使用layout布局后，怎么获取布局后的某一个控件的尺寸等信息？ [复制链接]

import sys
try:
    from PyQt4 import QtCore, QtGui
except ImportError:
    from PySide import QtCore, QtGui
class Widget(QtGui.QWidget):
    def __init__(self, parent=None):
        super(Widget, self).__init__(parent)
        self.setWindowFlags(QtCore.Qt.FramelessWindowHint)
        self.setGeometry(0, 0, 600, 800)
        
        self.labelLeft = QtGui.QLabel("this is the left!", self)
        self.labelRight = QtGui.QLabel("this is the right one", self)
        
        layout = QtGui.QHBoxLayout()
        layout.setContentsMargins(10, 10, 10, 10)
        layout.addWidget(self.labelLeft)
        layout.addWidget(self.labelRight)
        self.setLayout(layout)
        QtCore.QTimer.singleShot(0, self.afterLayout)
        
    def afterLayout(self):
        print self.labelLeft.geometry().width()
        print self.labelRight.geometry().width()
        
    def mouseDoubleClickEvent(self, evt):
        self.close()
app = QtGui.QApplication(sys.argv)
w = Widget()
w.show()
sys.exit(app.exec_())