--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/benchmarks/uimodels/GraphicsViewBenchmark/widgets/scroller.cpp Tue Feb 02 00:43:10 2010 +0200
@@ -0,0 +1,305 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** 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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, 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 are unsure which license is appropriate for your use, please
+** contact the sales department at http://qt.nokia.com/contact.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#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"