/***************************************************************************
 *   Copyright 2011 Marco Martin <mart@kde.org>                            *
 *   Copyright 2011 Artur Duque de Souza <asouza@kde.org>                  *
 *   Copyright 2013 Sebastian Kügler <sebas@kde.org>                       *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program 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 General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA .        *
 ***************************************************************************/

#ifndef TOOLTIPOBJECT_H
#define TOOLTIPOBJECT_H

#include <QQuickItem>
#include <QWeakPointer>
#include <QtCore/QVariant>
#include <Plasma/Plasma>

class QQuickItem;
class QGraphicsWidget;
class ToolTipDialog;

/**
 * @class ToolTip
 *
 * An Item managing a Plasma-themed tooltip. It is rendered in its own window.
 * You can either specify icon, mainText and subText, or a custom Component
 * that will be put inside the tooltip. By default the tooltip will be
 * rendered when hovering over the parent item.
 *
 * The item inside the ToolTipArea is loaded on demand and will be destroyed when the
 * tooltip is being hidden.
 *
 * Example usage:
 * @code
 * import org.kde.plasma.core 2.0 as PlasmaCore
 *
 * [...]
 * PlasmaCore.IconItem {
 *     ...
 *     PlasmaCore.ToolTipArea {
 *         mainText: i18n("Tooltip Title")
 *         subText: i18n("Some explanation.")
 *         icon: "plasma"
 *         // alternatively, you can specify your own component
 *         // to be loaded when the tooltip shows
 *         mainItem: Component {
 *              YourCustomItem { ...  }
 *         }
 * ... }
 * }
 * @endcode
 *
 */
class ToolTip : public QQuickItem
{
    Q_OBJECT

    /**
     * The item shown inside the tooltip.
     */
    Q_PROPERTY(QQuickItem *mainItem READ mainItem WRITE setMainItem NOTIFY mainItemChanged)

    /**
     * The main text of this tooltip
     */
    Q_PROPERTY(QString mainText READ mainText WRITE setMainText NOTIFY mainTextChanged)

    /**
     * The description of this tooltip
     */
    Q_PROPERTY(QString subText READ subText WRITE setSubText NOTIFY subTextChanged)

    /**
     * how to handle the text format of the tooltip subtext:
     * * Text.AutoText (default)
     * * Text.PlainText
     * * Text.StyledText
     * * Text.RichText
     * Note: in the default implementation the main text is always plain text
     */
    Q_PROPERTY(int textFormat READ textFormat WRITE setTextFormat NOTIFY textFormatChanged)

    /**
     * An icon for this tooltip, accepted values are an icon name, a QIcon, QImage or QPixmap
     */
    Q_PROPERTY(QVariant icon READ icon WRITE setIcon NOTIFY iconChanged)

    /**
     * Returns whether the mouse is inside the item
     */
    Q_PROPERTY(bool containsMouse READ containsMouse NOTIFY containsMouseChanged)

    /**
     * Plasma Location of the dialog window. Useful if this dialog is a popup for a panel
     */
    Q_PROPERTY(Plasma::Types::Location location READ location WRITE setLocation NOTIFY locationChanged)

    /**
     * TODO: single property for images?
     * An image for this tooltip, accepted values are an icon name, a QIcon, QImage or QPixmap
     */
    Q_PROPERTY(QVariant image READ image WRITE setImage NOTIFY imageChanged)

    /**
     * Property that controls if a tooltips will show on mouse over.
     * The default is true.
     */
    Q_PROPERTY(bool active MEMBER m_active WRITE setActive NOTIFY activeChanged)

    /**
     * if interactive is false (default), the tooltip will automatically hide
     * itself as soon as the mouse leaves the tooltiparea, if is true, if the mouse leaves tooltiparea and goes over the tooltip itself, the tooltip won't hide, so it will be possible to interact with tooltip contents
     */
    Q_PROPERTY(bool interactive MEMBER m_interactive WRITE setInteractive NOTIFY interactiveChanged)

public:
/// @cond INTERNAL_DOCS
    ToolTip(QQuickItem *parent = 0);
    ~ToolTip();

    QQuickItem *mainItem() const;
    void setMainItem(QQuickItem *mainItem);

    void showToolTip();

    QString mainText() const;
    void setMainText(const QString &mainText);

    QString subText() const;
    void setSubText(const QString &subText);

    int textFormat() const;
    void setTextFormat(int format);

    QVariant icon() const;
    void setIcon(const QVariant &icon);

    QVariant image() const;
    void setImage(const QVariant &image);

    Plasma::Types::Location location() const;
    void setLocation(Plasma::Types::Location location);

    bool containsMouse() const;
    void setContainsMouse(bool contains);

    void setActive(bool active);

    void setInteractive(bool interactive);
/// @endcond

public Q_SLOTS:
    /**
     * Hides the tooltip if shown. Does not affect whether the tooltip area is active.
     */
    void hideToolTip();

protected:
/// @cond INTERNAL_DOCS
    bool childMouseEventFilter(QQuickItem *item, QEvent *event) Q_DECL_OVERRIDE;
    void hoverEnterEvent(QHoverEvent *event) Q_DECL_OVERRIDE;
    void hoverLeaveEvent(QHoverEvent *event) Q_DECL_OVERRIDE;

    ToolTipDialog *tooltipDialogInstance();
/// @endcond

Q_SIGNALS:
    void mainItemChanged();
    void visibleChanged();
    void mainTextChanged();
    void subTextChanged();
    void textFormatChanged();
    void iconChanged();
    void imageChanged();
    void containsMouseChanged();
    void locationChanged();
    void activeChanged();
    void interactiveChanged();

private Q_SLOTS:
    void settingsChanged();

private:
    bool isValid() const;

    void loadSettings();
    bool m_tooltipsEnabledGlobally;
    bool m_containsMouse;
    Plasma::Types::Location m_location;
    QWeakPointer<QQuickItem> m_mainItem;
    QTimer *m_showTimer;
    QString m_mainText;
    QString m_subText;
    int m_textFormat;
    QVariant m_image;
    QVariant m_icon;
    bool m_active;
    bool m_interactive;
    int m_interval;

    //ToolTipDialog is not a Q_GLOBAL_STATIC because QQuickwindows as global static
    //are deleted too later after some stuff in the qml runtime has already been deleted,
    //causing a crash on exit
    bool m_usingDialog : 1;
    static ToolTipDialog *s_dialog;
    static int s_dialogUsers;
};

#endif
