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-/****************************************************************************
-**
-** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
-** Contact: http://www.qt-project.org/
-**
-** This file is part of the documentation of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:BSD$
-** You may use this file under the terms of the BSD license as follows:
-**
-** "Redistribution and use in source and binary forms, with or without
-** modification, are permitted provided that the following conditions are
-** met:
-** * Redistributions of source code must retain the above copyright
-** notice, this list of conditions and the following disclaimer.
-** * Redistributions in binary form must reproduce the above copyright
-** notice, this list of conditions and the following disclaimer in
-** the documentation and/or other materials provided with the
-** distribution.
-** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
-** the names of its contributors may be used to endorse or promote
-** products derived from this software without specific prior written
-** permission.
-**
-** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#include <QtGui>
-
-class MyScrollArea : public QAbstractScrollArea
-{
-public:
- MyScrollArea(QWidget *w);
- void setWidget(QWidget *w);
-
-protected:
- void scrollContentsBy(int dx, int dy);
- void resizeEvent(QResizeEvent *event);
-
-private:
- void updateWidgetPosition();
- void updateArea();
-
- QWidget *widget;
-};
-
-MyScrollArea::MyScrollArea(QWidget *widget)
- : QAbstractScrollArea()
-{
- setWidget(widget);
-}
-
-void MyScrollArea::setWidget(QWidget *w)
-{
- widget = w;
- widget->setParent(viewport());
- if (!widget->testAttribute(Qt::WA_Resized))
- widget->resize(widget->sizeHint());
-
- verticalScrollBar()->setValue(0);
- verticalScrollBar()->setValue(0);
-
- updateArea();
-}
-
-void MyScrollArea::updateWidgetPosition()
-{
-//! [0]
- int hvalue = horizontalScrollBar()->value();
- int vvalue = verticalScrollBar()->value();
- QPoint topLeft = viewport()->rect().topLeft();
-
- widget->move(topLeft.x() - hvalue, topLeft.y() - vvalue);
-//! [0]
-}
-
-void MyScrollArea::scrollContentsBy(int /*dx*/, int /*dy*/)
-{
- updateWidgetPosition();
-}
-
-void MyScrollArea::updateArea()
-{
-//! [1]
- QSize areaSize = viewport()->size();
- QSize widgetSize = widget->size();
-
- verticalScrollBar()->setPageStep(areaSize.height());
- horizontalScrollBar()->setPageStep(areaSize.width());
- verticalScrollBar()->setRange(0, widgetSize.height() - areaSize.height());
- horizontalScrollBar()->setRange(0, widgetSize.width() - areaSize.width());
- updateWidgetPosition();
-//! [1]
-}
-
-void MyScrollArea::resizeEvent(QResizeEvent *event)
-{
- updateArea();
-}
-
-int main(int argv, char **args)
-{
- QApplication app(argv, args);
-
- QPixmap pixmap("mypixmap.png");
- QLabel label;
- label.setPixmap(pixmap);
- MyScrollArea area(&label);
- area.resize(300, 300);
- area.show();
-
- area.setWidget(&label);
-
- return app.exec();
-}