QStackedLayout 显示空 window 片刻

Question

在此示例中，作为主要 window，我使用包含 QStackedLayout 和 QPushButton 的 QWidget 将当前小部件更改为 QStackedLayout.

from PySide6.QtWidgets import QFrame, QWidget, QApplication, QVBoxLayout, QStackedLayout, QPushButton
from PySide6.QtCore import Qt


class ColorWidget(QFrame):
    def __init__(self, color):
        super(ColorWidget, self).__init__()
        self.setFixedSize(200, 200)
        self.setStyleSheet(f"background-color: {color}; border-radius: 6px;")
        # Some widget. In this case, just a colored background.


class MainWidget(QWidget):
    def __init__(self):
        super(MainWidget, self).__init__()
        self.current_widget = False

        layout = QStackedLayout()
        layout.addWidget(ColorWidget("red"))
        layout.addWidget(ColorWidget("yellow"))
        layout.setCurrentIndex(0)

        self.setLayout(layout)
        # Main widget. Contains 2 colored widgets.

    def change_visible_widget(self):
        self.current_widget = not self.current_widget
        self.layout().setCurrentIndex(int(self.current_widget))


class MainWindow(QWidget):
    def __init__(self):
        super(MainWindow, self).__init__()
        self.setWindowFlag(Qt.FramelessWindowHint)
        self.setAttribute(Qt.WA_TranslucentBackground)
        # no frame, no background

        layout = QVBoxLayout()

        main_widget = MainWidget()
        button = QPushButton("change")
        button.clicked.connect(main_widget.change_visible_widget)
        # button to change QStackedLayout index in Main Widget

        layout.addWidget(main_widget)
        layout.addWidget(button)
        self.setLayout(layout)


if __name__ == '__main__':
    app = QApplication()
    win = MainWindow()
    win.show()
    app.exec()

问题是程序启动时，会出现片刻的空白window。

通过反复试验，我意识到这是因为 QStackedLayout 并且出现的 windows 的数量等于创建的 QStackedLayout 的数量（在这种情况下它是 1).

如何解决这个问题？

Answer 1

只需将 self 添加到 layout = QStackedLayout():

from PySide6.QtWidgets import QFrame, QWidget, QApplication, QVBoxLayout, QStackedLayout, QPushButton
from PySide6.QtCore import Qt


class ColorWidget(QFrame):
    def __init__(self, color):
        super(ColorWidget, self).__init__()
        self.setFixedSize(200, 200)
        
        self.setStyleSheet(f"background-color: {color}; border-radius: 6px;")
        # Some widget. In this case, just a colored background.


class MainWidget(QWidget):
    def __init__(self):
        super(MainWidget, self).__init__()
        self.current_widget = False

        layout = QStackedLayout(self)
        layout.addWidget(ColorWidget("red"))
        layout.addWidget(ColorWidget("yellow"))
        layout.setCurrentIndex(0)
        
        # Main widget. Contains 2 colored widgets.

    def change_visible_widget(self):
        self.current_widget = not self.current_widget
        self.layout().setCurrentIndex(int(self.current_widget))


class MainWindow(QWidget):
    def __init__(self):
        super(MainWindow, self).__init__()
        self.setWindowFlag(Qt.FramelessWindowHint)
        self.setAttribute(Qt.WA_TranslucentBackground)
        # no frame, no background

        layout = QVBoxLayout()
        main_widget = MainWidget()
        button = QPushButton("change")
        button.clicked.connect(main_widget.change_visible_widget)
        # button to change QStackedLayout index in Main Widget

        layout.addWidget(main_widget)
        layout.addWidget(button)
        self.setLayout(layout)


if __name__ == '__main__':
    app = QApplication()
    win = MainWindow()
    win.show()
    app.exec()

QStackedLayout 显示空 window 片刻

QStackedLayout shows empty window for a few moments

python

pyqt

pyside

pyside6

pyqt6