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[Windows] Allow plugins to get views #51096

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loic-sharma
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Allow Flutter Windows plugins to get views by their ID.

Design doc: https://flutter.dev/go/desktop-multi-view-runner-apis

Part of flutter/flutter#143767
Part of flutter/flutter#142845

Pre-launch Checklist

  • I read the Contributor Guide and followed the process outlined there for submitting PRs.
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  • I read and followed the Flutter Style Guide and the C++, Objective-C, Java style guides.
  • I listed at least one issue that this PR fixes in the description above.
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  • I updated/added relevant documentation (doc comments with ///).
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// not destroy the underlying view.
std::shared_ptr<FlutterView> GetViewById(FlutterViewId view_id) const {
return std::make_shared<FlutterView>(
FlutterDesktopPluginRegistrarGetViewById(registrar(), view_id));
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@loic-sharma loic-sharma Feb 29, 2024

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⚠️ This API returns a std::shared_ptr<FlutterView> instead of a FlutterView*. This is a change from the original design.

The original PluginRegistrarWindows::GetViewById proposal returned a FlutterView* to align with PluginRegistrarWindows::GetView. However, this would require the PluginRegistrarWindows to own/manage FlutterViews, similar to how it stores the implicit view today. We would need to introduce some other API to allow cleaning up these FlutterViews. By returning a std::shared_ptr<FlutterView>, the user can clean up the FlutterView themselves when they no longer need the view reference.

@loic-sharma loic-sharma force-pushed the windows_plugin_registar_get_view branch from 870b27b to c3a423f Compare February 29, 2024 18:55
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Gentle reminder @yaakovschectman @cbracken, this is ready for review :)

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@yaakovschectman yaakovschectman left a comment

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LGTM

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@cbracken cbracken left a comment

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LGTM stamp from a Japanese personal seal

No comments other than thumbs-up to the const-ification.

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loic-sharma commented Mar 6, 2024

@yaakovschectman @cbracken FYI I pushed a new commit: f89609f. Before this fix, nullptr wasn't returned if the view does not exist. I also added tests.

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re-lgtm!

@loic-sharma loic-sharma added the autosubmit Merge PR when tree becomes green via auto submit App label Mar 6, 2024
@auto-submit auto-submit bot merged commit b2adf74 into flutter:main Mar 6, 2024
26 checks passed
engine-flutter-autoroll added a commit to engine-flutter-autoroll/flutter that referenced this pull request Mar 6, 2024
auto-submit bot pushed a commit to flutter/flutter that referenced this pull request Mar 6, 2024
…144732)

flutter/engine@31bbe61...b2adf74

2024-03-06 737941+loic-sharma@users.noreply.github.com [Windows] Allow plugins to get views (flutter/engine#51096)

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