norwegianwoodstyle.cpp Example File
^{widgets/styles/norwegianwoodstyle.cpp}

 /****************************************************************************
 **
 ** Copyright (C) 2005-2008 Trolltech ASA. All rights reserved.
 **
 ** This file is part of the documentation of the Qt Toolkit.
 **
 ** This file may be used under the terms of the GNU General Public
** License versions 2.0 or 3.0 as published by the Free Software
** Foundation and appearing in the files LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file.  Alternatively you may (at
** your option) use any later version of the GNU General Public
** License if such license has been publicly approved by Trolltech ASA
** (or its successors, if any) and the KDE Free Qt Foundation. In
** addition, as a special exception, Trolltech gives you certain
** additional rights. These rights are described in the Trolltech GPL
** Exception version 1.2, which can be found at
** http://www.trolltech.com/products/qt/gplexception/ and in the file
** GPL_EXCEPTION.txt in this package.
**
** Please review the following information to ensure GNU General
** Public Licensing requirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/. If
** you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at sales@trolltech.com.
**
** In addition, as a special exception, Trolltech, as the sole
** copyright holder for Qt Designer, grants users of the Qt/Eclipse
** Integration plug-in the right for the Qt/Eclipse Integration to
** link to functionality provided by Qt Designer and its related
** libraries.
**
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE. Trolltech reserves all rights not expressly
** granted herein.
 **
 ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 **
 ****************************************************************************/

 #include <QtGui>

 #include "norwegianwoodstyle.h"

 void NorwegianWoodStyle::polish(QPalette &palette)
 {
     QColor brown(212, 140, 95);
     QColor beige(236, 182, 120);
     QColor slightlyOpaqueBlack(0, 0, 0, 63);

     QPixmap backgroundImage(":/images/woodbackground.png");
     QPixmap buttonImage(":/images/woodbutton.png");
     QPixmap midImage = buttonImage;

     QPainter painter;
     painter.begin(&midImage);
     painter.setPen(Qt::NoPen);
     painter.fillRect(midImage.rect(), slightlyOpaqueBlack);
     painter.end();

     palette = QPalette(brown);

     palette.setBrush(QPalette::BrightText, Qt::white);
     palette.setBrush(QPalette::Base, beige);
     palette.setBrush(QPalette::Highlight, Qt::darkGreen);
     setTexture(palette, QPalette::Button, buttonImage);
     setTexture(palette, QPalette::Mid, midImage);
     setTexture(palette, QPalette::Window, backgroundImage);

     QBrush brush = palette.background();
     brush.setColor(brush.color().dark());

     palette.setBrush(QPalette::Disabled, QPalette::WindowText, brush);
     palette.setBrush(QPalette::Disabled, QPalette::Text, brush);
     palette.setBrush(QPalette::Disabled, QPalette::ButtonText, brush);
     palette.setBrush(QPalette::Disabled, QPalette::Base, brush);
     palette.setBrush(QPalette::Disabled, QPalette::Button, brush);
     palette.setBrush(QPalette::Disabled, QPalette::Mid, brush);
 }

 void NorwegianWoodStyle::polish(QWidget *widget)
 {
     if (qobject_cast<QPushButton *>(widget)
             || qobject_cast<QComboBox *>(widget))
         widget->setAttribute(Qt::WA_Hover, true);
 }

 void NorwegianWoodStyle::unpolish(QWidget *widget)
 {
     if (qobject_cast<QPushButton *>(widget)
             || qobject_cast<QComboBox *>(widget))
         widget->setAttribute(Qt::WA_Hover, false);
 }

 int NorwegianWoodStyle::pixelMetric(PixelMetric metric,
                                     const QStyleOption *option,
                                     const QWidget *widget) const
 {
     switch (metric) {
     case PM_ComboBoxFrameWidth:
         return 8;
     case PM_ScrollBarExtent:
         return QMotifStyle::pixelMetric(metric, option, widget) + 4;
     default:
         return QMotifStyle::pixelMetric(metric, option, widget);
     }
 }

 int NorwegianWoodStyle::styleHint(StyleHint hint, const QStyleOption *option,
                                   const QWidget *widget,
                                   QStyleHintReturn *returnData) const
 {
     switch (hint) {
     case SH_DitherDisabledText:
         return int(false);
     case SH_EtchDisabledText:
         return int(true);
     default:
         return QMotifStyle::styleHint(hint, option, widget, returnData);
     }
 }

 void NorwegianWoodStyle::drawPrimitive(PrimitiveElement element,
                                        const QStyleOption *option,
                                        QPainter *painter,
                                        const QWidget *widget) const
 {
     switch (element) {
     case PE_PanelButtonCommand:
         {
             int delta = (option->state & State_MouseOver) ? 64 : 0;
             QColor slightlyOpaqueBlack(0, 0, 0, 63);
             QColor semiTransparentWhite(255, 255, 255, 127 + delta);
             QColor semiTransparentBlack(0, 0, 0, 127 - delta);

             int x, y, width, height;
             option->rect.getRect(&x, &y, &width, &height);

