Track and display screen lock info

Record lock time, duration and count in CustomWidget and show a
lock-info overlay. setPaintingEnabled now logs lock/unlock times and
increments lock count. Emit screenLocked/screenUnlocked signals in
ScreenLockDetector. Minor UI and whitespace cleanup.

src/customwidget.cpp

@@ -12,6 +12,8 @@ CustomWidget::CustomWidget(QWidget *parent)
     , m_rotationAngle(0.0)
     , m_wavePhase(0.0)
     , m_startTime(QDateTime::currentDateTime())
+    , m_lastLockDuration(0)
+    , m_lockCount(0)
 {
     // 设置窗口属性
     setMinimumSize(600, 400);
@@ -40,11 +42,25 @@ void CustomWidget::setPaintingEnabled(bool enabled)
         if (enabled) {
             qDebug() << "Painting ENABLED - Resuming animations";
             m_animationTimer->start(16);
+
+            // 解锁：计算锁屏持续时间
+            if (m_lastLockTime.isValid()) {
+                QDateTime unlockTime = QDateTime::currentDateTime();
+                m_lastLockDuration = m_lastLockTime.secsTo(unlockTime);
+                qDebug() << "Screen was locked for" << m_lastLockDuration << "seconds";
+            }
+
             m_startTime = QDateTime::currentDateTime();
         } else {
             qDebug() << "Painting DISABLED - Stopping animations";
             m_animationTimer->stop();
+
+            // 锁屏：记录锁屏时间
             m_pauseTime = QDateTime::currentDateTime();
+            m_lastLockTime = m_pauseTime;
+            m_lockCount++;
+            qDebug() << "Screen locked at" << m_lastLockTime.toString("yyyy-MM-dd hh:mm:ss")
+                     << "- Lock count:" << m_lockCount;
         }
 
         // 触发重绘以更新状态显示
@@ -268,6 +284,10 @@ void CustomWidget::drawStatusInfo(QPainter &painter)
     painter.setPen(QColor(200, 255, 200));
     painter.drawText(statsRect.adjusted(10, 5, -10, -5), Qt::AlignLeft | Qt::AlignTop, stats);
 
+     if (m_lastLockTime.isValid()) {
+         drawLockInfo(painter);
+     }
+
     // 绘制提示信息
     painter.setPen(QColor(255, 255, 150));
     infoFont.setPointSize(11);
@@ -279,3 +299,47 @@ void CustomWidget::drawStatusInfo(QPainter &painter)
 
     painter.restore();
 }
+
+void CustomWidget::drawLockInfo(QPainter &painter)
+{
+     QFont infoFont = painter.font();
+    QRect lockInfoRect(10, 180, 350, 110);
+    painter.fillRect(lockInfoRect, QColor(60, 0, 60, 180));
+
+    painter.setPen(QColor(255, 200, 255));
+    infoFont.setBold(true);
+    infoFont.setPointSize(11);
+    painter.setFont(infoFont);
+    painter.drawText(lockInfoRect.adjusted(10, 5, -10, -5), Qt::AlignLeft | Qt::AlignTop,
+                    "Last Lock Info:");
+
+    infoFont.setBold(false);
+    infoFont.setPointSize(11);
+    painter.setFont(infoFont);
+    painter.setPen(QColor(255, 220, 255));
+
+    // 格式化锁屏时长
+    QString durationStr;
+    if (m_lastLockDuration < 60) {
+        durationStr = QString("%1 seconds").arg(m_lastLockDuration);
+    } else if (m_lastLockDuration < 3600) {
+        int minutes = m_lastLockDuration / 60;
+        int seconds = m_lastLockDuration % 60;
+        durationStr = QString("%1m %2s").arg(minutes).arg(seconds);
+    } else {
+        int hours = m_lastLockDuration / 3600;
+        int minutes = (m_lastLockDuration % 3600) / 60;
+        int seconds = m_lastLockDuration % 60;
+        durationStr = QString("%1h %2m %3s").arg(hours).arg(minutes).arg(seconds);
+    }
+
+    QString lockInfo = QString(
+        "\nLock Time: %1\n"
+        "Duration: %2\n"
+        "Total Locks: %3"
+    ).arg(m_lastLockTime.toString("yyyy-MM-dd hh:mm:ss"))
+        .arg(durationStr)
+        .arg(m_lockCount);
+
+    painter.drawText(lockInfoRect.adjusted(10, 25, -10, -5), Qt::AlignLeft | Qt::AlignTop, lockInfo);
+}

src/customwidget.h

@@ -83,6 +83,12 @@ private:
      */
     void drawStatusInfo(QPainter &painter);
 
+    /**
+     * @brief 绘制锁屏信息
+     * @param painter 绘制器
+     */
+    void drawLockInfo(QPainter &painter);
+
 private:
     QTimer *m_animationTimer;    // 动画定时器
     bool m_paintingEnabled;      // 绘制是否启用
@@ -91,6 +97,9 @@ private:
     double m_wavePhase;          // 波浪相位
     QDateTime m_startTime;       // 开始时间
     QDateTime m_pauseTime;       // 暂停时间
+    QDateTime m_lastLockTime;    // 上次锁屏时间
+    qint64 m_lastLockDuration;   // 上次锁屏持续时长（秒）
+    int m_lockCount;             // 锁屏次数
 };
 
 #endif // CUSTOMWIDGET_H

src/mainwindow.cpp

@@ -148,7 +148,6 @@ void MainWindow::onScreenLocked()
     // 停止绘制
     if (m_customWidget) {
         m_customWidget->setPaintingEnabled(false);
-        m_customWidget->resetFrameCount();
     }
 
     updateStatusDisplay();

src/screenlockdetector.cpp

@@ -78,12 +78,12 @@ void ScreenLockDetector::setLockState(bool locked)
         qDebug() << "## Screen lock state changed:" << (locked ? "LOCKED" : "UNLOCKED");
         qDebug() << "##################################################";
 
-        // emit lockStateChanged(locked);
+        emit lockStateChanged(locked);
 
         if (locked) {
             emit screenLocked();
         } else {
-            // emit screenUnlocked();
+            emit screenUnlocked();
         }
     }
 }