#ifndef adwaitastyle_h

#define adwaitastyle_h

/*************************************************************************

 * Copyright (C) 2014 by Hugo Pereira Da Costa <hugo.pereira@free.fr>    *

 *                                                                       *

 * 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 .        *

 *************************************************************************/

#include "adwaita.h"

#include "config-adwaita.h"

#if ADWAITA_USE_KDE4

#include "kstylekde4compat.h"

#endif

#include <QAbstractItemView>

#include <QAbstractScrollArea>

#include <QCommonStyle>

#include <QDockWidget>

#include <QHash>

#include <QIcon>

#include <QMdiSubWindow>

#include <QStyleOption>

#include <QWidget>

#if QT_VERSION >= 0x050000

#include <QCommandLinkButton>

#endif

namespace AdwaitaPrivate

{

    class TabBarData;

}

namespace Adwaita

{

    class Animations;

    class Helper;

    class Mnemonics;

    class SplitterFactory;

    class WidgetExplorer;

    class WindowManager;

    //* convenience typedef for base class

    #if ADWAITA_USE_KDE4

    using ParentStyleClass = KStyleKDE4Compat;

    #else

    using ParentStyleClass = QCommonStyle;

    #endif

    //* base class for adwaita style

    /** it is responsible to draw all the primitives to be displayed on screen, on request from Qt paint engine */

    class Style: public ParentStyleClass

    {

        Q_OBJECT

        /* this tells kde applications that custom style elements are supported, using the kstyle mechanism */

        Q_CLASSINFO ("X-KDE-CustomElements", "true")

        public:

        //* constructor

        explicit Style( bool dark );

        //* destructor

        virtual ~Style( void );

        //* needed to avoid warnings at compilation time

        using  ParentStyleClass::polish;

        using  ParentStyleClass::unpolish;

        //* widget polishing

        virtual void polish( QWidget* );

        //* widget unpolishing

        virtual void unpolish( QWidget* );

        //* palette polishing

        virtual void polish( QPalette &palette );

        //* polish scrollarea

        void polishScrollArea( QAbstractScrollArea* );

        //* pixel metrics

        virtual int pixelMetric(PixelMetric, const QStyleOption* = nullptr, const QWidget* = nullptr) const;

        //* style hints

        virtual int styleHint(StyleHint, const QStyleOption* = nullptr, const QWidget* = nullptr, QStyleHintReturn* = nullptr) const;

        //* returns rect corresponding to one widget's subelement

        virtual QRect subElementRect( SubElement, const QStyleOption*, const QWidget* ) const;

        //* returns rect corresponding to one widget's subcontrol

        virtual QRect subControlRect( ComplexControl, const QStyleOptionComplex*, SubControl, const QWidget* ) const;

        //* returns size matching contents

        QSize sizeFromContents( ContentsType, const QStyleOption*, const QSize&, const QWidget* ) const;

        //* returns which subcontrol given QPoint corresponds to

        SubControl hitTestComplexControl( ComplexControl, const QStyleOptionComplex*, const QPoint&, const QWidget* ) const;

        //* primitives

        void drawPrimitive( PrimitiveElement, const QStyleOption*, QPainter*, const QWidget* ) const;

        //* controls

        void drawControl( ControlElement, const QStyleOption*, QPainter*, const QWidget* ) const;

        //* complex controls

        void drawComplexControl( ComplexControl, const QStyleOptionComplex*, QPainter*, const QWidget* ) const;

        //* generic text rendering

        virtual void drawItemText(

            QPainter*, const QRect&, int alignment, const QPalette&, bool enabled,

            const QString&, QPalette::ColorRole = QPalette::NoRole) const;

        //*@name event filters

        //@{

        virtual bool eventFilter(QObject *, QEvent *);

        bool eventFilterScrollArea( QWidget*, QEvent* );

        bool eventFilterComboBoxContainer( QWidget*, QEvent* );

        bool eventFilterDockWidget( QDockWidget*, QEvent* );

        bool eventFilterMdiSubWindow( QMdiSubWindow*, QEvent* );

        #if QT_VERSION >= 0x050000

        bool eventFilterCommandLinkButton( QCommandLinkButton*, QEvent* );

        #endif

        //* install event filter to object, in a unique way

        void addEventFilter( QObject* object )

        {

            object->removeEventFilter( this );

            object->installEventFilter( this );

