UI: Refine Custom HUD and Menu Slider aesthetics

- Make Custom HUD background transparent to avoid square opaque corners
- Update custom HUD icon and slider colors for better macOS integration
- Adjust Menu Slider icon padding and layout constraints

MonitorControl/Support/CustomHUD.swift

@@ -41,7 +41,7 @@ class CustomHUDManager {
     private func createHUDWindow(displayID: CGDirectDisplayID) -> NSWindow {
         let window = NSPanel(
             contentRect: NSRect(x: 0, y: 0, width: 260, height: 56),
-            styleMask: [.nonactivatingPanel, .hudWindow],
+            styleMask: [.nonactivatingPanel],
             backing: .buffered,
             defer: false
         )
@@ -96,6 +96,13 @@ class CustomHUDManager {
     private func createHUDContentView(type: HUDType, value: Float, maxValue: Float) -> NSView {
         let w: CGFloat = 260
         let h: CGFloat = 56
+        
+        // Wrap the visual effect view in a transparent root view.
+        // This ensures the NSWindow doesn't force a square opaque background on the corners.
+        let rootView = NSView(frame: NSRect(x: 0, y: 0, width: w, height: h))
+        rootView.wantsLayer = true
+        rootView.layer?.backgroundColor = NSColor.clear.cgColor
+        
         let containerView = NSVisualEffectView(frame: NSRect(x: 0, y: 0, width: w, height: h))
         containerView.material = .hudWindow
         containerView.blendingMode = .behindWindow
@@ -103,6 +110,8 @@ class CustomHUDManager {
         containerView.wantsLayer = true
         containerView.layer?.cornerRadius = h / 2
         containerView.layer?.masksToBounds = true
+        
+        rootView.addSubview(containerView)
 
         let iconSize: CGFloat = 26
         let iconView = NSImageView(frame: NSRect(x: 18, y: (h - iconSize) / 2, width: iconSize, height: iconSize))
@@ -149,7 +158,7 @@ class CustomHUDManager {
         let normalizedValue = CGFloat(min(max(value / maxValue, 0), 1))
         let progressFill = NSView(frame: NSRect(x: barX, y: barY, width: max(barH, barW * normalizedValue), height: barH))
         progressFill.wantsLayer = true
-        progressFill.layer?.backgroundColor = NSColor.white.cgColor
+        progressFill.layer?.backgroundColor = NSColor.white.withAlphaComponent(0.9).cgColor
         progressFill.layer?.cornerRadius = barH / 2
         containerView.addSubview(progressFill)
 
@@ -161,7 +170,7 @@ class CustomHUDManager {
         label.alignment = .right
         containerView.addSubview(label)
 
-        return containerView
+        return rootView
     }
     
     private var fadeTimers: [CGDirectDisplayID: Timer] = [:]
@@ -229,9 +238,9 @@ enum HUDType {
     
     var iconNSColor: NSColor {
         switch self {
-        case .brightness: return .systemYellow
-        case .volume, .volumeMuted: return .systemBlue
-        case .contrast: return .systemGray
+        case .brightness: return .white.withAlphaComponent(0.9)
+        case .volume, .volumeMuted: return .white.withAlphaComponent(0.9)
+        case .contrast: return .white.withAlphaComponent(0.8)
         }
     }
 }

MonitorControl/Support/SliderHandler.swift

@@ -29,7 +29,7 @@ class SliderHandler {
     let offsetY: CGFloat = -1.5
 
     let tickMarkKnobExtraInset: CGFloat = 4
-    let tickMarkKnobExtraRadiusMultiplier: CGFloat = 0.25
+    let tickMarkKnobExtraRadiusMultiplier: CGFloat = 0.75
 
     var numOfTickmarks: Int = 0
     var isHighlightDisplayItems: Bool = false
@@ -226,7 +226,7 @@ class SliderHandler {
     if #available(macOS 12.0, *) {
       let paletteColor: NSColor
       switch command {
-      case .brightness: paletteColor = .systemYellow
+      case .brightness: paletteColor = .labelColor.withAlphaComponent(0.85)
       default: paletteColor = .labelColor.withAlphaComponent(0.72)
       }
       let palette = NSImage.SymbolConfiguration(paletteColors: [paletteColor])
@@ -247,13 +247,23 @@ class SliderHandler {
     }
     self.slider = slider
     if !DEBUG_MACOS10, #available(macOS 11.0, *) {
-      slider.frame.size.width = 196
+      let iconSize: CGFloat = 18
+      let iconPadding: CGFloat = 10
+      slider.frame.size.width = 180
       var sliderFrame = slider.frame
       sliderFrame.size.height = max(sliderFrame.size.height, 22)
       slider.frame = sliderFrame
-      slider.frame.origin = NSPoint(x: 15, y: 8)
-      let view = NSView(frame: NSRect(x: 0, y: 0, width: slider.frame.width + 30 + (showPercent ? 38 : 0), height: slider.frame.height + 42))
+      
+      // Horizontal layout: Icon then Slider
+      let iconX: CGFloat = 15
+      let sliderX = iconX + iconSize + iconPadding
+      slider.frame.origin = NSPoint(x: sliderX, y: 8)
+      
+      let viewWidth = sliderX + slider.frame.width + 15 + (showPercent ? 38 : 0)
+      let viewHeight = slider.frame.height + 16
+      let view = NSView(frame: NSRect(x: 0, y: 0, width: viewWidth, height: viewHeight))
       view.frame.origin = NSPoint(x: 12, y: 0)
+      
       var iconName = "circle.dashed"
       switch command {
       case .audioSpeakerVolume: iconName = "speaker.wave.2.fill"
@@ -262,23 +272,23 @@ class SliderHandler {
       default: break
       }
       let icon = SliderHandler.ClickThroughImageView()
-      let iconSize: CGFloat = 18
       icon.image = SliderHandler.menuSymbolImage(named: iconName, pointSize: iconSize, command: command)
       icon.imageScaling = .scaleProportionallyDown
       if #available(macOS 12.0, *) {
         icon.contentTintColor = nil
       } else {
-        icon.contentTintColor = command == .brightness ? NSColor.systemYellow : NSColor.labelColor.withAlphaComponent(0.72)
+        icon.contentTintColor = .labelColor.withAlphaComponent(0.72)
       }
-      // Position icon at horizontal left (start), 8px above slider
-      icon.frame = NSRect(x: slider.frame.origin.x, y: slider.frame.origin.y + slider.frame.height + 8, width: iconSize, height: iconSize)
+      
+      // Position icon to the left of the slider, vertically centered
+      icon.frame = NSRect(x: iconX, y: slider.frame.origin.y + (slider.frame.height - iconSize) / 2, width: iconSize, height: iconSize)
       icon.imageAlignment = .alignCenter
       icon.configureForMenuSymbol()
       view.addSubview(slider)
       view.addSubview(icon)
       self.icon = icon
       if showPercent {
-        let percentageBox = NSTextField(frame: NSRect(x: 15 + slider.frame.size.width - 2, y: slider.frame.origin.y + (slider.frame.height - 12) / 2, width: 40, height: 12))
+        let percentageBox = NSTextField(frame: NSRect(x: sliderX + slider.frame.size.width + 2, y: slider.frame.origin.y + (slider.frame.height - 12) / 2, width: 40, height: 12))
         self.setupPercentageBox(percentageBox)
         self.percentageBox = percentageBox
         view.addSubview(percentageBox)