             QPainterPath roundRect = roundRectPath(option->rect);
             int radius = qMin(width, height) / 2;

             QBrush brush;
             bool darker;

             const QStyleOptionButton *buttonOption =
                     qstyleoption_cast<const QStyleOptionButton *>(option);
             if (buttonOption
                     && (buttonOption->features & QStyleOptionButton::Flat)) {
                 brush = option->palette.background();
                 darker = (option->state & (State_Sunken | State_On));
             } else {
                 if (option->state & (State_Sunken | State_On)) {
                     brush = option->palette.mid();
                     darker = !(option->state & State_Sunken);
                 } else {
                     brush = option->palette.button();
                     darker = false;
                 }
             }

             painter->save();
             painter->setRenderHint(QPainter::Antialiasing, true);
             painter->fillPath(roundRect, brush);
             if (darker)
                 painter->fillPath(roundRect, slightlyOpaqueBlack);

             int penWidth;
             if (radius < 10)
                 penWidth = 3;
             else if (radius < 20)
                 penWidth = 5;
             else
                 penWidth = 7;

             QPen topPen(semiTransparentWhite, penWidth);
             QPen bottomPen(semiTransparentBlack, penWidth);

             if (option->state & (State_Sunken | State_On))
                 qSwap(topPen, bottomPen);

             int x1 = x;
             int x2 = x + radius;
             int x3 = x + width - radius;
             int x4 = x + width;

             if (option->direction == Qt::RightToLeft) {
                 qSwap(x1, x4);
                 qSwap(x2, x3);
             }

             QPolygon topHalf;
             topHalf << QPoint(x1, y)
                     << QPoint(x4, y)
                     << QPoint(x3, y + radius)
                     << QPoint(x2, y + height - radius)
                     << QPoint(x1, y + height);

             painter->setClipPath(roundRect);
             painter->setClipRegion(topHalf, Qt::IntersectClip);
             painter->setPen(topPen);
             painter->drawPath(roundRect);

             QPolygon bottomHalf = topHalf;
             bottomHalf[0] = QPoint(x4, y + height);

             painter->setClipPath(roundRect);
             painter->setClipRegion(bottomHalf, Qt::IntersectClip);
             painter->setPen(bottomPen);
             painter->drawPath(roundRect);

             painter->setPen(option->palette.foreground().color());
             painter->setClipping(false);
             painter->drawPath(roundRect);

             painter->restore();
         }
         break;
     default:
         QMotifStyle::drawPrimitive(element, option, painter, widget);
     }
 }

 void NorwegianWoodStyle::drawControl(ControlElement element,
                                      const QStyleOption *option,
                                      QPainter *painter,
                                      const QWidget *widget) const
 {
     switch (element) {
     case CE_PushButtonLabel:
         {
             QStyleOptionButton myButtonOption;
             const QStyleOptionButton *buttonOption =
                     qstyleoption_cast<const QStyleOptionButton *>(option);
             if (buttonOption) {
                 myButtonOption = *buttonOption;
                 if (myButtonOption.palette.currentColorGroup()
                         != QPalette::Disabled) {
                     if (myButtonOption.state & (State_Sunken | State_On)) {
                         myButtonOption.palette.setBrush(QPalette::ButtonText,
                                 myButtonOption.palette.brightText());
                     }
                 }
             }
             QMotifStyle::drawControl(element, &myButtonOption, painter, widget);
         }
         break;
     default:
         QMotifStyle::drawControl(element, option, painter, widget);
     }
 }

 void NorwegianWoodStyle::setTexture(QPalette &palette, QPalette::ColorRole role,
                                     const QPixmap &pixmap)
 {
     for (int i = 0; i < QPalette::NColorGroups; ++i) {
         QColor color = palette.brush(QPalette::ColorGroup(i), role).color();
         palette.setBrush(QPalette::ColorGroup(i), role, QBrush(color, pixmap));
     }
 }

 QPainterPath NorwegianWoodStyle::roundRectPath(const QRect &rect)
 {
     int radius = qMin(rect.width(), rect.height()) / 2;
     int diam = 2 * radius;

     int x1, y1, x2, y2;
     rect.getCoords(&x1, &y1, &x2, &y2);

     QPainterPath path;
     path.moveTo(x2, y1 + radius);
     path.arcTo(QRect(x2 - diam, y1, diam, diam), 0.0, +90.0);
     path.lineTo(x1 + radius, y1);
     path.arcTo(QRect(x1, y1, diam, diam), 90.0, +90.0);
     path.lineTo(x1, y2 - radius);
     path.arcTo(QRect(x1, y2 - diam, diam, diam), 180.0, +90.0);
     path.lineTo(x1 + radius, y2);
     path.arcTo(QRect(x2 - diam, y2 - diam, diam, diam), 270.0, +90.0);
     path.closeSubpath();
     return path;
 }