Viewport improvements (#3765)

Content.Client/UserInterface/ViewportManager.cs

@@ -0,0 +1,42 @@
+using System.Collections.Generic;
+using Content.Shared;
+using Robust.Shared.Configuration;
+using Robust.Shared.IoC;
+
+namespace Content.Client.UserInterface
+{
+    /// <summary>
+    ///     Event proxy for <see cref="MainViewport"/> to listen to config events.
+    /// </summary>
+    // ReSharper disable once ClassNeverInstantiated.Global
+    public sealed class ViewportManager
+    {
+        [Dependency] private readonly IConfigurationManager _cfg = default!;
+
+        private readonly List<MainViewport> _viewports = new();
+
+        public void Initialize()
+        {
+            _cfg.OnValueChanged(CCVars.ViewportStretch, _ => UpdateCfg());
+            _cfg.OnValueChanged(CCVars.ViewportSnapToleranceClip, _ => UpdateCfg());
+            _cfg.OnValueChanged(CCVars.ViewportSnapToleranceMargin, _ => UpdateCfg());
+            _cfg.OnValueChanged(CCVars.ViewportScaleRender, _ => UpdateCfg());
+            _cfg.OnValueChanged(CCVars.ViewportFixedScaleFactor, _ => UpdateCfg());
+        }
+
+        private void UpdateCfg()
+        {
+            _viewports.ForEach(v => v.UpdateCfg());
+        }
+
+        public void AddViewport(MainViewport vp)
+        {
+            _viewports.Add(vp);
+        }
+
+        public void RemoveViewport(MainViewport vp)
+        {
+            _viewports.Remove(vp);
+        }
+    }
+}