1 files changed, 65 insertions, 0 deletions
diff --git a/src/Editor/Text/Util/TextUICocoaUtil/CocoaTextViewZoomManager.cs b/src/Editor/Text/Util/TextUICocoaUtil/CocoaTextViewZoomManager.cs
new file mode 100644
index 0000000..b245487
--- /dev/null
+++ b/src/Editor/Text/Util/TextUICocoaUtil/CocoaTextViewZoomManager.cs
@@ -0,0 +1,65 @@
+
+using System;
+using Microsoft.VisualStudio.Text.Editor;
+using Microsoft.VisualStudio.Utilities;
+
+namespace Microsoft.VisualStudio.Text.Utilities
+{
+    [ExportImplementation(typeof(ITextViewZoomManager))]
+    [Name("Cocoa zoom manager")]
+    [Order(Before = "default")]
+    internal class CocoaTextViewZoomManager : ITextViewZoomManager
+    {
+        public double ZoomLevel(ITextView textView) => ((ICocoaTextView)textView).ZoomLevel;
+
+        public void ZoomIn(ITextView textView)
+        {
+            if (textView is null)
+            {
+                throw new ArgumentNullException(nameof(textView));
+            }
+
+            ICocoaTextView cocoaTextView = textView as ICocoaTextView;
+            if (cocoaTextView != null && cocoaTextView.Roles.Contains(PredefinedTextViewRoles.Zoomable))
+            {
+                double zoomLevel = cocoaTextView.ZoomLevel * ZoomConstants.ScalingFactor;
+                if (zoomLevel < ZoomConstants.MaxZoom || Math.Abs(zoomLevel - ZoomConstants.MaxZoom) < 0.00001)
+                {
+                    cocoaTextView.Options.GlobalOptions.SetOptionValue(DefaultTextViewOptions.ZoomLevelId, zoomLevel);
+                }
+            }
+        }
+
+        public void ZoomOut(ITextView textView)
+        {
+            if (textView is null)
+            {
+                throw new ArgumentNullException(nameof(textView));
+            }
+
+            ICocoaTextView cocoaTextView = textView as ICocoaTextView;
+            if (cocoaTextView != null && cocoaTextView.Roles.Contains(PredefinedTextViewRoles.Zoomable))
+            {
+                double zoomLevel = cocoaTextView.ZoomLevel / ZoomConstants.ScalingFactor;
+                if (zoomLevel > ZoomConstants.MinZoom || Math.Abs(zoomLevel - ZoomConstants.MinZoom) < 0.00001)
+                {
+                    cocoaTextView.Options.GlobalOptions.SetOptionValue(DefaultTextViewOptions.ZoomLevelId, zoomLevel);
+                }
+            }
+        }
+
+        public void ZoomTo(ITextView textView, double zoomLevel)
+        {
+            if (textView is null)
+            {
+                throw new ArgumentNullException(nameof(textView));
+            }
+
+            ICocoaTextView cocoaTextView = textView as ICocoaTextView;
+            if (cocoaTextView != null && cocoaTextView.Roles.Contains(PredefinedTextViewRoles.Zoomable))
+            {
+                cocoaTextView.Options.GlobalOptions.SetOptionValue(DefaultTextViewOptions.ZoomLevelId, zoomLevel);
+            }
+        }
+    }
+}