我通过创建自己的主自定义布局解决了这个问题。 OverlayCenter 将主小部件作为其父级，您只需将其他布局添加到此布局即可。
import sys
from PySide import QtGui, QtCore
class OverlayCenter(QtGui.QLayout):
"""Layout for managing overlays."""
def __init__(self, parent):
super().__init__(parent)
# Properties
self.setContentsMargins(0, 0, 0, 0)
self.items = []
# end Constructor
def addLayout(self, layout):
"""Add a new layout to overlay on top of the other layouts and widgets."""
self.addChildLayout(layout)
self.addItem(layout)
# end addLayout
def __del__(self):
"""Destructor for garbage collection."""
item = self.takeAt(0)
while item:
item = self.takeAt(0)
# end Destructor
def addItem(self, item):
"""Add an item (widget/layout) to the list."""
self.items.append(item)
# end addItem
def count(self):
"""Return the number of items."""
return len(self.items)
# end Count
def itemAt(self, index):
"""Return the item at the given index."""
if index >= 0 and index < len(self.items):
return self.items[index]
return None
# end itemAt
def takeAt(self, index):
"""Remove and return the item at the given index."""
if index >= 0 and index < len(self.items):
return self.items.pop(index)
return None
# end takeAt
def setGeometry(self, rect):
"""Set the main geometry and the item geometry."""
super().setGeometry(rect)
for item in self.items:
item.setGeometry(rect)
# end setGeometry
# end class OverlayCenter
class Overlay(QtGui.QBoxLayout):
"""Overlay widgets on a parent widget."""
def __init__(self, location="left", parent=None):
super().__init__(QtGui.QBoxLayout.TopToBottom, parent)
if location == "left":
self.setDirection(QtGui.QBoxLayout.TopToBottom)
self.setAlignment(QtCore.Qt.AlignLeft | QtCore.Qt.AlignVCenter)
elif location == "right":
self.setDirection(QtGui.QBoxLayout.TopToBottom)
self.setAlignment(QtCore.Qt.AlignRight | QtCore.Qt.AlignVCenter)
elif location == "top":
self.setDirection(QtGui.QBoxLayout.LeftToRight)
self.setAlignment(QtCore.Qt.AlignTop | QtCore.Qt.AlignHCenter)
elif location == "bottom":
self.setDirection(QtGui.QBoxLayout.LeftToRight)
self.setAlignment(QtCore.Qt.AlignBottom | QtCore.Qt.AlignHCenter)
self.css = "QWidget {background-color: lightskyblue; color: white}"
# end Constructor
def addWidget(self, widget):
super().addWidget(widget)
widget.setStyleSheet(self.css)
# end addWidget
# end class Overlay
def main():
app = QtGui.QApplication(sys.argv)
window = QtGui.QMainWindow()
window.show()
widg = QtGui.QTreeView()
window.setCentralWidget(widg)
left = Overlay("left")
lhlbl = QtGui.QLabel("Hello")
lwlbl = QtGui.QLabel("World!")
lhlbl.setSizePolicy(QtGui.QSizePolicy.Maximum, QtGui.QSizePolicy.Maximum)
lwlbl.setSizePolicy(QtGui.QSizePolicy.Maximum, QtGui.QSizePolicy.Maximum)
left.addWidget(lhlbl)
left.addWidget(lwlbl)
top = Overlay("top")
lhlbl = QtGui.QLabel("HELLO")
lwlbl = QtGui.QLabel("WORLD!")
lhlbl.setSizePolicy(QtGui.QSizePolicy.Maximum, QtGui.QSizePolicy.Maximum)
lwlbl.setSizePolicy(QtGui.QSizePolicy.Maximum, QtGui.QSizePolicy.Maximum)
top.addWidget(lhlbl)
top.addWidget(lwlbl)
right = Overlay("right")
lhlbl = QtGui.QLabel("hellO")
lwlbl = QtGui.QLabel("worlD!")
lhlbl.setSizePolicy(QtGui.QSizePolicy.Maximum, QtGui.QSizePolicy.Maximum)
lwlbl.setSizePolicy(QtGui.QSizePolicy.Maximum, QtGui.QSizePolicy.Maximum)
right.addWidget(lhlbl)
right.addWidget(lwlbl)
bottom = Overlay("bottom")
lhlbl = QtGui.QLabel("hello")
lwlbl = QtGui.QLabel("world!")
lhlbl.setSizePolicy(QtGui.QSizePolicy.Maximum, QtGui.QSizePolicy.Maximum)
lwlbl.setSizePolicy(QtGui.QSizePolicy.Maximum, QtGui.QSizePolicy.Maximum)
bottom.addWidget(lhlbl)
bottom.addWidget(lwlbl)
center = OverlayCenter(widg)
center.addLayout(left)
center.addLayout(top)
center.addLayout(right)
center.addLayout(bottom)
return app.exec_()
# end main
if __name__ == '__main__':
sys.exit(main())
