From aa50245865b5bf8655ee3d476ee961009f0c314e Mon Sep 17 00:00:00 2001 From: "Bradley T. Hughes" Date: Wed, 25 Mar 2009 13:38:02 +0100 Subject: add a multitouch example that shows how to handle multitouch events in QGraphicsItems --- examples/multitouch/knobs/knob.cpp | 93 +++++++++++++++++++++++++++++++++++++ examples/multitouch/knobs/knob.h | 55 ++++++++++++++++++++++ examples/multitouch/knobs/knobs.pro | 2 + examples/multitouch/knobs/main.cpp | 66 ++++++++++++++++++++++++++ examples/multitouch/multitouch.pro | 2 +- 5 files changed, 217 insertions(+), 1 deletion(-) create mode 100644 examples/multitouch/knobs/knob.cpp create mode 100644 examples/multitouch/knobs/knob.h create mode 100644 examples/multitouch/knobs/knobs.pro create mode 100644 examples/multitouch/knobs/main.cpp diff --git a/examples/multitouch/knobs/knob.cpp b/examples/multitouch/knobs/knob.cpp new file mode 100644 index 0000000..4622f69 --- /dev/null +++ b/examples/multitouch/knobs/knob.cpp @@ -0,0 +1,93 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (qt-info@nokia.com) +** +** This file is part of the $MODULE$ of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial Usage +** Licensees holding valid Qt Commercial licenses may use this file in +** accordance with the Qt Commercial License Agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and Nokia. +** +** 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 qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "knob.h" + +#include +#include + +Knob::Knob() + : QGraphicsEllipseItem(-50, -50, 100, 100) +{ + setAcceptTouchEvents(true); + setBrush(Qt::lightGray); + + QGraphicsEllipseItem *leftItem = new QGraphicsEllipseItem(0, 0, 10, 10, this); + leftItem->setPos(-45, -5); + leftItem->setBrush(Qt::darkGreen); + + QGraphicsEllipseItem *rightItem = new QGraphicsEllipseItem(0, 0, 10, 10, this); + rightItem->setPos(35, -5); + rightItem->setBrush(Qt::darkRed); +} + +bool Knob::sceneEvent(QEvent *event) +{ + switch (event->type()) { + case QEvent::GraphicsSceneTouchBegin: + event->accept(); + break; + + case QEvent::GraphicsSceneTouchUpdate: + case QEvent::GraphicsSceneTouchEnd: + { + QGraphicsSceneTouchEvent *touchEvent = static_cast(event); + + if (touchEvent->touchPoints().count() == 2) { + QGraphicsSceneTouchEvent::TouchPoint *touchPoint1 = touchEvent->touchPoints().first(); + QGraphicsSceneTouchEvent::TouchPoint *touchPoint2 = touchEvent->touchPoints().last(); + + QLineF line1(touchPoint1->lastScenePos(), touchPoint2->lastScenePos()); + QLineF line2(touchPoint1->scenePos(), touchPoint2->scenePos()); + + rotate(line2.angleTo(line1)); + } + + touchEvent->accept(); + break; + } + + default: + return QGraphicsItem::sceneEvent(event); + } + + return true; +} diff --git a/examples/multitouch/knobs/knob.h b/examples/multitouch/knobs/knob.h new file mode 100644 index 0000000..1079483 --- /dev/null +++ b/examples/multitouch/knobs/knob.h @@ -0,0 +1,55 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (qt-info@nokia.com) +** +** This file is part of the $MODULE$ of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial Usage +** Licensees holding valid Qt Commercial licenses may use this file in +** accordance with the Qt Commercial License Agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and Nokia. +** +** 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 qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#ifndef KNOB_H +#define KNOB_H + +#include + +class Knob : public QGraphicsEllipseItem +{ +public: + Knob(); + + bool sceneEvent(QEvent *event); +}; + +#endif // KNOB_H diff --git a/examples/multitouch/knobs/knobs.pro b/examples/multitouch/knobs/knobs.pro new file mode 100644 index 0000000..90f0ba5 --- /dev/null +++ b/examples/multitouch/knobs/knobs.pro @@ -0,0 +1,2 @@ +HEADERS = knob.h +SOURCES = main.cpp knob.cpp diff --git a/examples/multitouch/knobs/main.cpp b/examples/multitouch/knobs/main.cpp new file mode 100644 index 0000000..c5a7ea7 --- /dev/null +++ b/examples/multitouch/knobs/main.cpp @@ -0,0 +1,66 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (qt-info@nokia.com) +** +** This file is part of the $MODULE$ of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial Usage +** Licensees holding valid Qt Commercial licenses may use this file in +** accordance with the Qt Commercial License Agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and Nokia. +** +** 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 qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include +#include + +#include "knob.h" + +int main(int argc, char **argv) +{ + QApplication app(argc, argv); + + QGraphicsScene scene; + QGraphicsView view(&scene); + view.viewport()->setAttribute(Qt::WA_AcceptTouchEvents); + + Knob *knob1 = new Knob; + knob1->setPos(-110, 0); + Knob *knob2 = new Knob; + + scene.addItem(knob1); + scene.addItem(knob2); + + view.showFullScreen(); + view.fitInView(scene.sceneRect().adjusted(-20, -20, 20, 20), Qt::KeepAspectRatio); + + return app.exec(); +} diff --git a/examples/multitouch/multitouch.pro b/examples/multitouch/multitouch.pro index b2b2b76..b3d1d55 100644 --- a/examples/multitouch/multitouch.pro +++ b/examples/multitouch/multitouch.pro @@ -1,2 +1,2 @@ TEMPLATE = subdirs -SUBDIRS = pinchzoom fingerpaint +SUBDIRS = pinchzoom fingerpaint knobs -- cgit v0.12