how to customize preview UX similar to picker UX

[rbarzel]

This is a very impressive package!!!

I'm able to successfully customize the picker UX by passing my custom AssetPickerBuilderDelegate into AssetPicker.pickAssetsWithDelegate().

But I can't figure out how to customize the preview UX. (See an example of the screen I want to customize below.)

I think I need to create a custom AssetPickerViewerBuilderDelegate, but I don't' understand how to tell AssetPicker to use my custom AssetPickerViewerBuilderDelegate.

I'd appreciate any guidance. Thanks!

[AlexV525]

• https://pub.dev/documentation/wechat_assets_picker/latest/wechat_assets_picker/AssetPickerBuilderDelegate/viewAsset.html

• flutter_wechat_assets_picker/lib/src/delegates/asset_picker_builder_delegate.dart

  Line 871 in 0015480

  Future<void> viewAsset(

[rbarzel]

Thanks for the quick reply @AlexV525. It seems I can customize the preview of an individual asset by overriding the AssetPickerBuilderDelegate.viewAsset. But viewAsset is not called when I click Preview to view all selected assets, and that's the screen I'm trying to customize.

I'm guessing that I need to override AssetPickerBuilderDelegate.previewButton, and in my override code I should call AssetPickerViewer.pushToViewerWithDelegate and provide my own AssetPickerViewerBuilderDelegate. Is this the right approach?

[AlexV525]

I'll check with the preview button later.

[rbarzel]

I was able to customize the preview screen by following the suggestion of @AlexV525 to override DefaultAssetPickerBuilderDelegate.viewAsset and inside that method call AssetPickerViewer.pushToViewerWithDelegate using my own implementation of AssetPickerViewerBuilderDelegate.

But this seems like a brittle solution because when the source repo implementation of viewAsset changes my (customized) version will be out of date. It would be great if the DefaultAssetPickerBuilderDelegate constructor had an optional argument like viewerBuilder = DefaultAssetPickerViewerBuilderDelegate. And viewAsset would always call pushToViewerWithDelegate.

Thanks for the help and for the great package!