Python pyqt4：自动调整QScrollArea的大小

我有一个包含复选框列表的滚动区域。我想这个滚动区域的大小调整到应用程序的大小。我不知道怎么做。如有任何建议，将不胜感激。我在其他帖子中也遇到过这个问题，但没有找到解决方案，或者至少没有找到我理解的解决方案

from PyQt4 import QtGui, QtCore

class Screen3(QtGui.QWidget):       # Screen to display data

    def __init__(self, parent=None):
        QtGui.QWidget.__init__(self, parent)

        # layout for check box container widget
        chkBoxLayout = QtGui.QVBoxLayout(self)
        # create list of checkboxes
        self.checkboxes = []
        numofCheckboxes = 30
        for x in range(numofCheckboxes):
            self.checkboxes.append(QtGui.QCheckBox('test'))
        # add checkboxes to chkBoxLayout
        for i, chkbox in enumerate(self.checkboxes):
            chkbox.setChecked(True)
            chkBoxLayout.addWidget(chkbox)
        chkBoxLayout.addStretch(1) 
        chkBoxLayout.setMargin(0);
        chkBoxLayout.setContentsMargins(0,0,0,0)
        chkBoxLayout.setSpacing(0) 

        # checkbox container widget       
        widget = QtGui.QWidget()  
        widget.setStyleSheet(""".QWidget {background-color: rgb(255, 255, 255);}""")
        widget.setLayout(chkBoxLayout)

        # checkbox scroll area, gives scrollable view on widget
        scroll = QtGui.QScrollArea()
        scroll.setMinimumWidth(120)
        scroll.setMinimumHeight(200) # would be better if resizable
        scroll.setWidgetResizable(True)
        scroll.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAsNeeded)
        scroll.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)         
        scroll.setWidget(widget)   

        self.samplePanel = QtGui.QVBoxLayout()
        self.samplePanel.addWidget(scroll)
        self.samplePanel.addStretch(1)  

        # horizontal layout
        hbox = QtGui.QHBoxLayout()
        hbox.addLayout(self.samplePanel)
        hbox.addStretch(1)
        self.setLayout(hbox)
        self.resize(100, 500)

if __name__ == "__main__":
    import sys
    app = QtGui.QApplication(sys.argv)
    Screen = Screen3()
    Screen.show()
    sys.exit(app.exec_())

---

您必须将

QScrollArea

添加到主布局中，不需要创建其他布局

class Screen3(QtGui.QWidget):       # Screen to display data
    def __init__(self, parent=None):
        QtGui.QWidget.__init__(self, parent)

        # layout for check box container widget
        chkBoxLayout = QtGui.QVBoxLayout()
        # create list of checkboxes
        self.checkboxes = []
        numofCheckboxes = 30
        for x in range(numofCheckboxes):
            self.checkboxes.append(QtGui.QCheckBox('test'))
        # add checkboxes to chkBoxLayout
        for i, chkbox in enumerate(self.checkboxes):
            chkbox.setChecked(True)
            chkBoxLayout.addWidget(chkbox)
        chkBoxLayout.addStretch(1) 
        chkBoxLayout.setMargin(0);
        chkBoxLayout.setContentsMargins(0,0,0,0)
        chkBoxLayout.setSpacing(0) 

        # checkbox container widget       
        widget = QtGui.QWidget()  
        widget.setStyleSheet(""".QWidget {background-color: rgb(255, 255, 255);}""")
        widget.setLayout(chkBoxLayout)

        # checkbox scroll area, gives scrollable view on widget
        scroll = QtGui.QScrollArea()
        scroll.setMinimumWidth(120)
        scroll.setMinimumHeight(200) # would be better if resizable
        scroll.setWidgetResizable(True)
        scroll.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAsNeeded)
        scroll.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)         
        scroll.setWidget(widget)  

        lay = QtGui.QVBoxLayout(self)
        lay.addWidget(scroll)

---

请参阅我的答案：PYes这是可行的，但我过度简化了我的原始代码。我还需要一些按钮，这就是为什么我有QVBoxLayout。谢谢你的回答，但是我意识到我所需要做的就是移除self.samplePanel.addStretch（1）谢谢你的帮助。