Builds on b0495514 (SignaturePadControl + SignaturePadData) with a
full Avalonia page that captures signatures, renders them as Polylines,
and persists the wire-format payload to ~/.local/share/PostIt/signatures
as JSON v1.
Scope
- New SignaturePage (axaml + code-behind) hosts the render-agnostic
control: a fixed-size Border is the hit-test surface, an overlaid
Canvas is rebuilt on every RedrawRequested from the Strokes buffer.
- SignaturePageViewModel wraps the control: exposes StrokeCount /
PointCount / StatusMessage, Clear and CaptureAsync commands, and
Attach/Detach for view-lifetime ownership.
- CaptureAsync writes a JSON envelope { format, coordinateMax,
capturedAtUtc, strokes, strokeCount } to
LocalApplicationData/PostIt/signatures/signature-yyyyMMdd-HHmmssfff.json.
This is a stop-gap; the production transport will be
POST /api/signature/{devisId} on Yavsc.Api (commit 3+).
- Entry point is a [DEV] button on MainPage that pushes the page
onto the NavigationPage. The production trigger is a SignalR push
from Yavsc.Org ("devis received, sign here") landing on a hub
handler — the button and its Click handler are explicitly marked
dev-only and tracked for removal in the same commit that wires
the SignalR handler.
Plumbing
- App.axaml.cs: SignaturePage and SignaturePageViewModel registered
as Transient in the DI container.
- ViewLocator: routes SignaturePageViewModel to SignaturePage.
- SignaturePadData: adds PointCount (sum of pairs across strokes),
used by the VM status bar and the test surface.
Tests (57/57 green, 9 new in this commit)
- SignaturePageViewModelTests: constructors and dimension validation,
Attach/Detach idempotence, StrokeCompleted and Clear propagate to
the VM, CaptureAsync on empty buffer is a no-op, CaptureAsync on a
non-empty buffer writes a v1 envelope with the expected
structure (parsed back via JsonDocument, not text matching), and
creates the destination directory if missing.
- All previously-green tests (48) remain green.
Out of scope
- POST /api/signature endpoint on Yavsc.Api (commit 3).
- SignalR handler that opens the page on a "devis received" push.
- Rasterization: this commit only proves capture and persistence;
the visible ink is a Polyline reconstruction, not a PNG, by
design (per the wire-format decision in commit 1).
Note on SignaturePadData
- The PointCount property was added after b0495514 landed. It is
folded into this commit rather than amending b0495514 to keep
the existing history readable; the change is mechanical and
tested by the new SignaturePageViewModelTests.
b939c403f6