add scrool or click actions

modules/Backlight.qml

@@ -9,6 +9,18 @@ Row {
 
     property int percent: 0
 
+    Process {
+        id: adjProc
+        property string cmd: ""
+        command: ["sh", "-c", cmd]
+        onRunningChanged: if (!running && cmd !== "") current.reload()
+    }
+
+    function adjust(delta) {
+        adjProc.cmd = delta > 0 ? "light -A 5" : "light -U 5";
+        adjProc.running = true;
+    }
+
     FileView {
         id: current
         path: "/sys/class/backlight/intel_backlight/brightness"
@@ -36,4 +48,8 @@ Row {
         font.family: M.Theme.fontFamily
         anchors.verticalCenter: parent.verticalCenter
     }
+
+    WheelHandler {
+        onWheel: event => root.adjust(event.angleDelta.y)
+    }
 }