242 lines
8.3 KiB
C++
242 lines
8.3 KiB
C++
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/****************************************************************************
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**
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** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the test suite of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights. These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**
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**
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <QtGui>
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#include "mousepangesturerecognizer.h"
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class ScrollArea : public QScrollArea
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{
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Q_OBJECT
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public:
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ScrollArea(QWidget *parent = 0)
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: QScrollArea(parent), outside(false)
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{
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viewport()->grabGesture(Qt::PanGesture, Qt::ReceivePartialGestures);
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}
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protected:
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bool viewportEvent(QEvent *event)
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{
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if (event->type() == QEvent::Gesture) {
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gestureEvent(static_cast<QGestureEvent *>(event));
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return true;
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} else if (event->type() == QEvent::GestureOverride) {
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QGestureEvent *ge = static_cast<QGestureEvent *>(event);
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if (QPanGesture *pan = static_cast<QPanGesture *>(ge->gesture(Qt::PanGesture)))
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if (pan->state() == Qt::GestureStarted) {
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outside = false;
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}
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}
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return QScrollArea::viewportEvent(event);
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}
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void gestureEvent(QGestureEvent *event)
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{
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QPanGesture *pan = static_cast<QPanGesture *>(event->gesture(Qt::PanGesture));
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if (pan) {
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switch(pan->state()) {
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case Qt::GestureStarted: qDebug() << this << "Pan: started"; break;
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case Qt::GestureFinished: qDebug() << this << "Pan: finished"; break;
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case Qt::GestureCanceled: qDebug() << this << "Pan: canceled"; break;
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case Qt::GestureUpdated: break;
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default: qDebug() << this << "Pan: <unknown state>"; break;
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}
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if (pan->state() == Qt::GestureStarted)
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outside = false;
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event->ignore();
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event->ignore(pan);
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if (outside)
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return;
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const QPointF delta = pan->delta();
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const QPointF totalOffset = pan->offset();
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QScrollBar *vbar = verticalScrollBar();
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QScrollBar *hbar = horizontalScrollBar();
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if ((vbar->value() == vbar->minimum() && totalOffset.y() > 10) ||
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(vbar->value() == vbar->maximum() && totalOffset.y() < -10)) {
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outside = true;
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return;
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}
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if ((hbar->value() == hbar->minimum() && totalOffset.x() > 10) ||
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(hbar->value() == hbar->maximum() && totalOffset.x() < -10)) {
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outside = true;
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return;
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}
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vbar->setValue(vbar->value() - delta.y());
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hbar->setValue(hbar->value() - delta.x());
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event->accept(pan);
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}
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}
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private:
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bool outside;
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};
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class Slider : public QSlider
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{
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public:
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Slider(Qt::Orientation orientation, QWidget *parent = 0)
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: QSlider(orientation, parent)
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{
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grabGesture(Qt::PanGesture);
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}
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protected:
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bool event(QEvent *event)
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{
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if (event->type() == QEvent::Gesture) {
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gestureEvent(static_cast<QGestureEvent *>(event));
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return true;
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}
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return QSlider::event(event);
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}
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void gestureEvent(QGestureEvent *event)
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{
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QPanGesture *pan = static_cast<QPanGesture *>(event->gesture(Qt::PanGesture));
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if (pan) {
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switch (pan->state()) {
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case Qt::GestureStarted: qDebug() << this << "Pan: started"; break;
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case Qt::GestureFinished: qDebug() << this << "Pan: finished"; break;
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case Qt::GestureCanceled: qDebug() << this << "Pan: canceled"; break;
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case Qt::GestureUpdated: break;
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default: qDebug() << this << "Pan: <unknown state>"; break;
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}
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if (pan->state() == Qt::GestureStarted)
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outside = false;
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event->ignore();
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event->ignore(pan);
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if (outside)
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return;
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const QPointF delta = pan->delta();
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const QPointF totalOffset = pan->offset();
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if (orientation() == Qt::Horizontal) {
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if ((value() == minimum() && totalOffset.x() < -10) ||
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(value() == maximum() && totalOffset.x() > 10)) {
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outside = true;
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return;
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}
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if (totalOffset.y() < 40 && totalOffset.y() > -40) {
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setValue(value() + delta.x());
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event->accept(pan);
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} else {
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outside = true;
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}
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} else if (orientation() == Qt::Vertical) {
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if ((value() == maximum() && totalOffset.y() < -10) ||
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(value() == minimum() && totalOffset.y() > 10)) {
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outside = true;
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return;
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}
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if (totalOffset.x() < 40 && totalOffset.x() > -40) {
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setValue(value() - delta.y());
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event->accept(pan);
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} else {
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outside = true;
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}
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}
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}
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}
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private:
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bool outside;
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};
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class MainWindow : public QMainWindow
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{
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public:
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MainWindow()
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{
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rootScrollArea = new ScrollArea;
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rootScrollArea->setObjectName(QLatin1String("rootScrollArea"));
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setCentralWidget(rootScrollArea);
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QWidget *root = new QWidget;
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root->setFixedSize(3000, 3000);
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rootScrollArea->setWidget(root);
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Slider *verticalSlider = new Slider(Qt::Vertical, root);
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verticalSlider->setObjectName(QLatin1String("verticalSlider"));
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verticalSlider ->move(650, 1100);
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Slider *horizontalSlider = new Slider(Qt::Horizontal, root);
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horizontalSlider->setObjectName(QLatin1String("horizontalSlider"));
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horizontalSlider ->move(600, 1000);
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childScrollArea = new ScrollArea(root);
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childScrollArea->setObjectName(QLatin1String("childScrollArea"));
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childScrollArea->move(500, 500);
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QWidget *w = new QWidget;
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w->setMinimumWidth(700);
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QVBoxLayout *l = new QVBoxLayout(w);
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l->setMargin(20);
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for (int i = 0; i < 100; ++i) {
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QWidget *w = new QWidget;
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QHBoxLayout *ll = new QHBoxLayout(w);
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ll->addWidget(new QLabel(QString("Label %1").arg(i)));
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ll->addWidget(new QPushButton(QString("Button %1").arg(i)));
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l->addWidget(w);
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}
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childScrollArea->setWidget(w);
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#if defined(Q_OS_WIN)
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// Windows can force Qt to create a native window handle for an
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// intermediate widget and that will block gesture to get touch events.
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// So this hack to make sure gestures get all touch events they need.
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foreach (QObject *w, children())
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if (w->isWidgetType())
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static_cast<QWidget *>(w)->setAttribute(Qt::WA_AcceptTouchEvents);
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#endif
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}
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private:
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ScrollArea *rootScrollArea;
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ScrollArea *childScrollArea;
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};
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int main(int argc, char **argv)
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{
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QApplication app(argc, argv);
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QGestureRecognizer::registerRecognizer(new MousePanGestureRecognizer);
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MainWindow w;
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w.show();
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return app.exec();
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}
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#include "main.moc"
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