app.py

import gradio as gr

from utils import duckdb_queries as dq
from utils.gradio import get_window_url_params
from utils.indicators import IndexGenerator

# Instantiate outside gradio app to avoid re-initializing GEE, which is slow
indexgenerator = IndexGenerator(indices=["NDWI", "Water", "Protected", "Habitat"])

with gr.Blocks() as demo:
 with gr.Column():
 m1 = gr.Plot()
 with gr.Row():
 project_name = gr.Dropdown([], label="Project", value="Select project")
 start_year = gr.Number(value=2017, label="Start Year", precision=0)
 end_year = gr.Number(value=2022, label="End Year", precision=0)
 with gr.Row():
 view_btn = gr.Button(value="Show project map")
 calc_btn = gr.Button(value="Calculate!")
 # save_btn = gr.Button(value="Save")
 results_df = gr.Dataframe(
 headers=["Year", "Project Name", "Score"],
 datatype=["number", "str", "number"],
 label="Biodiversity scores by year",
 )
 calc_btn.click(
 indexgenerator.calculate_biodiversity_score,
 inputs=[start_year, end_year, project_name],
 outputs=results_df,
 )
 view_btn.click(
 fn=indexgenerator.show_project_map,
 inputs=[project_name],
 outputs=[m1],
 )

 def update_project_dropdown_list(url_params):
 username = url_params.get("username", "default")
 projects = dq.list_projects_by_author(author_id=username)
 return gr.Dropdown.update(choices=projects["name"].tolist())

 # Get url params
 url_params = gr.JSON({"username": "default"}, visible=False, label="URL Params")

 # Gradio has a bug
 # For dropdown to update by demo.load, dropdown value must be called downstream
 b1 = gr.Button("Hidden button that fixes bug.", visible=False)
 b1.click(lambda x: x, inputs=project_name, outputs=[])

 # Update project dropdown list on page load
 demo.load(
 fn=update_project_dropdown_list,
 inputs=[url_params],
 outputs=[project_name],
 _js=get_window_url_params,
 queue=False,
 )

demo.launch()