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### A link to download Qrcode
# this is demo is based on the topic discussed on stackoverflow
# https://stackoverflow.com/questions/78045476/streamlit-re-runs-app-on-button-click-delaying-download/79008691#79008691
import simplestart as ss
ss.md('''
#### In this demo, you can change the URL in the input to generate a QR code image. Click the link below to download it.
---
''')
import qrcode
from io import BytesIO
from PIL import Image
#api
def generate_qr_code(link): # Generate QR Code
qr = qrcode.QRCode(
version=1.00,
error_correction=qrcode.constants.ERROR_CORRECT_L,
box_size=10,
border=2,
)
qr.add_data(link)
qr.make(fit=True)
img = qr.make_image(fill_color="black", back_color="white")
return img
def download_qr_code(img): # Convert PIL image to bytes
img_bytes = BytesIO()
img.save(img_bytes, format='PNG')
img_bytes.seek(0)
return img_bytes
#event handler
def text_change(event):
generate_img()
def generate_img():
link = link_text.value
qr_img = generate_qr_code(link)
img = download_qr_code(qr_img)
myimg.image = img
#ui
ss.write("# QR Code Generator")
link_text = ss.text_input("http://www.simplestart.cc", label = "Enter a link:", onchange = text_change, max_width = 600)
myimg = ss.image("", title='Generated QR Code', width=300, border= True)
generate_img()
ss.link("Download QR Code", myimg.image, file_name = "qr_code.png", mime = "image/png")
ss.space()
ss.md('''
---
### Related References:
[Streamlit Re-runs App on Button Click, Delaying Download](https://stackoverflow.com/questions/78045476/streamlit-re-runs-app-on-button-click-delaying-download) (stackoverflow)
[source code of this demo](https://github.com/readever/simplestart/tree/main/demo/stackoverflow/a%20link%20to%20download%20qrcode) (github)
''') |