Merge pull request #322 from OpenMS/claude/streamlit-multiselect-ui-d7bm5

Improve list parameter UX with multiselect for valid options

Author: t0mdavid-m

src/workflow/StreamlitUI.py

@@ -864,19 +864,26 @@ def display_TOPP_params(params: dict, num_cols):
                             v.decode() if isinstance(v, bytes) else v
                             for v in p["value"]
                         ]
-                        valid_entries_info = ''
+
+                        # Use multiselect when valid_strings are available for better UX
                         if len(p['valid_strings']) > 0:
-                            valid_entries_info = (
-                                " Valid entries are: "
-                                + ', '.join(sorted(p['valid_strings']))
+                            # Filter current values to only include valid options
+                            current_values = [v for v in p["value"] if v in p['valid_strings']]
+                            cols[i].multiselect(
+                                name,
+                                options=sorted(p['valid_strings']),
+                                default=current_values,
+                                help=p["description"],
+                                key=key,
+                            )
+                        else:
+                            # Fall back to text_area for freeform list input
+                            cols[i].text_area(
+                                name,
+                                value="\n".join([str(val) for val in p["value"]]),
+                                help=p["description"] + " Separate entries using the \"Enter\" key.",
+                                key=key,
                             )
-
-                        cols[i].text_area(
-                            name,
-                            value="\n".join([str(val) for val in p["value"]]),
-                            help=p["description"] + " Separate entries using the \"Enter\" key." + valid_entries_info,
-                            key=key,
-                        )
 
                     # increment number of columns, create new cols object if end of line is reached
                     i += 1