0d3117596c
OnEvent handles the Scroll wheel in grid mode (mirrors UiText's sign), driving the shared UiScrollable. The bound gutter scrollbar (next task) is the primary scroll affordance; the wheel is the convenience path. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
65 lines
2.4 KiB
C#
65 lines
2.4 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 sealed class UiItemListScrollTests
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{
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private static UiItemList Grid(int items)
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{
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var list = new UiItemList { Columns = 6, CellWidth = 32, CellHeight = 32, Width = 192, Height = 96 };
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list.Flush(); // drop the default single cell
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for (int i = 0; i < items; i++) list.AddItem(new UiItemSlot());
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list.LayoutCells(); // drive the scroll model + position cells
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return list;
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}
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[Fact]
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public void RowCount_ceils_to_whole_rows()
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{
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Assert.Equal(0, UiItemList.RowCount(0, 6));
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Assert.Equal(1, UiItemList.RowCount(1, 6));
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Assert.Equal(7, UiItemList.RowCount(41, 6));
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}
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[Fact]
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public void Grid_drives_scroll_model_from_content()
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{
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var list = Grid(30); // 5 rows × 32 = 160 content, 96 view
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Assert.Equal(160, list.Scroll.ContentHeight);
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Assert.Equal(96, list.Scroll.ViewHeight);
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Assert.Equal(64, list.Scroll.MaxScroll);
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Assert.True(list.Scroll.HasOverflow);
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}
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[Fact]
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public void At_top_first_three_rows_visible_rest_clipped()
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{
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var list = Grid(30);
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Assert.True(list.GetItem(0)!.Visible); // row 0, top 0
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Assert.True(list.GetItem(12)!.Visible); // row 2, top 64 (+32 == 96)
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Assert.False(list.GetItem(18)!.Visible); // row 3, top 96 (off the bottom)
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}
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[Fact]
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public void Scrolled_one_row_shifts_window_and_clips_top_row()
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{
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var list = Grid(30);
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list.Scroll.SetScrollY(32);
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list.LayoutCells();
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Assert.False(list.GetItem(0)!.Visible); // row 0 scrolled above
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Assert.Equal(0f, list.GetItem(6)!.Top); // row 1 now at the view top
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Assert.True(list.GetItem(18)!.Visible); // row 3 now visible
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}
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[Fact]
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public void Wheel_down_scrolls_toward_the_bottom()
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{
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var list = Grid(30); // max scroll 64, LineHeight 32
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// Silk wheel +Y = up/older; UiText negates Data0. Wheel DOWN (Data0 < 0) → +ScrollY.
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var e = new UiEvent(0u, null, UiEventType.Scroll, Data0: -1);
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bool handled = list.OnEvent(e);
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Assert.True(handled);
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Assert.Equal(32, list.Scroll.ScrollY); // one line (32px) down
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}
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}
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