feat: added No Bluetooth devices are available message to the Bluetooth module settings and popup view

Modules/Bluetooth/popup.swift

@@ -14,9 +14,10 @@ import Kit
 
 internal class Popup: NSStackView, Popup_p {
     public var sizeCallback: ((NSSize) -> Void)? = nil
+    private let emptyView: EmptyView = EmptyView(height: 30, isHidden: false)
     
     public init() {
-        super.init(frame: NSRect(x: 0, y: 0, width: Constants.Popup.width, height: 0))
+        super.init(frame: NSRect(x: 0, y: 0, width: Constants.Popup.width, height: 30))
         
         self.orientation = .vertical
         self.spacing = Constants.Popup.margins
@@ -27,6 +28,20 @@ internal class Popup: NSStackView, Popup_p {
     }
     
     internal func batteryCallback(_ list: [BLEDevice]) {
+        defer {
+            if list.isEmpty && self.emptyView.superview == nil {
+                self.addArrangedSubview(self.emptyView)
+            } else if !list.isEmpty && self.emptyView.superview != nil {
+                self.emptyView.removeFromSuperview()
+            }
+            
+            let h = self.arrangedSubviews.map({ $0.bounds.height + self.spacing }).reduce(0, +) - self.spacing
+            if h > 0 && self.frame.size.height != h {
+                self.setFrameSize(NSSize(width: self.frame.width, height: h))
+                self.sizeCallback?(self.frame.size)
+            }
+        }
+        
         var views = self.subviews.filter{ $0 is BLEView }.map{ $0 as! BLEView }
         if list.count < views.count && !views.isEmpty {
             views.forEach{ $0.removeFromSuperview() }
@@ -45,12 +60,6 @@ internal class Popup: NSStackView, Popup_p {
                 ))
             }
         }
-        
-        let h = self.arrangedSubviews.map({ $0.bounds.height + self.spacing }).reduce(0, +) - self.spacing
-        if h > 0 && self.frame.size.height != h {
-            self.setFrameSize(NSSize(width: self.frame.width, height: h))
-            self.sizeCallback?(self.frame.size)
-        }
     }
 }
 

Modules/Bluetooth/readers.swift

@@ -258,8 +258,6 @@ internal class DevicesReader: Reader<[BLEDevice]>, CBCentralManagerDelegate, CBP
         
         self.characteristicsDict[peripheral.identifier] = batteryCharacteristics
         peripheral.readValue(for: batteryCharacteristics)
-        
-        debug("\(peripheral.identifier): discover battery service")
     }
     
     func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) {

Modules/Bluetooth/settings.swift

@@ -16,6 +16,7 @@ internal class Settings: NSStackView, Settings_v {
     public var callback: (() -> Void) = {}
     
     private var list: [String: Bool] = [:]
+    private let emptyView: EmptyView = EmptyView()
     
     public init() {
         super.init(frame: NSRect(x: 0, y: 0, width: 0, height: 0))
@@ -31,6 +32,7 @@ internal class Settings: NSStackView, Settings_v {
         self.spacing = Constants.Settings.margin
         
         self.addArrangedSubview(NSView())
+        self.addArrangedSubview(self.emptyView)
     }
     
     required init?(coder: NSCoder) {
@@ -41,10 +43,17 @@ internal class Settings: NSStackView, Settings_v {
     
     internal func setList(_ list: [BLEDevice]) {
         if self.list.count != list.count && !self.list.isEmpty {
-            self.subviews.forEach{ $0.removeFromSuperview() }
+            self.subviews.filter({ $0 is NSStackView && ($0 as! NSStackView).identifier != NSUserInterfaceItemIdentifier(rawValue: "emptyView") }).forEach{ $0.removeFromSuperview() }
             self.list = [:]
         }
         
+        if list.isEmpty && self.emptyView.isHidden {
+            self.emptyView.isHidden = false
+            return
+        } else if !list.isEmpty && !self.emptyView.isHidden {
+            self.emptyView.isHidden = true
+        }
+        
         list.forEach { (d: BLEDevice) in
             if self.list[d.id] == nil {
                 let row: NSView = toggleSettingRow(
@@ -75,3 +84,32 @@ internal class Settings: NSStackView, Settings_v {
         self.callback()
     }
 }
+
+internal class EmptyView: NSStackView {
+    public init(height: CGFloat = 120, isHidden: Bool = false) {
+        super.init(frame: NSRect())
+        
+        self.heightAnchor.constraint(equalToConstant: height).isActive = true
+        
+        self.translatesAutoresizingMaskIntoConstraints = true
+        self.orientation = .vertical
+        self.distribution = .fillEqually
+        self.isHidden = isHidden
+        self.identifier = NSUserInterfaceItemIdentifier(rawValue: "emptyView")
+        
+        let textView: NSTextView = NSTextView()
+        textView.heightAnchor.constraint(equalToConstant: (height/2)+6).isActive = true
+        textView.alignment = .center
+        textView.isEditable = false
+        textView.isSelectable = false
+        textView.drawsBackground = false
+        textView.string = localizedString("No Bluetooth devices are available")
+        
+        self.addArrangedSubview(NSView())
+        self.addArrangedSubview(textView)
+    }
+    
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+}