title: Get the value of scrollbar produce by scrollarea in pyqt4 python
body: <p>I've create a frame with scroll by using the code below. And inside the frame i created another widget that can be drag and drop. The problem is when the vertical scrollbar is present and let say you scroll it down then drag and drop the object, the object drops at the wrong y coordinates. Can i get the value of the scroll bar then add it to the y coordinate? Or is there other ways to solve this? Thanks in advance :)</p>
  
  <pre><code>#Main Layout 
  layout = QtGui.QVBoxLayout() 
  layout.setSpacing(0)         
  self.centralWidget.setLayout(layout) 
  
  #Content Layout 
  self.frame = QtGui.QFrame()
  self.frame.setMinimumSize(400, 1000)
  
  self.scrollArea = QtGui.QScrollArea() 
  self.scrollArea.setWidget(self.frame)
  self.scrollArea.setWidgetResizable(True)
  layout.addWidget(self.scrollArea)
  </code></pre>