当次要 Window 关闭时刷新主要 Window PyQt5

Question

在 PyQt5 中，我有一个 window 从数据库读取信息并将该信息添加到小部件。还有第二个 window，打开后会向数据库添加一个新的 table。我想要做的是在次 window 关闭时重新加载主 window。我不想将辅助 window 更改为 QDialoge，需要使用 .show()，而不是 .exec_()。有什么办法可以做到这一点。

有我的代码：

import sys
import sqlite3
from PyQt5.QtWidgets import QApplication, QLabel, QMainWindow, QPushButton, QListWidget, QVBoxLayout, QWidget
from PyQt5.QtCore import Qt

class SecondWindow(QMainWindow):

    def __init__(self, *args, **kwargs):
        super(SecondWindow, self).__init__(*args, **kwargs)

        self.setWindowTitle("App 2")

        label = QLabel("INSERTED VALUES")

        label.setAlignment(Qt.AlignCenter)
        
        self.setCentralWidget(label)

        #Open Database
        self.conn = sqlite3.connect("connections.db")
        self.cursor = self.conn.cursor()

        #Add New Table To Database
        self.cursor.execute('''CREATE TABLE `New`
                     (name text, GD text)''')

        self.conn.commit()
        self.conn.close()

class MainWindow(QMainWindow):

    def __init__(self, *args, **kwargs):
        super(MainWindow, self).__init__(*args, **kwargs)

        self.setWindowTitle("App")
        
        self.list = QListWidget()

        self.cursorCount = 0

        #Open Database
        self.conn = sqlite3.connect("connections.db")
        self.cursor = self.conn.cursor()

        try:
            #Try To Create A Table If It Doesn't exit
            self.cursor.execute('''CREATE TABLE `Default`
                     (name text, GD text)''')
        except:
            pass

        #Get A List Of All The Tables
        self.cursor.execute('SELECT name FROM sqlite_master WHERE type= "table"')

        for table in self.cursor.fetchall():
            self.list.insertItem(self.cursorCount, table[0])
            self.cursorCount += 1

        self.conn.commit()
        self.conn.close()

        self.list.item(0).setSelected(True)
        

        self.btn = QPushButton()
        self.btn.setText("click me!")
        self.btn.clicked.connect(self.openWin)

        winWidget = QWidget()
        self.setCentralWidget(winWidget)

        layout = QVBoxLayout()
        layout.addWidget(self.list)
        layout.addWidget(self.btn)

        winWidget.setLayout(layout)

    def openWin(self):
        self.win = SecondWindow()
        self.win.show()


app = QApplication(sys.argv)

window = MainWindow()
window.show()

app.exec_()

如有任何帮助，我们将不胜感激

Answer 1

我不确定我是否正确解决了您的问题，但我认为您可以使用来自 PyQt5 的信号和 closeEvent 方法。基本上，您应该在第二个 window 中创建一个信号，该信号将在关闭事件发生时发出，并将该信号连接到第一个 window.

中的插槽

导入：

from PyQt5.QtCore import pyqtSignal

在声明第二个 window class 时，在 init 之前，声明你的信号：

class SecondWindow(QMainWindow):
    window_closed = pyqtSignal()

创建一个名为 closeEvent 的方法，当您关闭 window 时将调用该方法，当它发生时它应该发出您之前声明的信号：

def closeEvent(self, event):
    self.window_closed.emit()
    event.accept()
    # event.ignore() # if you want the window to never be closed

并修改 MainWindow openWin 方法，将第二个 window 的信号连接到您要调用的方法：

def openWin(self):
    self.win = SecondWindow()
    self.win.window_closed.connect(self.do_something)
    self.win.show()

def do_something(self):
    print("You closed the second window!")

编辑：

整个代码应该是这样的（我自己去掉了测试相关的parts数据库，貌似没问题）

import sys
from PyQt5.QtWidgets import QApplication, QLabel, QMainWindow, QPushButton, QListWidget, QVBoxLayout, QWidget
from PyQt5.QtCore import Qt, pyqtSignal

class SecondWindow(QMainWindow):

    window_closed = pyqtSignal()

    def __init__(self, *args, **kwargs):
        super(SecondWindow, self).__init__(*args, **kwargs)
        self.setWindowTitle("App 2")
        label = QLabel("INSERTED VALUES")
        label.setAlignment(Qt.AlignCenter)
        self.setCentralWidget(label)

    def closeEvent(self, event):
        self.window_closed.emit()
        event.accept()
        # event.ignore() # if you want the window to never be closed

class MainWindow(QMainWindow):

    def __init__(self, *args, **kwargs):
        super(MainWindow, self).__init__(*args, **kwargs)
        self.setWindowTitle("App")
        self.btn = QPushButton()
        self.btn.setText("click me!")
        self.btn.clicked.connect(self.openWin)
        winWidget = QWidget()
        self.setCentralWidget(winWidget)
        layout = QVBoxLayout()
        layout.addWidget(self.btn)
        winWidget.setLayout(layout)

    def openWin(self):
        self.win = SecondWindow()
        self.win.window_closed.connect(self.do_something)
        self.win.show()

    def do_something(self):
        print("You closed the second window!")

app = QApplication(sys.argv)
window = MainWindow()
window.show()
app.exec_()

当次要 Window 关闭时刷新主要 Window PyQt5

Refresh Main Window When Secondary Window Is Closed PyQt5

python

qt

pyqt

python-3.x

pyqt5