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codemonkeychris merged 2 commits into from
May 15, 2026
Merged

docs(skill): add Canvas recipe, document name collision workaround #292

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f5f3efa
docs(skill): add Canvas recipe, document name collision
sundaramramaswamy May 14, 2026
5aa37b4
refactor: move Canvas recipe out of getting-started
sundaramramaswamy May 15, 2026
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22 changes: 22 additions & 0 deletions plugins/reactor/skills/reactor-getting-started/SKILL.md
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Expand Up @@ -398,6 +398,28 @@ class ChildView : Component

Nested `.Provide()` overrides the outer for its subtree only. If no provider is present, `UseContext` returns the `Context<T>` default.

### Canvas (absolute positioning — drawing, diagrams, games)

> ⚠️ `using static Factories` brings a `Canvas()` factory that shadows `Microsoft.UI.Xaml.Controls.Canvas`.
> **Do NOT call `Canvas.SetLeft()`/`Canvas.SetTop()`** — use the fluent `.Canvas(left, top)` modifier instead.

```csharp
Canvas(
// Position children with the .Canvas(left, top) extension method
Border(TextBlock("A")).Canvas(left: 50, top: 30),
Border(TextBlock("B")).Canvas(left: 200, top: 100),

// Center on a point (anchor 0.5, 0.5)
Ellipse().Width(20).Height(20).CenterAt(x: 150, y: 75)
) with { Width = 400, Height = 300, Background = Theme.CardBackground }
```

**Key points:**
- `.Canvas(left, top)` sets attached Canvas.Left / Canvas.Top — works on any child element.
- `.CenterAt(x, y)` centers the element at (x,y) — adjusts for element size after layout.
- Canvas itself has record properties: `Width`, `Height`, `Background`.
- For shapes: use `Rectangle()`, `Ellipse()`, `Line(x1, y1, x2, y2)`, `Path(data)`.

## Bootstrap

`mur pack-local` (selfhost) and `nuget.config` (consumer outside the source clone) — see the top-level `SKILL.md`'s "Which mode are you in?" section. If selfhost restore fails with "package Microsoft.UI.Reactor 0.0.0-local was not found", run `mur pack-local`.
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