How do I get the selected Assets in the Asset Browser using the API?

Question

Similar to Python : Get selected objects in outliner

How can one access the assets that are currently selected in the asset browser editor using the python API ?

I assume it should be available on a per-editor basis since, contrary to the outliner where selection state is shared between all editors, different asset browser editors can have different asset selection states :

Answer 1

I found the answer while researching another answer.

It's actually an attribute of File context which unless I'm mistaken does require the piece of code to be executed inside the context of the asset browser.

Here's the slightly altered script that adds a button in the Asset Browser header that, when clicked, outputs some information about the selected assets in the console :

import bpy
from pathlib import Path


class PrintSelectedAssets(bpy.types.Operator):
    bl_idname = "asset.print_selected_assets"
    bl_label = "Print Selected Assets"

    @classmethod
    def poll(cls, context):
        return context.selected_asset_files

    def execute(self, context):
        current_library_name = context.area.spaces.active.params.asset_library_ref
        if current_library_name != "LOCAL":  # NOT Current file
            library_path = Path(context.preferences.filepaths.asset_libraries.get(current_library_name).path)

        for asset_file in context.selected_asset_files:
            if current_library_name == "LOCAL":
                print(f"{asset_file.local_id.name} is selected in the asset browser. (Local File)")
            else:
                asset_fullpath = library_path / asset_file.relative_path
                print(f"{asset_fullpath} is selected in the asset browser.")
                print(f"It is located in a user library named '{current_library_name}'")
            
        return {"FINISHED"}


def display_button(self, context):
    self.layout.operator(PrintSelectedAssets.bl_idname)


def register():
    bpy.utils.register_class(PrintSelectedAssets)
    bpy.types.ASSETBROWSER_MT_editor_menus.append(display_button)


def unregister():
    bpy.types.ASSETBROWSER_MT_editor_menus.remove(display_button)
    bpy.utils.unregister_class(PrintSelectedAssets)


if __name__ == "__main__":
    register()