如何使用pyqtsignal来传输保留其功能的窗口?

Question

我使用pyqt_signal来传输一个子窗口，该子窗口有一个按钮，其功能是打印。我使用一个线程来传输这个子窗口到主窗口来显示，但是按钮失去了它的功能。我知道我应该把语句self.sub_window = SubWindow()放到第二个类的__init__函数中，但是如果我仍然把这条语句放在这里，我怎么能达到同样的效果呢?

# -*- coding: utf-8 -*-
from threading import currentThread
from PyQt5.QtWidgets import QApplication, QWidget, QPushButton
import sys
from PyQt5.QtCore import pyqtSignal, QObject, QThread

class SubWindow(QWidget):
def __init__(self):
super(SubWindow, self).__init__()
self.resize(400, 400)
self.button = QPushButton(self)
self.button.setText('push me to print ***')
self.button.move(200, 200)
self.button.clicked.connect(self.print_)
def print_(self):
print('***')

class SignalStore(QThread):
window_signal = pyqtSignal(object)
def __init__(self):
super(SignalStore, self).__init__()
def run(self):
# if i put this statement here, how can i acquire window's print button function
self.sub_window = SubWindow()
self.window_signal.emit(self.sub_window)

class MainWindow(QWidget):
def __init__(self):
super(MainWindow, self).__init__()
self.resize(400, 400)
self.button = QPushButton(self)
self.button.setText('push me to get subwindow')
self.button.move(200, 200)
self.button.clicked.connect(self.send_signal)
self.med_signal = SignalStore()
self.med_signal.window_signal.connect(self.get_sub_window)
def send_signal(self):
self.med_signal.start()
def get_sub_window(self, para):
self.sub_window = para
self.sub_window.show()

if __name__ == '__main__':
app = QApplication(sys.argv)
win = MainWindow()
win.show()
sys.exit(app.exec_())

Answer 1

不要在线程中创建或访问gui对象。阅读Qt指南

GUI线程和工作者线程如前所述，每个程序在启动时都有一个线程。这个线程称为"主线程"。(也称为"GUI线程")在Qt应用程序中)。Qt GUI必须在这个线程中运行。所有的小部件和一些相关的类，例如QPixmap，都不能在辅助线程中工作。辅助线程通常被称为"工作线程"。因为它用于从主线程卸载处理工作。

这可能就是你要找的:

import time
from PyQt5.QtWidgets import QApplication, QWidget, QPushButton
import sys
from PyQt5.QtCore import pyqtSignal, QThread, pyqtSlot

class SubWindow(QWidget):
def __init__(self, parent=None):
super(SubWindow, self).__init__(parent)
self.resize(400, 400)
self.button = QPushButton(self)
self.button.setText('push me to print ***')
self.button.move(200, 200)
self.button.clicked.connect(self.print_)

@pyqtSlot()
def print_(self):
print('hello from subwindow')

class SignalStore(QThread):
print_func = pyqtSignal(str)
def __init__(self):
super(SignalStore, self).__init__()
def run(self):
time.sleep(1) # fake working...
self.print_func.emit("hello from thread")

class MainWindow(QWidget):
def __init__(self):
super(MainWindow, self).__init__()
self.resize(400, 400)
self.subwin = SubWindow()
self.button = QPushButton(self)
self.button.setText('push me to get subwindow')
self.button.move(200, 200)
self.button.clicked.connect(self.send_signal)
self.med_signal = SignalStore()
self.med_signal.print_func.connect(self.print_from_main)

def send_signal(self):
self.subwin.show()
self.med_signal.start()
@pyqtSlot(str)
def print_from_main(self, string: str):
print(string)
self.subwin.print_()
if __name__ == '__main__':
app = QApplication(sys.argv)
win = MainWindow()
win.show()
sys.exit(app.exec_())