python - PyQt5点击button如何弹出新窗口？

Question

怎么通过点击button，来打开一个新的窗口？是写在同一个脚本里，还是把新窗口的代码放在另一个脚本里，然后通过点击按钮来运行？ {代码...}

ringa_lee · Answer

代码量不大的话，放一个文件就行了，要是代码比较多的话，考虑到维护的方便，还是放在2个里面比较好，这种事件的触发和界面切换一般都是用signal-slot做的，使得语义看起来非常清晰

# -*- coding: utf-8 -*-

import sys
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *


class FirstWindow(QWidget):

    close_signal = pyqtSignal()
    def __init__(self, parent=None):
        # super这个用法是调用父类的构造函数
        # parent=None表示默认没有父Widget，如果指定父亲Widget，则调用之
        super(FirstWindow, self).__init__(parent)
        self.resize(100, 100)
        self.btn = QToolButton(self)
        self.btn.setText("click")

    def closeEvent(self, event):
        self.close_signal.emit()
        self.close()


class SecondWindow(QWidget):
    def __init__(self, parent=None):
        super(SecondWindow, self).__init__(parent)
        self.resize(200, 200)
        self.setStyleSheet("background: black")

    def handle_click(self):
        if not self.isVisible():
            self.show()

    def handle_close(self):
        self.close()


if __name__ == "__main__":
    App = QApplication(sys.argv)
    ex = FirstWindow()
    s = SecondWindow()
    ex.btn.clicked.connect(s.handle_click)
    ex.btn.clicked.connect(ex.hide)
    ex.close_signal.connect(ex.close)
    ex.show()
    sys.exit(App.exec_())

巴扎黑 · Answer

-- coding: utf-8 --

import sys
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *

class FirstWindow(QWidget):

close_signal = pyqtSignal()
def __init__(self, parent=None):
    # super这个用法是调用父类的构造函数,parent=None表示默认没有父Widget,如果有则调用之
    super(FirstWindow, self).__init__(parent)
    self.resize(800, 600)
    self.setMaximumSize(QSize(800, 600))
    self.btn = QToolButton(self)
    self.btn.setText("click")
    self.two = SecondWindow()
    self.btn.clicked.connect(self.two.handle_click)
    #self.btn.clicked.connect(self.hide)
    self.close_signal.connect(self.closeSlot)
    print("FirstWindow")

def closeEvent(self, event):
    print("close signal emit by FirstWindow")
    self.close_signal.emit()
    #self.close()

def closeSlot(self):
    print("close signal slot to SecondWindow")
    self.two.close()

class SecondWindow(QWidget):

close_signal = pyqtSignal()
def __init__(self, parent=None):
    super(SecondWindow, self).__init__(parent)
    self.resize(800, 600)
    self.setMaximumSize(QSize(800, 600))
    self.setStyleSheet("background: black")
    self.close_signal.connect(self.closeSlot)
    
def handle_click(self):
    if not self.isVisible():
        self.show()
        print("SecondWindow")

def closeEvent(self, event):
    print("close signal emit by SecondWindow")
    self.close_signal.emit()
    #self.close()

def closeSlot(self):
    print("close signal slot to FirstWindow")
    one.close()

if name == "__main__":

App = QApplication(sys.argv)
one = FirstWindow()
one.show()
sys.exit(App.exec_())