[image_picker] Add desktop support (#3882)

(This is the combination PR for overall review.)

This adds initial desktop support across all three desktop platforms:
- Adds the concept of a camera delegation as discussed in https://github.com/flutter/flutter/issues/102115, and adds a helper base class at the platform interface level for implementations that want to use that approach. (Sharing it simplifies both the platform implementations and the client usage.)
- Adds a new app-facing and platform-interface API to check at runtime for support for a given source, to make writing code using `image_picker` in a world of dynamic camera support viable. (In particular this is critical for published packages that use `image_picker`, as they won't know in advance if a client app will have a delegate set up).
- Updates the Windows implementation to:
  - use the new delegation base class
  - implement the newer `getImageFromSource` API as an opportunistic fix while changing the code (if not implemented, it would fall back to `getImage`)
  - use new APIs in its example.
- Made macOS and Linux implementations that are clones of the Windows approach. They are both slightly simpler however, as MIME type (for Linux) and UTI (for macOS) allow creating generic "image" and "video" filters instead of having to hard-code a file extension list.

Since in my opinion this level of support is sufficient to allow basic real-world use of the desktop implementations, due to having a structure in place for handling camera support, this includes endorsing the desktop implementations. It is still the case that desktop does not support image resizing, which isn't ideal, but I don't think we should block on that. It is clearly documented in the README.

The desktop implementations are separate packages even though they are mostly the same right now because:
- the amount of (non-example) code being duplicated is small, and
- it makes it much easier for us to change platform implementations over time; e.g., recent versions of macOS support `PHPicker`, meaning we can later add native code for that to the macOS implementation, with just a fallback to the current `file_selector` wrapper. It's plausible that better native options for Windows and/or Linux may become available in the future as well.

Fixes https://github.com/flutter/flutter/issues/102115
Fixes https://github.com/flutter/flutter/issues/102320
Fixes https://github.com/flutter/flutter/issues/85100
67 files changed
tree: e1e66ffeda22470b0d00cd003efd7ca027f2ccb4
  1. .ci/
  2. .github/
  3. packages/
  4. script/
  5. third_party/
  6. .ci.yaml
  7. .cirrus.yml
  8. .clang-format
  9. .gitattributes
  10. .gitignore
  11. .gitmodules
  12. .metadata
  13. analysis_options.yaml
  14. AUTHORS
  15. CODEOWNERS
  16. CONTRIBUTING.md
  17. customer_testing.bat
  18. customer_testing.sh
  19. LICENSE
  20. README.md
README.md

Flutter Packages

Build Status Release Status OpenSSF Scorecard

This repo is a companion repo to the main flutter repo. It contains the source code for Flutter's first-party packages (i.e., packages developed by the core Flutter team). Check the packages directory to see all packages.

These packages are also available on pub.

Issues

Please file any issues, bugs, or feature requests in the main flutter repo. Issues pertaining to this repository are labeled “package”.

Contributing

If you wish to contribute a new package to the Flutter ecosystem, please see the documentation for developing packages. You can store your package source code in any GitHub repository (the present repo is only intended for packages developed by the core Flutter team). Once your package is ready you can publish to the pub repository.

If you wish to contribute a change to any of the existing packages in this repo, please review our contribution guide, and send a pull request.

Packages

These are the packages hosted in this repository:

PackagePubPointsPopularityIssuesPull requests
animationspub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
camerapub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
cross_filepub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
css_colorspub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
cupertino_iconspub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
espressopub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
extension_google_sign_in_as_googleapis_authpub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
file_selectorpub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
flutter_adaptive_scaffoldpub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
flutter_imagepub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
flutter_lintspub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
flutter_markdownpub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
flutter_plugin_android_lifecyclepub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
flutter_template_imagespub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
go_routerpub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
go_router_builderpub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
google_maps_flutterpub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
google_sign_inpub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
image_pickerpub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
in_app_purchasepub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
ios_platform_imagespub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
local_authpub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
metrics_centerpub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
multicast_dnspub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
palette_generatorpub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
path_providerpub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
pigeonpub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
pointer_interceptorpub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
plugin_platform_interfacepub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
quick_actionspub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
rfwpub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
shared_preferencespub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
standard_message_codecpub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
url_launcherpub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
video_playerpub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
web_benchmarkspub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
webview_flutterpub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label
xdg_directoriespub packagepub pointspopularityGitHub issues by-labelGitHub pull requests by-label