Fixed Issue 86.

GUI/MainForm.cs

@@ -121,7 +121,7 @@ namespace OpenHardwareMonitor.GUI {
 
       this.computer = new Computer(settings);
 
-      systemTray = new SystemTray(computer, settings);
+      systemTray = new SystemTray(computer, settings, unitManager);
       systemTray.HideShowCommand += hideShowClick;
       systemTray.ExitCommand += exitClick;
 

GUI/SensorGadget.cs

@@ -581,7 +581,7 @@ namespace OpenHardwareMonitor.GUI {
               if (sensor.SensorType == SensorType.Temperature &&
                 unitManager.TemperatureUnit == TemperatureUnit.Fahrenheit) {
                 formatted = string.Format("{0:F1} °F",
-                  sensor.Value * 1.8 + 32);
+                  UnitManager.CelsiusToFahrenheit(sensor.Value));
               } else {
                 formatted = string.Format(format, sensor.Value);
               }

GUI/SensorNotifyIcon.cs

@@ -21,6 +21,8 @@ using OpenHardwareMonitor.Utilities;
 namespace OpenHardwareMonitor.GUI {
   public class SensorNotifyIcon : IDisposable {
 
+    private UnitManager unitManager;
+
     private ISensor sensor;
     private NotifyIcon notifyIcon;
     private Bitmap bitmap;
@@ -31,10 +33,12 @@ namespace OpenHardwareMonitor.GUI {
     private Brush darkBrush;
     private Pen pen;
     private Font font;
+    private Font smallFont;
 
     public SensorNotifyIcon(SystemTray sensorSystemTray, ISensor sensor,
-      bool balloonTip, PersistentSettings settings) 
+      bool balloonTip, PersistentSettings settings, UnitManager unitManager) 
     {
+      this.unitManager = unitManager;
       this.sensor = sensor;
       this.notifyIcon = new NotifyIcon();
 
@@ -50,6 +54,7 @@ namespace OpenHardwareMonitor.GUI {
       
       this.pen = new Pen(Color.FromArgb(96, Color.Black));
       this.font = SystemFonts.MessageBoxFont;
+      this.smallFont = new Font(font.FontFamily, font.Size * 0.8f);
 
       ContextMenu contextMenu = new ContextMenu();
       MenuItem hideShowItem = new MenuItem("Hide/Show");
@@ -145,7 +150,8 @@ namespace OpenHardwareMonitor.GUI {
         darkBrush.Dispose();
       pen.Dispose();
       graphics.Dispose();      
-      bitmap.Dispose();      
+      bitmap.Dispose();
+      smallFont.Dispose();
     }
 
     private string GetString() {
@@ -159,8 +165,12 @@ namespace OpenHardwareMonitor.GUI {
           return string.Format("{0:F1}", 1e-3f * sensor.Value);
         case SensorType.Load: 
           return string.Format("{0:F0}", sensor.Value);
-        case SensorType.Temperature: 
+        case SensorType.Temperature:
-          return string.Format("{0:F0}", sensor.Value);
+          if (unitManager.TemperatureUnit == TemperatureUnit.Fahrenheit)
+            return string.Format("{0:F0}", 
+              UnitManager.CelsiusToFahrenheit(sensor.Value));
+          else 
+            return string.Format("{0:F0}", sensor.Value);
         case SensorType.Fan: 
           return string.Format("{0:F1}", 1e-3f * sensor.Value);
         case SensorType.Flow:
@@ -180,10 +190,16 @@ namespace OpenHardwareMonitor.GUI {
     }
 
     private Icon CreateTransparentIcon() {
+      string text = GetString();
+      int count = 0;
+      for (int i = 0; i < text.Length; i++)
+        if ((text[i] >= '0' && text[i] <= '9') || text[i] == '-')
+          count++;
+      bool small = count > 2;
 
       graphics.Clear(Color.Black);
-      TextRenderer.DrawText(graphics, GetString(), font,
+      TextRenderer.DrawText(graphics, text, small ? smallFont : font,
-        new Point(-2, 0), Color.White, Color.Black);        
+        new Point(-2, small ? 1 : 0), Color.White, Color.Black);        
 
       BitmapData data = bitmap.LockBits(
         new Rectangle(0, 0, bitmap.Width, bitmap.Height),
@@ -267,6 +283,15 @@ namespace OpenHardwareMonitor.GUI {
         case SensorType.Factor: format = "\n{0}: {1:F3} GB"; break;
       }
       string formattedValue = string.Format(format, sensor.Name, sensor.Value);
+
+      if (sensor.SensorType == SensorType.Temperature &&
+        unitManager.TemperatureUnit == TemperatureUnit.Fahrenheit) 
+      {
+        format = "\n{0}: {1:F1} °F";
+        formattedValue = string.Format(format, sensor.Name,
+          UnitManager.CelsiusToFahrenheit(sensor.Value));
+      }
+
       string hardwareName = sensor.Hardware.Name;
       hardwareName = hardwareName.Substring(0, 
         Math.Min(63 - formattedValue.Length, hardwareName.Length));

GUI/SystemTray.cs

@@ -4,7 +4,7 @@
   License, v. 2.0. If a copy of the MPL was not distributed with this
   file, You can obtain one at http://mozilla.org/MPL/2.0/.
  
-  Copyright (C) 2009-2011 Michael Möller <mmoeller@openhardwaremonitor.org>
+  Copyright (C) 2009-2012 Michael Möller <mmoeller@openhardwaremonitor.org>
 	
 */
 
@@ -20,13 +20,17 @@ namespace OpenHardwareMonitor.GUI {
   public class SystemTray : IDisposable {
     private IComputer computer;
     private PersistentSettings settings;
+    private UnitManager unitManager;
     private List<SensorNotifyIcon> list = new List<SensorNotifyIcon>();
     private bool mainIconEnabled = false;
     private NotifyIcon mainIcon;
 
-    public SystemTray(IComputer computer, PersistentSettings settings) {
+    public SystemTray(IComputer computer, PersistentSettings settings,
+      UnitManager unitManager) 
+    {
       this.computer = computer;
       this.settings = settings;
+      this.unitManager = unitManager;
       computer.HardwareAdded += new HardwareEventHandler(HardwareAdded);
       computer.HardwareRemoved += new HardwareEventHandler(HardwareRemoved);
 
@@ -103,7 +107,7 @@ namespace OpenHardwareMonitor.GUI {
       if (Contains(sensor)) {
         return;
       } else {        
-        list.Add(new SensorNotifyIcon(this, sensor, balloonTip, settings));
+        list.Add(new SensorNotifyIcon(this, sensor, balloonTip, settings, unitManager));
         UpdateMainIconVisibilty();
         settings.SetValue(new Identifier(sensor.Identifier, "tray").ToString(), true);
       }

GUI/UnitManager.cs

@@ -4,7 +4,7 @@
   License, v. 2.0. If a copy of the MPL was not distributed with this
   file, You can obtain one at http://mozilla.org/MPL/2.0/.
  
-  Copyright (C) 2009-2011 Michael Möller <mmoeller@openhardwaremonitor.org>
+  Copyright (C) 2009-2012 Michael Möller <mmoeller@openhardwaremonitor.org>
 	
 */
 
@@ -36,5 +36,9 @@ namespace OpenHardwareMonitor.GUI {
         this.settings.SetValue("TemperatureUnit", (int)temperatureUnit);
       }
     }
+
+    public static float? CelsiusToFahrenheit(float? valueInCelsius) {
+      return valueInCelsius * 1.8f + 32;
+    }
   }
 }