added lightning bolt

Main.qml

@@ -54,11 +54,16 @@ Window {
     // ─────────────────────────────────────────────────────────────
 
     property int batteryPercent: systemInfo.batteryPercent
+    property bool charging: systemInfo.charging
 
     Item {
         id: battery
 
-        width: batteryIcon.width + 18 + batteryText.width
+        width: batteryIcon.width
+            + (root.charging ? chargingIcon.width + 12 : 0)
+            + 18
+            + batteryText.width
+
         height: 72
 
         anchors {
@@ -134,11 +139,35 @@ Window {
         }
 
         Text {
-            id: batteryText
+            id: chargingIcon
 
             anchors {
                 left: batteryIcon.right
-                leftMargin: 18
+                leftMargin: 12
+                verticalCenter: parent.verticalCenter
+            }
+
+            visible: root.charging
+            text: "⚡"
+
+            color: "#ffffff"
+
+            font {
+                pixelSize: 38
+                weight: Font.Bold
+            }
+        }
+
+        Text {
+            id: batteryText
+
+            anchors {
+                left: root.charging
+                    ? chargingIcon.right
+                    : batteryIcon.right
+
+                leftMargin: root.charging ? 12 : 18
+
                 verticalCenter: parent.verticalCenter
             }
             

SystemInfo.cpp

@@ -2,6 +2,7 @@
 
 #include <QDir>
 #include <QFile>
+#include <QFileInfo>
 #include <QTextStream>
 
 SystemInfo::SystemInfo(QObject *parent)
@@ -16,7 +17,8 @@ SystemInfo::SystemInfo(QObject *parent)
             this,
             &SystemInfo::updateBattery);
 
-    // Battery percentage doesn't need millisecond precision.
+    // Battery percentage and charging state don't need
+    // millisecond precision.
     m_batteryTimer.start(10000);
 }
 
@@ -25,6 +27,11 @@ int SystemInfo::batteryPercent() const
     return m_batteryPercent;
 }
 
+bool SystemInfo::charging() const
+{
+    return m_charging;
+}
+
 QString SystemInfo::findBatteryCapacityPath() const
 {
     QDir powerSupply("/sys/class/power_supply");
@@ -64,26 +71,52 @@ void SystemInfo::updateBattery()
     if (m_capacityPath.isEmpty())
         return;
 
+    // ─────────────────────────────────────────────────────────────
+    // Battery percentage
+    // ─────────────────────────────────────────────────────────────
+
     QFile capacityFile(m_capacityPath);
 
-    if (!capacityFile.open(QIODevice::ReadOnly | QIODevice::Text))
-        return;
+    if (capacityFile.open(QIODevice::ReadOnly | QIODevice::Text)) {
+        bool ok = false;
 
-    bool ok = false;
+        int percent =
+            QString::fromUtf8(capacityFile.readAll())
+                .trimmed()
+                .toInt(&ok);
 
-    int percent =
-        QString::fromUtf8(capacityFile.readAll())
-            .trimmed()
-            .toInt(&ok);
+        if (ok) {
+            percent = qBound(0, percent, 100);
 
-    if (!ok)
-        return;
+            if (percent != m_batteryPercent) {
+                m_batteryPercent = percent;
+                emit batteryPercentChanged();
+            }
+        }
+    }
 
-    percent = qBound(0, percent, 100);
+    // ─────────────────────────────────────────────────────────────
+    // Charging state
+    // ─────────────────────────────────────────────────────────────
 
-    if (percent == m_batteryPercent)
-        return;
+    // m_capacityPath is something like:
+    // /sys/class/power_supply/battery/capacity
+    //
+    // The status file lives beside it.
+    const QString batteryDirectory =
+        QFileInfo(m_capacityPath).absolutePath();
 
-    m_batteryPercent = percent;
-    emit batteryPercentChanged();
+    QFile statusFile(batteryDirectory + "/status");
+
+    if (statusFile.open(QIODevice::ReadOnly | QIODevice::Text)) {
+        const QString status =
+            QString::fromUtf8(statusFile.readAll()).trimmed();
+
+        const bool charging = (status == "Charging");
+
+        if (charging != m_charging) {
+            m_charging = charging;
+            emit chargingChanged();
+        }
+    }
 }

SystemInfo.h

@@ -8,17 +8,25 @@ class SystemInfo : public QObject
 {
     Q_OBJECT
     Q_PROPERTY(int batteryPercent
-               READ batteryPercent
-               NOTIFY batteryPercentChanged)
+            READ batteryPercent
+            NOTIFY batteryPercentChanged)
+
+    Q_PROPERTY(bool charging
+            READ charging
+            NOTIFY chargingChanged)
 
 public:
     explicit SystemInfo(QObject *parent = nullptr);
 
     int batteryPercent() const;
 
+    bool charging() const;
+
 signals:
     void batteryPercentChanged();
 
+    void chargingChanged();
+
 private slots:
     void updateBattery();
 
@@ -28,4 +36,6 @@ private:
     int m_batteryPercent = -1;
     QString m_capacityPath;
     QTimer m_batteryTimer;
+
+    bool m_charging = false;
 };