feat: added sleep mode to the reader, in some cases there is no need for reads since the widget is not visualizing anything. In this case, the reader could go to sleep mode and be active only when popup is open. It's available only for the sensor module for now.

Kit/Widgets/Label.swift

@@ -11,7 +11,7 @@
 
 import Cocoa
 
-internal class Label: WidgetWrapper {
+public class Label: WidgetWrapper {
     private var label: String
     
     internal init(title: String, config: NSDictionary) {

Kit/module/reader.swift

@@ -12,8 +12,9 @@
 import Cocoa
 
 public protocol Reader_p {
-    var optional: Bool { get }
     var popup: Bool { get }
+    var preview: Bool { get }
+    var sleep: Bool { get }
     
     func setup()
     func read()
@@ -28,6 +29,7 @@ public protocol Reader_p {
     
     func initStoreValues(title: String)
     func setInterval(_ value: Int)
+    func sleepMode(state: Bool)
 }
 
 public protocol ReaderInternal_p {
@@ -55,6 +57,8 @@ open class Reader<T: Codable>: NSObject, ReaderInternal_p {
     public var defaultInterval: Int = 1
     public var optional: Bool = false
     public var popup: Bool = false
+    public var preview: Bool = false
+    public var sleep: Bool = false
     
     public var callbackHandler: (T?) -> Void
     
@@ -73,8 +77,9 @@ open class Reader<T: Codable>: NSObject, ReaderInternal_p {
     
     private var lastDBWrite: Date? = nil
     
-    public init(_ module: ModuleType, popup: Bool = false, history: Bool = false, callback: @escaping (T?) -> Void = {_ in }) {
+    public init(_ module: ModuleType, popup: Bool = false, preview: Bool = false, history: Bool = false, callback: @escaping (T?) -> Void = {_ in }) {
         self.popup = popup
+        self.preview = preview
         self.module = module
         self.history = history
         self.callbackHandler = callback
@@ -121,7 +126,7 @@ open class Reader<T: Codable>: NSObject, ReaderInternal_p {
     open func terminate() {}
     
     open func start() {
-        if self.popup && self.locked {
+        if (self.popup || self.preview) && self.locked {
             DispatchQueue.global(qos: .background).async {
                 self.read()
             }
@@ -169,6 +174,19 @@ open class Reader<T: Codable>: NSObject, ReaderInternal_p {
     public func save(_ value: T) {
         DB.shared.insert(key: "\(self.module.stringValue)@\(self.name)", value: value, ts: self.history, force: true)
     }
+    
+    public func sleepMode(state: Bool) {
+        guard state != self.sleep else { return }
+
+        debug("Sleep mode: \(state ? "on" : "off")", log: self.log)
+        self.sleep = state
+
+        if state {
+            self.pause()
+        } else {
+            self.start()
+        }
+    }
 }
 
 extension Reader: Reader_p {