        }

        //@}

        protected Q_SLOTS:

        //* update configuration

        void configurationChanged( void );

        //* standard icons

        virtual QIcon standardIconImplementation( StandardPixmap, const QStyleOption*, const QWidget* ) const;

        protected:

        //* standard icons

        virtual QIcon standardIcon( StandardPixmap pixmap, const QStyleOption* option = nullptr, const QWidget* widget = nullptr) const

        { return standardIconImplementation( pixmap, option, widget ); }

        //* load configuration

        void loadConfiguration();

        //*@name subelementRect specialized functions

        //@{

        //* default implementation. Does not change anything

        QRect defaultSubElementRect( const QStyleOption* option, const QWidget* ) const

        { return option->rect; }

        QRect pushButtonContentsRect( const QStyleOption*, const QWidget* ) const;

        QRect pushButtonFocusRect( const QStyleOption*, const QWidget* ) const;

        QRect checkBoxContentsRect( const QStyleOption*, const QWidget* ) const;

        QRect checkBoxIndicatorRect( const QStyleOption*, const QWidget* ) const;

        QRect checkBoxFocusRect( const QStyleOption*, const QWidget* ) const;

        QRect lineEditContentsRect( const QStyleOption*, const QWidget* ) const;

        QRect progressBarGrooveRect( const QStyleOption*, const QWidget* ) const;

        QRect progressBarContentsRect( const QStyleOption*, const QWidget* ) const;

        QRect progressBarLabelRect( const QStyleOption*, const QWidget* ) const;

        QRect headerArrowRect( const QStyleOption*, const QWidget* ) const;

        QRect headerLabelRect( const QStyleOption*, const QWidget* ) const;

        QRect sliderFocusRect( const QStyleOption*, const QWidget* ) const;

        QRect tabBarTabLeftButtonRect( const QStyleOption*, const QWidget* ) const;

        QRect tabBarTabRightButtonRect( const QStyleOption*, const QWidget* ) const;

        QRect tabWidgetTabBarRect( const QStyleOption*, const QWidget* ) const;

        QRect tabWidgetTabContentsRect( const QStyleOption*, const QWidget* ) const;

        QRect tabWidgetTabPaneRect( const QStyleOption*, const QWidget* ) const;

        QRect tabWidgetCornerRect( SubElement, const QStyleOption*, const QWidget* widget ) const;

        QRect toolBoxTabContentsRect( const QStyleOption*, const QWidget* ) const;

        QRect genericLayoutItemRect( const QStyleOption*, const QWidget* ) const;

        //@}

        //*@name subcontrol Rect specialized functions

        //@{

        QRect groupBoxSubControlRect( const QStyleOptionComplex*, SubControl, const QWidget* ) const;

        QRect toolButtonSubControlRect( const QStyleOptionComplex*, SubControl, const QWidget* ) const;

        QRect comboBoxSubControlRect( const QStyleOptionComplex*, SubControl, const QWidget* ) const;

        QRect spinBoxSubControlRect( const QStyleOptionComplex*, SubControl, const QWidget* ) const;

        QRect scrollBarInternalSubControlRect( const QStyleOptionComplex*, SubControl ) const;

        QRect scrollBarSubControlRect( const QStyleOptionComplex*, SubControl, const QWidget* ) const;

        QRect dialSubControlRect( const QStyleOptionComplex*, SubControl, const QWidget* ) const;

        QRect sliderSubControlRect( const QStyleOptionComplex*, SubControl, const QWidget* ) const;

        //@}

        //*@name sizeFromContents

        //@{

        QSize defaultSizeFromContents( const QStyleOption*, const QSize& size, const QWidget* ) const

        { return size; }

        QSize checkBoxSizeFromContents( const QStyleOption*, const QSize&, const QWidget* ) const;

        QSize lineEditSizeFromContents( const QStyleOption*, const QSize&, const QWidget* ) const;

        QSize comboBoxSizeFromContents( const QStyleOption*, const QSize&, const QWidget* ) const;

        QSize spinBoxSizeFromContents( const QStyleOption*, const QSize&, const QWidget* ) const;

        QSize sliderSizeFromContents( const QStyleOption*, const QSize&, const QWidget* ) const;

        QSize pushButtonSizeFromContents( const QStyleOption*, const QSize&, const QWidget* ) const;

        QSize toolButtonSizeFromContents( const QStyleOption*, const QSize&, const QWidget* ) const;

