94 lines
2.8 KiB
C#
94 lines
2.8 KiB
C#
using AcDream.App.UI;
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using Xunit;
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namespace AcDream.App.Tests.UI;
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public class UiScrollableTests
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{
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[Fact]
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public void Clamp_KeepsScrollWithinContent()
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{
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var s = new UiScrollable { ContentHeight = 300, ViewHeight = 100 };
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s.SetScrollY(500);
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Assert.Equal(200, s.ScrollY);
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s.SetScrollY(-50);
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Assert.Equal(0, s.ScrollY);
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}
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[Fact]
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public void FitsView_PinsToZero()
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{
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var s = new UiScrollable { ContentHeight = 80, ViewHeight = 100 };
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s.SetScrollY(40);
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Assert.Equal(0, s.ScrollY);
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Assert.False(s.HasOverflow);
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}
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[Fact]
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public void ThumbRatio_IsViewOverContent_ClampedToOne()
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{
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var s = new UiScrollable { ContentHeight = 400, ViewHeight = 100 };
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Assert.Equal(0.25f, s.ThumbRatio, 3);
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var full = new UiScrollable { ContentHeight = 50, ViewHeight = 100 };
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Assert.Equal(1f, full.ThumbRatio, 3);
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}
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[Fact]
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public void PositionRatio_MapsScrollToZeroOne()
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{
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var s = new UiScrollable { ContentHeight = 300, ViewHeight = 100 };
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s.SetScrollY(100);
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Assert.Equal(0.5f, s.PositionRatio, 3);
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s.SetScrollY(200);
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Assert.Equal(1f, s.PositionRatio, 3);
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}
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[Fact]
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public void SetPositionRatio_IsInverseOfPositionRatio()
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{
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var s = new UiScrollable { ContentHeight = 300, ViewHeight = 100 };
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s.SetPositionRatio(0.5f);
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Assert.Equal(100, s.ScrollY);
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}
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[Fact]
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public void ScrollByLines_AdvancesByLineHeight()
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{
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var s = new UiScrollable { ContentHeight = 1000, ViewHeight = 100, LineHeight = 16 };
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s.ScrollByLines(-2);
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Assert.Equal(0, s.ScrollY);
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s.SetScrollY(50);
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s.ScrollByLines(2);
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Assert.Equal(82, s.ScrollY);
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}
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[Fact]
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public void ScrollByPage_AdvancesByViewHeight()
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{
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var s = new UiScrollable { ContentHeight = 1000, ViewHeight = 100, LineHeight = 16 };
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s.SetScrollY(200);
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s.ScrollByPage(1);
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Assert.Equal(300, s.ScrollY);
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}
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[Fact]
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public void SetExtents_PreservesEndButRetainsUserScrollback()
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{
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var s = new UiScrollable();
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s.SetExtents(contentHeight: 400, viewHeight: 100, preserveEnd: true);
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Assert.Equal(300, s.ScrollY);
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// A scrollbar/wheel interaction moves off the end. Repeating layout with
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// the same extents must not overwrite that user-selected position.
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s.ScrollByLines(-1);
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Assert.Equal(284, s.ScrollY);
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s.SetExtents(contentHeight: 400, viewHeight: 100, preserveEnd: true);
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Assert.Equal(284, s.ScrollY);
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// Returning to the end restores auto-pin for newly appended content.
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s.ScrollToEnd();
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s.SetExtents(contentHeight: 500, viewHeight: 100, preserveEnd: true);
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Assert.Equal(400, s.ScrollY);
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}
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}
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