C++/Qt/QStyle

Материал из C\C++ эксперт
Перейти к: навигация, поиск

extends QStyle

<source lang="cpp"> /****************************************************************************

    • Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
    • All rights reserved.
    • Contact: Nokia Corporation (qt-info@nokia.com)
    • This file is part of the documentation of the Qt Toolkit.
    • $QT_BEGIN_LICENSE:LGPL$
    • Commercial Usage
    • Licensees holding valid Qt Commercial licenses may use this file in
    • accordance with the Qt Commercial License Agreement provided with the
    • Software or, alternatively, in accordance with the terms contained in
    • a written agreement between you and Nokia.
    • 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.
    • GNU General Public License Usage
    • Alternatively, this file may be used under the terms of the GNU
    • General Public License version 3.0 as published by the Free Software
    • Foundation and appearing in the file LICENSE.GPL included in the
    • packaging of this file. Please review the following information to
    • ensure the GNU General Public License version 3.0 requirements will be
    • met: http://www.gnu.org/copyleft/gpl.html.
    • If you have questions regarding the use of this file, please contact
    • Nokia at qt-info@nokia.com.
    • $QT_END_LICENSE$
                                                                                                                                                        • /
  1. include <QtGui>
  2. include <QApplication>

class MyPushButton : public QPushButton { public:

   MyPushButton(QWidget *parent = 0);
   void paintEvent(QPaintEvent *);

}; MyPushButton::MyPushButton(QWidget *parent)

   : QPushButton(parent)

{ }

void MyPushButton::paintEvent(QPaintEvent *) {

   QStyleOptionButton option;
   option.initFrom(this);
   option.state = isDown() ? QStyle::State_Sunken : QStyle::State_Raised;
   if (isDefault())
       option.features |= QStyleOptionButton::DefaultButton;
   option.text = text();
   option.icon = icon();
   QPainter painter(this);
   style()->drawControl(QStyle::CE_PushButton, &option, &painter, this);

}


class MyStyle : public QStyle { public:

   MyStyle();
   void drawPrimitive(PrimitiveElement element, const QStyleOption *option,
                      QPainter *painter, const QWidget *widget);

}; MyStyle::MyStyle() {

   QStyleOptionFrame *option;
   if (const QStyleOptionFrame *frameOption =
          qstyleoption_cast<const QStyleOptionFrame *>(option)) {
       QStyleOptionFrameV2 frameOptionV2(*frameOption);
       // draw the frame using frameOptionV2
   }
   if (const QStyleOptionProgressBar *progressBarOption =
          qstyleoption_cast<const QStyleOptionProgressBar *>(option)) {
       QStyleOptionProgressBarV2 progressBarV2(*progressBarOption);
       // draw the progress bar using progressBarV2
   }
   if (const QStyleOptionTab *tabOption =
          qstyleoption_cast<const QStyleOptionTab *>(option)) {
       QStyleOptionTabV2 tabV2(*tabOption);
       // draw the tab using tabV2
  }

}

void MyStyle::drawPrimitive(PrimitiveElement element,

                           const QStyleOption *option,
                           QPainter *painter,
                           const QWidget *widget)

{

   if (element == PE_FrameFocusRect) {
       const QStyleOptionFocusRect *focusRectOption =
               qstyleoption_cast<const QStyleOptionFocusRect *>(option);
       if (focusRectOption) {
           // ...
       }
   }
   // ...

}

int main(int argc, char *argv[]) {

   QApplication app(argc, argv);
   MyPushButton button;
   button.show();
   return app.exec();

}


 </source>


extends QStylePlugin

<source lang="cpp"> /****************************************************************************

    • Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
    • All rights reserved.
    • Contact: Nokia Corporation (qt-info@nokia.com)
    • This file is part of the documentation of the Qt Toolkit.
    • $QT_BEGIN_LICENSE:LGPL$
    • Commercial Usage
    • Licensees holding valid Qt Commercial licenses may use this file in
    • accordance with the Qt Commercial License Agreement provided with the
    • Software or, alternatively, in accordance with the terms contained in
    • a written agreement between you and Nokia.
    • 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.
    • GNU General Public License Usage
    • Alternatively, this file may be used under the terms of the GNU
    • General Public License version 3.0 as published by the Free Software
    • Foundation and appearing in the file LICENSE.GPL included in the
    • packaging of this file. Please review the following information to
    • ensure the GNU General Public License version 3.0 requirements will be
    • met: http://www.gnu.org/copyleft/gpl.html.
    • If you have questions regarding the use of this file, please contact
    • Nokia at qt-info@nokia.com.
    • $QT_END_LICENSE$
                                                                                                                                                        • /
  1. include <QApplication>
  2. include <QtGui>

class MyStylePlugin : public QStylePlugin { public:

   MyStylePlugin(QObject *parent = 0);
   QStyle *create(const QString &key);
   QStringList keys() const;

}; class RocketStyle : public QCommonStyle { public:

   RocketStyle() {};

}; class StarBusterStyle : public QCommonStyle { public:

   StarBusterStyle() {};

}; MyStylePlugin::MyStylePlugin(QObject *parent)

   : QStylePlugin(parent)

{ }

QStringList MyStylePlugin::keys() const {

   return QStringList() << "Rocket" << "StarBuster";

}

QStyle *MyStylePlugin::create(const QString &key) {

   QString lcKey = key;
   if (lcKey == "rocket") {
       return new RocketStyle;
   } else if (lcKey == "starbuster") {
       return new StarBusterStyle;
   }
   return 0;

}

int main(int argc, char *argv[]) {

   QApplication app(argc, argv);
   MyStylePlugin plugin;
   return app.exec();

