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| |
| #include "rasterwindow.h" |
| |
| //! [1] |
| RasterWindow::RasterWindow(QWindow *parent) |
| : QWindow(parent) |
| , m_backingStore(new QBackingStore(this)) |
| { |
| setGeometry(100, 100, 300, 200); |
| } |
| //! [1] |
| |
| |
| //! [7] |
| bool RasterWindow::event(QEvent *event) |
| { |
| if (event->type() == QEvent::UpdateRequest) { |
| renderNow(); |
| return true; |
| } |
| return QWindow::event(event); |
| } |
| //! [7] |
| |
| //! [6] |
| void RasterWindow::renderLater() |
| { |
| requestUpdate(); |
| } |
| //! [6] |
| |
| |
| //! [5] |
| void RasterWindow::resizeEvent(QResizeEvent *resizeEvent) |
| { |
| m_backingStore->resize(resizeEvent->size()); |
| } |
| //! [5] |
| |
| //! [2] |
| void RasterWindow::exposeEvent(QExposeEvent *) |
| { |
| if (isExposed()) |
| renderNow(); |
| } |
| //! [2] |
| |
| |
| //! [3] |
| 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(), QGradient::NightFade); |
| render(&painter); |
| painter.end(); |
| |
| m_backingStore->endPaint(); |
| m_backingStore->flush(rect); |
| } |
| //! [3] |
| |
| //! [4] |
| void RasterWindow::render(QPainter *painter) |
| { |
| painter->drawText(QRectF(0, 0, width(), height()), Qt::AlignCenter, QStringLiteral("QWindow")); |
| } |
| //! [4] |