Added an option to minimize on close.

GUI/MainForm.Designer.cs

@@ -92,6 +92,7 @@ namespace OpenHardwareMonitor.GUI {
       this.optionsMenuItem = new System.Windows.Forms.MenuItem();
       this.startMinMenuItem = new System.Windows.Forms.MenuItem();
       this.minTrayMenuItem = new System.Windows.Forms.MenuItem();
+      this.minCloseMenuItem = new System.Windows.Forms.MenuItem();
       this.startupMenuItem = new System.Windows.Forms.MenuItem();
       this.separatorMenuItem = new System.Windows.Forms.MenuItem();
       this.temperatureUnitsMenuItem = new System.Windows.Forms.MenuItem();
@@ -302,6 +303,7 @@ namespace OpenHardwareMonitor.GUI {
       this.optionsMenuItem.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
             this.startMinMenuItem,
             this.minTrayMenuItem,
+            this.minCloseMenuItem,
             this.startupMenuItem,
             this.separatorMenuItem,
             this.temperatureUnitsMenuItem,
@@ -319,19 +321,24 @@ namespace OpenHardwareMonitor.GUI {
       this.minTrayMenuItem.Index = 1;
       this.minTrayMenuItem.Text = "Minimize To Tray";
       // 
+      // minCloseMenuItem
+      // 
+      this.minCloseMenuItem.Index = 2;
+      this.minCloseMenuItem.Text = "Minimize On Close";
+      // 
       // startupMenuItem
       // 
-      this.startupMenuItem.Index = 2;
+      this.startupMenuItem.Index = 3;
       this.startupMenuItem.Text = "Run On Windows Startup";
       // 
       // separatorMenuItem
       // 
-      this.separatorMenuItem.Index = 3;
+      this.separatorMenuItem.Index = 4;
       this.separatorMenuItem.Text = "-";
       // 
       // temperatureUnitsMenuItem
       // 
-      this.temperatureUnitsMenuItem.Index = 4;
+      this.temperatureUnitsMenuItem.Index = 5;
       this.temperatureUnitsMenuItem.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
             this.celciusMenuItem,
             this.fahrenheitMenuItem});
@@ -351,12 +358,12 @@ namespace OpenHardwareMonitor.GUI {
       // 
       // MenuItem4
       // 
-      this.MenuItem4.Index = 5;
+      this.MenuItem4.Index = 6;
       this.MenuItem4.Text = "-";
       // 
       // hddMenuItem
       // 
-      this.hddMenuItem.Index = 6;
+      this.hddMenuItem.Index = 7;
       this.hddMenuItem.Text = "Read HDD sensors";
       // 
       // helpMenuItem
@@ -513,6 +520,7 @@ namespace OpenHardwareMonitor.GUI {
     private System.Windows.Forms.MenuItem resetMinMaxMenuItem;
     private System.Windows.Forms.MenuItem MenuItem3;
     private System.Windows.Forms.MenuItem gadgetMenuItem;
+    private System.Windows.Forms.MenuItem minCloseMenuItem;
   }
 }
 

GUI/MainForm.cs

@@ -71,6 +71,7 @@ namespace OpenHardwareMonitor.GUI {
     private UserOption showMax;
     private UserOption startMinimized;
     private UserOption minimizeToTray;
+    private UserOption minimizeOnClose;
     private UserOption autoStart;
     private UserOption readHddSensors;
     private UserOption showGadget;
@@ -80,14 +81,14 @@ namespace OpenHardwareMonitor.GUI {
 
       this.settings = new PersistentSettings();      
       this.settings.Load(Path.ChangeExtension(
-        System.Windows.Forms.Application.ExecutablePath, ".config"));
+        Application.ExecutablePath, ".config"));
 
       this.unitManager = new UnitManager(settings);
 
       // set the DockStyle here, to avoid conflicts with the MainMenu
       this.splitContainer.Dock = DockStyle.Fill;
       
-      int p = (int)System.Environment.OSVersion.Platform;
+      int p = (int)Environment.OSVersion.Platform;
       if ((p == 4) || (p == 128)) {
         splitContainer.BorderStyle = BorderStyle.None;
         splitContainer.Border3DStyle = Border3DStyle.Adjust;
@@ -196,6 +197,8 @@ namespace OpenHardwareMonitor.GUI {
         systemTray.IsMainIconEnabled = minimizeToTray.Value;
       };
 
+      minimizeOnClose = new UserOption("minCloseMenuItem", false, minCloseMenuItem, settings);
+
       autoStart = new UserOption(null, startupManager.Startup, startupMenuItem, settings);
       autoStart.Changed += delegate(object sender, EventArgs e) {
         try {
@@ -447,9 +450,25 @@ namespace OpenHardwareMonitor.GUI {
     protected override void WndProc(ref Message m) {
       const int WM_SYSCOMMAND = 0x112;
       const int SC_MINIMIZE = 0xF020;
+      const int SC_CLOSE = 0xF060;
+
       if (minimizeToTray.Value && 
         m.Msg == WM_SYSCOMMAND && m.WParam.ToInt32() == SC_MINIMIZE) {
         SysTrayHideShow();
+      } else if(minimizeOnClose.Value && 
+        m.Msg == WM_SYSCOMMAND && m.WParam.ToInt32() == SC_CLOSE) {
+        /*
+         * Apparently the user wants to minimize rather than close
+         * Now we still need to check if we're going to the tray or not
+         * 
+         * Note: the correct way to do this would be to send out SC_MINIMIZE,
+         * but since the code here is so simple,
+         * that would just be a waste of time.
+         */
+        if (minimizeToTray.Value)
+          SysTrayHideShow();
+        else
+          WindowState = FormWindowState.Minimized;
       } else {      
         base.WndProc(ref m);
       }