1 files changed, 46 insertions, 0 deletions
diff --git a/src/Editor/Text/Def/TextUI/Editor/ITextViewZoomManager.cs b/src/Editor/Text/Def/TextUI/Editor/ITextViewZoomManager.cs
new file mode 100644
index 0000000..eb4974b
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+++ b/src/Editor/Text/Def/TextUI/Editor/ITextViewZoomManager.cs
@@ -0,0 +1,46 @@
+//
+//  Copyright (c) Microsoft Corporation. All rights reserved.
+//  Licensed under the MIT License. See License.txt in the project root for license information.
+//
+
+namespace Microsoft.VisualStudio.Text.Editor
+{
+    /// <summary>
+    /// Provides methods to manipulate zoom level of text views.
+    /// </summary>
+    /// <remarks>This is a MEF Component, and should be imported as follows:
+    /// <code>
+    /// [Import]
+    /// ITextViewZoomManager zoomManager = null;
+    /// </code>
+    /// </remarks>
+    internal interface ITextViewZoomManager
+    {
+        /// <summary>
+        /// Zooms in to the text view by a scaling factor of 10%.
+        /// </summary>
+        /// <remarks>
+        /// The maximum zooming scale is 400%.
+        /// </remarks>
+        void ZoomIn(ITextView textView);
+
+        /// <summary>
+        /// Zooms out of the text view by a scaling factor of 10%.
+        /// </summary>
+        /// <remarks>
+        /// The minimum zooming scale is 20%.
+        /// </remarks>
+        void ZoomOut(ITextView textView);
+
+        /// <summary>
+        /// Applies the given zoomLevel to the text view.
+        /// </summary>
+        /// <param name="zoomLevel">The zoom level to apply between 20% to 400%.</param>
+        void ZoomTo(ITextView textView, double zoomLevel);
+
+        /// <summary>
+        /// Gets ZoomLevel between 20% to 400% of text view.
+        /// </summary>
+        double ZoomLevel(ITextView textView);
+    }
+}