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fix(ui): retail scrollbar parity — button seating, full-track thumb, hover/pressed states
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Owner report (2026-08-24): our scrollbar arrows pointed the wrong way,
the thumb vanished when there was nothing to scroll, and neither the
thumb nor the arrow buttons reacted to hover/press.

All three are one retail mechanism we had not ported:

1. Seating: UIElement_Scrollbar::UpdateScrollingArea @0x00470AA0 moves
   the INCREMENT designee (attribute 0x77) to the top/left corner and
   the DECREMENT designee (0x78) to the bottom/right, ignoring authored
   positions. The vertical base skin (0x10000455 in layout 0x2100003E)
   authors the DOWN-arrow decrement at Y=0 and the UP-arrow increment
   at Y=32 (live-DAT probed; sprite art visually verified from decoded
   PNGs), so our authored-Y ordering drew both arrows upside down.
   DatWidgetFactory now seats by designation; the hand-wired sites
   (CharacterStatController, ExternalContainerController, the
   Config/Vendor menu chrome) share the new RetailScrollbarChrome
   catalog instead of local constants.

2. Full-track thumb: UpdateLayout @0x004710d0 sizes the thumb from
   proportion attribute 0x88, which DEFAULTS to 1.0 — a content-fits
   bar shows a thumb filling the whole track; disabled only removes
   input and the page regions. Our draw skipped the thumb entirely on
   !HasOverflow.

3. States: every arrow button and thumb slice authors Normal (red gem /
   dark navy), Normal_rollover (amber gem / bright blue) and
   Normal_pressed (gold highlight / dark) media. The widget now tracks
   thumb hover and selects rollover media on hover and pressed media
   while dragging; the factory extracts the thumb-state media for both
   the 3-slice and single-sprite thumb shapes.

ScrollbarSkinLiveDatTests pins the designations and state media against
the installed DAT so a revision or importer regression fails loudly.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Erik 2026-08-24 19:20:43 +02:00
parent 35abbe1d0d
commit 8fd3d1a9f0
12 changed files with 541 additions and 64 deletions
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7
src/AcDream.App/UI/Layout/ConfigOptionsPageController.cs
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@ -272,8 +272,11 @@ public static class ConfigOptionsPageController
public const uint ScrollThumbTop = 0x06004C60u;
public const uint ScrollThumb = 0x06004C63u;
public const uint ScrollThumbBottom = 0x06004C66u;
public const uint ScrollUp = 0x06004C69u;
public const uint ScrollDown = 0x06004C6Cu;
// Retail seating (UpdateScrollingArea @0x00470AA0): the top slot
// takes the INCREMENT designee's UP-arrow art, the bottom the
// DECREMENT designee's DOWN-arrow (see RetailScrollbarChrome).
public const uint ScrollUp = RetailScrollbarChrome.UpNormal;
public const uint ScrollDown = RetailScrollbarChrome.DownNormal;
}
/// <summary>Applies <see cref="MenuChromeSprites"/> + geometry to a