ds-galo/openspec/changes/add-mobile-photo-zoom/.openspec.yaml at beeb4c7c09df2a15bf2e6eead04fa5b7257b3ac7 - ds-galo - Gitea: Git with a cup of tea

iu/ds-galo

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iu f6df9e23f2 feat(viewer): add pinch-to-zoom for photos on Android

Add pinch/pan/double-tap zoom to the full-screen photo viewer, mirroring the
web viewer semantics:

- scale is a multiplier of the natural size, capped at 200%; the fitted view
  is the lower bound
- double tap toggles fitted view <-> 100% natural anchored at the tap
- the original loads on zoom, with the preview kept as a placeholder so
  entering zoom never flashes a black surface
- the pager is disabled while zoomed (drags pan the image) and the zoom resets
  when leaving a photo
- video and 360 panoramas are unaffected

Implement PhotoZoom (zoom math) and ZoomableImage (gestures), wire it into
ViewerContent/MediaPage, and cover it with unit, Compose and device tests.

OpenSpec change: add-mobile-photo-zoom

2026-10-13 12:30:49 +03:00

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	`schema: spec-driven`
	`created: 2026-10-13`