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+using System;
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+using Xunit;
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+
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+namespace Terminal.Gui {
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+ public class ScrollBarViewTests {
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+ public class HostView : View {
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+ public int Top { get; set; }
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+ public int Lines { get; set; }
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+ public int Left { get; set; }
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+ public int Cols { get; set; }
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+ }
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+
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+ private HostView _hostView;
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+ private ScrollBarView _vertical;
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+ private ScrollBarView _horizontal;
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+ private bool _added;
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+
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+ public ScrollBarViewTests ()
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+ {
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+ Application.Init (new FakeDriver (), new FakeMainLoop (() => FakeConsole.ReadKey (true)));
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+
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+ var top = Application.Top;
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+
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+ _hostView = new HostView () {
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+ Width = Dim.Fill (),
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+ Height = Dim.Fill (),
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+ Top = 0,
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+ Lines = 30,
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+ Left = 0,
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+ Cols = 100
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+ };
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+
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+ top.Add (_hostView);
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+ }
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+
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+ private void AddHandlers ()
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+ {
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+ if (!_added) {
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+ _hostView.DrawContent += _hostView_DrawContent;
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+ _vertical.ChangedPosition += _vertical_ChangedPosition;
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+ _horizontal.ChangedPosition += _horizontal_ChangedPosition;
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+ }
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+ _added = true;
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+ }
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+
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+ private void RemoveHandlers ()
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+ {
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+ if (_added) {
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+ _hostView.DrawContent -= _hostView_DrawContent;
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+ _vertical.ChangedPosition -= _vertical_ChangedPosition;
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+ _horizontal.ChangedPosition -= _horizontal_ChangedPosition;
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+ }
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+ _added = false;
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+ }
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+
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+ private void _hostView_DrawContent (Rect obj)
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+ {
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+ _vertical.Size = _hostView.Lines;
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+ _vertical.Position = _hostView.Top;
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+ _horizontal.Size = _hostView.Cols;
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+ _horizontal.Position = _hostView.Left;
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+ _vertical.ColorScheme = _horizontal.ColorScheme = _hostView.ColorScheme;
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+ if (_vertical.ShowScrollIndicator) {
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+ _vertical.Redraw (obj);
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+ }
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+ if (_horizontal.ShowScrollIndicator) {
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+ _horizontal.Redraw (obj);
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+ }
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+ }
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+
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+ private void _vertical_ChangedPosition ()
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+ {
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+ _hostView.Top = _vertical.Position;
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+ if (_hostView.Top != _vertical.Position) {
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+ _vertical.Position = _hostView.Top;
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+ }
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+ _hostView.SetNeedsDisplay ();
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+ }
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+
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+ private void _horizontal_ChangedPosition ()
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+ {
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+ _hostView.Left = _horizontal.Position;
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+ if (_hostView.Left != _horizontal.Position) {
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+ _horizontal.Position = _hostView.Left;
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+ }
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+ _hostView.SetNeedsDisplay ();
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+ }
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+
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+ [Fact]
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+ public void Hosting_A_Null_View_To_A_ScrollBarView_Throws_ArgumentNullException ()
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+ {
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+ Assert.Throws<ArgumentNullException> ("The host parameter can't be null.",
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+ () => new ScrollBarView (null, true));
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+ Assert.Throws<ArgumentNullException> ("The host parameter can't be null.",
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+ () => new ScrollBarView (null, false));
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+ }
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+
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+ [Fact]
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+ public void Hosting_A_Null_SuperView_View_To_A_ScrollBarView_Throws_ArgumentNullException ()
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+ {
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+ Assert.Throws<ArgumentNullException> ("The host SuperView parameter can't be null.",
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+ () => new ScrollBarView (new View (), true));
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+ Assert.Throws<ArgumentNullException> ("The host SuperView parameter can't be null.",
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+ () => new ScrollBarView (new View (), false));
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+ }
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+
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+ [Fact]
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+ public void Hosting_A_View_To_A_ScrollBarView ()
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+ {
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+ RemoveHandlers ();
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+
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+ _vertical = new ScrollBarView (_hostView, true);
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+ _horizontal = new ScrollBarView (_hostView, false);
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+ _vertical.OtherScrollBarView = _horizontal;
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+ _horizontal.OtherScrollBarView = _vertical;
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+
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+ Assert.True (_vertical.IsVertical);
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+ Assert.False (_horizontal.IsVertical);
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+
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+ Assert.Equal (_vertical.Position, _hostView.Top);
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+ Assert.NotEqual (_vertical.Size, _hostView.Lines);
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+ Assert.Equal (_horizontal.Position, _hostView.Left);
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+ Assert.NotEqual (_horizontal.Size, _hostView.Cols);
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+
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+ AddHandlers ();
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+ _hostView.SuperView.LayoutSubviews ();
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+ _hostView.Redraw (_hostView.Bounds);
