hotkey for mouse capture

hide it when captured on widnows

src/BizHawk.Client.Common/config/Binding.cs

@@ -66,6 +66,7 @@ namespace BizHawk.Client.Common
 			Bind("General", "Toggle Messages");
 			Bind("General", "Toggle Display Nothing");
 			Bind("General", "Accept Background Input");
+			Bind("General", "Capture Mouse");
 
 			Bind("Save States", "Save State 1", "Shift+F1");
 			Bind("Save States", "Save State 2", "Shift+F2");

src/BizHawk.Client.Common/config/Config.cs

@@ -170,6 +170,7 @@ namespace BizHawk.Client.Common
 		public string UpdateLatestVersion { get; set; } = "";
 		public string UpdateIgnoreVersion { get; set; } = "";
 		public bool SkipOutdatedOsCheck { get; set; }
+		public bool CaptureMouse { get; set; } = false;
 
 		public bool SkipSuperuserPrivsCheck { get; set; }
 

src/BizHawk.Client.EmuHawk/MainForm.Hotkey.cs

@@ -149,6 +149,9 @@ namespace BizHawk.Client.EmuHawk
 				case "Accept Background Input":
 					ToggleBackgroundInput();
 					break;
+				case "Capture Mouse":
+					ToggleCaptureMouse();
+					break;
 
 				// Save States
 				case "Save State 1":

src/BizHawk.Client.EmuHawk/MainForm.cs

@@ -856,6 +856,8 @@ namespace BizHawk.Client.EmuHawk
 				return _exitCode;
 			}
 
+			LockMouse(Config.CaptureMouse);
+
 			// incantation required to get the program reliably on top of the console window
 			// we might want it in ToggleFullscreen later, but here, it needs to happen regardless
 			BringToFront();
@@ -2313,7 +2315,7 @@ namespace BizHawk.Client.EmuHawk
 				|| Math.Abs(_lastMouseAutoHidePos.X - mousePos.X) > 5
 				|| Math.Abs(_lastMouseAutoHidePos.Y - mousePos.Y) > 5;
 
-			if (!shouldUpdateCursor)
+			if (!shouldUpdateCursor || Config.CaptureMouse)
 			{
 				return;
 			}
@@ -2803,6 +2805,13 @@ namespace BizHawk.Client.EmuHawk
 			AddOnScreenMessage($"Background Input {(Config.AcceptBackgroundInput ? "enabled" : "disabled")}");
 		}
 
+		private void ToggleCaptureMouse()
+		{
+			Config.CaptureMouse = !Config.CaptureMouse;
+			LockMouse(Config.CaptureMouse);
+			AddOnScreenMessage($"Capture Mouse {(Config.CaptureMouse ? "enabled" : "disabled")}");
+		}
+
 		private void VsyncMessage()
 		{
 			AddOnScreenMessage($"Display Vsync set to {(Config.VSync ? "on" : "off")}");
@@ -4826,10 +4835,16 @@ namespace BizHawk.Client.EmuHawk
 				var fbLocation = Point.Subtract(Bounds.Location, new(PointToClient(Location)));
 				fbLocation.Offset(_presentationPanel.Control.Location);
 				Cursor.Clip = new(fbLocation, _presentationPanel.Control.Size);
+				Cursor.Hide();
+				_presentationPanel.Control.Cursor = Properties.Resources.BlankCursor;
+				_cursorHidden = true;
 			}
 			else
 			{
 				Cursor.Clip = Rectangle.Empty;
+				Cursor.Show();
+				_presentationPanel.Control.Cursor = Cursors.Default;
+				_cursorHidden = false;
 			}
 
 			// Cursor.Clip is a no-op on Linux, so we need this too