Question

我正在尝试从子窗口小部件printName调用父方法treeView 但得到像

这样的错误

AttributeError：＆＃39; QSplitter＆＃39;对象没有属性＆＃39; printName＆＃39;
QObject :: startTimer：QTimer只能用于以QThread启动的线程

为什么父母指的是QSplitter？

TreeView

compositeWidget

TreeView

compositeWidget

CODE：

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


class MainExample(QMainWindow):

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

    def initUI(self):
        self.mainWidget = compositeWidget(self)
        self.setCentralWidget(self.mainWidget)
        self.mainWidget.treeView.setPath('D:\DATA')
        self.setGeometry(300, 300, 300, 200)


class TreeView(QTreeView):

    def __init__(self, parent):
        super(TreeView, self).__init__(parent)
        self.clicked.connect(self.on_treeView_clicked)

    @pyqtSlot(QModelIndex)
    def on_treeView_clicked(self, index):
        indexItem = self.FileSystemModel.index(index.row(), 0, index.parent())
        filePath = self.FileSystemModel.filePath(indexItem)
        self.parent().printName(filePath)
        #

    def setPath(self, path):
        self.FileSystemModel = QFileSystemModel()
        self.FileSystemModel.setFilter(QDir.Dirs | QDir.NoDotAndDotDot)
        self.FileSystemModel.setRootPath(path)
        self.setModel(self.FileSystemModel)
        index = self.FileSystemModel.index(path)
        self.setRootIndex(index)


class compositeWidget(QWidget):

    def __init__(self, parent):
        super(compositeWidget, self).__init__(parent)
        self.treeView = TreeView(self)
        self.frame = QFrame()
        splitterHorizontal = QSplitter(Qt.Horizontal)
        splitterHorizontal.addWidget(self.treeView)
        splitterHorizontal.addWidget(self.frame)
        splitterHorizontal.setSizes([10, 190])
        self.layout = QHBoxLayout(self)
        self.layout.addWidget(splitterHorizontal)
        self.setLayout(self.layout)

    def printName(self):
        print 'fileName'


def main():

    app = QApplication(sys.argv)
    ex = MainExample()
    ex.show()
    sys.exit(app.exec_())


if __name__ == '__main__':
    main()

Answer 1

QTreeView位于QSplitter下，是在compositeWidget下。你需要打电话

self.parent().parent().printName(filePath)

Answer 2

不幸的是，这似乎没有记录（这似乎有点疏忽），但与Qt中的其他QLayout.addWidget()方法一样（如QSplitter.addWidget()）QSplitter方法通过成为孩子的父母来取得孩子的所有权。

这就是Treeview.parent()返回class TreeView(QTreeView): def __init__(self, parent): super(TreeView, self).__init__(parent) self.clicked.connect(self.on_treeView_clicked) self.composite_widget = parent @pyqtSlot(QModelIndex) def on_treeView_clicked(self, index): indexItem = self.FileSystemModel.index(index.row(), 0, index.parent()) filePath = self.FileSystemModel.filePath(indexItem) self.composite_widget.printName(filePath) # def setPath(self, path): self.FileSystemModel = QFileSystemModel() self.FileSystemModel.setFilter(QDir.Dirs | QDir.NoDotAndDotDot) self.FileSystemModel.setRootPath(path) self.setModel(self.FileSystemModel) index = self.FileSystemModel.index(path) self.setRootIndex(index)的原因。您应该使用另一种方式来访问所需的父级（例如，显式存储对传递给构造函数的父级的引用）

filter.ServerCredential = new Windows.Security.Credentials.PasswordCredential(uri.ToString(), username, pass);

python从子窗口小部件调用父方法

2 个答案: