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#include <qstyle.h>

#include <private/qstyle_p.h>

#include <private/qproxystyle_p.h>

#include <private/qapplication_p.h>

#include "qproxystyle.h"

#include "qstylefactory.h"

#if !defined(QT_NO_STYLE_PROXY) || defined(QT_PLUGIN)

QT_BEGIN_NAMESPACE

/*!

    \class QProxyStyle

    \brief The QProxyStyle class is a convenience class that simplifies

    dynamically overriding QStyle elements.

    \since 4.6

    A QProxyStyle wraps a QStyle (usually the default system style) for the

    purpose of dynamically overriding painting or other specific style behavior.

    The following example shows how to override the shortcut underline

    behavior on any platform:

    \snippet doc/src/snippets/code/src_gui_qproxystyle.cpp 1

    Warning: The \l {QCommonStyle} {common styles} provided by Qt will

    respect this hint, because they call QStyle::proxy(), but there is

    no guarantee that QStyle::proxy() will be called for user defined

    or system controlled styles. It would not work on a Mac, for

    example, where menus are handled by the operating system.

    \sa QStyle

*/

void QProxyStylePrivate::ensureBaseStyle() const

{

    Q_Q(const QProxyStyle);

    if (baseStyle)

        return;

    if (!baseStyle && !QApplicationPrivate::styleOverride.isEmpty()) {

        baseStyle = QStyleFactory::create(QApplicationPrivate::styleOverride);

        if (baseStyle) {

            // If baseStyle is an instance of the same proxyStyle

            // we destroy it and fall back to the desktop style

            if (qstrcmp(baseStyle->metaObject()->className(),

                        q->metaObject()->className()) == 0) {

                delete baseStyle;

                baseStyle = 0;

            }

        }

    }

    if (!baseStyle) // Use application desktop style

        baseStyle = QStyleFactory::create(QApplicationPrivate::desktopStyleKey());

    if (!baseStyle) // Fallback to windows style

        baseStyle = QStyleFactory::create(QLatin1String("windows"));

    baseStyle->setProxy(const_cast<QProxyStyle*>(q));

    baseStyle->setParent(const_cast<QProxyStyle*>(q)); // Take ownership

}

/*!

  Constructs a QProxyStyle object for overriding behavior in \a style

  or in the current application \l{QStyle}{style} if \a style is 0

  (default). Normally \a style is 0, because you want to override

  behavior in the system style.

  Ownership of \a style is transferred to QProxyStyle.

*/

QProxyStyle::QProxyStyle(QStyle *style) :

    QCommonStyle(*new QProxyStylePrivate())

{

    Q_D(QProxyStyle);

    if (style) {

        style->setProxy(this);

        style->setParent(this); // Take ownership

        d->baseStyle = style;

    }

}

/*!

    Destroys the QProxyStyle object.

*/

QProxyStyle::~QProxyStyle()

{

}

/*!

    Returns the proxy base style object. If no base style

    is set on the proxy style, QProxyStyle will create

    an instance of the application style instead.

    \sa setBaseStyle(), QStyle

*/

QStyle *QProxyStyle::baseStyle() const

{

    Q_D (const QProxyStyle);

    d->ensureBaseStyle();

    return d->baseStyle;

}

/*!

    Sets the base style that should be proxied.

    Ownership of \a style is transferred to QProxyStyle.

    If style is zero, a desktop-dependant style will be

    assigned automatically.

*/

void QProxyStyle::setBaseStyle(QStyle *style)

{

    Q_D (QProxyStyle);

    if (d->baseStyle && d->baseStyle->parent() == this)

        d->baseStyle->deleteLater();

    d->baseStyle = style;

    if (d->baseStyle) {

        d->baseStyle->setProxy(this);

        d->baseStyle->setParent(this);

    }

}

/*! \reimp

 */

void QProxyStyle::drawPrimitive(PrimitiveElement element, const QStyleOption *option, QPainter *painter, const QWidget *widget) const

{

    Q_D (const QProxyStyle);

    d->ensureBaseStyle();

    d->baseStyle->drawPrimitive(element, option, painter, widget);

}

/*!

