QLineEdit中单击ClearButton的自定义方法

Question

是否可以在单击QLineEdit中的ClearButton时运行自定义方法？

例如，我在QCombobox中有一个ClearButton，并且我想在单击此ComboBox中的ClearButton时设置默认索引。

我已经尝试继承QLineEdit的'clear（）'插槽，但是没有成功。

Answer 1

import sys
from PyQt5.QtWidgets import (QLineEdit, QApplication, QWidget, QVBoxLayout)
import qtawesome as qt


class Widget(QWidget):
    def __init__(self, parent=None):
        super(QWidget, self).__init__(parent)
        self.flag = 0
        self.layout = QVBoxLayout()
        self.line_edit = QLineEdit()
        self.line_edit.setClearButtonEnabled(False)
        self.line_edit.textChanged.connect(self._on_line_edit_text_changed)
        self.clear_icon = qt.icon('mdi.delete-circle-outline', color='gray', color_active='black')
        self.clear_action = None
        self.layout.addWidget(self.line_edit)
        self.setLayout(self.layout)

    def _on_line_edit_text_changed(self):
        if self.line_edit and self.line_edit.text():
            if not self.clear_action:
                self.clear_action = self.line_edit.addAction(self.clear_icon, QLineEdit.TrailingPosition)
                self.clear_action.triggered.connect(self._on_clear_clicked)
        elif self.clear_action and self.line_edit and not self.line_edit.text():
            self.line_edit.removeAction(self.clear_action)
            self.clear_action = None

    def _on_clear_clicked(self):
        self.line_edit.clear()


if __name__ == "__main__":
    app = QApplication(sys.argv)
    w = Widget()
    w.show()
    sys.exit(app.exec_())