修复开机没有墨水也进自检的问题；为状态label添加长文本滚动逻辑

mainwidget.cpp

@@ -34,6 +34,8 @@
 #include "scene/PicCounterItem.h"
 #include <QElapsedTimer>
 #include <QScroller>
+#include <QFontMetrics>
+#include <QPainter>
 
 extern MyInputMethod *myInputMethod;
 unsigned char test_flag,open_close;
@@ -102,6 +104,15 @@ MainWidget::MainWidget(QWidget* parent)
     m_reclaimOpenBtnFlashTimer = new QTimer(this);
     connect(m_reclaimOpenBtnFlashTimer, &QTimer::timeout, this, &MainWidget::onReclaimOpenBtnFlashTimerTimeout);
     m_reclaimOpenBtnFlashTimer->setInterval(500);
+
+    m_nozzleStateMarqueeTimer = new QTimer(this);
+    m_nozzleStateMarqueeTimer->setInterval(30);
+    connect(m_nozzleStateMarqueeTimer, &QTimer::timeout, this, &MainWidget::onNozzleStateMarqueeTimeout);
+
+    if (ui.lb_nozzleState) {
+        ui.lb_nozzleState->installEventFilter(this);
+        ui.lb_nozzleState->setText(" ");
+    }
 }
 
 MainWidget::~MainWidget()
@@ -391,7 +402,104 @@ void MainWidget::setRunStatus(QString str)
             return;
         }
     
-    ui.lb_nozzleState->setText(str);
+    updateNozzleStateMarquee(str);
+}
+
+void MainWidget::stopNozzleStateMarquee()
+{
+    if (m_nozzleStateMarqueeTimer && m_nozzleStateMarqueeTimer->isActive()) {
+        m_nozzleStateMarqueeTimer->stop();
+    }
+    m_nozzleStateFullText.clear();
+    m_nozzleStateMarqueeOffsetPx = 0;
+    m_nozzleStateMarqueeTextWidth = 0;
+    m_nozzleStateMarqueeGapPx = 0;
+    m_nozzleStateMarqueeEnabled = false;
+    if (ui.lb_nozzleState) {
+        ui.lb_nozzleState->setText(QString());
+        ui.lb_nozzleState->update();
+    }
+}
+
+void MainWidget::updateNozzleStateMarquee(const QString& str)
+{
+    if (!ui.lb_nozzleState)
+        return;
+
+    QString text = str;
+    if (text.isEmpty()) {
+        stopNozzleStateMarquee();
+        ui.lb_nozzleState->setText(text);
+        return;
+    }
+
+    QFontMetrics fm(ui.lb_nozzleState->font());
+    const int labelWidth = ui.lb_nozzleState->contentsRect().width();
+    if (labelWidth <= 0 || fm.horizontalAdvance(text) <= labelWidth) {
+        stopNozzleStateMarquee();
+        ui.lb_nozzleState->setText(text);
+        return;
+    }
+
+    // 长文本循环滚动，按像素偏移绘制
+    m_nozzleStateFullText = text;
+    m_nozzleStateMarqueeTextWidth = fm.horizontalAdvance(text);
+    m_nozzleStateMarqueeGapPx = qMax(20, labelWidth / 2);
+    m_nozzleStateMarqueeOffsetPx = 0;
+    m_nozzleStateMarqueeEnabled = true;
+    ui.lb_nozzleState->setText(QString());
+    ui.lb_nozzleState->update();
+
+    if (!m_nozzleStateMarqueeTimer->isActive()) {
+        m_nozzleStateMarqueeTimer->start();
+    }
+}
+
+void MainWidget::onNozzleStateMarqueeTimeout()
+{
+    if (!m_nozzleStateMarqueeEnabled || !ui.lb_nozzleState) {
+        return;
+    }
+
+    const int labelWidth = ui.lb_nozzleState->contentsRect().width();
+    if (labelWidth <= 0 || m_nozzleStateMarqueeTextWidth <= 0) {
+        stopNozzleStateMarquee();
+        return;
+    }
+
+    const int totalWidth = m_nozzleStateMarqueeTextWidth + m_nozzleStateMarqueeGapPx;
+    m_nozzleStateMarqueeOffsetPx += 1;
+    if (m_nozzleStateMarqueeOffsetPx >= totalWidth) {
+        m_nozzleStateMarqueeOffsetPx = 0;
+    }
+
+    ui.lb_nozzleState->update();
+}
+
+bool MainWidget::eventFilter(QObject *watched, QEvent *event)
+{
+    if (watched == ui.lb_nozzleState && m_nozzleStateMarqueeEnabled) {
+        if (event->type() == QEvent::Paint) {
+            QPainter painter(ui.lb_nozzleState);
+            painter.setRenderHint(QPainter::TextAntialiasing, true);
+
+            const QRect rect = ui.lb_nozzleState->contentsRect();
+            painter.fillRect(rect, ui.lb_nozzleState->palette().window());
+            painter.setPen(ui.lb_nozzleState->palette().color(QPalette::WindowText));
+            painter.setFont(ui.lb_nozzleState->font());
+
+            const QFontMetrics fm(ui.lb_nozzleState->font());
+            const int baseline = (rect.height() + fm.ascent() - fm.descent()) / 2;
+            const int startX = rect.left() - m_nozzleStateMarqueeOffsetPx;
+            const int textY = rect.top() + baseline;
+
+            painter.drawText(startX, textY, m_nozzleStateFullText);
+            painter.drawText(startX + m_nozzleStateMarqueeTextWidth + m_nozzleStateMarqueeGapPx, textY, m_nozzleStateFullText);
+            return true;
+        }
+    }
+
+    return QWidget::eventFilter(watched, event);
 }
 
 /* 生成字模数据  */