qt-everywhere-src-5.15.1/qtmacextras/examples/macextras/mactoolbar/rasterwindow.cpp

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#include "rasterwindow.h"

RasterWindow::RasterWindow(QWindow *parent)
    : QWindow(parent)
{
    m_backingStore = new QBackingStore(this);
    create();

    setGeometry(100, 100, 300, 200);
}

void RasterWindow::setText(const QString &text)
{
    m_text = text;
    renderNow();
}

void RasterWindow::exposeEvent(QExposeEvent *)
{
    if (isExposed()) {
        m_backingStore->resize(size());
        renderNow();
    }
}

void RasterWindow::renderNow()
{
    if (!isExposed())
        return;

    QRect rect(0, 0, width(), height());
    m_backingStore->beginPaint(rect);

    QPaintDevice *device = m_backingStore->paintDevice();
    QPainter painter(device);

    painter.fillRect(0, 0, width(), height(), Qt::white);
    render(&painter);

    m_backingStore->endPaint();
    m_backingStore->flush(rect);
}

void RasterWindow::render(QPainter *painter)
{
    painter->drawText(QRectF(0, 0, width(), height()), Qt::AlignCenter, m_text);
}