  \reimp

 */

void QProxyStyle::drawControl(ControlElement element, const QStyleOption *option, QPainter *painter, const QWidget *widget) const

{

    Q_D (const QProxyStyle);

    d->ensureBaseStyle();

    d->baseStyle->drawControl(element, option, painter, widget);

}

/*! \reimp

 */

void QProxyStyle::drawComplexControl(ComplexControl control, const QStyleOptionComplex *option, QPainter *painter, const QWidget *widget) const

{

    Q_D (const QProxyStyle);

    d->ensureBaseStyle();

    d->baseStyle->drawComplexControl(control, option, painter, widget);

}

/*! \reimp

 */

void QProxyStyle::drawItemText(QPainter *painter, const QRect &rect, int flags, const QPalette &pal, bool enabled,

                               const QString &text, QPalette::ColorRole textRole) const

{

    Q_D (const QProxyStyle);

    d->ensureBaseStyle();

    d->baseStyle->drawItemText(painter, rect, flags, pal, enabled, text, textRole);

}

/*! \reimp

 */

void QProxyStyle::drawItemPixmap(QPainter *painter, const QRect &rect, int alignment, const QPixmap &pixmap) const

{

    Q_D (const QProxyStyle);

    d->ensureBaseStyle();

    d->baseStyle->drawItemPixmap(painter, rect, alignment, pixmap);

}

/*! \reimp

 */

QSize QProxyStyle::sizeFromContents(ContentsType type, const QStyleOption *option, const QSize &size, const QWidget *widget) const

{

    Q_D (const QProxyStyle);

    d->ensureBaseStyle();

    return d->baseStyle->sizeFromContents(type, option, size, widget);

}

/*! \reimp

 */

QRect QProxyStyle::subElementRect(SubElement element, const QStyleOption *option, const QWidget *widget) const

{

    Q_D (const QProxyStyle);

    d->ensureBaseStyle();

    return d->baseStyle->subElementRect(element, option, widget);

}

/*! \reimp

 */

QRect QProxyStyle::subControlRect(ComplexControl cc, const QStyleOptionComplex *option, SubControl sc, const QWidget *widget) const

{

    Q_D (const QProxyStyle);

    d->ensureBaseStyle();

    return d->baseStyle->subControlRect(cc, option, sc, widget);

}

/*! \reimp

 */

QRect QProxyStyle::itemTextRect(const QFontMetrics &fm, const QRect &r, int flags, bool enabled, const QString &text) const

{

    Q_D (const QProxyStyle);

    d->ensureBaseStyle();

    return d->baseStyle->itemTextRect(fm, r, flags, enabled, text);

}

/*! \reimp

 */

QRect QProxyStyle::itemPixmapRect(const QRect &r, int flags, const QPixmap &pixmap) const

{

    Q_D (const QProxyStyle);

    d->ensureBaseStyle();

    return d->baseStyle->itemPixmapRect(r, flags, pixmap);

}

/*! \reimp

 */

QStyle::SubControl QProxyStyle::hitTestComplexControl(ComplexControl control, const QStyleOptionComplex *option, const QPoint &pos, const QWidget *widget) const

{

    Q_D (const QProxyStyle);

    d->ensureBaseStyle();

    return d->baseStyle->hitTestComplexControl(control, option, pos, widget);

}

/*! \reimp

 */

int QProxyStyle::styleHint(StyleHint hint, const QStyleOption *option, const QWidget *widget, QStyleHintReturn *returnData) const

{

    Q_D (const QProxyStyle);

    d->ensureBaseStyle();

    return d->baseStyle->styleHint(hint, option, widget, returnData);

}

/*! \reimp

 */

int QProxyStyle::pixelMetric(PixelMetric metric, const QStyleOption *option, const QWidget *widget) const

{

    Q_D (const QProxyStyle);

    d->ensureBaseStyle();

    return d->baseStyle->pixelMetric(metric, option, widget);