}


 </source>


QStyleOptionFocusRect and QStyle::PE_FrameFocusRect

<source lang="cpp"> /****************************************************************************

    • Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
    • All rights reserved.
    • Contact: Nokia Corporation (qt-info@nokia.com)
    • This file is part of the documentation of the Qt Toolkit.
    • $QT_BEGIN_LICENSE:LGPL$
    • Commercial Usage
    • Licensees holding valid Qt Commercial licenses may use this file in
    • accordance with the Qt Commercial License Agreement provided with the
    • Software or, alternatively, in accordance with the terms contained in
    • a written agreement between you and Nokia.
    • 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.
    • GNU General Public License Usage
    • Alternatively, this file may be used under the terms of the GNU
    • General Public License version 3.0 as published by the Free Software
    • Foundation and appearing in the file LICENSE.GPL included in the
    • packaging of this file. Please review the following information to
    • ensure the GNU General Public License version 3.0 requirements will be
    • met: http://www.gnu.org/copyleft/gpl.html.
    • If you have questions regarding the use of this file, please contact
    • Nokia at qt-info@nokia.com.
    • $QT_END_LICENSE$
                                                                                                                                                        • /
  1. include <QStyleOption>
  2. include <QStylePainter>
  3. include <QWidget>

class MyWidget : public QWidget { protected:

   void paintEvent(QPaintEvent *event);
   void paintEvent2(QPaintEvent *event);

};

void MyWidget::paintEvent(QPaintEvent * /* event */) {

   QPainter painter(this);
   QStyleOptionFocusRect option;
   option.initFrom(this);
   option.backgroundColor = palette().color(QPalette::Background);
   style()->drawPrimitive(QStyle::PE_FrameFocusRect, &option, &painter, this);

}

void MyWidget::paintEvent2(QPaintEvent * /* event */) {

   QStylePainter painter(this);
   QStyleOptionFocusRect option;
   option.initFrom(this);
   option.backgroundColor = palette().color(QPalette::Background);
   painter.drawPrimitive(QStyle::PE_FrameFocusRect, option);

}

int main() {

   return 0;

}


 </source>


QStyle options

<source lang="cpp"> /****************************************************************************

    • Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
    • All rights reserved.
    • Contact: Nokia Corporation (qt-info@nokia.com)
    • This file is part of the documentation of the Qt Toolkit.
    • $QT_BEGIN_LICENSE:LGPL$
    • Commercial Usage
    • Licensees holding valid Qt Commercial licenses may use this file in
    • accordance with the Qt Commercial License Agreement provided with the
    • Software or, alternatively, in accordance with the terms contained in
    • a written agreement between you and Nokia.
    • 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.
    • GNU General Public License Usage
    • Alternatively, this file may be used under the terms of the GNU
    • General Public License version 3.0 as published by the Free Software
    • Foundation and appearing in the file LICENSE.GPL included in the
    • packaging of this file. Please review the following information to
    • ensure the GNU General Public License version 3.0 requirements will be
    • met: http://www.gnu.org/copyleft/gpl.html.
    • If you have questions regarding the use of this file, please contact
    • Nokia at qt-info@nokia.com.
    • $QT_END_LICENSE$
                                                                                                                                                        • /
  1. include <QtGui>
  2. include <QApplication>

class MyPushButton : public QPushButton { public:

   MyPushButton(QWidget *parent = 0);
   void paintEvent(QPaintEvent *);

}; MyPushButton::MyPushButton(QWidget *parent)

   : QPushButton(parent)

{ }

void MyPushButton::paintEvent(QPaintEvent *) {

   QStyleOptionButton option;
   option.initFrom(this);
   option.state = isDown() ? QStyle::State_Sunken : QStyle::State_Raised;
   if (isDefault())
       option.features |= QStyleOptionButton::DefaultButton;
   option.text = text();
   option.icon = icon();
   QPainter painter(this);
   style()->drawControl(QStyle::CE_PushButton, &option, &painter, this);

}


class MyStyle : public QStyle { public:

   MyStyle();
   void drawPrimitive(PrimitiveElement element, const QStyleOption *option,
                      QPainter *painter, const QWidget *widget);

}; MyStyle::MyStyle() {

   QStyleOptionFrame *option;
   if (const QStyleOptionFrame *frameOption =
          qstyleoption_cast<const QStyleOptionFrame *>(option)) {
       QStyleOptionFrameV2 frameOptionV2(*frameOption);
       // draw the frame using frameOptionV2
   }
   if (const QStyleOptionProgressBar *progressBarOption =
          qstyleoption_cast<const QStyleOptionProgressBar *>(option)) {
       QStyleOptionProgressBarV2 progressBarV2(*progressBarOption);
       // draw the progress bar using progressBarV2
   }
   if (const QStyleOptionTab *tabOption =
          qstyleoption_cast<const QStyleOptionTab *>(option)) {
       QStyleOptionTabV2 tabV2(*tabOption);
       // draw the tab using tabV2
  }

}

void MyStyle::drawPrimitive(PrimitiveElement element,

                           const QStyleOption *option,
                           QPainter *painter,
                           const QWidget *widget)

{

   if (element == PE_FrameFocusRect) {
       const QStyleOptionFocusRect *focusRectOption =
               qstyleoption_cast<const QStyleOptionFocusRect *>(option);
       if (focusRectOption) {
           // ...
       }
   }
   // ...

}

int main(int argc, char *argv[]) {

   QApplication app(argc, argv);
   MyPushButton button;
   button.show();
   return app.exec();

}


 </source>