PySide6 GUI 编程（11）：QLineEdit的使用

原创

bowenerchen

发布于 2024-07-22 22:44:00

981

发布于 2024-07-22 22:44:00

文章被收录于专栏：编码视界

编辑框的基本操作

编辑动作与响应

from PySide6.QtWidgets import QApplication, QLineEdit, QMainWindow


class MyLineEdit(QMainWindow):
    def __init__(self):
        super().__init__()

        self.my_line_edit = QLineEdit()
        self.my_line_edit.setText('默认显示的数据')
        self.my_line_edit.setMaxLength(5)
        self.my_line_edit.setPlaceholderText('占位符，请在这里输入数据')
        self.my_line_edit.returnPressed.connect(self.on_return_pressed)
        self.my_line_edit.textChanged.connect(self.on_text_edited)
        self.my_line_edit.textChanged.connect(self.on_text_changed)
        self.setCentralWidget(self.my_line_edit)

    def on_return_pressed(self):
        print('当前的字符：', self.my_line_edit.text())

    def on_text_edited(self, data: str):
        if len(self.my_line_edit.text()) >= self.my_line_edit.maxLength():
            print('已经达到最大字符长度：{}'.format(self.my_line_edit.maxLength()))
            return
        print('字符被编辑：', data, )

    def on_text_changed(self, data: str):
        if len(self.my_line_edit.text()) >= self.my_line_edit.maxLength():
            self.my_line_edit.setToolTip('内容长度达到了最大上限:{}个字符'.format(self.my_line_edit.maxLength()))
            return
        self.my_line_edit.setToolTip('内容被改变了')
        print('字符被改变了：', data)


if __name__ == '__main__':
    app = QApplication()
    ins = MyLineEdit()
    ins.show()
    app.exec()

核心步骤拆解

回车响应

编辑与编辑完成时的动作响应

最大字符提示

占位符展示

选中内容与响应

from PySide6.QtWidgets import QApplication, QLineEdit, QMainWindow


class MyLineEdit(QMainWindow):
    def __init__(self):
        super().__init__()

        self.my_line_edit = QLineEdit()
        self.my_line_edit.setText('默认显示的数据')
        self.my_line_edit.setReadOnly(True)
        self.my_line_edit.selectionChanged.connect(self.on_selected_changed)
        self.setCentralWidget(self.my_line_edit)

    def on_selected_changed(self):
        print(self.my_line_edit.selectedText())


if __name__ == '__main__':
    app = QApplication()
    ins = MyLineEdit()
    ins.show()
    app.exec()