实现此目的的一种方法是为maximumWidth
窗口和文本编辑上的属性设置动画。
主要的困难在于以一种与标准布局很好地配合,同时还允许调整窗口大小的方式来完成它。在动画期间避免闪烁也相当棘手。
下面的demo就差不多了(动画开头和结尾有点生涩):
from PyQt4 import QtGui, QtCore
class Window(QtGui.QDialog):
def __init__(self):
QtGui.QDialog.__init__(self)
self._offset = 200
self._closed = False
self._maxwidth = self.maximumWidth()
self.widget = QtGui.QWidget(self)
self.listbox = QtGui.QListWidget(self.widget)
self.button = QtGui.QPushButton('Slide', self.widget)
self.button.clicked.connect(self.handleButton)
self.editor = QtGui.QTextEdit(self)
self.editor.setMaximumWidth(self._offset)
vbox = QtGui.QVBoxLayout(self.widget)
vbox.setContentsMargins(0, 0, 0, 0)
vbox.addWidget(self.listbox)
vbox.addWidget(self.button)
layout = QtGui.QHBoxLayout(self)
layout.addWidget(self.widget)
layout.addWidget(self.editor)
layout.setSizeConstraint(QtGui.QLayout.SetMinAndMaxSize)
self.animator = QtCore.QParallelAnimationGroup(self)
for item in (self, self.editor):
animation = QtCore.QPropertyAnimation(item, 'maximumWidth')
animation.setDuration(800)
animation.setEasingCurve(QtCore.QEasingCurve.OutCubic)
self.animator.addAnimation(animation)
self.animator.finished.connect(self.handleFinished)
def handleButton(self):
for index in range(self.animator.animationCount()):
animation = self.animator.animationAt(index)
width = animation.targetObject().width()
animation.setStartValue(width)
if self._closed:
self.editor.show()
animation.setEndValue(width + self._offset)
else:
animation.setEndValue(width - self._offset)
self._closed = not self._closed
self.widget.setMinimumSize(self.widget.size())
self.layout().setSizeConstraint(QtGui.QLayout.SetFixedSize)
self.animator.start()
def handleFinished(self):
if self._closed:
self.editor.hide()
self.layout().setSizeConstraint(QtGui.QLayout.SetMinAndMaxSize)
self.widget.setMinimumSize(0, 0)
self.setMaximumWidth(self._maxwidth)
if __name__ == '__main__':
import sys
app = QtGui.QApplication(sys.argv)
window = Window()
window.move(500, 300)
window.show()
sys.exit(app.exec_())