PyQt4:是否有与滚动条相关的信号?

问题描述：

我计划创建两个 listWidget 并且它们具有相同数量的列表.因此，当一个 listWidget 上下滚动时，另一个也会移动它的列表.但是，我找不到相关信号.我错过了什么吗?

I plan to create a two listWidget and they have same amount of list. So, when a listWidget scroll up and down, another one also travel it's list. But, I can't find related signal. Did I miss something?

答

您需要将一个滚动条的 valueChanged 信号连接到另一个滚动条的 setValue 槽(反之亦然).

You need to connect the valueChanged signals of one scrollbar to the setValue slot of the other scrollbar (and vice versa).

乍一看，这似乎是危险的递归，但 Qt 似乎可以毫无问题地处理它，如下例所示:

At first glance, this might seem dangerously recursive, but Qt seems to handle it without any problem, as this example shows:

from PyQt4 import QtGui, QtCore

class Window(QtGui.QWidget):
    def __init__(self):
        QtGui.QWidget.__init__(self)
        self.listA = QtGui.QListWidget(self)
        self.listB = QtGui.QListWidget(self)
        layout = QtGui.QHBoxLayout(self)
        layout.addWidget(self.listA)
        layout.addWidget(self.listB)
        for index in range(100):
            self.listA.addItem('Sample text for Item %d' % index)
            self.listB.addItem('Sample text for Item %d' % index)
        self.listA.horizontalScrollBar().valueChanged.connect(
            self.listB.horizontalScrollBar().setValue)
        self.listB.horizontalScrollBar().valueChanged.connect(
            self.listA.horizontalScrollBar().setValue)
        self.listA.verticalScrollBar().valueChanged.connect(
            self.listB.verticalScrollBar().setValue)
        self.listB.verticalScrollBar().valueChanged.connect(
            self.listA.verticalScrollBar().setValue)

if __name__ == '__main__':

    import sys
    app = QtGui.QApplication(sys.argv)
    window = Window()
    window.show()
    sys.exit(app.exec_())

PyQt4:是否有与滚动条相关的信号?

相关推荐