如何在PyQt5中销毁和重新创建窗口？

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如何在PyQt5中销毁和重新创建窗口？

我正在练习多文件编程，并正在实现一个简单的扫雷游戏。当用户开始新游戏时，我会在窗口主体创建一个QPushButtons的网格。

问题在于，每当玩家想要开始新的扫雷游戏时，我不知道如何调整窗口大小和重置我的QPushButtons网格，以便可以玩新的扫雷游戏。我的初始方法是使用以下代码销毁原始窗口并创建全新的窗口：

def newEasyGame(self):
app = QApplication([])
window = minesweeperWindow(10, 10, "easy")
window.show()
app.exec()

我收到错误信息：QCoreApplication::exec：事件循环已在运行中。

编辑：根据要求，以下是一个更完整的代码块，更详细地描述了我正在尝试做的事情：

from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *
class minesweeperDemoWindow(QMainWindow):    
    def __init__(self, rows, cols, difficulty):
        super(minesweeperDemoWindow, self).__init__()
        #Central widget that is everything is contained within
        widget = QWidget()
        self.setCentralWidget(widget)
        #Vertical layout with a grid of buttons inside of it
        layout = QVBoxLayout()
        widget.setLayout(layout)
        #create a grid of QPushButtons that act as the playing field
        self.playingField = [[0 for x in range(rows)] for y in range(cols)] 
        grid = QGridLayout()
        #for every row and column, add a button
        for r in range(0, rows):
            for c in range(0, cols):
                button = QPushButton()
                button.setFixedSize(30, 30)
                #keep track of each button's position with myRow and myCol
                button.setProperty("myRow", r)
                button.setProperty("myCol", c)
                button.clicked.connect(self.buttonClicked)
                self.playingField[r][c] = button
                grid.addWidget(self.playingField[r][c], r, c)
        layout.addLayout(grid)
        grid.setSpacing(0)
        #How a user is going to start a new game
        menu = self.menuBar().addMenu("&Start new Game")
        newEasy = QAction("Easy", self, shortcut=QKeySequence.New, triggered=self.newEasyGame)
    #when the Easy menu item is selected, destroy the window and create a new easy game
    def newEasyGame(self):
        app = QApplication([])
        window = minesweeperWindow(10, 10, "easy")
        window.show()
        app.exec_()

admin 更改状态以发布 2023年5月21日
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1 答案

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你不必摧毁窗口。在这种情况下，可能的解决方案是消除包含QGridLayout的小部件。为此，必须创建一个方法，如果需要，实现销毁逻辑和创建按钮。\n

from PyQt5 import QtCore, QtGui, QtWidgets
class MinesweeperDemoWindow(QtWidgets.QMainWindow):
    def __init__(self, parent=None):
        super(MinesweeperDemoWindow, self).__init__(parent)
        levels = [
            (4, 4, "level1"),
            (8, 8, "level2"),
            (16, 16, "level3"),
            (32, 32, "level4"),
        ]
        menu = self.menuBar().addMenu("&Start new Game")
        for r, c, name in levels:
            action = menu.addAction(name)
            action.setData((r, c))
            action.triggered.connect(self.on_triggered)
        r, c, _ = levels[0]
        self.setSize(r, c)
    @QtCore.pyqtSlot()
    def on_triggered(self):
        action = self.sender()
        r, c = action.data()
        self.setSize(r, c)
    def setSize(self, rows, cols):
        # delete the old container
        widget = self.centralWidget()
        if widget is not None:
            widget.deleteLater()
        # create new container
        widget = QtWidgets.QWidget()
        self.setCentralWidget(widget)
        grid = QtWidgets.QGridLayout(widget)
        self.playingField = [[0 for x in range(rows)] for y in range(cols)]
        for r in range(rows):
            for c in range(cols):
                button = QtWidgets.QPushButton()
                button.setFixedSize(30, 30)
                # keep track of each button's position with myRow and myCol
                button.setProperty("myRow", r)
                button.setProperty("myCol", c)
                # button.clicked.connect(self.buttonClicked)
                self.playingField[r][c] = button
                grid.addWidget(button, r, c)
        self.setFixedSize(widget.sizeHint())
    @QtCore.pyqtSlot()
    def buttonClicked(self):
        pass
if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    w = MinesweeperDemoWindow()
    w.setSize(4, 4)
    w.show()
    sys.exit(app.exec_())

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