        QSize menuBarItemSizeFromContents( const QStyleOption*, const QSize&, const QWidget* ) const;

        QSize menuItemSizeFromContents( const QStyleOption*, const QSize&, const QWidget* ) const;

        QSize progressBarSizeFromContents( const QStyleOption*, const QSize&, const QWidget* ) const;

        QSize tabWidgetSizeFromContents( const QStyleOption*, const QSize&, const QWidget* ) const;

        QSize tabBarTabSizeFromContents( const QStyleOption*, const QSize&, const QWidget* ) const;

        QSize headerSectionSizeFromContents( const QStyleOption*, const QSize&, const QWidget* ) const;

        QSize itemViewItemSizeFromContents( const QStyleOption*, const QSize&, const QWidget* ) const;

        //@}

        //*@name primitives specialized functions

        //@{

        bool emptyPrimitive( const QStyleOption*, QPainter*, const QWidget* ) const

        { return true; }

        bool drawFramePrimitive( const QStyleOption*, QPainter*, const QWidget* ) const;

        bool drawFrameLineEditPrimitive( const QStyleOption*, QPainter*, const QWidget* ) const;

        bool drawFrameFocusRectPrimitive( const QStyleOption*, QPainter*, const QWidget* ) const;

        bool drawFrameMenuPrimitive( const QStyleOption*, QPainter*, const QWidget* ) const;

        bool drawFrameGroupBoxPrimitive( const QStyleOption*, QPainter*, const QWidget* ) const;

        bool drawFrameTabWidgetPrimitive( const QStyleOption*, QPainter*, const QWidget* ) const;

        bool drawFrameTabBarBasePrimitive( const QStyleOption*, QPainter*, const QWidget* ) const;

        bool drawFrameWindowPrimitive( const QStyleOption*, QPainter*, const QWidget* ) const;

        bool drawIndicatorArrowUpPrimitive( const QStyleOption* option, QPainter* painter, const QWidget* widget ) const

        { return drawIndicatorArrowPrimitive( ArrowUp, option, painter, widget ); }

        bool drawIndicatorArrowDownPrimitive( const QStyleOption* option, QPainter* painter, const QWidget* widget ) const

        { return drawIndicatorArrowPrimitive( ArrowDown, option, painter, widget ); }

        bool drawIndicatorArrowLeftPrimitive( const QStyleOption* option, QPainter* painter, const QWidget* widget ) const

        { return drawIndicatorArrowPrimitive( ArrowLeft, option, painter, widget ); }

        bool drawIndicatorArrowRightPrimitive( const QStyleOption* option, QPainter* painter, const QWidget* widget ) const

        { return drawIndicatorArrowPrimitive( ArrowRight, option, painter, widget ); }

        bool drawIndicatorArrowPrimitive( ArrowOrientation, const QStyleOption*, QPainter*, const QWidget* ) const;

        bool drawIndicatorHeaderArrowPrimitive( const QStyleOption*, QPainter*, const QWidget* ) const;

        bool drawPanelButtonCommandPrimitive( const QStyleOption*, QPainter*, const QWidget* ) const;

        bool drawPanelButtonToolPrimitive( const QStyleOption*, QPainter*, const QWidget* ) const;

        bool drawTabBarPanelButtonToolPrimitive( const QStyleOption*, QPainter*, const QWidget* ) const;

        bool drawPanelScrollAreaCornerPrimitive( const QStyleOption*, QPainter*, const QWidget* ) const;

        bool drawPanelMenuPrimitive( const QStyleOption*, QPainter*, const QWidget* ) const;

        bool drawPanelTipLabelPrimitive( const QStyleOption*, QPainter*, const QWidget* ) const;

        bool drawPanelItemViewItemPrimitive( const QStyleOption*, QPainter*, const QWidget* ) const;

        bool drawIndicatorCheckBoxPrimitive( const QStyleOption*, QPainter*, const QWidget* ) const;

        bool drawIndicatorRadioButtonPrimitive( const QStyleOption*, QPainter*, const QWidget* ) const;

        bool drawIndicatorButtonDropDownPrimitive( const QStyleOption*, QPainter*, const QWidget* ) const;

        bool drawIndicatorTabClosePrimitive( const QStyleOption*, QPainter* painter, const QWidget* widget ) const;

        bool drawIndicatorTabTearPrimitive( const QStyleOption*, QPainter*, const QWidget* ) const;

        bool drawIndicatorToolBarHandlePrimitive( const QStyleOption*, QPainter*, const QWidget* ) const;

        bool drawIndicatorToolBarSeparatorPrimitive( const QStyleOption*, QPainter*, const QWidget* ) const;

        bool drawIndicatorBranchPrimitive( const QStyleOption*, QPainter*, const QWidget* ) const;

