Refactor player selection handling in Handbuilder tab of app.py to improve session state management and enhance user experience by separating lineup display and player selection editor.

app.py

@@ -802,16 +802,12 @@ with tab3:
 with tab4:
     st.header("Handbuilder")
 
-    # Prepare the player selection DataFrame
-    player_select_df = dk_roo[['Player', 'Position', 'Team', 'Salary', 'Median', 'Ceiling', 'Own%']].copy()
-    player_select_df['Select'] = False  # Add a checkbox column
-
-    # Use session state to persist selections
+    # Only initialize once
     if 'handbuilder_select' not in st.session_state:
-        st.session_state.handbuilder_select = player_select_df
+        st.session_state.handbuilder_select = dk_roo[['Player', 'Position', 'Team', 'Salary', 'Median', 'Ceiling', 'Own%']].copy()
+        st.session_state.handbuilder_select['Select'] = False
 
-    # Data editor for player selection
-    st.subheader("Player Select")
+    # Use the session state DataFrame as the source
     edited_df = st.data_editor(
         st.session_state.handbuilder_select,
         column_config={
@@ -826,16 +822,33 @@ with tab4:
         key="handbuilder_editor"
     )
 
-    # Update session state with the edited DataFrame
-    st.session_state.handbuilder_select = edited_df
+    # Update session state only if there are changes
+    if not edited_df.equals(st.session_state.handbuilder_select):
+        st.session_state.handbuilder_select = edited_df
 
     # Filter selected players for the lineup
-    selected_players = edited_df[edited_df['Select'] == True]
-
-    # Display the selected lineup
-    st.subheader("Lineup")
-    st.dataframe(
-        selected_players.drop(columns=['Select']),
-        use_container_width=True,
-        height=500
-    )
+    selected_players = st.session_state.handbuilder_select[st.session_state.handbuilder_select['Select'] == True]
+
+    col1, col2 = st.columns([1, 2])
+    with col1:
+        st.subheader("Lineup")
+        st.dataframe(
+            selected_players.drop(columns=['Select']),
+            use_container_width=True,
+            height=500
+        )
+    with col2:
+        st.subheader("Player Select")
+        st.data_editor(
+            st.session_state.handbuilder_select,
+            column_config={
+                "Select": st.column_config.CheckboxColumn(
+                    "Select",
+                    help="Check to add player to lineup",
+                    default=False
+                )
+            },
+            use_container_width=True,
+            hide_index=True,
+            key="handbuilder_editor_view"
+        )