无法动态重置QSplitter中小部件的最大高度

Question

我想让QSplitterHandle仅调整其上方的小部件，通过：

1. 最初在QFrame中修复所有小部件（实际上是QSplitter）的最大和最小高度。
2. 在QSplitterHandle::mousePressEvent“增加”最大高度，并在QSplitterHandle::mouseReleaseEvent重置最大高度为当前。

码

#! /usr/bin/python

import sys
from PySide import QtGui
from PySide import QtCore

# Custom Splitter Handle
class SplitterHandle(QtGui.QSplitterHandle):
   QWIDGET_MAX_HEIGHT = 1000

   def __init__(self, index , orientation, parent):
      super(SplitterHandle , self).__init__(orientation, parent)
      self.index = index

   def getWidget( self ):
      return self.splitter().widget( self.index )

   # Remove height restriction on corresponding widget when dragging starts
  def mousePressEvent(self ,event ):
     widget = self.getWidget()
     widget.setMinimumHeight( 100 ) # FIX
     widget.setMaximumHeight( self.QWIDGET_MAX_HEIGHT )
     return QtGui.QSplitterHandle.mousePressEvent(self,event)

  # Freeze height of corresponding widget after dragging has ends
  def mouseReleaseEvent(self ,event ):
     widget = self.getWidget()
     widget.setMinimumHeight( widget.height() ) # FIX
     widget.setMaximumHeight( widget.height() )
     return QtGui.QSplitterHandle.mousePressEvent(self,event)

# Custom Splitter
class Splitter(QtGui.QSplitter):
   def __init__( self , orientation , parent = None):
      super(Splitter , self).__init__(orientation,parent)
      self.orientation = orientation

   def createHandle( self):
      return SplitterHandle( self.count() , self.orientation , self )      


class Example(QtGui.QWidget):
   def __init__(self):
      super(Example, self).__init__()
      hbox = QtGui.QVBoxLayout(self)

      frame1 = QtGui.QFrame()
      frame1.setFrameShape(QtGui.QFrame.StyledPanel)
      frame1.setMinimumHeight( 100 )
      frame1.setMaximumHeight( 100 )
      frame1.setStyleSheet("background-color: red;");

      frame2 = QtGui.QFrame()
      frame2.setFrameShape(QtGui.QFrame.StyledPanel)
      frame2.setMinimumHeight( 100 ) 
      frame2.setMaximumHeight( 100 )
      frame2.setStyleSheet("background-color: green;");

      frame3 = QtGui.QFrame()
      frame3.setFrameShape(QtGui.QFrame.StyledPanel)
      frame3.setMinimumHeight( 100 ) 
      frame3.setMaximumHeight( 100 )
      frame3.setStyleSheet("background-color: blue;");

      frame4 = QtGui.QFrame()
      frame4.setFrameShape(QtGui.QFrame.StyledPanel)
      frame4.setMinimumHeight( 100 ) 
      frame4.setMaximumHeight( 100 )
      frame4.setStyleSheet("background-color: yellow;");

      # The "absorber"
      frame5 = QtGui.QFrame()
      frame5.setStyleSheet("background-color: white;");

      ########################

      splitter = Splitter(QtCore.Qt.Vertical)

      splitter.addWidget(frame1)
      splitter.addWidget(frame2)
      splitter.addWidget(frame3)
      splitter.addWidget(frame4)
      splitter.addWidget(frame5)

      splitter.setChildrenCollapsible( False )
      hbox.addWidget(splitter)  

      self.setGeometry(300, 300, 300, 600)
      self.setWindowTitle('--Splitter--')
      self.show()

def main():
   app = QtGui.QApplication(sys.argv)
   ex = Example()
   sys.exit(app.exec_())

if __name__ == '__main__':
   main()

查看应用截图。问题是动态重置小部件高度的尝试失败。

Answer 1

问题是您正在将最大大小应用于由于传递不适当的索引而导致的不正确的小部件。解决方案是通过它self.count()-1：

def createHandle( self):
    return SplitterHandle(self.count()-1, self.orientation , self)