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src/videowidget.cpp

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+#include "videowidget.h"
+
+#include <QPainter>
+#include <QFileDialog>
+#include <QDir>
+#include <QDateTime>
+#include <QStandardPaths>
+#include <QMetaObject>
+#include <QResizeEvent>
+
+// Enumerate /dev/video* entries
+static QStringList enumerateVideoDevices()
+{
+    QStringList devices;
+    const QDir dev("/dev");
+    const auto entries = dev.entryList({"video*"}, QDir::System, QDir::Name);
+    for (const auto &e : entries)
+        devices << "/dev/" + e;
+    return devices;
+}
+
+// ── ctor / dtor ───────────────────────────────────────────────────────────────
+
+VideoWidget::VideoWidget(QWidget *parent)
+    : QWidget(parent)
+{
+    setupUi();
+
+    m_thread = new QThread(this);
+    m_worker = new V4l2Worker();
+    m_worker->moveToThread(m_thread);
+
+    connect(m_thread, &QThread::finished, m_worker, &QObject::deleteLater);
+
+    connect(m_worker, &V4l2Worker::newFrame,        this, &VideoWidget::onNewFrame,
+            Qt::QueuedConnection);
+    connect(m_worker, &V4l2Worker::captureStarted,  this, [this](const QString &dev, int w, int h, const QString &fmt) {
+        m_infoLabel->setText(tr("%1  %2×%3  %4").arg(dev).arg(w).arg(h).arg(fmt));
+        m_running = true;
+        m_startBtn->setText(tr("■ Stop"));
+    });
+    connect(m_worker, &V4l2Worker::captureStopped,  this, [this] {
+        m_running = false;
+        m_startBtn->setText(tr("▶ Start"));
+        m_infoLabel->setText(tr("Stopped"));
+        update();
+    });
+    connect(m_worker, &V4l2Worker::errorOccurred,   this, [this](const QString &msg) {
+        m_infoLabel->setText(tr("Error: %1").arg(msg));
+        m_running = false;
+        m_startBtn->setText(tr("▶ Start"));
+    });
+
+    m_thread->start();
+}
+
+void VideoWidget::shutdown()
+{
+    if (m_shutdownDone)
+        return;
+    m_shutdownDone = true;
+
+    // stopCapture() sets m_running=false and joins the std::thread internally.
+    // Must happen before we quit the Qt event thread.
+    m_worker->stopCapture();
+
+    if (m_thread && m_thread->isRunning()) {
+        m_thread->quit();
+        m_thread->wait(5000);
+        if (m_thread->isRunning())
+            m_thread->terminate();
+    }
+}
+
+VideoWidget::~VideoWidget()
+{
+    shutdown();
+}
+
+// ── UI setup ─────────────────────────────────────────────────────────────────
+
+void VideoWidget::setupUi()
+{
+    setMinimumHeight(140);
+
+    auto *layout = new QVBoxLayout(this);
+    layout->setContentsMargins(2, 2, 2, 2);
+    layout->setSpacing(3);
+
+    // ── Controls row ──────────────────────────────────────────────────────────
+    auto *ctrlRow = new QHBoxLayout();
+    ctrlRow->setSpacing(4);
+
+    m_deviceCombo = new QComboBox(this);
+    m_deviceCombo->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
+    refreshDeviceList();
+
+    auto *refreshBtn = new QPushButton("↻", this);
+    refreshBtn->setMaximumWidth(26);
+    refreshBtn->setToolTip(tr("Refresh device list"));
+    connect(refreshBtn, &QPushButton::clicked, this, &VideoWidget::refreshDeviceList);
+
+    m_startBtn = new QPushButton(tr("▶ Start"), this);
+    m_startBtn->setMaximumWidth(70);
+    connect(m_startBtn, &QPushButton::clicked, this, &VideoWidget::onStartStop);
+
+    m_freezeBtn = new QPushButton(tr("❚❚ Freeze"), this);
+    m_freezeBtn->setCheckable(true);
+    m_freezeBtn->setMaximumWidth(80);
+    connect(m_freezeBtn, &QPushButton::toggled, this, &VideoWidget::onFreeze);
+
+    m_screenshotBtn = new QPushButton(tr("📷"), this);
+    m_screenshotBtn->setMaximumWidth(32);
+    m_screenshotBtn->setToolTip(tr("Save screenshot (PNG/JPG)"));
+    connect(m_screenshotBtn, &QPushButton::clicked, this, &VideoWidget::onScreenshot);
+
+    ctrlRow->addWidget(m_deviceCombo, 1);
+    ctrlRow->addWidget(refreshBtn);
+    ctrlRow->addWidget(m_startBtn);
+    ctrlRow->addWidget(m_freezeBtn);
+    ctrlRow->addWidget(m_screenshotBtn);
+    layout->addLayout(ctrlRow);
+
+    // ── Info label ────────────────────────────────────────────────────────────
+    m_infoLabel = new QLabel(tr("No device started"), this);
+    m_infoLabel->setStyleSheet("color: gray; font-size: 9px;");
+    layout->addWidget(m_infoLabel);
+
+    // The video frame is drawn directly in paintEvent – no QLabel needed.
