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include/videowidget.h

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+#pragma once
+#include <QWidget>
+#include <QImage>
+#include <QLabel>
+#include <QPushButton>
+#include <QComboBox>
+#include <QHBoxLayout>
+#include <QVBoxLayout>
+#include <QThread>
+#include <QTimer>
+
+#include "v4l2worker.h"
+
+// VideoWidget shows a live preview of a V4L2 capture device.
+// It lives in the right-side panel, below the Tag Monitor.
+// Features:
+//   - Device selector (auto-enumerates /dev/video*)
+//   - Start / Stop capture
+//   - Freeze-frame toggle
+//   - Screenshot (saves current frame as PNG/JPG)
+//   - Frame is scaled to fit the widget while keeping aspect ratio
+class VideoWidget : public QWidget
+{
+    Q_OBJECT
+
+public:
+    explicit VideoWidget(QWidget *parent = nullptr);
+    ~VideoWidget();
+
+public:
+    // Called by MainWindow::closeEvent to guarantee orderly shutdown before
+    // widget destruction. Safe to call multiple times.
+    void shutdown();
+
+public slots:
+    void onNewFrame(const QImage &frame);
+
+private slots:
+    void onStartStop();
+    void onFreeze(bool frozen);
+    void onScreenshot();
+    void refreshDeviceList();
+
+protected:
+    void paintEvent(QPaintEvent *event) override;
+    void resizeEvent(QResizeEvent *event) override;
+
+private:
+    void setupUi();
+    void startCapture();
+    void stopCapture();
+    void updateScaled();
+
+    // Worker
+    QThread     *m_thread = nullptr;
+    V4l2Worker  *m_worker = nullptr;
+
+    // Current frame
+    QImage  m_frame;
+    QImage  m_scaled;
+    bool    m_frozen       = false;
+    bool    m_running      = false;
+    bool    m_shutdownDone = false;
+
+    // UI
+    QComboBox   *m_deviceCombo  = nullptr;
+    QPushButton *m_startBtn     = nullptr;
+    QPushButton *m_freezeBtn    = nullptr;
+    QPushButton *m_screenshotBtn= nullptr;
+    QLabel      *m_infoLabel    = nullptr;
+};