Added doc comments for ScrollViewer.

src/Perspex.Controls/ScrollViewer.cs

@@ -8,50 +8,127 @@ using Perspex.Controls.Primitives;
 
 namespace Perspex.Controls
 {
+    /// <summary>
+    /// A control scrolls its content if the content is bigger than the space available.
+    /// </summary>
     public class ScrollViewer : ContentControl
     {
+        /// <summary>
+        /// Defines the <see cref="CanScrollHorizontally"/> property.
+        /// </summary>
+        public static readonly PerspexProperty<bool> CanScrollHorizontallyProperty =
+            PerspexProperty.RegisterAttached<ScrollViewer, Control, bool>(nameof(CanScrollHorizontally), true);
+
+        /// <summary>
+        /// Defines the <see cref="Extent"/> property.
+        /// </summary>
         public static readonly PerspexProperty<Size> ExtentProperty =
-            PerspexProperty.Register<ScrollViewer, Size>("Extent");
+            PerspexProperty.Register<ScrollViewer, Size>(nameof(Extent));
 
+        /// <summary>
+        /// Defines the <see cref="Offset"/> property.
+        /// </summary>
         public static readonly PerspexProperty<Vector> OffsetProperty =
-            PerspexProperty.Register<ScrollViewer, Vector>("Offset", validate: ValidateOffset);
+            PerspexProperty.Register<ScrollViewer, Vector>(nameof(Offset), validate: ValidateOffset);
 
+        /// <summary>
+        /// Defines the <see cref="Viewport"/> property.
+        /// </summary>
         public static readonly PerspexProperty<Size> ViewportProperty =
-            PerspexProperty.Register<ScrollViewer, Size>("Viewport");
-
+            PerspexProperty.Register<ScrollViewer, Size>(nameof(Viewport));
+
+        /// <summary>
+        /// Defines the HorizontalScrollBarMaximum property.
+        /// </summary>
+        /// <remarks>
+        /// There is no C# accessor for this property as it is intended to be bound to by a 
+        /// <see cref="ScrollContentPresenter"/> in the control's template.
+        /// </remarks>
         public static readonly PerspexProperty<double> HorizontalScrollBarMaximumProperty =
             PerspexProperty.Register<ScrollViewer, double>("HorizontalScrollBarMaximum");
 
+        /// <summary>
+        /// Defines the HorizontalScrollBarValue property.
+        /// </summary>
+        /// <remarks>
+        /// There is no C# accessor for this property as it is intended to be bound to by a 
+        /// <see cref="ScrollContentPresenter"/> in the control's template.
+        /// </remarks>
         public static readonly PerspexProperty<double> HorizontalScrollBarValueProperty =
             PerspexProperty.Register<ScrollViewer, double>("HorizontalScrollBarValue");
 
+        /// <summary>
+        /// Defines the HorizontalScrollBarViewportSize property.
+        /// </summary>
+        /// <remarks>
+        /// There is no C# accessor for this property as it is intended to be bound to by a 
+        /// <see cref="ScrollContentPresenter"/> in the control's template.
+        /// </remarks>
         public static readonly PerspexProperty<double> HorizontalScrollBarViewportSizeProperty =
             PerspexProperty.Register<ScrollViewer, double>("HorizontalScrollBarViewportSize");
 
+        /// <summary>
+        /// Defines the <see cref="HorizontalScrollBarVisibility"/> property.
+        /// </summary>
+        /// <remarks>
+        /// There is no C# accessor for this property as it is intended to be bound to by a 
+        /// <see cref="ScrollContentPresenter"/> in the control's template.
+        /// </remarks>
+        public static readonly PerspexProperty<ScrollBarVisibility> HorizontalScrollBarVisibilityProperty =
+            PerspexProperty.RegisterAttached<ScrollBar, Control, ScrollBarVisibility>(
+                nameof(HorizontalScrollBarVisibility),
+                ScrollBarVisibility.Auto);
+
+        /// <summary>
+        /// Defines the VerticalScrollBarMaximum property.
+        /// </summary>
+        /// <remarks>
+        /// There is no C# accessor for this property as it is intended to be bound to by a 
+        /// <see cref="ScrollContentPresenter"/> in the control's template.
+        /// </remarks>
         public static readonly PerspexProperty<double> VerticalScrollBarMaximumProperty =
             PerspexProperty.Register<ScrollViewer, double>("VerticalScrollBarMaximum");
 
