It is not necessary to make offline_speak() a method of the class, but this task can be very time consuming so it can block the mainloop generated by Qt, so it is advisable to execute it in a second thread as I show with the help of QRunnable and QThreadPool
import pyttsx
from PyQt4.QtGui import *
from PyQt4.QtCore import *
class SpeechRunnable(QRunnable):
def __init__(self):
QRunnable.__init__(self)
def run(self):
self.engine = pyttsx.init()
self.engine.say(self.chat_speech)
self.engine.runAndWait()
def say(self, text):
self.chat_speech = text
QThreadPool.globalInstance().start(self)
def stop(self):
self.engine.stop()
class Window(QWidget):
def __init__(self):
super(Window, self).__init__()
self.runnable = None
self.setWindowTitle("Chatbot 0.3")
lay = QVBoxLayout(self)
self.le = QLineEdit(text, self)
self.btnStart = QPushButton("start", self)
self.btnStop = QPushButton("stop", self)
self.btnStart.clicked.connect(self.onClickedStart)
lay.addWidget(self.le)
lay.addWidget(self.btnStart)
lay.addWidget(self.btnStop)
def onClickedStart(self):
self.runnable = SpeechRunnable()
self.runnable.say(self.le.text())
self.btnStop.clicked.connect(self.runnable.stop)
def closeEvent(self, event):
if self.runnable is not None:
self.runnable.stop()
QThread.msleep(100) #delay
super(Window, self).closeEvent(event)
text = """
What is Lorem Ipsum?
Lorem Ipsum is simply dummy text of the printing and typesetting industry.
Lorem Ipsum has been the industry's standard dummy text ever since the 1500s,
when an unknown printer took a galley of type and scrambled it to make a type specimen book.
It has survived not only five centuries, but also the leap into electronic typesetting,
remaining essentially unchanged.
It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages,
and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.
"""
if __name__ == "__main__":
import sys
app = QApplication(sys.argv)
w = Window()
w.show()
sys.exit(app.exec_())
