fix(ui): auto-scroll the lists sidebar while dragging near its top/bottom edge

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
2026-10-02 17:16:34 +02:00
parent ff7197c410
commit bba7117d54
3 changed files with 91 additions and 1 deletions
@@ -0,0 +1,40 @@
+using ClaudeDo.Ui.Views.Islands;
+using Xunit;
+
+namespace ClaudeDo.Ui.Tests;
+
+public class ListsAutoScrollTests
+{
+    [Fact]
+    public void Middle_of_viewport_does_not_scroll() =>
+        Assert.Equal(0, ListsAutoScroll.Delta(300, 600));
+
+    [Fact]
+    public void Top_band_scrolls_up_and_speeds_up_towards_the_edge()
+    {
+        var near = ListsAutoScroll.Delta(30, 600);
+        var edge = ListsAutoScroll.Delta(0, 600);
+        Assert.True(near < 0);
+        Assert.True(edge < near);
+    }
+
+    [Fact]
+    public void Bottom_band_scrolls_down_and_speeds_up_towards_the_edge()
+    {
+        var near = ListsAutoScroll.Delta(570, 600);
+        var edge = ListsAutoScroll.Delta(600, 600);
+        Assert.True(near > 0);
+        Assert.True(edge > near);
+    }
+
+    [Fact]
+    public void Pointer_outside_the_viewport_is_clamped_to_max_step() =>
+        Assert.Equal(ListsAutoScroll.Delta(0, 600), ListsAutoScroll.Delta(-50, 600));
+
+    [Fact]
+    public void Tiny_or_empty_viewport_is_safe()
+    {
+        Assert.Equal(0, ListsAutoScroll.Delta(0, 0));
+        Assert.True(ListsAutoScroll.Delta(5, 20) < 0);
+    }
+}