Allow minimizing to the tray.

This allows running GIF animations in the background.

smx-config/App.xaml

@@ -1,8 +1,7 @@
 <Application x:Class="smx_config.App"
              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-             xmlns:local="clr-namespace:smx_config"
-             StartupUri="MainWindow.xaml">
+             xmlns:local="clr-namespace:smx_config">
     <Application.Resources>
          
     </Application.Resources>

smx-config/App.xaml.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Windows;
 using System.Runtime.InteropServices;
+using System.IO;
 
 namespace smx_config
 {
@@ -11,9 +12,17 @@ namespace smx_config
         [DllImport("SMX.dll", CallingConvention = CallingConvention.Cdecl)]
         private static extern void SMX_Internal_OpenConsole();
 
+        private System.Windows.Forms.NotifyIcon trayIcon;
+        private MainWindow window;
+
         App()
         {
             AppDomain.CurrentDomain.UnhandledException += UnhandledExceptionEventHandler;
+        }
+
+        protected override void OnStartup(StartupEventArgs e)
+        {
+            base.OnStartup(e);
 
             if(!SMX.SMX.DLLExists())
             {
@@ -38,6 +47,40 @@ namespace smx_config
             // we're running.
             Helpers.LoadSavedPanelAnimations();
             SMX.SMX.LightsAnimation_SetAuto(true);
+
+            CreateTrayIcon();
+
+            // Create the main window.
+            ToggleMainWindow();
+        }
+
+        // Open or close the main window.
+        //
+        // We don't create our UI until the first time it's opened, so we use
+        // less memory when we're launched on startup.  However, when we're minimized
+        // back to the tray, we don't destroy the main window.  WPF is just too
+        // leaky to recreate the main window each time it's called due to internal
+        // circular references.  Instead, we just focus on minimizing CPU overhead.
+        void ToggleMainWindow()
+        {
+            if(window == null)
+            {
+                window = new MainWindow();
+                window.Closed += MainWindowClosed;
+                window.Show();
+            }
+            else if(window.WindowState == WindowState.Minimized)
+            {
+                window.WindowState = WindowState.Normal;
+                window.Activate();
+            }
+            else
+                window.WindowState = WindowState.Minimized;
+        }
+
+        private void MainWindowClosed(object sender, EventArgs e)
+        {
+            window = null;
         }
 
         private void UnhandledExceptionEventHandler(object sender, UnhandledExceptionEventArgs e)
@@ -50,13 +93,69 @@ namespace smx_config
         {
             base.OnExit(e);
 
-            // Shut down cleanly, to make sure we don't run any threaded callbacks during shutdown.
             Console.WriteLine("Application exiting");
-            if(CurrentSMXDevice.singleton == null)
-                return;
+
+            // Remove the tray icon.
+            if(trayIcon != null)
+            {
+                trayIcon.Visible = false;
+                trayIcon = null;
+            }
+
+            // Shut down cleanly, to make sure we don't run any threaded callbacks during shutdown.
+            if(CurrentSMXDevice.singleton != null)
+            {
                 CurrentSMXDevice.singleton.Shutdown();
                 CurrentSMXDevice.singleton = null;
             }
+        }
+
+        // Create a tray icon.  For some reason there's no WPF interface for this,
+        // so we have to use Forms.
+        void CreateTrayIcon()
+        {
+            Stream iconStream = GetResourceStream(new Uri( "pack://application:,,,/Resources/window%20icon%20grey.ico")).Stream;
+            System.Drawing.Icon icon = new System.Drawing.Icon(iconStream);
+
+            trayIcon = new System.Windows.Forms.NotifyIcon();
+            trayIcon.Text = "StepManiaX";
+            trayIcon.Visible = true;
+
+            // Show or hide the application window on click.
+            trayIcon.Click += delegate (object sender, EventArgs e) { ToggleMainWindow();  };
+            trayIcon.DoubleClick += delegate (object sender, EventArgs e) { ToggleMainWindow();  };
+
+            CurrentSMXDevice.singleton.ConfigurationChanged += delegate(LoadFromConfigDelegateArgs args) {
+                RefreshTrayIcon(args);
+            };
+
+            // Do the initial refresh.
+            RefreshTrayIcon(CurrentSMXDevice.singleton.GetState(), true);
+        }
+
+        // Refresh the tray icon when we're connected or disconnected.
+        bool wasConnected;
+        void RefreshTrayIcon(LoadFromConfigDelegateArgs args, bool force=false)
+        {
+            if(trayIcon == null)
+                return;
 