        //@}

        //*@name controls specialized functions

        //@{

        bool emptyControl( const QStyleOption*, QPainter*, const QWidget* ) const

        { return true; }

        virtual bool drawPushButtonLabelControl( const QStyleOption*, QPainter*, const QWidget* ) const;

        virtual bool drawToolButtonLabelControl( const QStyleOption*, QPainter*, const QWidget* ) const;

        virtual bool drawCheckBoxLabelControl( const QStyleOption*, QPainter*, const QWidget* ) const;

        virtual bool drawComboBoxLabelControl( const QStyleOption*, QPainter*, const QWidget* ) const;

        virtual bool drawMenuBarEmptyArea( const QStyleOption*, QPainter* , const QWidget*) const;

        virtual bool drawMenuBarItemControl( const QStyleOption*, QPainter*, const QWidget* ) const;

        virtual bool drawMenuEmptyAreaControl( const QStyleOption*, QPainter* , const QWidget*) const;

        virtual bool drawMenuItemControl( const QStyleOption*, QPainter*, const QWidget* ) const;

        virtual bool drawProgressBarControl( const QStyleOption*, QPainter*, const QWidget* ) const;

        virtual bool drawProgressBarContentsControl( const QStyleOption*, QPainter*, const QWidget* ) const;

        virtual bool drawProgressBarGrooveControl( const QStyleOption*, QPainter*, const QWidget* ) const;

        virtual bool drawProgressBarLabelControl( const QStyleOption*, QPainter*, const QWidget* ) const;

        virtual bool drawScrollBarSliderControl( const QStyleOption*, QPainter*, const QWidget* ) const;

        virtual bool drawScrollBarAddLineControl( const QStyleOption*, QPainter*, const QWidget* ) const;

        virtual bool drawScrollBarSubLineControl( const QStyleOption*, QPainter*, const QWidget* ) const;

        virtual bool drawShapedFrameControl( const QStyleOption*, QPainter*, const QWidget* ) const;

        virtual bool drawRubberBandControl( const QStyleOption*, QPainter*, const QWidget* ) const;

        virtual bool drawHeaderSectionControl( const QStyleOption*, QPainter*, const QWidget* ) const;

        virtual bool drawHeaderLabelControl( const QStyleOption*, QPainter*, const QWidget* ) const;

        virtual bool drawHeaderEmptyAreaControl( const QStyleOption*, QPainter*, const QWidget* ) const;

        virtual bool drawTabBarTabLabelControl( const QStyleOption*, QPainter*, const QWidget* ) const;

        virtual bool drawTabBarTabShapeControl( const QStyleOption*, QPainter*, const QWidget* ) const;

        virtual bool drawToolBoxTabLabelControl( const QStyleOption*, QPainter*, const QWidget* ) const;

        virtual bool drawToolBoxTabShapeControl( const QStyleOption*, QPainter*, const QWidget* ) const;

        virtual bool drawDockWidgetTitleControl( const QStyleOption*, QPainter*, const QWidget* ) const;

        //*@}

        //*@name complex ontrols specialized functions

        //@{

        bool drawGroupBoxComplexControl( const QStyleOptionComplex*, QPainter*, const QWidget* ) const;

        bool drawToolButtonComplexControl( const QStyleOptionComplex*, QPainter*, const QWidget* ) const;

        bool drawComboBoxComplexControl( const QStyleOptionComplex*, QPainter*, const QWidget* ) const;

        bool drawSpinBoxComplexControl( const QStyleOptionComplex*, QPainter*, const QWidget* ) const;

        bool drawSliderComplexControl( const QStyleOptionComplex*, QPainter*, const QWidget* ) const;

        bool drawDialComplexControl( const QStyleOptionComplex*, QPainter*, const QWidget* ) const;

        bool drawScrollBarComplexControl( const QStyleOptionComplex*, QPainter*, const QWidget* ) const;

        bool drawTitleBarComplexControl( const QStyleOptionComplex*, QPainter*, const QWidget* ) const;

