
 * @code
KTitleWidget *titleWidget = new KTitleWidget(this);
titleWidget->setText(i18n("Title"));
titleWidget->setIcon(QIcon::fromTheme("screen"));
 * @endcode
 *
 * Use it with an own widget:
 * @code
KTitleWidget *checkboxTitleWidget = new KTitleWidget(this);

QWidget *checkBoxTitleMainWidget = new QWidget(this);
QVBoxLayout *titleLayout = new QVBoxLayout(checkBoxTitleMainWidget);
titleLayout->setContentsMargins(6, 6, 6, 6);

QCheckBox *checkBox = new QCheckBox("Text Checkbox", checkBoxTitleMainWidget);
titleLayout->addWidget(checkBox);

checkboxTitleWidget->setWidget(checkBoxTitleMainWidget);
 * @endcode
 *
 * @see KPageView
 * @author Urs Wolfer \<uwolfer @ kde.org\>
 */
class KWIDGETSADDONS_EXPORT KTitleWidget : public QWidget
{
    Q_OBJECT
    Q_PROPERTY(QString text READ text WRITE setText)
    Q_PROPERTY(QString comment READ comment WRITE setComment)
    /// @since 5.72
    Q_PROPERTY(QIcon icon READ icon WRITE setIcon)
    /// @since 5.72
    Q_PROPERTY(QSize iconSize READ iconSize WRITE setIconSize)
    Q_PROPERTY(int autoHideTimeout READ autoHideTimeout WRITE setAutoHideTimeout)

public:
    /**
     * Possible title pixmap alignments.
     *
     * @li ImageLeft: Display the pixmap left
     * @li ImageRight: Display the pixmap right (default)
     */
    enum ImageAlignment {
        ImageLeft, /**< Display the pixmap on the left */
        ImageRight, /**< Display the pixmap on the right */
    };
    Q_ENUM(ImageAlignment)

    /**
     * Comment message types
     */
    enum MessageType {
        PlainMessage, /**< Normal comment */
        InfoMessage, /**< Information the user should be alerted to */
        WarningMessage, /**< A warning the user should be alerted to */
        ErrorMessage, /**< An error message */
    };

    /**
     * Constructs a title widget.
     */
    explicit KTitleWidget(QWidget *parent = nullptr);

    ~KTitleWidget() override;

    /**
     * @param widget Widget displayed on the title widget.
     */
    void setWidget(QWidget *widget);

    /**
     * @return the text displayed in the title
     * @see setText()
     */
    QString text() const;

    /**
     * @return the text displayed in the comment below the title, if any
     * @see setComment()
     */
    QString comment() const;

    /**
     * @return the icon displayed in the title
     * @see setIcon()
     *
     * @since 5.72
     */
    QIcon icon() const;

    /**
     * @return the size of the icon displayed in the title
     * @see setIconSize()
     *
     * @since 5.72
     */
    QSize iconSize() const;

    /**
     * Sets this label's buddy to buddy.
     * When the user presses the shortcut key indicated by the label in this
     * title widget, the keyboard focus is transferred to the label's buddy
     * widget.
     * @param buddy the widget to activate when the shortcut key is activated
     */
    void setBuddy(QWidget *buddy);

    /**
     * Get the current timeout value in milliseconds
     * @return timeout value in msecs
     */
    int autoHideTimeout() const;

    /**
     * @return The level of this title: it influences the font size following the guidelines in
     *         the <a href="https://develop.kde.org/hig/style/typography/">KDE HIG</a>.
     *         It also corresponds to the level api of Kirigami Heading for QML applications
     * @since 5.53
     */
    int level();

public Q_SLOTS:
    /**
     * @param text Text displayed on the label. It can either be plain text or rich text. If it
     * is plain text, the text is displayed as a bold title text.
     * @param alignment Alignment of the text. Default is left and vertical centered.
     * @see text()
     */
    void setText(const QString &text, Qt::Alignment alignment = Qt::AlignLeft | Qt::AlignVCenter);
    /**
     * @param text Text displayed on the label. It can either be plain text or rich text. If it
     * is plain text, the text is displayed as a bold title text.
     * @param type The sort of message it is; will also set the icon accordingly
     * @see text()
     */
    void setText(const QString &text, MessageType type);

    /**
     * @param comment Text displayed beneath the main title as a comment.
     *                It can either be plain text or rich text.
     * @param type The sort of message it is.
     * @see comment()
     */
    void setComment(const QString &comment, MessageType type = PlainMessage);

    /**
     * Set the icon to display in the header.
     * @param icon the icon to display in the header.
     * @param alignment alignment of the icon (default is right aligned).
     * @since 5.63
     */
    void setIcon(const QIcon &icon, ImageAlignment alignment = ImageRight);

    /**
     * @param type the type of message icon to display in the header
     * @param alignment alignment of the icon (default is right aligned).
     * @see icon()
     * @since 5.72
     */
    void setIcon(MessageType type, ImageAlignment alignment = ImageRight);

    /**
     * Set the size of the icon to display in the header.
     * @param iconSize the size of the icon, or an invalid QSize to reset to the default
     *
     * The default size is defined by the GUI style and its value for QStyle::PM_MessageBoxIconSize.
     *
     * @since 5.72
     */
    void setIconSize(const QSize &iconSize);

    /**
     * Set the autohide timeout of the label
     * Set value to 0 to disable autohide, which is the default.
     * @param msecs timeout value in milliseconds
     */
    void setAutoHideTimeout(int msecs);

    /**
     * Sets the level of this title, similar to HTML's h1 h2 h3...
     * Follows the <a href="https://develop.kde.org/hig/style/typography/">KDE HIG</a>.
     * @param level the level of the title, 1 is the biggest font and most important, descending
     * @since 5.53
     */
    void setLevel(int level);

protected:
    void changeEvent(QEvent *e) override;
    void showEvent(QShowEvent *event) override;
    bool eventFilter(QObject *object, QEvent *event) override;

private:
    std::unique_ptr<class KTitleWidgetPrivate> const d;

    Q_DISABLE_COPY(KTitleWidget)
};

#endif