将QTreeWidget和QPlainTextEdit结合起来

您可以将QTreeWidget的项与QPlainTextEdit中的文本相关联，以便在选择QTreeWidget中的项时在QPlainTextEdit中显示相应的文本。以下是一个简单的示例：

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QTreeWidget, QPlainTextEdit, QHBoxLayout, QTreeWidgetItem

class Example(QWidget):
    
    def __init__(self):
        super().__init__()
        self.initUI()
        
    def initUI(self):
        self.tree = QTreeWidget()
        self.tree.setColumnCount(1)
        self.tree.setHeaderHidden(True)
        self.tree.itemSelectionChanged.connect(self.displayText)

        # 添加树节点和文本
        root = QTreeWidgetItem(self.tree)
        root.setText(0, "Root")
        child1 = QTreeWidgetItem(root)
        child1.setText(0, "Child 1")
        child1Text = "This is the text for Child 1"
        child2 = QTreeWidgetItem(root)
        child2.setText(0, "Child 2")
        child2Text = "This is the text for Child 2"

        self.textEdit = QPlainTextEdit()
        self.textEdit.setReadOnly(True)

        # 布局
        hbox = QHBoxLayout()
        hbox.addWidget(self.tree)
        hbox.addWidget(self.textEdit)

        self.setLayout(hbox)

        self.setGeometry(300, 300, 350, 250)
        self.setWindowTitle('QTreeWidget and QPlainTextEdit Example')
        self.show()

    def displayText(self):
        item = self.tree.currentItem()
        if item is None:
            return
        if item.text(0) == "Child 1":
            self.textEdit.setPlainText(child1Text)
        elif item.text(0) == "Child 2":
            self.textEdit.setPlainText(child2Text)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())

在此示例中，我们创建了一个QTreeWidget和一个QPlainTextEdit，并使用QHBoxLayout将它们放在一起。我们添加了两个树节点，并将其与相应的文本相关联。当选择QTreeWidget中的项时，我们在QPlainTextEdit中显示相应的文本。