使用线程和信号与 Python 生成 QTreeView

如何解决使用线程和信号与 Python 生成 QTreeView

我正在尝试创建一个应用程序，该应用程序将使用 PySide6 通过 API 获取数据并将它们呈现在 QTreeView 中。由于获取数据需要很长时间，我想使用 QThread 检索它们。我的示例代码如下：

import logging
import time

from PySide6.QtCore import *
from PySide6.QtGui import *
from PySide6.QtWidgets import *

logging.basicConfig(
    format="%(asctime)s - %(name)s - %(levelname)s - %(message)s",level=logging.INFO)

class MainWindow(QMainWindow):
    gettingData = False
    counting = False


    def __init__(self,*args,**kwargs):
        super(MainWindow,self).__init__(*args,**kwargs)

        self.counter = 0

        layout = QVBoxLayout()


        self.b = QPushButton("Start Counting with a Thread")
        self.bt1 = QPushButton("Generate tree with Thread")
        self.bt2 = QPushButton("Generate tree without a Thread")
        self.tree = QTreeView()

        layout.addWidget(self.b)
        layout.addWidget(self.bt1)
        layout.addWidget(self.bt2)
        layout.addWidget(self.tree)
        self.b.clicked.connect(self.startCounting)
        self.bt1.clicked.connect(self.startGenerating)
        self.bt2.clicked.connect(self.startGenerating2)

        w = QWidget()
        w.setLayout(layout)

        self.setCentralWidget(w)

        self.show()

        self.threadpool = QThreadPool()
        print("Multithreading with maximum %d threads" % self.threadpool.maxThreadCount())

    def startCounting(self):
        thread = Thread(self.counting)
        thread.signal.signal.connect(self.something)
        self.threadpool.start(thread)

    def something(self,signal):
        if signal == "False":
            logging.info("Counting is Complete")
        else:
            logging.info(signal)

    def startGenerating(self):
        thread = DataThread()
        thread.signals.signal_QStandardItemModel.connect(self.treeAction)
        self.threadpool.start(thread)

    def treeAction(self,signal):
        self.tree.setModel(signal)

    def startGenerating2(self):
        start = time.perf_counter()
        siteTreeViewModel = QStandardItemModel()
        rootNode = siteTreeViewModel.invisibleRootItem()
        aItem = TreeStandardItem("A")
        bItem = TreeStandardItem("B")
        cItem = TreeStandardItem("C")
        rootNode.appendRow(aItem)
        time.sleep(3)
        rootNode.appendRow(bItem)
        time.sleep(3)
        bItem.appendRow(cItem)
        self.tree.setModel(siteTreeViewModel) 
        end = time.perf_counter() - start
        logging.info("Generated tree in "+str(end))     



class Thread(QRunnable):

    def __init__(self,counting):
        super(Thread,self).__init__()
        self.counting = counting
        self.signal = Signal()

    def run(self):
        for x in range(10):
            self.signal.signal.emit(str(x))
            time.sleep(.1)
        counting = False
        self.signal.signal.emit(str(counting))

class Signal(QObject):
    signal = Signal(str)

class DataThread(QRunnable):

    def __init__(self):
        super(DataThread,self).__init__()
        self.signals = WorkerSignals()

    def run(self):
        logging.info("Start generating the tree")

        start = time.perf_counter()
        siteTreeViewModel = QStandardItemModel()
        rootNode = siteTreeViewModel.invisibleRootItem()
        aItem = TreeStandardItem("A")
        bItem = TreeStandardItem("B")
        cItem = TreeStandardItem("C")
        rootNode.appendRow(aItem)
        time.sleep(2)
        rootNode.appendRow(bItem)
        time.sleep(2)
        bItem.appendRow(cItem)
        end = time.perf_counter() - start
        self.signals.signal_QStandardItemModel.emit(siteTreeViewModel)
        logging.info("Generated tree in "+str(end))
        self.signals.finished.emit()

class TreeStandardItem(QStandardItem):
    def __init__(self,txt=''):
        super().__init__()
        self.setEditable = False
        self.setForeground(QColor(255,255,255))
        self.setText(txt)

class WorkerSignals(QObject):
    signal_QStandardItemModel = Signal()
    finished = Signal()

app = QApplication([])
window = MainWindow()
app.exec()

第一个计数按钮按预期工作，创建了一个线程。 在没有线程的情况下生成树，确认我尝试使用线程运行的代码正在工作 一旦我尝试使用线程运行树生成，我就会收到以下错误：

Traceback (most recent call last):
  File "/home/giunz/code/tutorial/threaded-tree-01.py",line 61,in startGenerating
    thread.signals.signal_QStandardItemModel.connect(self.treeAction)
TypeError: PySide6.QtCore.QObject.connect(): not enough arguments

更新 1： 稍微更改了代码，导致出现新错误。该错误似乎与 signal_QStandardItemModel 无法返回对象有关。 有什么建议吗？