多亏了armatita，我才能得到想要的东西。目前，存在一些问题，但是它可以工作，并且我得到了想要的结果。
我将代码提供给下一个将要寻找相同内容的人。
from PySide import QtCore, QtGuiimport sysclass CtmWidget(QtGui.QWidget): def __init__(self, parent = None): QtGui.QWidget.__init__(self, parent) self.button = QtGui.QPushButton("Close Overlay") self.setLayout(QtGui.QHBoxLayout()) self.layout().addWidget(self.button) self.button.clicked.connect(self.hideOverlay) def paintEvent(self, event): painter = QtGui.QPainter() painter.begin(self) painter.setRenderHint(QtGui.QPainter.Antialiasing) path = QtGui.QPainterPath() path.addRoundedRect(QtCore.QRectF(self.rect()), 10, 10) mask = QtGui.QRegion(path.toFillPolygon().toPolygon()) pen = QtGui.QPen(QtCore.Qt.white, 1) painter.setPen(pen) painter.fillPath(path, QtCore.Qt.white) painter.drawPath(path) painter.end() def hideOverlay(self): self.parent().hide()class Overlay(QtGui.QWidget): def __init__(self, parent, widget): QtGui.QWidget.__init__(self, parent) palette = QtGui.QPalette(self.palette()) palette.setColor(palette.Background, QtCore.Qt.transparent) self.setPalette(palette) self.widget = widget self.widget.setParent(self) def paintEvent(self, event): painter = QtGui.QPainter() painter.begin(self) painter.setRenderHint(QtGui.QPainter.Antialiasing) painter.fillRect(event.rect(), QtGui.QBrush(QtGui.QColor(0, 0, 0, 127))) painter.end() def resizeEvent(self, event): position_x = (self.frameGeometry().width()-self.widget.frameGeometry().width())/2 position_y = (self.frameGeometry().height()-self.widget.frameGeometry().height())/2 self.widget.move(position_x, position_y) event.accept()class MainWindow(QtGui.QWidget): def __init__(self): QtGui.QWidget.__init__(self) self.resize(800, 500) self.button = QtGui.QPushButton("Click Me") self.setLayout(QtGui.QVBoxLayout()) self.layout().addWidget(self.button) self.popup = Overlay(self, CtmWidget()) self.popup.hide() # Connections self.button.clicked.connect(self.displayOverlay) def displayOverlay(self): self.popup.show() print "clicked" def resizeEvent(self, event): self.popup.resize(event.size()) event.accept()if __name__ == "__main__": app = QtGui.QApplication(sys.argv) window = MainWindow() window.show() sys.exit(app.exec_())再次感谢你们（ymmx和armatita），花时间在我的问题上。
