If another instance is launched, show first instance

Side effect of implementing this is that I had to fix starting it tray so that the window gets properly initialized. This is to prepare for an option to not show tray icon.
PhantomGamers · Jun 13, 2019 · 17a769e · 17a769e
1 parent ef7d201
commit 17a769e
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Showing 3 changed files with 70 additions and 10 deletions.
diff --git a/App.xaml.cs b/App.xaml.cs
@@ -19,6 +19,8 @@ public partial class App : Application
 
         public static bool UpdateTimerActive { get; private set; } = false;
 
+        private static bool firstShown { get; set; } = false;
+
         private static readonly Mutex singleInstance = new Mutex(true, Assembly.GetExecutingAssembly().GetName().Name);
 
         protected override void OnStartup(StartupEventArgs e)
@@ -38,18 +40,36 @@ protected override void OnStartup(StartupEventArgs e)
                     MainWindowRef.Height = SteamFriendsPatcher.Properties.Settings.Default.windowHeight;
                 }
 
+                MainWindowRef.WindowState = WindowState.Minimized;
+                MainWindowRef.Show();
+
                 if (SteamFriendsPatcher.Properties.Settings.Default.minimizeToTray && SteamFriendsPatcher.Properties.Settings.Default.startMinimized)
-                    return;
+                {
+                    MainWindowRef.Hide();
+                }
 
-                MainWindowRef.Show();
+                if (!SteamFriendsPatcher.Properties.Settings.Default.minimizeToTray && SteamFriendsPatcher.Properties.Settings.Default.startMinimized)
+                {
+                    var workingArea = SystemParameters.WorkArea;
+                    MainWindowRef.Left = (workingArea.Width - SteamFriendsPatcher.Properties.Settings.Default.windowWidth) / 2 + workingArea.Left;
+                    MainWindowRef.Top = (workingArea.Height - SteamFriendsPatcher.Properties.Settings.Default.windowHeight) / 2 + workingArea.Top;
+                    firstShown = true;
+                }
 
-                if (SteamFriendsPatcher.Properties.Settings.Default.startMinimized)
-                    MainWindowRef.WindowState = WindowState.Minimized;
+                if (!SteamFriendsPatcher.Properties.Settings.Default.startMinimized)
+                {
+                    MainWindowRef.WindowState = WindowState.Normal;
+                }
 
                 singleInstance.ReleaseMutex();
             }
             else
             {
+                NativeMethods.PostMessage(
+                    (IntPtr)NativeMethods.HWND_BROADCAST,
+                    NativeMethods.WM_SHOWME,
+                    IntPtr.Zero,
+                    IntPtr.Zero);
                 Current.Shutdown(1);
             }
         }
@@ -78,6 +98,24 @@ private static void Setup()
             }
         }
 
+        public static void ShowMain()
+        {
+            if (!firstShown)
+            {
+                var workingArea = SystemParameters.WorkArea;
+                MainWindowRef.Left = (workingArea.Width - SteamFriendsPatcher.Properties.Settings.Default.windowWidth) / 2 + workingArea.Left;
+                MainWindowRef.Top = (workingArea.Height - SteamFriendsPatcher.Properties.Settings.Default.windowHeight) / 2 + workingArea.Top;
+                firstShown = true;
+            }
+
+            if (!MainWindowRef.IsVisible)
+                MainWindowRef.Show();
+
+            if (MainWindowRef.WindowState == WindowState.Minimized)
+                MainWindowRef.WindowState = WindowState.Normal;
+            MainWindowRef.Activate();
+        }
+
         public static void ToggleUpdateTimer(bool status = true)
         {
             if (!UpdateTimerActive && !status)

diff --git a/MainWindow.xaml.cs b/MainWindow.xaml.cs
@@ -3,6 +3,7 @@
 using System.Threading.Tasks;
 using System.Windows;
 using System.Windows.Controls;
+using System.Windows.Interop;
 
 namespace SteamFriendsPatcher
 {
@@ -18,10 +19,27 @@ public MainWindow()
             Closing += MainWindow_Closing;
             SizeChanged += MainWindow_SizeChanged;
             StateChanged += MainWindow_StateChanged;
+            SourceInitialized += MainWindow_SourceInitialized;
             InitializeComponent();
             SetupTrayIcon();
         }
 
+        private void MainWindow_SourceInitialized(object sender, EventArgs e)
+        {
+            HwndSource source = HwndSource.FromHwnd(new WindowInteropHelper(this).Handle);
+            source.AddHook(new HwndSourceHook(WndProc));
+        }
+
+        private static IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
+        {
+            if (msg == NativeMethods.WM_SHOWME)
+            {
+                App.ShowMain();
+            }
+
+            return IntPtr.Zero;
+        }
+
         private void MainWindow_Closing(object sender, System.ComponentModel.CancelEventArgs e)
         {
             NotifyIcon.Visible = false;
@@ -103,12 +121,7 @@ private void SetupTrayIcon()
 
         private void ShowButton_Click(object sender, EventArgs e)
         {
-            if (!IsVisible)
-                Show();
-
-            if (WindowState == WindowState.Minimized)
-                WindowState = WindowState.Normal;
-            Activate();
+            App.ShowMain();
         }
 
         private static void ExitButton_Click(object sender, EventArgs e)

diff --git a/NativeMethods.cs b/NativeMethods.cs
@@ -10,5 +10,14 @@ internal class NativeMethods
 
         [DllImport("user32.dll", EntryPoint = "FindWindow", SetLastError = true)]
         public static extern IntPtr FindWindowByClass(string lpClassName, IntPtr ZeroOnly = default);
+
+        public const int HWND_BROADCAST = 0xffff;
+        public static readonly int WM_SHOWME = RegisterWindowMessage("WM_SHOWME");
+
+        [DllImport("user32")]
+        public static extern bool PostMessage(IntPtr hwnd, int msg, IntPtr wparam, IntPtr lparam);
+
+        [DllImport("user32")]
+        public static extern int RegisterWindowMessage(string message);
     }
 }