mirror of
https://github.com/kuhyx/utils.git
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Krzysztof kuhy Rudnicki
d4fca83c9f
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
39 lines
1.3 KiB
Markdown
39 lines
1.3 KiB
Markdown
# data_transfer_flutter
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Shared "export to a JSON file / import from a JSON file" plumbing for kuhy's
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Flutter apps. Apps keep their own export CONTENT; this owns the file plumbing
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and the envelope.
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## Install
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```yaml
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dependencies:
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data_transfer_flutter:
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git:
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url: https://github.com/kuhyx/utils
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ref: data_transfer_flutter-v0.2.1
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path: data_transfer_flutter
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```
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## Use
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```dart
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final saved = await exportJson(fileName: 'x.json', json: envelope);
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final map = await pickJson(); // null when cancelled
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```
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- `exportJson` / `exportJsonText` save to **device storage**: Android and iOS
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use the system "Save as" document picker (`file_picker` `saveFile`, i.e.
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ACTION_CREATE_DOCUMENT), desktop a save dialog (`file_selector`), web a
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browser download. Returns false when cancelled.
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- `exportTextFile` does the same for any text (`text/csv`, `text/calendar`).
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- `shareJson` is an optional second action (share sheet). It is never the
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only way out: a stock phone's share sheet has no local save target.
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- `pickJson` / `pickJsonText` use the system open-document picker.
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- `buildEnvelope` / `validateEnvelope` / `parseEnvelope` write and check
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`{format, version, exported_at, ...}`; mismatches throw a typed
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`EnvelopeException` (always a `FormatException`).
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Tests fake `DataTransfer.platform` (a `DataTransferPlatform`); restore it in
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`tearDown`.
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