from    PyQt4       import QtGui, QtCore 

class ViewerItem(QtGui.QListWidgetItem):
    def __init__(self, name, parent = None):
        super(ViewerItem, self).__init__(name, parent, QtGui.QListWidgetItem.UserType)

    def toggleVisible(self):
        self.visible = not self.visible
        self.setChecked()

    def setChecked(self):
        if self.visible:
            self.setCheckState(QtCore.Qt.Checked)
        else:
            self.setCheckState(QtCore.Qt.Unchecked)
    
    def contextMenu(self, position):
        pass