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Diffstat (limited to 'examples/widgets/scroller/graphicsview/main.cpp')
| -rw-r--r-- | examples/widgets/scroller/graphicsview/main.cpp | 302 |
1 files changed, 0 insertions, 302 deletions
diff --git a/examples/widgets/scroller/graphicsview/main.cpp b/examples/widgets/scroller/graphicsview/main.cpp deleted file mode 100644 index 178c431e6c..0000000000 --- a/examples/widgets/scroller/graphicsview/main.cpp +++ /dev/null @@ -1,302 +0,0 @@ -/**************************************************************************** -** -** Copyright (C) 2016 The Qt Company Ltd. -** Contact: https://www.qt.io/licensing/ -** -** This file is part of the examples 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 <QtCore> -#include <QtWidgets> - -#define NUM_ITEMS 100 -#define NUM_LISTS 10 - -/*! - \class RectObject - Note that it needs to be a QGraphicsObject or else the gestures will not work correctly. -*/ -class RectObject : public QGraphicsObject -{ - Q_OBJECT - -public: - - RectObject(const QString &text, qreal x, qreal y, qreal width, qreal height, QBrush brush, QGraphicsItem *parent = nullptr) - : QGraphicsObject(parent) - , m_text(text) - , m_rect(x, y, width, height) - , m_pen(brush.color().lighter(), 3.0) - , m_brush(brush) - { - setFlag(QGraphicsItem::ItemClipsToShape, true); - } - - QRectF boundingRect() const override - { - // here we only want the size of the children and not the size of the children of the children... - qreal halfpw = m_pen.widthF() / 2; - QRectF rect = m_rect; - if (halfpw > 0.0) - rect.adjust(-halfpw, -halfpw, halfpw, halfpw); - - return rect; - } - - void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) override - { - Q_UNUSED(option); - Q_UNUSED(widget); - painter->setPen(m_pen); - painter->setBrush(m_brush); - painter->drawRect(m_rect); - - painter->setPen(Qt::black); - QFont f; - f.setPixelSize(m_rect.height()); - painter->setFont(f); - painter->drawText(m_rect, Qt::AlignCenter, m_text); - } - - QString m_text; - QRectF m_rect; - QPen m_pen; - QBrush m_brush; -}; - -class ViewObject : public QGraphicsObject -{ - Q_OBJECT -public: - ViewObject(QGraphicsObject *parent) - : QGraphicsObject(parent) - { } - - QRectF boundingRect() const override - { - QRectF rect; - const auto items = childItems(); - for (const QGraphicsItem *item : items) - rect |= item->boundingRect().translated(item->pos()); - return rect; - } - - void paint(QPainter *, const QStyleOptionGraphicsItem *, QWidget *) override - { } -}; - -class ListObject : public QGraphicsObject -{ - Q_OBJECT - -public: - ListObject(const QSizeF &size, bool useTouch) - { - m_size = size; - setFlag(QGraphicsItem::ItemClipsChildrenToShape, true); - // grab gesture via Touch or Mouse events - QScroller::grabGesture(this, useTouch ? QScroller::TouchGesture : QScroller::LeftMouseButtonGesture); - - // this needs to be QGraphicsOBJECT - otherwise gesture recognition - // will not work for the parent of the viewport (in this case the - // list) - m_viewport = new ViewObject(this); - - } - - QGraphicsObject *viewport() const - { - return m_viewport; - } - - bool event(QEvent *e) override - { - switch (e->type()) { -// ![2] - case QEvent::ScrollPrepare: { - QScrollPrepareEvent *se = static_cast<QScrollPrepareEvent *>(e); - se->setViewportSize(m_size); - QRectF br = m_viewport->boundingRect(); - se->setContentPosRange(QRectF(0, 0, - qMax(qreal(0), br.width() - m_size.width()), - qMax(qreal(0), br.height() - m_size.height()))); - se->setContentPos(-m_viewport->pos()); - se->accept(); - return