Add API for getting current IClydeMonitor (space-wizards#6615)

Author: metalgearsloth

Robust.Client/Graphics/Clyde/Clyde.Windowing.cs

@@ -290,6 +290,19 @@ public void SetWindowMonitor(IClydeMonitor monitor)
             _windowing!.WindowSetMonitor(_mainWindow!, monitor);
         }
 
+        public IClydeMonitor? GetMainWindowMonitor()
+        {
+            return GetWindowMonitor(_mainWindow!.Owner!);
+        }
+
+        public IClydeMonitor? GetWindowMonitor(IClydeWindow window)
+        {
+            DebugTools.AssertNotNull(_windowing);
+
+            var reg = ((WindowHandle)window).Reg;
+            return _windowing!.WindowGetMonitor(reg);
+        }
+
         public void RequestWindowAttention()
         {
             DebugTools.AssertNotNull(_windowing);

Robust.Client/Graphics/Clyde/ClydeHeadless.cs

@@ -116,6 +116,16 @@ public void SetWindowMonitor(IClydeMonitor monitor)
             // Nada.
         }
 
+        public IClydeMonitor? GetWindowMonitor(IClydeWindow window)
+        {
+            return null;
+        }
+
+        public IClydeMonitor? GetMainWindowMonitor()
+        {
+            return null;
+        }
+
         public void RequestWindowAttention()
         {
             // Nada.

Robust.Client/Graphics/Clyde/Windowing/IWindowingImpl.cs

@@ -39,6 +39,7 @@ private interface IWindowingImpl
             void WindowDestroy(WindowReg reg);
             void WindowSetTitle(WindowReg window, string title);
             void WindowSetMonitor(WindowReg window, IClydeMonitor monitor);
+            IClydeMonitor? WindowGetMonitor(WindowReg window);
             void WindowSetSize(WindowReg window, Vector2i size);
             void WindowSetVisible(WindowReg window, bool visible);
             void WindowSetRelativeMouseMode(WindowReg window, bool enabled);

Robust.Client/Graphics/Clyde/Windowing/Sdl3.Window.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Numerics;
 using System.Runtime.CompilerServices;
 using System.Threading.Tasks;
@@ -426,6 +427,13 @@ public void WindowSetMonitor(WindowReg window, IClydeMonitor monitor)
             _sawmill.Warning("WindowSetMonitor not implemented on SDL3");
         }
 
+        public IClydeMonitor? WindowGetMonitor(WindowReg window)
+        {
+            var displayId = SDL.SDL_GetDisplayForWindow(WinPtr(window));
+            var monitorId = GetMonitorIdFromDisplayId(displayId);
+            return _clyde._monitorHandles.GetValueOrDefault(monitorId);
+        }
+
         public void WindowSetSize(WindowReg window, Vector2i size)
         {
             SendCmd(new CmdWinSetSize { Window = WinPtr(window), W = size.X, H = size.Y });

Robust.Client/Graphics/IClyde.cs

@@ -37,6 +37,16 @@ public interface IClyde
         void SetWindowTitle(string title);
         void SetWindowMonitor(IClydeMonitor monitor);
 
+        /// <summary>
+        ///     Gets the monitor the specified window is currently on.
+        /// </summary>
+        IClydeMonitor? GetWindowMonitor(IClydeWindow window);
+
+        /// <summary>
+        ///     Gets the monitor the main game window is currently on.
+        /// </summary>
+        IClydeMonitor? GetMainWindowMonitor();
+
         /// <summary>
         ///     This is the magic method to make the game window ping you in the task bar.
         /// </summary>