1 files changed, 305 insertions, 0 deletions
diff --git a/tests/benchmarks/gui/graphicsview/functional/GraphicsViewBenchmark/widgets/scroller.cpp b/tests/benchmarks/gui/graphicsview/functional/GraphicsViewBenchmark/widgets/scroller.cpp
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index 0000000000..1b8433f767
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+++ b/tests/benchmarks/gui/graphicsview/functional/GraphicsViewBenchmark/widgets/scroller.cpp
@@ -0,0 +1,305 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the examples 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 <QScrollBar>
+#include <QEvent>
+#include <QGraphicsSceneMouseEvent>
+#include <QGraphicsView>
+#include <QDebug>
+
+#include "scroller.h"
+#include "scroller_p.h"
+#include "abstractscrollarea.h"
+#include "scrollbar.h"
+
+const int ScrollStep = 1;
+const int UpdateScrollingInterval = 55;
+const int UpdateScrollingSmoothInterval = 0;
+static const qreal MaxScrollingSpeed = 48.0;
+
+ScrollerPrivate::ScrollerPrivate(Scroller *scroller)
+    : m_scrollArea(0)
+    , m_scrollFactor(1.0)
+    , m_state(Stopped)
+    , q_ptr(scroller)
+    , m_eventViewport(0)
+{
+}
+
+ScrollerPrivate::~ScrollerPrivate()
+{
+}
+
+void ScrollerPrivate::stopScrolling()
+{
+    m_state = ScrollerPrivate::Started;
+    m_cursorPos = QCursor::pos();
+    m_speed = QPoint(0, 0);
+
+    if (m_scrollTimer.isActive())
+        m_scrollTimer.stop();
+}
+
+//Maps screen coordinates to scrollArea coordinates though current m_eventViewport widget 
+QPointF ScrollerPrivate::mapToScrollArea(const QPoint &point)
+{
+    if (!m_scrollArea || !m_eventViewport)
+        return point;
+
+    QObject *vparent = m_eventViewport->parent();
+    if (!vparent)
+        return point;
+
+    QGraphicsView *view = qobject_cast<QGraphicsView*>(vparent);
+    if (!view)
+        return point;
+
+    QPoint pt = view->mapFromGlobal(point);
+    return m_scrollArea->mapFromScene(view->mapToScene(pt));
+}
+
+bool ScrollerPrivate::eventFilter(QObject *obj, QEvent *event)
+{
+    if (obj != m_scrollArea
+        || (event->type() != QEvent::GraphicsSceneMouseMove
+            && event->type() != QEvent::GraphicsSceneMousePress
+            && event->type() != QEvent::GraphicsSceneMouseRelease
+            /*&& event->type() != QEvent::GraphicsSceneKeyPressed
+            && event->type() != QEvent::GraphicsSceneKeyReleased*/))
+        return false;
+
+    QGraphicsSceneMouseEvent* mouseEvent = 
+        static_cast<QGraphicsSceneMouseEvent*>(event);
+
+    m_eventViewport = mouseEvent->widget();
+
+    bool eventConsumed = false;
+
+    switch (m_state) {
+    case ScrollerPrivate::Stopped:
+        if (mouseEvent->type() == QEvent::GraphicsSceneMousePress &&
+            mouseEvent->buttons() == Qt::LeftButton) {
+            m_cursorPos = QCursor::pos();
+            m_speed = QPointF(0.0, 0.0);
+            m_state = Started;
+        }
+
+        eventConsumed = true;
+        break;
+
+    case ScrollerPrivate::Started:
+        if (mouseEvent->type() == QEvent::GraphicsSceneMouseMove) {
+            m_cursorPos = QCursor::pos();
+            m_state = ManualScrolling;
+
+            if (!m_scrollTimer.isActive()) 
+                m_scrollTimer.start(UpdateScrollingInterval);
+            else {
+                m_scrollTimer.stop();
+                m_scrollTimer.start(UpdateScrollingInterval);
+            }
+
+        } else if (mouseEvent->type() == QEvent::MouseButtonRelease) {
+            m_speed = QPoint(0, 0);
+            m_state = Stopped;
+
+            if (m_scrollTimer.isActive())
+                m_scrollTimer.stop();
+        }
+        eventConsumed = true;
+        break;
+
+    case ScrollerPrivate::ManualScrolling:
+        if (mouseEvent->type() == QEvent::GraphicsSceneMouseMove &&
+            m_scrollArea->viewport()->boundingRect().contains(mouseEvent->pos()) ) {
+
+            ScrollBar *hscroll = m_scrollArea->horizontalScrollBar();
+            ScrollBar *vscroll = m_scrollArea->verticalScrollBar();
+
+            QPointF d = m_scrollFactor * (mapToScrollArea(QCursor::pos()) - mapToScrollArea(m_cursorPos)); 
