toggle QMainWindow WindowStaysOnTopHint flag pyside

Question

为什么当我将QMainWindow的SetWindowFlags切换到WindowStaysOnTopHint时，我的窗口会消失，更重要的是不会停留在顶部？我正在使用PySide和QMainWindow。

import sys
from PySide import QtGui, QtCore
class Browser(QtGui.QMainWindow):
    def __init__(self, parent=None):
        super(Browser, self).__init__(parent)
        self.resize(200, 150)
        self.setWindowTitle('Assets')
        self.initUI()
    def initUI(self):
        self.mi_stay_on_top = QtGui.QAction('Stay On Top', self)
        self.mi_stay_on_top.setShortcut('Ctrl+T')
        self.mi_stay_on_top.setCheckable(True)
        self.mi_stay_on_top.triggered.connect(self.toggle_stay_on_top)
        menubar = self.menuBar()
        fileMenu = menubar.addMenu('&File')
        fileMenu.addAction(self.mi_stay_on_top)
        grid = QtGui.QVBoxLayout()
        grid.setContentsMargins(10,10,10,10)
        self.setLayout(grid)
    def toggle_stay_on_top(self):
        if self.mi_stay_on_top.isChecked():
            # enabled
            self.setWindowFlags(self.windowFlags() | QtCore.Qt.WindowStaysOnTopHint)
        else:
            # disable
            self.setWindowFlags(self.windowFlags() & ~QtCore.Qt.WindowStaysOnTopHint)

def main():
    app = QtGui.QApplication(sys.argv)
    ex = Browser()
    ex.show()
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()

Answer 1

setWindowFlags 方法重置父项，从而隐藏窗口。

所以你需要这样做：

def toggle_stay_on_top(self):
    if self.mi_stay_on_top.isChecked():
        # enabled
        self.setWindowFlags(self.windowFlags() | QtCore.Qt.WindowStaysOnTopHint)
    else:
        # disable
        self.setWindowFlags(self.windowFlags() & ~QtCore.Qt.WindowStaysOnTopHint)
    # re-show the window after changing flags
    self.show()