}

/*! \reimp

 */

QPixmap QProxyStyle::standardPixmap(StandardPixmap standardPixmap, const QStyleOption *opt, const QWidget *widget) const

{

    Q_D (const QProxyStyle);

    d->ensureBaseStyle();

    return d->baseStyle->standardPixmap(standardPixmap, opt, widget);

}

/*! \reimp

 */

QPixmap QProxyStyle::generatedIconPixmap(QIcon::Mode iconMode, const QPixmap &pixmap, const QStyleOption *opt) const

{

    Q_D (const QProxyStyle);

    d->ensureBaseStyle();

    return d->baseStyle->generatedIconPixmap(iconMode, pixmap, opt);

}

/*! \reimp

 */

QPalette QProxyStyle::standardPalette() const

{

    Q_D (const QProxyStyle);

    d->ensureBaseStyle();

    return d->baseStyle->standardPalette();

}

/*! \reimp

 */

void QProxyStyle::polish(QWidget *widget)

{

    Q_D (QProxyStyle);

    d->ensureBaseStyle();

    d->baseStyle->polish(widget);

}

/*! \reimp

 */

void QProxyStyle::polish(QPalette &pal)

{

    Q_D (QProxyStyle);

    d->ensureBaseStyle();

    d->baseStyle->polish(pal);

}

/*! \reimp

 */

void QProxyStyle::polish(QApplication *app)

{

    Q_D (QProxyStyle);

    d->ensureBaseStyle();

    d->baseStyle->polish(app);

}

/*! \reimp

 */

void QProxyStyle::unpolish(QWidget *widget)

{

    Q_D (QProxyStyle);

    d->ensureBaseStyle();

    d->baseStyle->unpolish(widget);

}

/*! \reimp

 */

void QProxyStyle::unpolish(QApplication *app)

{

    Q_D (QProxyStyle);

    d->ensureBaseStyle();

    d->baseStyle->unpolish(app);

}

/*! \reimp

 */

bool QProxyStyle::event(QEvent *e)

{

    Q_D (QProxyStyle);

    d->ensureBaseStyle();

    return d->baseStyle->event(e);

}

/*!

  Returns an icon for the given \a standardIcon.

  Reimplement this slot to provide your own icons in a QStyle

  subclass. The \a option argument can be used to pass extra

  information required to find the appropriate icon. The \a widget

  argument is optional and can also be used to help find the icon.

  \note Because of binary compatibility constraints, standardIcon()

  introduced in Qt 4.1 is not virtual. Therefore it must dynamically

  detect and call \e this slot.  This default implementation simply

  calls standardIcon() with the given parameters.

  \sa standardIcon()

 */

QIcon QProxyStyle::standardIconImplementation(StandardPixmap standardIcon,

                                              const QStyleOption *option,

                                              const QWidget *widget) const

{

    Q_D (const QProxyStyle);

    d->ensureBaseStyle();

    return d->baseStyle->standardIcon(standardIcon, option, widget);

}

/*!

  This slot is called by layoutSpacing() to determine the spacing that

  should be used between \a control1 and \a control2 in a layout. \a

  orientation specifies whether the controls are laid out side by side

  or stacked vertically. The \a option parameter can be used to pass

  extra information about the parent widget.  The \a widget parameter

  is optional and can also be used if \a option is 0.

  The default implementation returns -1.

  \sa layoutSpacing(), combinedLayoutSpacing()

 */

int QProxyStyle::layoutSpacingImplementation(QSizePolicy::ControlType control1,

                                             QSizePolicy::ControlType control2,

                                             Qt::Orientation orientation,

                                             const QStyleOption *option,

                                             const QWidget *widget) const

{

    Q_D (const QProxyStyle);

    d->ensureBaseStyle();

    return d->baseStyle->layoutSpacing(control1, control2, orientation, option, widget);

}

QT_END_NAMESPACE

#endif // QT_NO_STYLE_PROXY