+    // We leave stretch space for it.
+    layout->addStretch(1);
+}
+
+// ── Slots ─────────────────────────────────────────────────────────────────────
+
+void VideoWidget::onStartStop()
+{
+    if (m_running)
+        stopCapture();
+    else
+        startCapture();
+}
+
+void VideoWidget::onFreeze(bool frozen)
+{
+    m_frozen = frozen;
+    m_freezeBtn->setText(frozen ? tr("▶ Live") : tr("❚❚ Freeze"));
+}
+
+void VideoWidget::onScreenshot()
+{
+    if (m_frame.isNull())
+        return;
+
+    const QString defaultName =
+        QStandardPaths::writableLocation(QStandardPaths::PicturesLocation)
+        + "/uartscope_"
+        + QDateTime::currentDateTime().toString("yyyyMMdd_hhmmss")
+        + ".png";
+
+    const QString path = QFileDialog::getSaveFileName(
+        this, tr("Save screenshot"), defaultName,
+        tr("PNG Image (*.png);;JPEG Image (*.jpg *.jpeg)"));
+
+    if (!path.isEmpty())
+        m_frame.save(path);
+}
+
+void VideoWidget::onNewFrame(const QImage &frame)
+{
+    if (m_frozen)
+        return;
+    m_frame = frame;
+    updateScaled();
+    update();   // trigger paintEvent
+}
+
+void VideoWidget::refreshDeviceList()
+{
+    const QString current = m_deviceCombo->currentText();
+    m_deviceCombo->clear();
+    const auto devices = enumerateVideoDevices();
+    for (const auto &d : devices)
+        m_deviceCombo->addItem(d);
+    // Restore previous selection if still present
+    const int idx = m_deviceCombo->findText(current);
+    if (idx >= 0)
+        m_deviceCombo->setCurrentIndex(idx);
+}
+
+// ── Capture start/stop ────────────────────────────────────────────────────────
+
+void VideoWidget::startCapture()
+{
+    const QString dev = m_deviceCombo->currentText();
+    if (dev.isEmpty())
+        return;
+    m_frame = QImage();
+    m_scaled = QImage();
+    // startCapture blocks in the worker thread until stopCapture() is called
+    QMetaObject::invokeMethod(m_worker, "startCapture",
+        Qt::QueuedConnection,
+        Q_ARG(QString, dev),
+        Q_ARG(int, 1920),
+        Q_ARG(int, 1080));
+}
+
+void VideoWidget::stopCapture()
+{
+    QMetaObject::invokeMethod(m_worker, "stopCapture", Qt::QueuedConnection);
+}
+
+// ── Paint ─────────────────────────────────────────────────────────────────────
+
+void VideoWidget::updateScaled()
+{
+    // Video area = widget height minus the two control rows (~55 px)
+    const QRect videoRect(0, 55, width(), height() - 55);
+    if (videoRect.width() < 10 || videoRect.height() < 10 || m_frame.isNull())
+        return;
+
+    m_scaled = m_frame.scaled(videoRect.size(), Qt::KeepAspectRatio,
+                               Qt::SmoothTransformation);
+}
+
+void VideoWidget::paintEvent(QPaintEvent *)
+{
+    QPainter p(this);
+
+    // Background
+    p.fillRect(rect(), QColor(0x10, 0x10, 0x10));
+
+    if (m_scaled.isNull()) {
+        p.setPen(QColor(0x44, 0x44, 0x44));
+        p.drawText(rect(), Qt::AlignCenter,
+                   m_running ? tr("Waiting for frames…") : tr("No signal"));
+        return;
+    }
+
+    // Centre the scaled frame in the video area
+    const QRect videoRect(0, 55, width(), height() - 55);
+    const QPoint origin(
+        videoRect.left() + (videoRect.width()  - m_scaled.width())  / 2,
+        videoRect.top()  + (videoRect.height() - m_scaled.height()) / 2);
+    p.drawImage(origin, m_scaled);
+
+    // Frozen overlay
+    if (m_frozen) {
+        p.setPen(QColor(0xff, 0xcc, 0x00));
+        p.setFont(QFont("Sans", 9, QFont::Bold));
+        p.drawText(videoRect.adjusted(4, 4, -4, -4),
+                   Qt::AlignTop | Qt::AlignRight, tr("FREEZE"));
+    }
+}
+
+void VideoWidget::resizeEvent(QResizeEvent *event)
+{
+    QWidget::resizeEvent(event);
+    updateScaled();
+}