1 files changed, 78 insertions, 0 deletions
diff --git a/src/Text/Def/Internal/TextUI/LegacySelection.cs b/src/Text/Def/Internal/TextUI/LegacySelection.cs
new file mode 100644
index 0000000..ee3b9cc
--- /dev/null
+++ b/src/Text/Def/Internal/TextUI/LegacySelection.cs
@@ -0,0 +1,78 @@
+//
+//  Copyright (c) Microsoft Corporation. All rights reserved.
+//  Licensed under the MIT License. See License.txt in the project root for license information.
+//
+// This file contain internal APIs that are subject to change without notice.
+// Use at your own risk.
+//
+namespace Microsoft.VisualStudio.Text.Editor
+{
+    using System;
+
+#pragma warning disable CA1710 // Identifiers should have correct suffix
+    /// <summary>
+    /// Represents the selection on the screen.
+    /// </summary>
+    public abstract class LegacySelection : DisplayTextRange
+#pragma warning restore CA1710 // Identifiers should have correct suffix
+    {
+        /// <summary>
+        /// When implemented in a derived class, selects the given text range.
+        /// </summary>
+        /// <param name="textRange">The range to select.</param>
+        public abstract void SelectRange(TextRange textRange);
+
+        /// <summary>
+        /// When implemented in a derived class, selects the given text range, reversing the selection if needed. Ensures
+        /// that the end point of the selection is visible on screen.
+        /// </summary>
+        /// <param name="selectionStart">The start point for the selection.</param>
+        /// <param name="selectionEnd">The end point for the selection.</param>
+        /// <remarks>If <paramref name="selectionStart"/> is positioned after <paramref name="selectionEnd"/>, then the
+        /// selection is reversed.</remarks>
+        public abstract void SelectRange(TextPoint selectionStart, TextPoint selectionEnd);
+
+        /// <summary>
+        /// When implemented in a derived class, selects all the text in the document. Ensures that the end point
+        /// of the selection is visible on screen.
+        /// </summary>
+        public abstract void SelectAll();
+
+        /// <summary>
+        /// When implemented in a derived class, extends the selection from its current start point to the new end point. Ensures
+        /// that the end point of the selection is visible on screen.
+        /// </summary>
+        /// <param name="newEnd">
+        /// The text point to which to extend the selection.
+        /// </param>
+        /// <remarks>
+        /// <paramref name="newEnd"/> may become the new start point, if <paramref name="newEnd"/> is before the current start point.
+        /// </remarks>
+        /// <exception cref="InvalidOperationException"><paramref name="newEnd"/> belongs to a different buffer.</exception>
+        public abstract void ExtendSelection(TextPoint newEnd);
+
+        /// <summary>
+        /// When implemented in a derived class, resets any selection in the text.
+        /// </summary>
+        public abstract void Clear();
+
+        /// <summary>
+        /// When implemented in a derived class, provides advanced selection manipulation functionality.
+        /// </summary>
+        /// <returns>The <see cref="ITextSelection"/>.</returns>
+        [System.ComponentModel.EditorBrowsable(System.ComponentModel.EditorBrowsableState.Advanced)]
+        public abstract ITextSelection AdvancedSelection
+        {
+            get;
+        }
+
+        /// <summary>
+        /// When implemented in a derived class, determines whether the end point represents the start of the selection.
+        /// </summary>
+        public abstract bool IsReversed
+        {
+            get;
+            set;
+        }
+    }
+}