Add SteamController implementation

This adds a Steam Shortcuts, Desktop Mode, and X360 Emulation
- Supports all Steam Shortcuts (including on-screen keyboard, and brightness)
- Supports Desktop mode (with a scroll on left pad and left stick), and trackpoint (on right stick)
- Supports X360 mode: hold Options for 1s to switch between Desktop and X360
- Holding Steam button enables Desktop like controls and stops passing all inputs to X360

ExternalHelpers/OnScreenKeyboard.cs

@@ -0,0 +1,60 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Diagnostics;
+using System.ComponentModel;
+using System.Runtime.InteropServices;
+using System.Threading;
+
+namespace ExternalHelpers
+{
+    public static class OnScreenKeyboard
+    {
+        public const String TabTipPath = @"C:\Program Files\Common Files\Microsoft Shared\ink\TabTip.exe";
+
+        public static bool Toggle()
+        {
+            StartTabTip();
+
+            var type = Type.GetTypeFromCLSID(Guid.Parse("4ce576fa-83dc-4F88-951c-9d0782b4e376"));
+            if (type is null)
+                return false;
+            var instance = (ITipInvocation?)Activator.CreateInstance(type);
+            if (instance is null)
+                return false;
+            instance?.Toggle(GetDesktopWindow());
+            Marshal.ReleaseComObject(instance);
+            return true;
+        }
+
+        static void StartTabTip()
+        {
+            if (FindWindow("IPTIP_Main_Window", "") != IntPtr.Zero)
+                return;
+
+            Process.Start(TabTipPath);
+
+            for (int i = 0; i < 10 && FindWindow("IPTIP_Main_Window", "") == IntPtr.Zero; i++)
+                Thread.Sleep(100);
+        }
+
+        [ComImport, Guid("4ce576fa-83dc-4F88-951c-9d0782b4e376")]
+        class UIHostNoLaunch
+        {
+        }
+
+        [ComImport, Guid("37c994e7-432b-4834-a2f7-dce1f13b834b")]
+        [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
+        interface ITipInvocation
+        {
+            void Toggle(IntPtr hwnd);
+        }
+
+        [DllImport("user32.dll", SetLastError = false)]
+        static extern IntPtr GetDesktopWindow();
+
+        [DllImport("user32.dll", EntryPoint = "FindWindow")]
+        static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
+    }
+}

ExternalHelpers/SDStructs.cs

@@ -45,7 +45,8 @@ namespace PowerControl.External
         CONFIGURE_BT = 0x18,
     }
 
-    public enum SDCButton0
+    [Flags]
+    public enum SDCButton0 : ushort
     {
         BTN_L5 = 0b1000000000000000,
         BTN_OPTIONS = 0b0100000000000000,
@@ -65,22 +66,25 @@ namespace PowerControl.External
         BTN_R2 = 0b0000000000000001,
     }
 
-    public enum SDCButton1
+    [Flags]
+    public enum SDCButton1 : byte
     {
         BTN_LSTICK_PRESS = 0b01000000,
+        BTN_RPAD_TOUCH = 0b00010000,
         BTN_LPAD_TOUCH = 0b00001000,
+        BTN_RPAD_PRESS = 0b00000100,
         BTN_LPAD_PRESS = 0b00000010,
-        BTN_RPAD_PRESS = 0b00010000,
-        BTN_RPAD_TOUCH = 0b00000100,
         BTN_R5 = 0b00000001,
     }
 
-    public enum SDCButton2
+    [Flags]
+    public enum SDCButton2 : byte
     {
         BTN_RSTICK_PRESS = 0b00000100,
     }
 
-    public enum SDCButton4
+    [Flags]
+    public enum SDCButton4 : byte
     {
         BTN_LSTICK_TOUCH = 0b01000000,
         BTN_RSTICK_TOUCH = 0b10000000,
@@ -88,29 +92,30 @@ namespace PowerControl.External
         BTN_L4 = 0b00000010,
     }
 
-    public enum SDCButton5
+    [Flags]
+    public enum SDCButton5 : byte
     {
         BTN_QUICK_ACCESS = 0b00000100,
     }
 
-
     [StructLayout(LayoutKind.Sequential)]
     public struct SDCInput
     {
         public byte ptype;          //0x00
-        public byte _a1;            //0x01 
-        public byte _a2;            //0x02 
+        public byte _a1;            //0x01
+        public byte _a2;            //0x02
         public byte _a3;            //0x03
-        public uint seq;          //0x04 
-        public ushort buttons0;     //0x09 
-        public byte buttons1;       //0x0A
-        public byte buttons2;       //0x0C
-        public byte buttons3;       //0x0D
-        public byte buttons4;       //0x0E
-        public byte buttons5;       //0x0E
+        public uint seq;            //0x04
+        public SDCButton0 buttons0; //0x08
+        public SDCButton1 buttons1; //0x0A
+        public SDCButton2 buttons2; //0x0B
+        public byte buttons3;       //0x0C
+        public SDCButton4 buttons4; //0x0D
+        public SDCButton5 buttons5; //0x0E
+        public byte buttons6;       //0x0F
         public short lpad_x;        //0x10
         public short lpad_y;        //0x12
-        public short rpad_x;        //0x13
+        public short rpad_x;        //0x14
         public short rpad_y;        //0x16
         public short accel_x;       //0x18
         public short accel_y;       //0x1A
@@ -136,7 +141,7 @@ namespace PowerControl.External
             var handle = GCHandle.Alloc(bytes, GCHandleType.Pinned);
             try
             {
-                return (SDCInput)Marshal.PtrToStructure(handle.AddrOfPinnedObject(), typeof(SDCInput));
+                return Marshal.PtrToStructure<SDCInput>(handle.AddrOfPinnedObject());
             }
             catch
             {

ExternalHelpers/WindowsSettingsBrightnessController.cs

@@ -12,6 +12,14 @@ namespace PowerControl.Helpers
     /// </summary>
     public static class WindowsSettingsBrightnessController
     {
+        public static void Increase(int brightness)
+        {
+            var current = Get();
+            current += brightness;
+            current = Math.Clamp(current, 0, 100);
+            Set(current);
+        }
+
         public static int Get(double roundValue = 10.0)
         {
             return (int)(Math.Round(Get() / roundValue) * roundValue);