重新加载 QTextEdit 文本

Question

我有一个示例代码，我想通过按 查找和替换 按钮重新加载 QTextEdit 中的文本。 QTextEdit 文本已经从 dictionary 加载，我想用 dictionary new key 更改 dictionary old key 之一并在更改字典旧键后在QTextEdit中显示新键！

我的意思是 QTextEdit 的新细节没有显示，旧信息保留。

我是怎么做到的？

import sys
from PyQt5 import QtCore, QtGui, QtWidgets

class Window(QtWidgets.QMainWindow):
    my_dict = {'key1': 'value1', 'key2': 'value2'}
    def __init__(self):
        super(Window, self).__init__()
        V = QtWidgets.QApplication.desktop().screenGeometry()
        h, w, x, y = V.height(), V.width(), 1000, 600
        self.setGeometry(h/4, w/20, x, y)
        self.setFixedSize(x, y)
        self.setWindowTitle('Main Window')
        centralWidget = QtWidgets.QWidget()
        self.setCentralWidget(centralWidget)
        self.grid = QtWidgets.QGridLayout(centralWidget)
        self.home()

    def home(self):
        self.tools_in_home()
        self.show()

    def tools_in_home(self):
        global find_entry
        global replace_entry
        global textBox
        self.groupBox0 = QtWidgets.QGroupBox('Test') 
        self.groupBox0.setFixedSize(400, 150)
        hBoxLayout = QtWidgets.QHBoxLayout()
        textBox = QtWidgets.QTextEdit()
        textBox.resize(400, 200)
        textBox.setReadOnly(True)
        list_keys = list(Window.my_dict.keys())
        list_values = list(Window.my_dict.values())
        if len(list_keys) == 0:
            textBox.append('--EMPTY--')
        else:
            for num, dict_key in enumerate(list_keys):
                res = '{:50s} | {:50s}'.format(dict_key, list_values[num])
                textBox.append(res)

        hBoxLayout.addWidget(textBox)
        self.groupBox0.setLayout(hBoxLayout)

        find_entry = QtWidgets.QLineEdit('Enter the value you want to find...')
        find_entry.setFixedSize(380,25)

        replace_entry = QtWidgets.QLineEdit('Enter the value you want to replace...')
        replace_entry.setFixedSize(380,25)

        replace_btn = QtWidgets.QPushButton('Find and Replace')
        replace_btn.setFixedSize(125, 25)
        replace_btn.clicked.connect(self.replace_in_dict)

        self.grid.addWidget(self.groupBox0, 0, 0)
        self.grid.addWidget(find_entry, 1, 0)
        self.grid.addWidget(replace_entry, 2, 0)
        self.grid.addWidget(replace_btn, 3, 0)

    def replace_in_dict(self):
        findwt = find_entry.text()
        ans_of_findwt = Window.my_dict.get(findwt, 'Not Exist')
        if ans_of_findwt == 'Not Exist':
            QtWidgets.QMessageBox.warning(self, ans_of_findwt, 'There is no result', QtWidgets.QMessageBox.Ok)

        else:
            old_key, old_value = findwt, Window.my_dict.pop(findwt)
            new_key = replace_entry.text()
            Window.my_dict.update({new_key: old_value})
            QtWidgets.QMessageBox.information(self, 'Success','[{0}] has replaced successfully with [{1}]\n\nResult:\n\t{1} : {2}'.format(old_key, new_key, old_value), QtWidgets.QMessageBox.Ok)

def run():
    app = QtWidgets.QApplication(sys.argv)
    GUI = Window()
    sys.exit(app.exec_())

if __name__ == '__main__':
    run()

Answer 1

您的代码有以下错误：

• 您假设更改字典时会重新加载文本，但事实并非如此，因此您必须实现一个替换文本的函数。
• 假设您想保留顺序，您必须使用 OrderedDict，因为默认字典不保留顺序。
• 要验证字典中是否有键，请勿使用 get，因为您默认使用的单词（“不存在”）可能属于字典，因此最好使用 in。

综合以上，解决办法是：

import sys
from collections import OrderedDict
from PyQt5 import QtCore, QtGui, QtWidgets


class MainWindow(QtWidgets.QMainWindow):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)

        groupBox = QtWidgets.QGroupBox("Test")
        self._textBox = QtWidgets.QTextEdit(readOnly=True)
        hBoxLayout = QtWidgets.QHBoxLayout()
        hBoxLayout.addWidget(self._textBox)
        groupBox.setLayout(hBoxLayout)

        self._find_entry = QtWidgets.QLineEdit(
            placeholderText="Enter the value you want to find..."
        )
        self._replace_entry = QtWidgets.QLineEdit(
            placeholderText="Enter the value you want to replace..."
        )
        replace_btn = QtWidgets.QPushButton(
            text="Find and Replace", clicked=self.on_clicked
        )

        central_widget = QtWidgets.QWidget()
        self.setCentralWidget(central_widget)
        lay = QtWidgets.QVBoxLayout(central_widget)
        lay.addWidget(groupBox)
        lay.addWidget(self._find_entry)
        lay.addWidget(self._replace_entry)
        lay.addWidget(replace_btn)
        self.resize(640, 480)

        self._my_dict = OrderedDict({"key1": "value1", "key2": "value2"})
        self.load_dictionary(self._my_dict)

    @QtCore.pyqtSlot()
    def on_clicked(self):
        old_key = self._find_entry.text()
        new_key = self._replace_entry.text()
        self.replace_key(old_key, new_key)

    def load_dictionary(self, d):
        self._textBox.clear()
        for key, value in d.items():
            res = "{:50s} | {:50s}".format(key, value)
            self._textBox.append(res)

    def replace_key(self, old_key, new_key):
        # https://stackoverflow.com/a/1602964/6622587
        if old_key in self._my_dict:
            # https://stackoverflow.com/a/12150917/6622587
            self._my_dict = OrderedDict(
                [
                    (new_key, v) if k == old_key else (k, v)
                    for k, v in self._my_dict.items()
                ]
            )
            self.load_dictionary(self._my_dict)
        else:
            QtWidgets.QMessageBox.warning(
                self,
                "Not Exist",
                "There is no result",
                QtWidgets.QMessageBox.Ok,
            )


def run():
    app = QtWidgets.QApplication(sys.argv)
    gui = MainWindow()
    gui.show()
    sys.exit(app.exec_())


if __name__ == "__main__":
    run()