summaryrefslogtreecommitdiffstats
path: root/examples/embedded/flickable/flickable.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'examples/embedded/flickable/flickable.cpp')
-rw-r--r--examples/embedded/flickable/flickable.cpp293
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();
- }
-}
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-25 06:13:25 +0000