        //@}

        //!*@name various utilty functions

        //@{

        //* spinbox arrows

        void renderSpinBoxArrow( const SubControl&, const QStyleOptionSpinBox*, QPainter*, const QWidget*) const;

        //* menu title

        void renderMenuTitle( const QStyleOptionToolButton*, QPainter*, const QWidget* ) const;

        //* return dial angle based on option and value

        qreal dialAngle( const QStyleOptionSlider*, int ) const;

        //* returns relevant scrollbar parent

        /** needed to detect parent focus */

        const QWidget* scrollBarParent( const QWidget* ) const;

        //* returns true if given scrollbar arrow is animated

        QColor scrollBarArrowColor( const QStyleOptionSlider*, const SubControl&, const QWidget* ) const;

        //* scrollbar buttons

        enum ScrollBarButtonType

        {

            NoButton,

            SingleButton,

            DoubleButton

        };

        //* returns height for scrollbar buttons depending of button types

        int scrollBarButtonHeight( const ScrollBarButtonType& type ) const

        {

            switch( type )

            {

                case NoButton: return Metrics::ScrollBar_NoButtonHeight;

                case SingleButton: return Metrics::ScrollBar_SingleButtonHeight;

                case DoubleButton: return Metrics::ScrollBar_DoubleButtonHeight;

                default: return 0;

            }

        }

        //@}

        //* translucent background

        void setTranslucentBackground( QWidget* ) const;

        /**

        separator can have a title and an icon

        in that case they are rendered as sunken flat toolbuttons

        return toolbutton option that matches named separator menu items

        */

        QStyleOptionToolButton separatorMenuItemOption( const QStyleOptionMenuItem*, const QWidget* ) const;

        //* create toolbar extension icon

        QIcon toolBarExtensionIcon( StandardPixmap, const QStyleOption*, const QWidget* ) const;

        //* create title bar button icon

        QIcon titleBarButtonIcon( StandardPixmap, const QStyleOption*, const QWidget* ) const;

        //* returns item view parent if any

        /** needed to have correct color on focused checkboxes and radiobuttons */

        const QAbstractItemView* itemViewParent( const QWidget* ) const;

        //* returns true if a given widget is a selected item in a focused list

        /**

        This is necessary to have the correct colors used for e.g. checkboxes and radiobuttons in lists

        @param widget The widget to be checked

        @param position Used to find the relevant QModelIndex

        */

        bool isSelectedItem( const QWidget*, const QPoint& ) const;

        //* return true if option corresponds to QtQuick control

        bool isQtQuickControl( const QStyleOption*, const QWidget* ) const;

        //@}

        //* adjust rect based on provided margins

        QRect insideMargin( const QRect& r, int margin ) const

        { return insideMargin( r, margin, margin ); }

        //* adjust rect based on provided margins

        QRect insideMargin( const QRect& r, int marginWidth, int marginHeight ) const

        { return r.adjusted( marginWidth, marginHeight, -marginWidth, -marginHeight ); }

        //* expand size based on margins

        QSize expandSize( const QSize& size, int margin ) const

        { return expandSize( size, margin, margin ); }

        //* expand size based on margins

        QSize expandSize( const QSize& size, int marginWidth, int marginHeight ) const

        { return size + 2*QSize( marginWidth, marginHeight ); }

        //* returns true for vertical tabs

        bool isVerticalTab( const QStyleOptionTab* option ) const

        { return isVerticalTab( option->shape ); }

        bool isVerticalTab( const QTabBar::Shape& shape ) const

        {

            return shape == QTabBar::RoundedEast

                || shape == QTabBar::RoundedWest

                || shape == QTabBar::TriangularEast

                || shape == QTabBar::TriangularWest;

        }

        //* right to left alignment handling

        using ParentStyleClass::visualRect;

        QRect visualRect(const QStyleOption* opt, const QRect& subRect) const

        { return ParentStyleClass::visualRect(opt->direction, opt->rect, subRect); }

        //* centering

        QRect centerRect(const QRect &rect, const QSize& size ) const

        { return centerRect( rect, size.width(), size.height() ); }

        QRect centerRect(const QRect &rect, int width, int height) const

        { return QRect(rect.left() + (rect.width() - width)/2, rect.top() + (rect.height() - height)/2, width, height); }

        /*

        Checks whether the point is before the bound rect for bound of given orientation.

