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//
// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License. See License.txt in the project root for license information.
//
using Microsoft.VisualStudio.Text.Editor;
namespace Microsoft.VisualStudio.Text.Differencing
{
/// <summary>
/// A <see cref="ITextViewModel"/> used by <see cref="IDifferenceViewer"/>.
/// </summary>
internal interface IDifferenceViewerTextViewModel
{
/// <summary>
/// The view type for a view created by an <see cref="IDifferenceViewer"/>.
/// </summary>
DifferenceViewType ViewType { get; }
/// <summary>
/// The currently-used snapshot difference that matches up with the current snapshot
/// of the inline buffer.
/// </summary>
/// <remarks>Will be <c>null</c> before the first snapshot difference is computed.</remarks>
ISnapshotDifference CurrentSnapshotDifference { get; }
/// <summary>
/// Are the left and right views are synchronized in the side by side view.
/// </summary>
/// <remarks>
/// <para>In the side by side view, the left and right views are, normally, synchronized so that so that matching text always shown in each view.
/// If this synchronization is turned off, then each view will scroll independently.</para>
/// </remarks>
bool AreViewsSynchronized { get; }
/// <summary>
/// The view for displaying the left buffer for <see cref="DifferenceViewMode.SideBySide"/> differences.
/// </summary>
/// <remarks>Will never be <c>null</c>, but will only be visible when view mode
/// is set to <see cref="DifferenceViewMode.SideBySide"/>.</remarks>
ITextView LeftView { get; }
/// <summary>
/// The view for displaying the right buffer for <see cref="DifferenceViewMode.SideBySide"/> differences.
/// </summary>
/// <remarks>Will never be <c>null</c>, but will only be visible when view mode
/// is set to <see cref="DifferenceViewMode.SideBySide"/>.</remarks>
ITextView RightView { get; }
}
}
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