+
+            hscroll->setSliderPosition(hscroll->sliderPosition() - d.x());
+            vscroll->setSliderPosition(vscroll->sliderPosition() - d.y());
+
+            if (m_lastCursorTime.elapsed() > UpdateScrollingInterval) {
+                m_speed = mapToScrollArea(QCursor::pos()) - mapToScrollArea(m_cursorPos);
+                m_lastCursorTime.restart();
+            }
+
+            m_lastFrameTime.restart();
+
+            m_cursorPos = QCursor::pos();
+        } else if (mouseEvent->type() == QEvent::GraphicsSceneMouseRelease) {
+            m_state = AutoScrolling;
+            m_scrollSlowAccum = 0;
+            if (m_scrollTimer.isActive()) {
+                m_scrollTimer.stop();
+                m_scrollTimer.start(UpdateScrollingSmoothInterval);
+            }
+        }
+        eventConsumed = true;
+        break;
+
+    case ScrollerPrivate::AutoScrolling:
+        if (mouseEvent->type() == QEvent::GraphicsSceneMousePress) {
+            stopScrolling();
+        } else if (mouseEvent->type() == QEvent::MouseButtonRelease) {
+            m_state = Stopped;
+        }
+        eventConsumed  = true;
+        break;
+
+    default:
+        break;
+    }
+
+    return eventConsumed;
+}
+
+void ScrollerPrivate::updateScrolling()
+{
+    bool scrollOngoing = false;
+
+    if (!m_scrollArea) {
+        m_scrollTimer.stop();
+        return;
+    }
+
+    if (m_state == ManualScrolling) {
+        scrollOngoing = true;
+        m_speed = mapToScrollArea(QCursor::pos()) - mapToScrollArea(m_cursorPos);
+        m_cursorPos = QCursor::pos();
+    } else if (m_state == AutoScrolling) {
+        scrollOngoing = true;
+
+
+        qreal x = qMax(-MaxScrollingSpeed, qMin(m_speed.x(), MaxScrollingSpeed));
+        qreal y = qMax(-MaxScrollingSpeed, qMin(m_speed.y(), MaxScrollingSpeed));
+
+        int sinceLast = m_lastFrameTime.elapsed();
+        int slowdown = (ScrollStep * sinceLast) + m_scrollSlowAccum;
+        m_scrollSlowAccum = slowdown & 0x3F;
+        slowdown >>= 6;
+
+        if (x > 0)
+            x= qMax(qreal(0.0), x - slowdown);
+        else
+            x = qMin(qreal(0.0), x + slowdown);
+
+        if (y > 0)
+            y = qMax(qreal(0.0), y - slowdown);
+        else
+            y = qMin(qreal(0.0), y + slowdown);
+
+        m_speed = QPoint(x,y);
+
+        if (m_speed != QPoint(0,0)) {
+            QPointF d;
+
+            int xstep = (int(m_speed.x()) * sinceLast)>>6; // >>6 ~= *60 /1000 (==*64 /1024)
+            int ystep = (int(m_speed.y()) * sinceLast)>>6;
+            //qDebug() << sinceLast << "speedy" << speed.y()<<"ystep" << ystep;
+            QPoint step = QPoint(xstep,ystep);
+
+            if (ystep > 0)
+                d = (m_scrollArea->pos() + step);
+            else
+                d = -(m_scrollArea->pos() - step);
+
+            ScrollBar *hscroll = m_scrollArea->horizontalScrollBar();
+            ScrollBar *vscroll = m_scrollArea->verticalScrollBar();
+
+            hscroll->setSliderPosition(hscroll->sliderPosition() - m_scrollFactor * d.x());
+            vscroll->setSliderPosition(vscroll->sliderPosition() - m_scrollFactor * d.y());
+        } else { 
+            m_state = Stopped;
+            scrollOngoing = false;
+        }
+    }
+
+    m_lastFrameTime.restart();
+
+    if (!scrollOngoing)
+        m_scrollTimer.stop();
+}
+
+
+Scroller::Scroller(QObject *parent)
+    : QObject(parent), d_ptr(new ScrollerPrivate(this))
+{
+    Q_D(Scroller);
+    connect(&d->m_scrollTimer, SIGNAL(timeout()), this, SLOT(updateScrolling()));
+}
+
+Scroller::~Scroller()
+{
+    delete d_ptr;
+}
+
+void Scroller::setScrollable(AbstractScrollArea *area)
+{
+    Q_D(Scroller);
+
+    if (!area)
+        return;
+
+    d->m_scrollArea = area;
+}
+
+void Scroller::setScrollFactor(qreal scrollFactor)
+{
+    Q_D(Scroller);
+
+    d->m_scrollFactor = scrollFactor;
+}
+
+bool Scroller::eventFilter(QObject *obj, QEvent *event)
+{
+    Q_D(Scroller);
+    return d->eventFilter(obj, event);
+}
+
+void Scroller::stopScrolling()
+{
+    Q_D(Scroller);
+    d->stopScrolling();
+}
+#include "moc_scroller.cpp"