6.5.3 clean

tests/manual/examples/widgets/scroller/CMakeLists.txt

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+qt_internal_add_example(graphicsview)

tests/manual/examples/widgets/scroller/graphicsview/CMakeLists.txt

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+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+cmake_minimum_required(VERSION 3.16)
+project(graphicsview LANGUAGES CXX)
+
+if(NOT DEFINED INSTALL_EXAMPLESDIR)
+    set(INSTALL_EXAMPLESDIR "examples")
+endif()
+
+set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}/widgets/scroller/graphicsview")
+
+find_package(Qt6 REQUIRED COMPONENTS Core Gui Widgets)
+
+qt_standard_project_setup()
+
+qt_add_executable(graphicsview
+    main.cpp
+)
+
+set_target_properties(graphicsview PROPERTIES
+    WIN32_EXECUTABLE TRUE
+    MACOSX_BUNDLE TRUE
+)
+
+target_link_libraries(graphicsview PRIVATE
+    Qt6::Core
+    Qt6::Gui
+    Qt6::Widgets
+)
+
+install(TARGETS graphicsview
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
+    LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
+)

tests/manual/examples/widgets/scroller/graphicsview/graphicsview.pro

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+QT += widgets
+
+TEMPLATE = app
+SOURCES = main.cpp
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/widgets/scroller/graphicsview
+INSTALLS += target

tests/manual/examples/widgets/scroller/graphicsview/main.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#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"

tests/manual/examples/widgets/scroller/scroller.pro

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+TEMPLATE = subdirs
+SUBDIRS +=  graphicsview