        This is needed to implement custom number of buttons in scrollbars,

        as well as proper mouse-hover

        */

        inline bool preceeds( const QPoint&, const QRect&, const QStyleOption* ) const;

        //* return which arrow button is hit by point for scrollbar double buttons

        inline QStyle::SubControl scrollBarHitTest( const QRect&, const QPoint&, const QStyleOption* ) const;

        //! return true if one of the widget's parent inherits requested type

        inline bool hasParent( const QWidget*, const char* ) const;

        //* return true if one of the widget's parent inherits requested type

        template<typename T> bool hasParent( const QWidget* ) const;

        //* return true if icons should be shown in menus

        bool showIconsInMenuItems( void ) const;

        //* return true if icons should be shown on buttons

        bool showIconsOnPushButtons( void ) const;

        //* return true if passed widget is a menu title (KMenu::addTitle)

        bool isMenuTitle( const QWidget* ) const;

        //* return true if passed widget is a menu title (KMenu::addTitle)

        bool hasAlteredBackground( const QWidget* ) const;

        private:

        //*@name scrollbar button types (for addLine and subLine )

        //@{

        ScrollBarButtonType _addLineButtons;

        ScrollBarButtonType _subLineButtons;

        //@}

        //* helper

        Helper* _helper;

        //* animations

        Animations* _animations;

        //* keyboard accelerators

        Mnemonics* _mnemonics;

        //* window manager

        WindowManager* _windowManager;

        //* splitter Factory, to extend splitters hit area

        SplitterFactory* _splitterFactory;

        //* widget explorer

        WidgetExplorer* _widgetExplorer;

        //* tabbar data

        AdwaitaPrivate::TabBarData* _tabBarData;

        //* icon hash

        using IconCache = QHash<StandardPixmap, QIcon>;

        IconCache _iconCache;

        //* pointer to primitive specialized function

        using StylePrimitive = bool(Style::*)(const QStyleOption*, QPainter*, const QWidget* ) const;

        StylePrimitive _frameFocusPrimitive = nullptr;

        //* pointer to control specialized function

        using StyleControl = bool (Style::*)( const QStyleOption*, QPainter*, const QWidget* ) const;

        //* pointer to control specialized function

        using StyleComplexControl = bool (Style::*)( const QStyleOptionComplex*, QPainter*, const QWidget* ) const;

        //*@name custom elements

        //@{

        //* use Argb Drag and Drop Window

        QStyle::StyleHint SH_ArgbDndWindow;

        //! styled painting for KCapacityBar

        QStyle::ControlElement CE_CapacityBar;

        bool _dark { false };

        bool _isGNOME { false };

        bool _isKDE { false };

        //@}

    };

    //_________________________________________________________________________

    bool Style::preceeds( const QPoint& point, const QRect& bound, const QStyleOption* option ) const

    {

        if( option->state&QStyle::State_Horizontal)

        {

            if( option->direction == Qt::LeftToRight) return point.x() < bound.right();

            else return point.x() > bound.x();

        } else return point.y() < bound.y();

    }

    //_________________________________________________________________________

    QStyle::SubControl Style::scrollBarHitTest( const QRect& rect, const QPoint& point, const QStyleOption* option ) const

    {

        if( option->state & QStyle::State_Horizontal)

        {

            if( option->direction == Qt::LeftToRight ) return point.x() < rect.center().x() ? QStyle::SC_ScrollBarSubLine : QStyle::SC_ScrollBarAddLine;

            else return point.x() > rect.center().x() ? QStyle::SC_ScrollBarSubLine : QStyle::SC_ScrollBarAddLine;

        } else return point.y() < rect.center().y() ? QStyle::SC_ScrollBarSubLine : QStyle::SC_ScrollBarAddLine;

    }

    //_________________________________________________________________________

    bool Style::hasParent( const QWidget* widget, const char* className ) const

    {

        if( !widget ) return false;

        while( (widget = widget->parentWidget()) )

        { if( widget->inherits( className ) ) return true; }

        return false;

    }

    //_________________________________________________________________________

    template< typename T > bool Style::hasParent( const QWidget* widget ) const

    {

        if( !widget ) return false;

        while( (widget = widget->parentWidget()) )

        { if( qobject_cast<const T*>( widget ) ) return true; }

        return false;

    }

}

#endif