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feat(D.2b): anchor layout — vital bars stretch with window; drop Vitals heading

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Add AnchorEdges [Flags] enum and Anchors property (default Left|Top, so
all existing elements are unchanged) to UiElement. ApplyAnchor() captures
the design-time margins on first call then recomputes Left/Top/Width/Height
each frame; DrawSelfAndChildren drives it for every child before painting.
ComputeAnchoredRect is public + static so it can be unit-tested without a
running frame loop.

MarkupDocument.Build gains a private Anchor() CSV parser and threads it
into the <meter> initializer via the anchor= attribute.

vitals.xml: remove title="Vitals" (retail vitals has no heading) and add
anchor="left,top,right" to all three meter bars so they stretch when the
panel is dragged wider.

Two new xUnit tests in UiRootInputTests: Left+Right stretches width;
Left+Top only keeps fixed size. All 19 App.Tests green.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Erik 2026-06-14 18:58:58 +02:00
parent af91b8432a
commit f911b5f0af
4 changed files with 102 additions and 4 deletions
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17
src/AcDream.App/UI/MarkupDocument.cs
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@ -65,6 +65,7 @@ public static class MarkupDocument
BarColor = Color((string?)el.Attribute("color")),
Fill = BindFloat((string?)el.Attribute("fill"), binding),
Label = () => (cur(), max()) is (uint c, uint m) ? $"{c}/{m}" : null,
Anchors = Anchor((string?)el.Attribute("anchor")),
});
break;
// future element kinds (label, button, image) added here
@ -123,4 +124,20 @@ public static class MarkupDocument
if (expr is null || expr.Length < 3 || expr[0] != '{' || expr[^1] != '}') return null;
return binding.GetType().GetProperty(expr[1..^1]);
}
private static AnchorEdges Anchor(string? csv)
{
if (string.IsNullOrWhiteSpace(csv)) return AnchorEdges.Left | AnchorEdges.Top;
var a = AnchorEdges.None;
foreach (var part in csv.Split(',', System.StringSplitOptions.TrimEntries | System.StringSplitOptions.RemoveEmptyEntries))
a |= part.ToLowerInvariant() switch
{
"left" => AnchorEdges.Left,
"top" => AnchorEdges.Top,
"right" => AnchorEdges.Right,
"bottom" => AnchorEdges.Bottom,
_ => AnchorEdges.None,
};
return a == AnchorEdges.None ? AnchorEdges.Left | AnchorEdges.Top : a;
}
}