+            bool EitherControllerConnected = false;
+            for(int pad = 0; pad < 2; ++pad)
+                if(args.controller[pad].info.connected)
+                    EitherControllerConnected = true;
+
+            // Skip the refresh if the connected state didn't change.
+            if(wasConnected == EitherControllerConnected && !force)
+                return;
+            wasConnected = EitherControllerConnected;
+
+            trayIcon.Text = EitherControllerConnected? "StepManiaX (connected)":"StepManiaX (disconnected)";
+
+            // Set the tray icon.
+            string filename = EitherControllerConnected? "window%20icon.ico":"window%20icon%20grey.ico";
+            Stream iconStream = GetResourceStream(new Uri( "pack://application:,,,/Resources/" + filename)).Stream;
+            trayIcon.Icon = new System.Drawing.Icon(iconStream);
+        }
     }
 }

smx-config/MainWindow.xaml.cs

@@ -18,6 +18,51 @@ namespace smx_config
             onConfigChange = new OnConfigChange(this, delegate(LoadFromConfigDelegateArgs args) {
                 LoadUIFromConfig(args);
             });
+
+            // If we're controlling GIF animations, confirm exiting, since you can minimize
+            // to tray to keep playing animations.  If we're not controlling animations,
+            // don't bug the user with a prompt.
+            Closing += delegate(object sender, System.ComponentModel.CancelEventArgs e)
+            {
+                LoadFromConfigDelegateArgs args = CurrentSMXDevice.singleton.GetState();
+
+                // Don't use ActivePads here.  Even if P1 is selected for configuration,
+                // we can still be controlling animations for P2, so check both connected
+                // pads.
+                bool shouldConfirmExit = false;
+                for(int pad = 0; pad < 2; ++pad)
+                {
+                    SMX.SMXConfig config;
+                    if(!SMX.SMX.GetConfig(pad, out config))
+                        continue;
+
+                    // If AutoLightingUsePressedAnimations isn't set, the panel is using step
+                    // coloring instead of pressed animations.  All firmwares support this.
+                    // Don't confirm exiting for this mode.
+                    if((config.configFlags & SMX.SMXConfigFlags.SMXConfigFlags_AutoLightingUsePressedAnimations) == 0)
+                        continue;
+
+                    shouldConfirmExit = true;
+                }
+
+                if(!shouldConfirmExit)
+                    return;
+
+                MessageBoxResult result = MessageBox.Show(
+                    "Close StepManiaX configuration?\n\n" +
+                    "GIF animations will keep playing if the application is minimized.",
+                    "StepManiaX", System.Windows.MessageBoxButton.YesNo);
+                if(result == MessageBoxResult.No)
+                    e.Cancel = true;
+            };
+
+            StateChanged += delegate(object sender, EventArgs e)
+            {
+                // Closing the main window entirely when minimized to the tray would be
+                // nice, but with WPF we don't really save memory by doing that, so
+                // just hide the window.
+                ShowInTaskbar = WindowState != WindowState.Minimized;
+            };
         }
 
         public override void OnApplyTemplate()

smx-config/SMXConfig.csproj

@@ -81,6 +81,7 @@
     <Reference Include="System" />
     <Reference Include="System.Data" />
     <Reference Include="System.Drawing" />
+    <Reference Include="System.Windows.Forms" />
     <Reference Include="System.Xml" />
     <Reference Include="Microsoft.CSharp" />
     <Reference Include="System.Core" />
@@ -195,6 +196,12 @@
     <Resource Include="Resources\pressed.gif" />
     <Resource Include="Resources\released.gif" />
   </ItemGroup>
+  <ItemGroup>
+    <Resource Include="Resources\window icon grey.ico" />
+  </ItemGroup>
+  <ItemGroup>
+    <Resource Include="Resources\window icon.ico" />
+  </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.