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Diffstat (limited to 'examples/embedded/flickable/flickable.cpp')
-rw-r--r-- | examples/embedded/flickable/flickable.cpp | 293 |
1 files changed, 0 insertions, 293 deletions
diff --git a/examples/embedded/flickable/flickable.cpp b/examples/embedded/flickable/flickable.cpp deleted file mode 100644 index 8cf7a28cde..0000000000 --- a/examples/embedded/flickable/flickable.cpp +++ /dev/null @@ -1,293 +0,0 @@ -/**************************************************************************** -** -** Copyright (C) 2016 The Qt Company Ltd. -** Contact: https://www.qt.io/licensing/ -** -** This file is part of the demonstration applications of the Qt Toolkit. -** -** $QT_BEGIN_LICENSE:BSD$ -** Commercial License Usage -** Licensees holding valid commercial Qt licenses may use this file in -** accordance with the commercial license agreement provided with the -** Software or, alternatively, in accordance with the terms contained in -** a written agreement between you and The Qt Company. For licensing terms -** and conditions see https://www.qt.io/terms-conditions. For further -** information use the contact form at https://www.qt.io/contact-us. -** -** BSD License Usage -** Alternatively, 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 The Qt Company Ltd 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 "flickable.h" - -#include <QtCore> -#include <QtWidgets> - -class FlickableTicker: QObject -{ -public: - FlickableTicker(Flickable *scroller) { - m_scroller = scroller; - } - - void start(int interval) { - if (!m_timer.isActive()) - m_timer.start(interval, this); - } - - void stop() { - m_timer.stop(); - } - -protected: - void timerEvent(QTimerEvent *event) { - Q_UNUSED(event); - m_scroller->tick(); - } - -private: - Flickable *m_scroller; - QBasicTimer m_timer; -}; - -class FlickablePrivate -{ -public: - typedef enum { - Steady, - Pressed, - ManualScroll, - AutoScroll, - Stop - } State; - - State state; - int threshold; - QPoint pressPos; - QPoint offset; - QPoint delta; - QPoint speed; - FlickableTicker *ticker; - QElapsedTimer timeStamp; - QWidget *target; - QList<QEvent*> ignoreList; -}; - -Flickable::Flickable() -{ - d = new FlickablePrivate; - d->state = FlickablePrivate::Steady; - d->threshold = 10; - d->ticker = new FlickableTicker(this); - d->timeStamp.start(); - d->target = 0; -} - -Flickable::~Flickable() -{ - delete d; -} - -void Flickable::setThreshold(int th) -{ - if (th >= 0) - d->threshold = th; -} - -int Flickable::threshold() const -{ - return d->threshold; -} - -void Flickable::setAcceptMouseClick(QWidget *target) -{ - d->target = target; -} - -static QPoint deaccelerate(const QPoint &speed, int a = 1, int max = 64) -{ - int x = qBound(-max, speed.x(), max); - int y = qBound(-max, speed.y(), max); - x = (x == 0) ? x : (x > 0) ? qMax(0, x - a) : qMin(0, x + a); - y = (y == 0) ? y : (y > 0) ? qMax(0, y - a) : qMin(0, y + a); - return QPoint(x, y); -} - -void Flickable::handleMousePress(QMouseEvent *event) -{ - event->ignore(); - - if (event->button() != Qt::LeftButton) - return; - - if (d->ignoreList.removeAll(event)) - return; - - switch (d->state) { - - case FlickablePrivate::Steady: - event->accept(); - d->state = FlickablePrivate::Pressed; - d->pressPos = event->position().toPoint(); - break; - - case FlickablePrivate::AutoScroll: - event->accept(); - d->state = FlickablePrivate::Stop; - d->speed = QPoint(0, 0); - d->pressPos = event->position().toPoint(); - d->offset = scrollOffset(); - d->ticker->stop(); - break; - - default: - break; - } -} - -void Flickable::handleMouseRelease(QMouseEvent *event) -{ - event->ignore(); - - if (event->button() != Qt::LeftButton) - return; - - if (d->ignoreList.removeAll(event)) - return; - - QPoint delta; - - switch (d->state) { - - case FlickablePrivate::Pressed: - event->accept(); - d->state = FlickablePrivate::Steady; - if (d->target) { - QMouseEvent *event1 = new QMouseEvent(QEvent::MouseButtonPress, - d->pressPos, Qt::LeftButton, - Qt::LeftButton, Qt::NoModifier); - QMouseEvent *event2 = event->clone(); - d->ignoreList << event1; - d->ignoreList << event2; - QApplication::postEvent(d->target, event1); - QApplication::postEvent(d->target, event2); - } - break; - - case FlickablePrivate::ManualScroll: - event->accept(); - delta = event->position().toPoint() - d->pressPos; - if (d->timeStamp.elapsed() > 100) { - d->timeStamp.start(); - d->speed = delta - d->delta; - d->delta = delta; - } - d->offset = scrollOffset(); - d->pressPos = event->position().toPoint(); - if (d->speed == QPoint(0, 0)) { - d->state = FlickablePrivate::Steady; - } else { - d->speed /= 4; - d->state = FlickablePrivate::AutoScroll; - d->ticker->start(20); - } - break; - - case FlickablePrivate::Stop: - event->accept(); - d->state = FlickablePrivate::Steady; - d->offset = scrollOffset(); - break; - - default: - break; - } -} - -void Flickable::handleMouseMove(QMouseEvent *event) -{ - event->ignore(); - - if (!(event->buttons() & Qt::LeftButton)) - return; - - if (d->ignoreList.removeAll(event)) - return; - - QPoint delta; - - switch (d->state) { - - case FlickablePrivate::Pressed: - case FlickablePrivate::Stop: - delta = event->position().toPoint() - d->pressPos; - if (delta.x() > d->threshold || delta.x() < -d->threshold || - delta.y() > d->threshold || delta.y() < -d->threshold) { - d->timeStamp.start(); - d->state = FlickablePrivate::ManualScroll; - d->delta = QPoint(0, 0); - d->pressPos = event->position().toPoint(); - event->accept(); - } - break; - - case FlickablePrivate::ManualScroll: - event->accept(); - delta = event->position().toPoint() - d->pressPos; - setScrollOffset(d->offset - delta); - if (d->timeStamp.elapsed() > 100) { - d->timeStamp.start(); - d->speed = delta - d->delta; - d->delta = delta; - } - break; - - default: - break; - } -} - -void Flickable::tick() -{ - if (d->state == FlickablePrivate:: AutoScroll) { - d->speed = deaccelerate(d->speed); - setScrollOffset(d->offset - d->speed); - d->offset = scrollOffset(); - if (d->speed == QPoint(0, 0)) { - d->state = FlickablePrivate::Steady; - d->ticker->stop(); - } - } else { - d->ticker->stop(); - } -} |