enabled-disable play last while generating

query.py

@@ -192,7 +192,7 @@ def chat(message, history, state, request:gr.Request):
             answer = ''
             for response in llm.stream(messages):
                 answer += response.content
-                yield answer
+                yield answer+'…'
         else:
             add_history(state, request, "user", message)
 
@@ -200,8 +200,9 @@ def chat(message, history, state, request:gr.Request):
             answer = ' '
             for word in msg.split():
                 answer += f' {word}'
-                yield answer
+                yield answer+'…'
                 time.sleep(0.05)
+        yield answer    
 
         add_history(state, request, "ai", answer)
 
@@ -234,6 +235,15 @@ def play_last(history, state):
             response = lab11.generate(text=text, voice=whatson, stream=True)
             yield from response
 
+
+def chat_chage(history):
+    if history:
+        if not history[-1][1]:
+            return gr.update(interactive=False)
+        elif history[-1][1][-1] != '…':
+            return gr.update(interactive=True)
+    return gr.update()
+
 TEXT_TALK = "🎤 Talk"
 TEXT_STOP = "⏹ Stop"
 
@@ -296,12 +306,13 @@ def gr_main():
                     waveform_options=gr.WaveformOptions(sample_rate=16000, show_recording_waveform=False))
                 
                 start_stop_rec = gr.Button(TEXT_TALK, size = "lg")
-                play_btn  = gr.Button("🔊 Play last", size = "lg", interactive=True)
+                play_last_btn  = gr.Button("🔊 Play last", size = "lg", interactive=False)
 
-                play_btn.click(
+                play_last_btn.click(
                     play_last,
                     [chatbot, state], player)
 
+            chatbot.change(chat_chage, inputs=chatbot, outputs=play_last_btn)
             start_stop_rec.click(
                 lambda x:x,
                 inputs=start_stop_rec,