Vollbildmodus für HDMI

src/videowidget.cpp

@@ -9,6 +9,71 @@
 #include <QMetaObject>
 #include <QResizeEvent>
 #include <QMessageBox>
+#include <QKeyEvent>
+#include <QMouseEvent>
+#include <QCloseEvent>
+#include <QScreen>
+
+// ── FullscreenVideoView ────────────────────────────────────────────────
+
+FullscreenVideoView::FullscreenVideoView(QWidget *parent)
+    : QWidget(parent, Qt::Window)
+{
+    setWindowTitle(tr("uartscope - Video (Fullscreen)"));
+    setAttribute(Qt::WA_DeleteOnClose);
+    setCursor(Qt::BlankCursor);
+
+    QPalette pal = palette();
+    pal.setColor(QPalette::Window, Qt::black);
+    setPalette(pal);
+    setAutoFillBackground(true);
+}
+
+void FullscreenVideoView::setFrame(const QImage &frame)
+{
+    m_frame = frame;
+    update();
+}
+
+void FullscreenVideoView::paintEvent(QPaintEvent *)
+{
+    QPainter p(this);
+    p.fillRect(rect(), Qt::black);
+
+    if (m_frame.isNull()) {
+        p.setPen(QColor(0x44, 0x44, 0x44));
+        p.setFont(QFont("Sans", 14));
+        p.drawText(rect(), Qt::AlignCenter, tr("No signal"));
+        return;
+    }
+
+    const QImage scaled = m_frame.scaled(size(), Qt::KeepAspectRatio,
+                                          Qt::SmoothTransformation);
+    const QPoint origin((width()  - scaled.width())  / 2,
+                         (height() - scaled.height()) / 2);
+    p.drawImage(origin, scaled);
+}
+
+void FullscreenVideoView::keyPressEvent(QKeyEvent *event)
+{
+    if (event->key() == Qt::Key_Escape || event->key() == Qt::Key_F11)
+        close();
+    else
+        QWidget::keyPressEvent(event);
+}
+
+void FullscreenVideoView::mouseDoubleClickEvent(QMouseEvent *)
+{
+    close();
+}
+
+void FullscreenVideoView::closeEvent(QCloseEvent *event)
+{
+    emit closed();
+    QWidget::closeEvent(event);
+}
+
+// ── VideoWidget ─────────────────────────────────────────────────────────
 
 static QStringList enumerateVideoDevices()
 {
@@ -44,6 +109,8 @@ VideoWidget::VideoWidget(QWidget *parent)
         m_infoLabel->setText(tr("Stopped"));
         if (m_recording)
             stopRecording();
+        if (m_fullscreenView)
+            m_fullscreenView->close();
         update();
     });
     connect(m_worker, &V4l2Worker::errorOccurred,  this, [this](const QString &msg) {
@@ -63,6 +130,9 @@ void VideoWidget::shutdown()
         return;
     m_shutdownDone = true;
 
+    if (m_fullscreenView)
+        m_fullscreenView->close();
+
     if (m_recording)
         stopRecording();
 
@@ -119,12 +189,18 @@ void VideoWidget::setupUi()
     m_recordBtn->setToolTip(tr("Record the live preview to an MP4 file (requires ffmpeg)"));
     connect(m_recordBtn, &QPushButton::toggled, this, &VideoWidget::onRecordToggled);
 
+    m_fullscreenBtn = new QPushButton(tr("⛶"), this);
+    m_fullscreenBtn->setMaximumWidth(28);
+    m_fullscreenBtn->setToolTip(tr("Show video fullscreen (Esc or double-click to exit)"));
+    connect(m_fullscreenBtn, &QPushButton::clicked, this, &VideoWidget::onFullscreenToggle);
+
     ctrlRow->addWidget(m_deviceCombo, 1);
     ctrlRow->addWidget(refreshBtn);
     ctrlRow->addWidget(m_startBtn);
     ctrlRow->addWidget(m_freezeBtn);
     ctrlRow->addWidget(m_screenshotBtn);
     ctrlRow->addWidget(m_recordBtn);
+    ctrlRow->addWidget(m_fullscreenBtn);
     layout->addLayout(ctrlRow);
 
     m_infoLabel = new QLabel(tr("No device started"), this);
@@ -229,6 +305,9 @@ void VideoWidget::onNewFrame(const QImage &frame)
     m_frame = frame;
     updateScaled();
     update();
+
+    if (m_fullscreenView)
+        m_fullscreenView->setFrame(frame);
 }
 
 void VideoWidget::clearFrame()
@@ -321,6 +400,28 @@ void VideoWidget::onRecordToggled(bool checked)
         stopRecording();
 }
 
+void VideoWidget::onFullscreenToggle()
+{
+    // Already open - a second click just closes it again.
+    if (m_fullscreenView) {
+        m_fullscreenView->close();
+        return;
+    }
+
+    m_fullscreenView = new FullscreenVideoView();
+    connect(m_fullscreenView, &FullscreenVideoView::closed, this, [this] {
+        m_fullscreenView = nullptr;
+    });
+
+    // Put it on whichever screen the main window currently lives on
+    // (useful when a second/HDMI display is attached), then go fullscreen.
+    if (QScreen *screen = this->screen())
+        m_fullscreenView->setGeometry(screen->geometry());
+
+    m_fullscreenView->setFrame(m_frame);
+    m_fullscreenView->showFullScreen();
+}
+
 void VideoWidget::startRecording()
 {
     if (m_frame.isNull()) {