Question

我写了一个可执行程序。我的想法是在运行时加载QTreeWidget中的所有数据项。这就是我想使用QThread的原因。我不希望GUI在处理大数据时冻结。但是当我运行这个示例程序时，无论如何都会冻结。但为什么呢？

import sys

from PyQt4.QtCore import QThread, pyqtSignal, Qt
from PyQt4.QtGui import QVBoxLayout, QPushButton, QDialog, QProgressBar, QApplication, \
     QMessageBox, QTreeWidget, QTreeWidgetItem

class Test_Thread(QThread):
    notify_progress = pyqtSignal(str)

    def __init__(self, parent=None):
        QThread.__init__(self, parent)

    def create_items(self):
         for elem in xrange(190000):
             yield elem

    def run(self):
        for i in self.create_items():
            self.notify_progress.emit(str(i))

class MyCustomDialog(QDialog):

    def __init__(self):
        super(MyCustomDialog, self).__init__()
        layout = QVBoxLayout(self)

        self.tree = QTreeWidget(self)

        self.pushButton_start = QPushButton("Start", self)
        self.pushButton_close = QPushButton("Close", self)

        layout.addWidget(self.tree)
        layout.addWidget(self.pushButton_start)
        layout.addWidget(self.pushButton_close)

        self.test_task = Test_Thread()
        self.test_task.notify_progress.connect(self.fill_tree_widget)

        self.pushButton_start.clicked.connect(self.on_start)
        self.pushButton_close.clicked.connect(self.close)

    def fill_tree_widget(self, i):
        parent = QTreeWidgetItem(self.tree)
        parent.setText(0, "Number: {}".format(i))
        parent.setCheckState(0, Qt.Unchecked)
        parent.setFlags(parent.flags() | Qt.ItemIsTristate | Qt.ItemIsUserCheckable)

    def on_start(self):
        self.test_task.start()

def main():
    app = QApplication(sys.argv)
    window = MyCustomDialog()
    window.resize(600, 400)
    window.show()
    sys.exit(app.exec_())

if __name__ == "__main__":
    main()

PyQt 4 - QThread不起作用？

0 个答案: