python - PyQt : How to set a mask over a QWidget to ignore mouse events but get the children events

Question

我想要重叠小部件并使它们全部发挥作用，但我无法通过简单的布局管理来完成此任务。我找到了一个在小部件上应用掩码的示例，但它是用 C++ 编写的，我很难尝试将其移植到 python。

示例在本文中:

• How to disable the delivery of mouse events to the widget but not its children in Qt?

这正是我所需要的，我正在尝试在我的代码中实现它。但我收到错误:

NotImplementedError: reverse operator not implemented

我该如何解决这个问题？

我在代码中所做的一个非常简单的示例:

from PySide import QtCore as qc
from PySide import QtGui as qg
import operator
###############################################################
class WinDin(qg.QDialog):
    def __init__(self):
        super(WinDin, self).__init__()
        self.setLayout(qg.QVBoxLayout())
        self.setFixedSize(500,500)

        button_00 = qg.QPushButton('death')
        self.layout().addWidget(button_00)

        ##################################################
        # IM USING A QLABEL FOR EASY LOOK THROUGH ...
        #
        self._mainWidget = qg.QLabel(self)
        self._mainWidget.setFixedSize(500,500)
        self._mainWidget.setStyleSheet("background-color: rgba(255,0,0,5)")

        lay_out = qg.QHBoxLayout(self._mainWidget)
        button_01 = qg.QPushButton('trick')

        lay_out.setAlignment(qc.Qt.AlignBottom)
        lay_out.addWidget(button_01)

        self.settingMask()
    ############################################################################################################################################
    def settingMask(self):
        ### SAW THIS EXAMPLE IN OTHER FORO IN C++

        frame_geometry = self._mainWidget.frameGeometry()
        wd_geo = self._mainWidget.geometry()
        child_reg = self._mainWidget.childrenRegion()


        ##############################
        # TESTING WITH OPERATOR MODULE I GET AND ERRROR . 'PySide.QtCore.QRect' is not iterable
        #
        #this = operator.__contains__(wd_geo,wd_geo)
        #self._mainWidget.setMask(this)

        self._mainWidget.setMask(frame_geometry - child_reg)

        ###
        ###
        ###  THIS WAY I GET : NotImplementedError: reverse operator not implemented.

##########################################
def main():
    import sys
    qtApp=qg.QApplication(sys.argv)
    myWinPos=WinDin()
    myWinPos.show()
    sys.exit(qtApp.exec_())

if __name__=="__main__":
    main()

如何从父几何体中减去子几何体并使其正常工作？

Answer 1

您需要使用 QRegion 类才能使其正常工作:

def settingMask(self):
    region = qg.QRegion(self._mainWidget.frameGeometry())
    region -= qg.QRegion(self._mainWidget.geometry())
    region += self._mainWidget.childrenRegion()
    self._mainWidget.setMask(region)

此外，在我的系统 (Linux) 上，我发现我必须在窗口显示后调用此函数:

def main():
    ...
    myWinPos.show()
    myWinPos.settingMask()
    sys.exit(qtApp.exec_())