qt 6.5.1 original

tests/manual/cocoa/wheelevent/CMakeLists.txt

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+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+#####################################################################
+## wheelevent Binary:
+#####################################################################
+
+qt_internal_add_manual_test(wheelevent
+    GUI
+    SOURCES
+        main.cpp
+        window.cpp window.h
+    LIBRARIES
+        Qt::CorePrivate
+        Qt::Gui
+        Qt::GuiPrivate
+        Qt::Widgets
+)

tests/manual/cocoa/wheelevent/main.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#include <QtCore>
+#include <QtWidgets>
+
+#include "window.h"
+
+int main(int argc, char *argv[])
+{
+    QGuiApplication app(argc, argv);
+
+    Window window;
+    window.show();
+
+
+    return app.exec();
+}
+
+
+

tests/manual/cocoa/wheelevent/wheelevent.pro

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+TEMPLATE = app
+
+HEADERS += window.h
+SOURCES += window.cpp main.cpp
+
+QT += core core-private gui gui-private widgets

tests/manual/cocoa/wheelevent/window.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#include "window.h"
+
+#include <private/qguiapplication_p.h>
+
+#include <QBackingStore>
+#include <QPainter>
+#include <QtWidgets>
+
+static int colorIndexId = 0;
+
+QColor colorTable[] =
+{
+    QColor("#f09f8f"),
+    QColor("#a2bff2"),
+    QColor("#c0ef8f")
+};
+
+Window::Window(QScreen *screen)
+    : QWindow(screen)
+    , m_backgroundColorIndex(colorIndexId++)
+{
+    initialize();
+}
+
+Window::Window(QWindow *parent)
+    : QWindow(parent)
+    , m_backgroundColorIndex(colorIndexId++)
+{
+    initialize();
+}
+
+void Window::initialize()
+{
+    if (parent())
+        setGeometry(QRect(160, 120, 320, 240));
+    else {
+        setGeometry(QRect(10, 10, 640, 480));
+
+        setSizeIncrement(QSize(10, 10));
+        setBaseSize(QSize(640, 480));
+        setMinimumSize(QSize(240, 160));
+    }
+
+    create();
+    m_backingStore = new QBackingStore(this);
+
+    m_image = QImage(geometry().size(), QImage::Format_RGB32);
+    m_image.fill(colorTable[m_backgroundColorIndex % (sizeof(colorTable) / sizeof(colorTable[0]))].rgba());
+
+    m_lastPos = QPoint(-1, -1);
+    m_renderTimer = 0;
+}
+
+void Window::mousePressEvent(QMouseEvent *event)
+{
+    m_lastPos = event->pos();
+}
+
+void Window::mouseMoveEvent(QMouseEvent *event)
+{
+    if (m_lastPos != QPoint(-1, -1)) {
+        QPainter p(&m_image);
+
+        QPen pen;
+        pen.setCosmetic(true);
+        pen.setWidth(1);
+        p.setPen(pen);
+
+        p.setRenderHint(QPainter::Antialiasing);
+        p.drawLine(m_lastPos, event->pos());
+        m_lastPos = event->pos();
+    }
+
+    scheduleRender();
+}
+
+void Window::wheelEvent(QWheelEvent *event)
+{
+    qDebug() << "wheelEvent delta" << event->delta() << "orientation" << event->orientation();
+    qDebug() << "wheelEvent pixelDelta" << event->pixelDelta();
+    qDebug() << "wheelEvent angleDelta" << event->angleDelta();
+
+    const bool useQt4API = false;
+
+    if (useQt4API) {
+        if (event->orientation() == Qt::Horizontal)
+            scrollOffset.setX(scrollOffset.x() + event->delta());
+        else
+            scrollOffset.setY(scrollOffset.y() + event->delta());
+        scheduleRender();
+    } else {
+        if (!event->pixelDelta().isNull()) {
+            scrollOffset += event->pixelDelta();
+            scheduleRender();
+        }
+    }
+}
+
+void Window::mouseReleaseEvent(QMouseEvent *event)
+{
+    if (m_lastPos != QPoint(-1, -1)) {
+        QPainter p(&m_image);
