From 5f7bb79e56a57e766ff6e5d2284e1911f7c768bf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gerard=20Gasc=C3=B3n?=
 <52170489+GerardGascon@users.noreply.github.com>
Date: Fri, 7 Jun 2024 00:08:43 +0200
Subject: [PATCH] feat: switching slides

---
 JoyConRead.cs    |  5 +++--
 Program.cs       |  2 ++
 SlideSwitcher.cs | 26 ++++++++++++++++++++++++++
 Win32Api.cs      | 14 ++++++++++++++
 4 files changed, 45 insertions(+), 2 deletions(-)
 create mode 100644 SlideSwitcher.cs
 create mode 100644 Win32Api.cs

diff --git a/JoyConRead.cs b/JoyConRead.cs
index 95ed86d..4eb901b 100644
--- a/JoyConRead.cs
+++ b/JoyConRead.cs
@@ -29,7 +29,6 @@ public class JoyConRead : GamepadReader {
 		await LogDeviceInfo(joycon);
 
 		joycon.ReportReceived += OnJoyConOnReportReceived;
-		Console.WriteLine($"JoyCon ready for presenting.");
 
 		joycon.StoppedOnError += (_, ex) => {
 			Console.WriteLine();
@@ -39,7 +38,9 @@ public class JoyConRead : GamepadReader {
 			return Task.CompletedTask;
 		};
 
-		Console.ReadKey();
+		Console.WriteLine("JoyCon ready for presenting.");
+		Console.WriteLine("Press Enter to exit program.");
+		while (Console.ReadKey().Key != ConsoleKey.Enter) { }
 		joycon.Stop();
 
 		Console.WriteLine();
diff --git a/Program.cs b/Program.cs
index df88ad9..91aef77 100644
--- a/Program.cs
+++ b/Program.cs
@@ -2,7 +2,9 @@
 	class Program {
 		private static async Task Main() {
 			GamepadReader reader = new JoyConRead();
+			SlideSwitcher switcher = new(reader);
 			await reader.Read();
+			switcher.Dispose();
 		}
 	}
 }
\ No newline at end of file
diff --git a/SlideSwitcher.cs b/SlideSwitcher.cs
new file mode 100644
index 0000000..837c292
--- /dev/null
+++ b/SlideSwitcher.cs
@@ -0,0 +1,26 @@
+namespace SwitchSlidePresenter;
+
+public class SlideSwitcher : IDisposable {
+	private readonly GamepadReader _reader;
+
+	public SlideSwitcher(GamepadReader reader) {
+		_reader = reader;
+		_reader.NextSlide += NextSlide;
+		_reader.PrevSlide += PreviousSlide;
+	}
+
+	public void Dispose() {
+		_reader.NextSlide -= NextSlide;
+		_reader.PrevSlide -= PreviousSlide;
+	}
+
+	private void NextSlide() {
+		IntPtr handle = Win32Api.GetForegroundWindow();
+		Win32Api.PostMessage(handle, Win32Api.WM_KEYDOWN, Win32Api.VK_NEXT, 0);
+	}
+
+	private void PreviousSlide() {
+		IntPtr handle = Win32Api.GetForegroundWindow();
+		Win32Api.PostMessage(handle, Win32Api.WM_KEYDOWN, Win32Api.VK_PRIOR, 0);
+	}
+}
\ No newline at end of file
diff --git a/Win32Api.cs b/Win32Api.cs
new file mode 100644
index 0000000..e5f503c
--- /dev/null
+++ b/Win32Api.cs
@@ -0,0 +1,14 @@
+using System.Runtime.InteropServices;
+
+namespace SwitchSlidePresenter;
+
+public static class Win32Api {
+	public const UInt32 WM_KEYDOWN = 0x0100;
+	public const int VK_NEXT = 0x22;
+	public const int VK_PRIOR = 0x21;
+
+	[DllImport("user32.dll")]
+	public static extern bool PostMessage(IntPtr hWnd, UInt32 Msg, int wParam, int lParam);
+	[DllImport("user32.dll")]
+	public static extern IntPtr GetForegroundWindow();
+}
\ No newline at end of file