PyQt4的WheelEvent从孩子父母

Question

嗨，我的问题是有关这一点：在Qt Designer中创建PyQT4 WheelEvent

from PyQt4.QtGui import * 
from PyQt4.QtCore import * 

import sys 


class Main(QWidget): 
    def __init__(self, parent=None): 
     super(Main, self).__init__(parent) 

     layout = QHBoxLayout(self) 
     layout.addWidget(Scroll(self)) 


class Scroll(QScrollArea): 

    def __init__(self, parent=None): 
     super(Scroll, self).__init__(parent) 
     self.parent = parent 

    def wheelEvent(self, event): 
     super(Scroll, self).wheelEvent(event) 
     print "wheelEvent", event.delta() 

     newHeight = self.parent.geometry().height() - event.delta() 
     width  = self.parent.geometry().width() 
     self.parent.resize(width, newHeight) 

app = QApplication(sys.argv) 
main = Main() 
main.show() 
sys.exit(app.exec_()) 

我的卷轴类，我必须把它

没有访问是否有任何机会，有访问PyQT WheelEvent的滚动类，但在主类？

Answer 1

使用event-filter：

class Main(QWidget): 
    def __init__(self, parent=None): 
     ...    
     self.scroll.installEventFilter(self) 

    def eventFilter(self, source, event): 
     if event.type() == QEvent.Wheel and source is self.scroll: 
      print "wheelEvent", event.delta() 
      newHeight = self.geometry().height() - event.delta() 
      width = self.geometry().width() 
      self.resize(width, newHeight) 
      # return True to consume the event 
      return False 
     return super(Main, self).eventFilter(source, event)