Update app.py

app.py

@@ -35,10 +35,9 @@ app.layout = dbc.Container([
                 multiple=False
             ),
             dbc.Input(id="url-input", placeholder="Or enter PDF URL", type="text", className="mt-3"),
-            dbc.Button("Compress", id="compress-btn", color="primary", className="mt-3"),
+            dbc.Button("Compress PDF", id="compress-btn", color="primary", className="mt-3"),
             dbc.Spinner(html.Div(id="compression-status"), color="primary", type="grow", spinner_class_name="mt-3"),
             dcc.Download(id="download-pdf"),
-            dbc.Button("Download Compressed PDF", id="download-btn", color="success", className="mt-3", disabled=True),
         ])
     ]),
 ])
@@ -85,45 +84,31 @@ def compress_pdf(input_file, url):
 
 @callback(
     Output("compression-status", "children"),
-    Output("download-btn", "disabled"),
     Output("download-pdf", "data"),
     Input("compress-btn", "n_clicks"),
-    Input("download-btn", "n_clicks"),
     State("upload-pdf", "contents"),
     State("url-input", "value"),
     prevent_initial_call=True
 )
-def process_and_compress(compress_clicks, download_clicks, file_content, url):
-    ctx = dash.callback_context
-    if not ctx.triggered:
-        raise PreventUpdate
-
-    triggered_id = ctx.triggered[0]['prop_id'].split('.')[0]
-
-    if triggered_id == "compress-btn":
-        if file_content is None and (url is None or url.strip() == ""):
-            return "Please provide either a file or a URL.", True, None
-
-        def compression_thread():
-            nonlocal file_content, url
-            output_file, message = compress_pdf(file_content, url)
-            if output_file:
-                with open(output_file, "rb") as file:
-                    compressed_content = file.read()
-                os.remove(output_file)
-                return message, False, dcc.send_bytes(compressed_content, "compressed.pdf")
-            else:
-                return message, True, None
-
-        thread = threading.Thread(target=compression_thread)
-        thread.start()
-        thread.join()
-        return compression_thread()
-
-    elif triggered_id == "download-btn":
-        raise PreventUpdate
+def process_compress_and_download(n_clicks, file_content, url):
+    if file_content is None and (url is None or url.strip() == ""):
+        return "Please provide either a file or a URL.", None
+
+    def compression_thread():
+        nonlocal file_content, url
+        output_file, message = compress_pdf(file_content, url)
+        if output_file:
+            with open(output_file, "rb") as file:
+                compressed_content = file.read()
+            os.remove(output_file)
+            return message, dcc.send_bytes(compressed_content, "compressed.pdf")
+        else:
+            return message, None
 
-    raise PreventUpdate
+    thread = threading.Thread(target=compression_thread)
+    thread.start()
+    thread.join()
+    return compression_thread()
 
 if __name__ == '__main__':
     print("Starting the Dash application...")