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feat(ui): D.2b-B — UiItemList N-cell grid mode

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Columns + CellWidth/CellHeight + a row-major CellOffset/LayoutCells pass.
CellWidth<=0 keeps the single-cell fill mode (toolbar slot sizes to the
list — unchanged); CellWidth>0 tiles cells in a grid. Layout runs on
AddItem and per-frame in OnDraw so a list resize reflows.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Erik 2026-06-20 22:34:30 +02:00
parent 132bf36daa
commit 4fd4b09f3f
2 changed files with 86 additions and 10 deletions
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53
src/AcDream.App/UI/UiItemList.cs
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@ -49,9 +49,48 @@ public sealed class UiItemList : UiElement
public void AddItem(UiItemSlot cell)
{
cell.SpriteResolve ??= SpriteResolve;
cell.Left = 0; cell.Top = 0; cell.Width = Width; cell.Height = Height;
_cells.Add(cell);
AddChild(cell);
LayoutCells();
}
/// <summary>Grid columns (row-major). 1 = single column. Ignored in fill mode.</summary>
public int Columns { get; set; } = 1;
/// <summary>Fixed cell width in grid mode. 0 = "fill the list" — the single cell sizes
/// to the whole list (the toolbar single-slot legacy). Set &gt;0 (with CellHeight) for a grid.</summary>
public float CellWidth { get; set; }
/// <summary>Fixed cell height in grid mode (pairs with CellWidth).</summary>
public float CellHeight { get; set; }
/// <summary>Row-major pixel offset of cell <paramref name="index"/> in a grid of
/// <paramref name="columns"/> columns at the given cell pitch.</summary>
internal static (float x, float y) CellOffset(int index, int columns, float cellW, float cellH)
{
int col = index % columns, row = index / columns;
return (col * cellW, row * cellH);
}
/// <summary>Position every cell per the current mode: fill (CellWidth&lt;=0) sizes the single
/// cell to the list; grid (CellWidth&gt;0) tiles cells row-major at the cell pitch.</summary>
private void LayoutCells()
{
if (CellWidth <= 0f)
{
if (_cells.Count > 0)
{
var c = _cells[0];
c.Left = 0; c.Top = 0; c.Width = Width; c.Height = Height;
}
return;
}
int cols = Columns < 1 ? 1 : Columns;
for (int i = 0; i < _cells.Count; i++)
{
var (x, y) = CellOffset(i, cols, CellWidth, CellHeight);
var cell = _cells[i];
cell.Left = x; cell.Top = y; cell.Width = CellWidth; cell.Height = CellHeight;
}
}
public void Flush()
@ -62,14 +101,8 @@ public sealed class UiItemList : UiElement
protected override void OnDraw(UiRenderContext ctx)
{
// The factory sets THIS list's Width/Height AFTER construction, so the cell
// (added in the ctor) starts 0x0. For the single-cell toolbar slot, keep the
// cell sized to the list each frame; the cell paints itself in the children
// pass that follows. (N-cell grid layout is the inventory phase.)
if (_cells.Count > 0)
{
var cell = _cells[0];
cell.Left = 0; cell.Top = 0; cell.Width = Width; cell.Height = Height;
}
// The factory sets Width/Height AFTER construction, so re-layout each frame:
// fill mode keeps the single toolbar cell sized to the list; grid mode tiles cells.
LayoutCells();
}
}