Add setPauseFor method for late setup

speech_to_text/lib/speech_to_text.dart

@@ -435,6 +435,16 @@ class SpeechToText {
       throw ListenFailedException(e.message, e.details, e.stacktrace);
     }
   }
+  void setPauseFor(Duration pauseFor) {
+    //Setup new pauseFor only if listen is active and pauseFor is different
+    if ((_listenTimer?.isActive ?? false) && (_pauseFor == null || _pauseFor!.compareTo(pauseFor) != 0)) {
+      _listenTimer?.cancel();
+      _listenTimer = null;
+      _setupListenAndPause(pauseFor, _listenFor);
+    } else {
+      throw ListenNotStartedException();
+    }
+  }
 
   void _setupListenAndPause(
       Duration? initialPauseFor, Duration? initialListenFor) {
@@ -658,3 +668,5 @@ class ListenFailedException implements Exception {
   final String? stackTrace;
   ListenFailedException(this.message, [this.details, this.stackTrace]);
 }
+
+class ListenNotStartedException implements Exception {}

speech_to_text/test/speech_to_text_test.dart

@@ -187,6 +187,60 @@ void main() {
         expect(speech.isListening, isTrue);
       });
     });
+    test('trows on setPauseFor when not listening', () async {
+      fakeAsync((fa) {
+        speech.initialize();
+        fa.flushMicrotasks();
+        testPlatform.onStatus!(SpeechToText.notListeningStatus);
+        fa.flushMicrotasks();
+        expect(speech.isListening, isFalse);
+        try {
+          speech.setPauseFor(Duration(seconds: 5));
+          fail('Should have thrown');
+        } on ListenNotStartedException {
+          // This is a good result
+        } catch (wrongE) {
+          fail('Should have been ListenNotStartedException');
+        }
+      });
+    });
+    test('stops listen after late setPauseFor with no speech', () async {
+      fakeAsync((fa) {
+        speech.initialize();
+        fa.flushMicrotasks();
+        speech.listen(pauseFor: Duration(seconds: 2));
+        testPlatform.onStatus!(SpeechToText.listeningStatus);
+        fa.flushMicrotasks();
+        expect(speech.isListening, isTrue);
+        fa.elapse(Duration(seconds: 1));
+        speech.setPauseFor(Duration(seconds: 5));
+        fa.flushMicrotasks();
+        fa.elapse(Duration(seconds: 3));
+        expect(speech.isListening, isTrue);
+        fa.elapse(Duration(seconds: 2));
+        expect(speech.isListening, isFalse);
+      });
+    });
+    test('keeps listening after late setPauseFor with speech event', () async {
+      fakeAsync((fa) {
+        speech.initialize();
+        fa.flushMicrotasks();
+        speech.listen(pauseFor: Duration(seconds: 2));
+        testPlatform.onStatus!(SpeechToText.listeningStatus);
+        fa.flushMicrotasks();
+        fa.elapse(Duration(seconds: 1));
+        expect(speech.isListening, isTrue);
+        speech.setPauseFor(Duration(seconds: 5));
+        fa.flushMicrotasks();
+        fa.elapse(Duration(seconds: 3));
+        expect(speech.isListening, isTrue);
+        testPlatform
+            .onTextRecognition!(TestSpeechChannelHandler.firstRecognizedJson);
+        fa.flushMicrotasks();
+        fa.elapse(Duration(seconds: 3));
+        expect(speech.isListening, isTrue);
+      });
+    });
     test('creates finalResult true if none provided', () async {
       fakeAsync((fa) {
         speech.initialize(finalTimeout: Duration(milliseconds: 100));