Access the assets dir easily

[omamkaz]

• Added the assets_dir_path method to be available for a developer to work with assets

Description

Fixes #3083

Test Code

import base64

import flet as ft


def lottie_base64(name: str) -> str:
    with open(ft.assets_dir_path("animations", name), "rb") as fr:
        return base64.b64encode(fr.read()).decode()


def main(page: ft.Page) -> None:
    page.title = "Test assets_dir_path"
    page.window.width = page.window.height = 600

    page.add(
        ft.Lottie(src_base64=lottie_base64("no_internet.json"), fit=ft.ImageFit.COVER)
    )

if __name__ == "__main__":
    ft.app(main)

Type of change

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

Checklist

• I signed the CLA.
• My code follows the style guidelines of this project

Screenshots

Additional details

Tested on

[x] Linux
[] Windows
[] MacOS

Summary by Sourcery

New Features:

• Introduce the assets_dir_path method in the flet.app module to provide convenient access to the assets directory.

[FeodorFitsner]

Thanks for the your PR. Could you give an example of how it's supposed to be used in a user app?

[omamkaz]

Thanks for the your PR. Could you give an example of how it's supposed to be used in a user app?

In my case the Lottie animation files don't work just base64, so I want to open the file and pass it as base64 data, and other examples of data you want to work with it like .csv files.

Example

class _LottieFiles:
    def __init__(self):
        for name in os.listdir(ft.assets_dir_path("animations")):
            # self.__setattr__(name.removesuffix(".json"), self.lottie_file(name))
            self.__setattr__(name.removesuffix(".json"), self.lottie_base64(name))

    @classmethod
    def lottie_file(cls, name: str) -> str:
        return ft.assets_dir_path("animations", name)

    @classmethod
    def lottie_base64(cls, name: str) -> str:
        with open(ft.assets_dir_path("animations", name), "rb") as fr:
            return base64.b64encode(fr.read()).decode()

LottieFiles = _LottieFiles()

## Test
ft.Lottie(src_base64=LottieFiles.no_internet., fit=ft.ImageFit.COVER)