+        /// <summary>
+        /// Defines the VerticalScrollBarValue property.
+        /// </summary>
+        /// <remarks>
+        /// There is no C# accessor for this property as it is intended to be bound to by a 
+        /// <see cref="ScrollContentPresenter"/> in the control's template.
+        /// </remarks>
         public static readonly PerspexProperty<double> VerticalScrollBarValueProperty =
             PerspexProperty.Register<ScrollViewer, double>("VerticalScrollBarValue");
 
+        /// <summary>
+        /// Defines the VerticalScrollBarViewportSize property.
+        /// </summary>
+        /// <remarks>
+        /// There is no C# accessor for this property as it is intended to be bound to by a 
+        /// <see cref="ScrollContentPresenter"/> in the control's template.
+        /// </remarks>
         public static readonly PerspexProperty<double> VerticalScrollBarViewportSizeProperty =
             PerspexProperty.Register<ScrollViewer, double>("VerticalScrollBarViewportSize");
 
-        public static readonly PerspexProperty<bool> CanScrollHorizontallyProperty =
-            PerspexProperty.RegisterAttached<ScrollViewer, Control, bool>("CanScrollHorizontally", true);
-
-        public static readonly PerspexProperty<ScrollBarVisibility> HorizontalScrollBarVisibilityProperty =
-            PerspexProperty.RegisterAttached<ScrollBar, Control, ScrollBarVisibility>("HorizontalScrollBarVisibility", ScrollBarVisibility.Auto);
-
+        /// <summary>
+        /// Defines the <see cref="VerticalScrollBarVisibility"/> property.
+        /// </summary>
         public static readonly PerspexProperty<ScrollBarVisibility> VerticalScrollBarVisibilityProperty =
-            PerspexProperty.RegisterAttached<ScrollViewer, Control, ScrollBarVisibility>("VerticalScrollBarVisibility", ScrollBarVisibility.Auto);
+            PerspexProperty.RegisterAttached<ScrollViewer, Control, ScrollBarVisibility>(
+                nameof(VerticalScrollBarVisibility), 
+                ScrollBarVisibility.Auto);
 
+        /// <summary>
+        /// Initializes static members of the <see cref="ScrollViewer"/> class.
+        /// </summary>
         static ScrollViewer()
         {
             AffectsValidation(ExtentProperty, OffsetProperty);
             AffectsValidation(ViewportProperty, OffsetProperty);
         }
 
+        /// <summary>
+        /// Initializes a new instance of the <see cref="ScrollViewer"/> class.
+        /// </summary>
         public ScrollViewer()
         {
             var extentAndViewport = Observable.CombineLatest(
@@ -88,36 +165,54 @@ namespace Perspex.Controls
                 .Subscribe(x => Offset = x);
         }
 
+        /// <summary>
+        /// Gets the extent of the scrollable content.
+        /// </summary>
         public Size Extent
         {
             get { return GetValue(ExtentProperty); }
             private set { SetValue(ExtentProperty, value); }
         }
 
+        /// <summary>
+        /// Gets or sets the current scroll offset.
+        /// </summary>
         public Vector Offset
         {
             get { return GetValue(OffsetProperty); }
             set { SetValue(OffsetProperty, value); }
         }
 
+        /// <summary>
+        /// Gets the size of the viewport on the scrollable content.
+        /// </summary>
         public Size Viewport
         {
             get { return GetValue(ViewportProperty); }
             private set { SetValue(ViewportProperty, value); }
         }
 
+        /// <summary>
+        /// Gets a value indicating whether the content can be scrolled horizontally.
+        /// </summary>
         public bool CanScrollHorizontally
         {
             get { return GetValue(CanScrollHorizontallyProperty); }
             set { SetValue(CanScrollHorizontallyProperty, value); }
         }
 
+        /// <summary>
+        /// Gets or sets the horizontal scrollbar visibility.
+        /// </summary>
         public ScrollBarVisibility HorizontalScrollBarVisibility
         {
             get { return GetValue(HorizontalScrollBarVisibilityProperty); }
             set { SetValue(HorizontalScrollBarVisibilityProperty, value); }
         }
 
+        /// <summary>
+        /// Gets or sets the vertical scrollbar visibility.
+        /// </summary>
         public ScrollBarVisibility VerticalScrollBarVisibility
         {
             get { return GetValue(VerticalScrollBarVisibilityProperty); }
@@ -131,6 +226,7 @@ namespace Perspex.Controls
             return new Vector(Clamp(offset.X, 0, maxX), Clamp(offset.Y, 0, maxY));
         }
 
+        /// <inheritdoc/>
         protected override Size MeasureOverride(Size availableSize)
         {
             return base.MeasureOverride(availableSize);