+        p.setRenderHint(QPainter::Antialiasing);
+        p.drawLine(m_lastPos, event->pos());
+        m_lastPos = QPoint(-1, -1);
+    }
+
+    scheduleRender();
+}
+
+void Window::exposeEvent(QExposeEvent *)
+{
+    scheduleRender();
+}
+
+void Window::resizeEvent(QResizeEvent *)
+{
+    QImage old = m_image;
+
+    qDebug() << "Window::resizeEvent" << geometry();
+
+    int width = qMax(geometry().width() * devicePixelRatio(), qreal(old.width()));
+    int height = qMax(geometry().height() * devicePixelRatio(), qreal(old.height()));
+
+    qDebug() << "Window::resizeEvent" << width << height;
+
+    if (width > old.width() || height > old.height()) {
+        m_image = QImage(width, height, QImage::Format_RGB32);
+        m_image.setDevicePixelRatio(devicePixelRatio());
+        m_image.fill(colorTable[(m_backgroundColorIndex) % (sizeof(colorTable) / sizeof(colorTable[0]))].rgba());
+
+        QPainter p(&m_image);
+        p.drawImage(0, 0, old);
+    }
+
+    render();
+}
+
+void Window::keyPressEvent(QKeyEvent *event)
+{
+    switch (event->key()) {
+    case Qt::Key_Backspace:
+        m_text.chop(1);
+        break;
+    case Qt::Key_Enter:
+    case Qt::Key_Return:
+        m_text.append('\n');
+        break;
+    default:
+        m_text.append(event->text());
+        break;
+    }
+    scheduleRender();
+}
+
+void Window::scheduleRender()
+{
+    if (!m_renderTimer)
+        m_renderTimer = startTimer(1);
+}
+
+void Window::timerEvent(QTimerEvent *)
+{
+    render();
+    killTimer(m_renderTimer);
+    m_renderTimer = 0;
+}
+
+void Window::render()
+{
+    QRect rect(QPoint(), geometry().size());
+
+    m_backingStore->resize(rect.size());
+
+    m_backingStore->beginPaint(rect);
+
+    QPaintDevice *device = m_backingStore->paintDevice();
+
+    QPainter p(device);
+    p.drawImage(0, 0, m_image);
+
+    QFont font;
+    font.setPixelSize(32);
+
+    p.setFont(font);
+    p.drawText(rect, 0, m_text);
+
+    // draw grid:
+    int gridSpace = 80;
+
+    QPen pen;
+    pen.setCosmetic(true);
+    pen.setWidth(1);
+    p.setPen(pen);
+
+
+    for (int y = 0; y < geometry().height() + gridSpace; y+= gridSpace) {
+        int offset = scrollOffset.y() % gridSpace;
+        //int color = ((y + offset) %255);// + scrollOffset.y()) % 255);
+        p.drawLine(0, y + offset, geometry().width(), y + offset);
+        //p.setBrush(QColor(color,0, 0));
+        //p.fillRect(0, y + offset, geometry().width(), gridSpace,QColor(color,0, 0));
+    }
+
+
+    for (int x = 0; x < geometry().width() + gridSpace; x+= gridSpace) {
+        p.drawLine(x + scrollOffset.x() % gridSpace, 0, x + scrollOffset.x() % gridSpace, geometry().height());
+    }
+
+    m_backingStore->endPaint();
+    m_backingStore->flush(rect);
+}
+
+

tests/manual/cocoa/wheelevent/window.h

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#include <QWindow>
+#include <QImage>
+
+class Window : public QWindow
+{
+public:
+    Window(QWindow *parent = nullptr);
+    Window(QScreen *screen);
+
+protected:
+    void mousePressEvent(QMouseEvent *);
+    void mouseMoveEvent(QMouseEvent *);
+    void mouseReleaseEvent(QMouseEvent *);
+    void wheelEvent(QWheelEvent *event);
+
+    void keyPressEvent(QKeyEvent *);
+
+    void exposeEvent(QExposeEvent *);
+    void resizeEvent(QResizeEvent *);
+
+    void timerEvent(QTimerEvent *);
+
+private:
+    void render();
+    void scheduleRender();
+    void initialize();
+
+    QString m_text;
+    QImage m_image;
+    QPoint m_lastPos;
+    int m_backgroundColorIndex;
+    QBackingStore *m_backingStore;
+    int m_renderTimer;
+    QPoint scrollOffset;
+};