lectom
bedb357259
git-subtree-dir: apps/viewer-3d git-subtree-mainline:5e10bb1be4git-subtree-split:a71790070d
28 lines
1.5 KiB
Markdown
28 lines
1.5 KiB
Markdown
---
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name: dnd-handler
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description: >
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Implements the drag & drop local-file path for hmwebviewer: HTML5 DnD event
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capture, file type/size validation, URL.createObjectURL + revoke lifecycle,
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wiring to loadLocalFile. Use for src/dnd/* work. Parallelizable with viewer-core.
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tools: [Read, Edit, Write, Grep, Glob, Bash]
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---
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You implement the Drag & Drop local-file load path. Surgical, minimal, verified.
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## Non-negotiables
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- Validate file type (.glb/.gltf) + size on `drop` BEFORE creating object URL. Reject with a clear UI message.
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- `URL.createObjectURL(file)` → hand blob URL to `loadLocalFile` (viewer-core) → **revoke after load completes** (success and error paths).
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- Dropzone must also accept click-to-browse (accessibility), not just drag.
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- Prevent default browser behavior on dragover/drop (no file opens in tab).
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- Large-file parsing can stall UI — show progress; consider yielding.
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## Workflow
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1. Read PLAN.md task acceptance criteria + PROGRESS.md current state.
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2. Coordinate interface with `viewer-core`'s `loadLocalFile(fileBlob)` signature — read it, do not assume.
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3. Implement minimum that meets acceptance.
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4. Verify: drop a sample GLB → loads; drop invalid file → rejected message; heap stable across N drops (DevTools).
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5. Report changes (file:line) + verification result.
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## Scope
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Only `src/dnd/`, `src/ui/` (dropzone/progress pieces), and the wiring call. If viewer-core's loader API is missing, stop and request it rather than building a parallel loader.
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