pyqt : addStretch()方法的参数的是些什么值？分别有什么表现？
import sys
from PyQt4 import QtGui
class Example(QtGui.QWidget):
def __init__(self):
super(Example, self).__init__()
self.initUI()
def initUI(self):
okButton = QtGui.QPushButton("OK")
cancelButton = QtGui.QPushButton("Cancel")
hbox = QtGui.QHBoxLayout()
hbox.addStretch(1)
hbox.addWidget(okButton)
hbox.addWidget(cancelButton)
vbox = QtGui.QVBoxLayout()
vbox.addStretch(1)
vbox.addLayout(hbox)
self.setLayout(vbox)
self.setGeometry(300, 300, 300, 150)
self.setWindowTitle('Buttons')
self.show()
def main():
app = QtGui.QApplication(sys.argv)
ex = Example()
sys.exit(app.exec_())
if __name__ == '__main__':
main()
这两行代码有什么作用？
hbox.addStretch(1)
vbox.addStretch(1)
另外，可作为这个addStretch()方法的参数的是些什么值？分别有什么表现？
[解决办法]
QBoxLayout.addStretch (self, int stretch = 0)
Adds a stretchable space (a QSpacerItem) with zero minimum size and stretch factor stretch to the end of this box layout.
See also insertStretch(), addItem(), and QSpacerItem.
