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Diffstat (limited to 'src/gui/styles/qproxystyle.cpp')
| -rw-r--r-- | src/gui/styles/qproxystyle.cpp | 420 |
1 files changed, 420 insertions, 0 deletions
diff --git a/src/gui/styles/qproxystyle.cpp b/src/gui/styles/qproxystyle.cpp new file mode 100644 index 0000000..50904b1 --- /dev/null +++ b/src/gui/styles/qproxystyle.cpp @@ -0,0 +1,420 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the QtGui module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the Technology Preview License Agreement accompanying +** this package. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain +** additional rights. These rights are described in the Nokia Qt LGPL +** Exception version 1.1, included in the file LGPL_EXCEPTION.txt in this +** package. +** +** If you have questions regarding the use of this file, please contact +** Nokia at qt-info@nokia.com. +** +** +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#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 |