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+
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+ Assert.Equal (_vertical.Position, _hostView.Top);
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+ Assert.Equal (_vertical.Size, _hostView.Lines);
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+ Assert.Equal (_horizontal.Position, _hostView.Left);
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+ Assert.Equal (_horizontal.Size, _hostView.Cols);
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+ }
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+
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+ [Fact]
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+ public void ChangedPosition_Update_The_Hosted_View ()
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+ {
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+ Hosting_A_View_To_A_ScrollBarView ();
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+
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+ AddHandlers ();
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+
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+ _vertical.Position = 2;
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+ Assert.Equal (_vertical.Position, _hostView.Top);
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+
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+ _horizontal.Position = 5;
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+ Assert.Equal (_horizontal.Position, _hostView.Left);
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+ }
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+
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+ [Fact]
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+ public void ChangedPosition_Negative_Value ()
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+ {
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+ Hosting_A_View_To_A_ScrollBarView ();
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+
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+ AddHandlers ();
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+
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+ _vertical.Position = -20;
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+ Assert.Equal (0, _vertical.Position);
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+ Assert.Equal (_vertical.Position, _hostView.Top);
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+
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+ _horizontal.Position = -50;
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+ Assert.Equal (0, _horizontal.Position);
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+ Assert.Equal (_horizontal.Position, _hostView.Left);
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+ }
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+
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+ [Fact]
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+ public void DrawContent_Update_The_ScrollBarView_Position ()
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+ {
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+ Hosting_A_View_To_A_ScrollBarView ();
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+
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+ AddHandlers ();
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+
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+ _hostView.Top = 3;
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+ _hostView.Redraw (_hostView.Bounds);
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+ Assert.Equal (_vertical.Position, _hostView.Top);
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+
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+ _hostView.Left = 6;
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+ _hostView.Redraw (_hostView.Bounds);
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+ Assert.Equal (_horizontal.Position, _hostView.Left);
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+ }
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+
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+ [Fact]
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+ public void OtherScrollBarView_Not_Null ()
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+ {
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+ Hosting_A_View_To_A_ScrollBarView ();
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+
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+ AddHandlers ();
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+
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+ Assert.Equal (_vertical.OtherScrollBarView, _horizontal);
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+ Assert.Equal (_horizontal.OtherScrollBarView, _vertical);
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+ }
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+
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+ [Fact]
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+ public void ShowScrollIndicator_Check ()
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+ {
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+ Hosting_A_View_To_A_ScrollBarView ();
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+
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+ AddHandlers ();
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+
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+ Assert.True (_vertical.ShowScrollIndicator);
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+ Assert.True (_horizontal.ShowScrollIndicator);
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+ }
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+
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+ [Fact]
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+ public void KeepContentAlwaysInViewport_True ()
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+ {
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+ Hosting_A_View_To_A_ScrollBarView ();
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+
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+ AddHandlers ();
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+
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+ _vertical.Position = 50;
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+ Assert.Equal (_vertical.Position, _vertical.Size - _vertical.Bounds.Height + 1);
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+ Assert.Equal (_vertical.Position, _hostView.Top);
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+
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+ _horizontal.Position = 150;
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+ Assert.Equal (_horizontal.Position, _horizontal.Size - _horizontal.Bounds.Width + 1);
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+ Assert.Equal (_horizontal.Position, _hostView.Left);
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+ }
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+
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+ [Fact]
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+ public void KeepContentAlwaysInViewport_False ()
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+ {
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+ Hosting_A_View_To_A_ScrollBarView ();
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+
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+ AddHandlers ();
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+
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+ _vertical.KeepContentAlwaysInViewport = false;
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+ _vertical.Position = 50;
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+ Assert.Equal (_vertical.Position, _vertical.Size - 1);
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+ Assert.Equal (_vertical.Position, _hostView.Top);
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+
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+ _horizontal.Position = 150;
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+ Assert.Equal (_horizontal.Position, _horizontal.Size - 1);
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+ Assert.Equal (_horizontal.Position, _hostView.Left);
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+ }
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+
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+ [Fact]
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+ public void AutoHideScrollBars_Check ()
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+ {
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+ Hosting_A_View_To_A_ScrollBarView ();
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+
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+ AddHandlers ();
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+
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+ _hostView.Lines = 10;
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+ _hostView.Redraw (_hostView.Bounds);
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+ Assert.False (_vertical.ShowScrollIndicator);
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+ _hostView.Cols = 60;
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+ _hostView.Redraw (_hostView.Bounds);
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+ Assert.False (_horizontal.ShowScrollIndicator);
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+
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+ _hostView.Lines = 40;
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+ _hostView.Redraw (_hostView.Bounds);
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+ Assert.True (_vertical.ShowScrollIndicator);
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+ _hostView.Cols = 120;
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+ _hostView.Redraw (_hostView.Bounds);
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+ Assert.True (_horizontal.ShowScrollIndicator);
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+ }
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+ }
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+}
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