true; - } -// ![1] -// ![2] - case QEvent::Scroll: { - QScrollEvent *se = static_cast<QScrollEvent *>(e); - m_viewport->setPos(-se->contentPos() - se->overshootDistance()); - return true; - } -// ![2] - default: - break; - } - return QGraphicsObject::event(e); - } - - bool sceneEvent(QEvent *e) override - { - switch (e->type()) { - case QEvent::TouchBegin: { - // We need to return true for the TouchBegin here in the - // top-most graphics object - otherwise gestures in our parent - // objects will NOT work at all (the accept() flag is already - // set due to our setAcceptTouchEvents(true) call in the c'tor - return true; - - } - case QEvent::GraphicsSceneMousePress: { - // We need to return true for the MousePress here in the - // top-most graphics object - otherwise gestures in our parent - // objects will NOT work at all (the accept() flag is already - // set to true by Qt) - return true; - - } - default: - break; - } - return QGraphicsObject::sceneEvent(e); - } - - QRectF boundingRect() const override - { - return QRectF(0, 0, m_size.width() + 3, m_size.height()); - } - - void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) override - { - Q_UNUSED(option); - Q_UNUSED(widget); - painter->setPen(QPen(QColor(100, 100, 100), 3.0)); - painter->drawRect(QRectF(1.5, 1.5, m_size.width() - 3, m_size.height() - 3)); - } - - QSizeF m_size; - ViewObject *m_viewport; -}; - -class MainWindow : public QMainWindow -{ - Q_OBJECT - -public: - MainWindow(bool useTouch) - { - m_scene = new QGraphicsScene(); - - // -- make the main list - ListObject *mainList = new ListObject(QSizeF(780, 400), useTouch); - mainList->setObjectName(QLatin1String("MainList")); - m_scene->addItem(mainList); -// ![3] - for (int i=0; i<NUM_LISTS; i++) { - ListObject *childList = new ListObject(QSizeF(mainList->m_size.width()/3, mainList->m_size.height()), useTouch); - childList->setObjectName(QString("ChildList %1").arg(i)); - fillList(childList); - childList->setParentItem(mainList->viewport()); - childList->setPos(i*mainList->m_size.width()/3, 0); - } - mainList->viewport()->setPos(0, 0); - - - /* - list1->setTransformOriginPoint(200, 200); - list1->setRotation(135); - list1->setPos(20 + 200 * .41, 20 + 200 * .41); - */ -// ![3] - - m_view = new QGraphicsView(m_scene); - setCentralWidget(m_view); - setWindowTitle(tr("Gesture example")); - m_scene->setSceneRect(0, 0, m_view->viewport()->width(), m_view->viewport()->height()); - } - - /** - * Fills the list object \a list with RectObjects. - */ - void fillList(ListObject *list) - { - qreal h = list->m_size.height() / 10; - for (int i=0; i<NUM_ITEMS; i++) { - QColor color = QColor(255*i/NUM_ITEMS, 255*(NUM_ITEMS-i)/NUM_ITEMS, 127*(i%2)+64*(i/2%2)); - QString text = QLatin1String("Item #") + QString::number(i); - QGraphicsItem *rect = new RectObject(text, 0, 0, list->m_size.width() - 6, h - 3, QBrush(color), list->viewport()); - rect->setPos(3, h*i+3); - } - list->viewport()->setPos(0, 0); - } - - -protected: - void resizeEvent(QResizeEvent *e) override - { - // resize the scene according to our own size to prevent scrolling - m_scene->setSceneRect(0, 0, m_view->viewport()->width(), m_view->viewport()->height()); - QMainWindow::resizeEvent(e); - } - - QGraphicsScene *m_scene; - QGraphicsView *m_view; -}; - -int main(int argc, char *argv[]) -{ - QApplication a(argc, argv); - bool touch = (a.arguments().contains(QLatin1String("--touch"))); - MainWindow mw(touch); - mw.show(); -#ifdef Q_OS_MAC - mw.raise(); -#endif - return a.exec(); -} - -#include "main.moc" |