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feat(ui): D.2b — toolbar collapse-to-one-row (bottom-edge snap resize hides/shows row 2)

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UiElement.MaxHeight + ResizableEdges mask; UiCollapsibleFrame snaps height to the nearer
of {collapsed,expanded} and toggles row-2 visibility; GameWindow computes the two heights
from the layout + top-anchors the content. Amends IA-17. UiNineSlicePanel unsealed to
allow subclassing.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Erik 2026-06-20 18:33:35 +02:00
parent e58be3f030
commit f74e017509
8 changed files with 159 additions and 15 deletions
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8
src/AcDream.App/UI/UiElement.cs
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@ -125,11 +125,19 @@ public abstract class UiElement
public float MinWidth { get; set; } = 40f;
public float MinHeight { get; set; } = 40f;
/// <summary>Maximum height enforced while resizing (default unbounded). Pairs with MinHeight.</summary>
public float MaxHeight { get; set; } = float.MaxValue;
/// <summary>Allow horizontal (width) resize. Ignored unless <see cref="Resizable"/>.</summary>
public bool ResizeX { get; set; } = true;
/// <summary>Allow vertical (height) resize. Ignored unless <see cref="Resizable"/>.</summary>
public bool ResizeY { get; set; } = true;
/// <summary>Which edges may start a resize, beyond the ResizeX/ResizeY axis gates. Default: all.
/// Set to e.g. <see cref="ResizeEdges.Bottom"/> to allow only a bottom-edge drag (the collapse toolbar).</summary>
public ResizeEdges ResizableEdges { get; set; } =
ResizeEdges.Left | ResizeEdges.Right | ResizeEdges.Top | ResizeEdges.Bottom;
/// <summary>Edges this element anchors to in its parent. Default Left|Top
/// (pinned top-left, fixed size — no reflow). Left|Right stretches width.</summary>
public AnchorEdges Anchors { get; set; } = AnchorEdges.Left | AnchorEdges.Top;