window.cpp 范例文件

embeddedqwindow/window.cpp
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#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++) , m_backingStore(0) { initialize(); } Window::Window(QWindow *parent) : QWindow(parent) , m_backgroundColorIndex(colorIndexId++) , m_backingStore(0) { 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)); setMaximumSize(QSize(800, 600)); } setFlags(flags() | Qt::SubWindow); // Don't create a toplevel window. 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); p.setRenderHint(QPainter::Antialiasing); p.drawLine(m_lastPos, event->pos()); m_lastPos = event->pos(); } 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" << width << height; int width = qMax(geometry().width(), old.width()); int height = qMax(geometry().height(), old.height()); if (width > old.width() || height > old.height()) { m_image = QImage(width, height, QImage::Format_RGB32); 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() { if (!m_backingStore) return; 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); m_backingStore->endPaint(); m_backingStore->flush(rect); }