Fix #398 keyboard layout change not working

docs/Changelog.md

@@ -1,9 +1,11 @@
 
+- Fix keyboard layout change not working.
+
 5.8.0.0 Beta (2022-04-02)
 
 - Fix crash on Windows 7 systems without PowerShell.
 - Fix showing incorrect timestamps in About dialog of Store version.
-- Fix Store page showing non existant ARM and x86 support.
+- Fix Store page showing non-existent ARM and x86 support.
 - Fix opening zip files.
 - The list of available input commands is like before shown
   by the text editor, so it's like everything else searchable.
@@ -18,7 +20,7 @@
 - Workaround not reproducible logo drawing crash.
 - Info command shows the length.
 - New mpv.net specific option `show-logo` that allows to disable
-  the drawing of the blue mpv.net logo ontop of the native OSC logo.
+  the drawing of the blue mpv.net logo on top of the native OSC logo.
 - MediaInfo 22.03
 
 

src/Misc/CorePlayer.cs

@@ -413,23 +413,8 @@ KP1 script-binding delete_current_file/confirm
                 mpv_event evt = (mpv_event)Marshal.PtrToStructure(ptr, typeof(mpv_event));
 
                 if (WindowHandle == IntPtr.Zero)
-                {
                     WindowHandle = Native.FindWindowEx(MainForm.Hwnd, IntPtr.Zero, "mpv", null);
 
-                    if (WindowHandle != IntPtr.Zero)
-                    {
-                        int GWL_STYLE = -16;
-
-                        uint WS_CHILD        = 0x40000000;
-                        uint WS_CLIPSIBLINGS = 0x04000000;
-                        uint WS_DISABLED     = 0x08000000;
-                        uint WS_VISIBLE      = 0x10000000;
-
-                        Native.SetWindowLong(WindowHandle, GWL_STYLE,
-                            WS_CHILD | WS_VISIBLE | WS_DISABLED | WS_CLIPSIBLINGS);
-                    }
-                }
-
                 try
                 {
                     switch (evt.event_id)

src/Misc/MainForm.cs

@@ -815,6 +815,9 @@ namespace mpvnet
                     if (Core.WindowHandle != IntPtr.Zero)
                         m.Result = SendMessage(Core.WindowHandle, m.Msg, m.WParam, m.LParam);
                     break;
+                case 0x051: // WM_INPUTLANGCHANGE
+                    ActivateKeyboardLayout(m.LParam, 0x00000100u /*KLF_SETFORPROCESS*/);
+                    break;
                 case 0x319: // WM_APPCOMMAND
                     {
                         string value = Input.WM_APPCOMMAND_to_mpv_key((int)(m.LParam.ToInt64() >> 16 & ~0xf000));

src/Native/Native.cs

@@ -18,6 +18,9 @@ namespace mpvnet
         [DllImport("kernel32.dll")]
         public static extern IntPtr LoadLibrary(string path);
 
+        [DllImport("user32.dll")]
+        public static extern uint ActivateKeyboardLayout(IntPtr hkl, uint flags);
+
         [DllImport("user32.dll", CharSet = CharSet.Unicode)]
         public static extern IntPtr FindWindowEx(
             IntPtr parentHandle, IntPtr childAfter, string lclassName, string windowTitle);