Handle the case where examples is null for all components

[abidlabs]

Example values can be null but this case wasn't really handled for any of the components. This PR handles the case for all components as part of fixing #5067. Also fixes the image distortion issue for examples mentioned here: #7180

To test, at least for gr.Textbox and gr.Image, use @radames's test code from #7180:

import gradio as gr
from PIL import Image
import requests

img_s_example = ["https://source.unsplash.com/random/512x512",
                 "https://source.unsplash.com/random/512x1000",
                 "https://source.unsplash.com/random/1000x512"]

pil_imgs = [Image.open(requests.get(url, stream=True).raw) for url in img_s_example]
names = [img.save(f'example_{i}.jpg') or f'example_{i}.jpg' for i, img in enumerate(pil_imgs)]
def predict(text, image):
    return image.rotate(45)

with gr.Blocks() as demo:
    with gr.Row():
      with gr.Column():
        image = gr.Image(label="in")
        text = gr.Text()
      with gr.Column(): 
        image_out = gr.Image(label="ou")
        greet_btn = gr.Button("Rotate")
    greet_btn.click(fn=predict,
                    inputs=[text, image],
                    outputs=[image_out])
    gr.Examples(
        examples=[
            ["hello", "./example_0.jpg"],
            [None, None],
            [None, "./example_1.jpg"],
            [None, "./example_2.jpg"],
            ["dsdsd", None],
        ],
        fn=predict,
        inputs=[text, image],
        outputs=[image_out]
    )

if __name__ == "__main__":
    demo.launch()

Closes: #7180
Closes: #5067

[gradio-pr-bot]

🪼 branch checks and previews

•	Name	Status	URL
	Spaces	ready!	Spaces preview
	Website	ready!	Website preview
	Storybook	ready!	Storybook preview
	Visual tests	all good!	Build review
🦄	Changes	detected!	Details

---

Install Gradio from this PR

pip install https://gradio-builds.s3.amazonaws.com/f3e3c5c02f1069c1180004a46909309544f42523/gradio-4.16.0-py3-none-any.whl

Install Gradio Python Client from this PR

pip install "gradio-client @ git+https://github.com/gradio-app/gradio@f3e3c5c02f1069c1180004a46909309544f42523#subdirectory=client/python"

[gradio-pr-bot]

🦄 change detected

This Pull Request includes changes to the following packages.

Package	Version
@gradio/audio	patch
@gradio/checkbox	patch
@gradio/code	patch
@gradio/colorpicker	patch
@gradio/dataset	patch
@gradio/dropdown	patch
@gradio/file	patch
@gradio/fileexplorer	patch
@gradio/image	patch
@gradio/markdown	patch
@gradio/model3d	patch
@gradio/number	patch
@gradio/radio	patch
@gradio/simpledropdown	patch
@gradio/simpleimage	patch
@gradio/simpletextbox	patch
@gradio/textbox	patch
@gradio/video	patch
gradio	patch

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Handle the case where examples is null for all components

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[abidlabs]

The static tests are failing even though those files are untouched by this PR. @whitphx do you have any idea of what could be going on?

[whitphx]

Hmm I can't find what's the problem

[freddyaboulton]

Looks good to me but noticed an issue with the empty video. Is it possible to test this via story book? Or is a unit test better here? CC @hannahblair

[freddyaboulton]

In this case we see a black box - I think it would be better to omit it entirely to be consistent with image and the other components

[abidlabs]

Makes sense

[abidlabs]

Hmm I can't find what's the problem

Thanks @whitphx. Should be fixed now, it was this issue (internal link)

[abidlabs]

Thanks @freddyaboulton for the review, I'll fix those issues and add visual tests to storybook.

[abidlabs]

Ok I've added stories for 4 components -- figured that this should be good to catch any regressions without bloating the number of visual tests.

Should be good for another look @freddyaboulton @hannahblair

[hannahblair]

non-blocking + tiny nit: these expressions could be written as value && value.toLocaleString()

[abidlabs]

Thanks for pointing this out @hannahblair. As I was testing this, I realized that my original approach won't work since value for Checkbox can be a boolean and if its False, that gets rendered as an empty string. Will revise

[hannahblair]

Nice! Stories look good to me - agreed that they'll be a good way of catching regressions 👌

[freddyaboulton]

Very nice @abidlabs !

[abidlabs]

Thanks @freddyaboulton and @hannahblair for reviewing!

[TonyAssi]

I'm still having trouble displaying example images on mobile (iOS Chrome),
https://huggingface.co/spaces/tonyassi/image-editor-example

4.16.0 didn't work

Also the solution here doesn't work. In requirements.txt I'm using:
https://gradio-builds.s3.amazonaws.com/f3e3c5c02f1069c1180004a46909309544f42523/gradio-4.16.0-py3-none-any.whl

[abidlabs]

Hi @TonyAssi what issue are you running into? This PR didn't handle displaying images on mobile, it was related to setting examples to None.