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72 lines
3.1 KiB
Python
72 lines
3.1 KiB
Python
import sys
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from PySide6 import QtGui, QtWidgets
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"""
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QLineEdit 信号
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由于QLineEdit的信号解释较为复杂，建议参考官方文档的详细信息
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https://doc.qt.io/qt-6/qlineedit.html#signals
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.textChanged(text: str) 当编辑器中的文本发生改变时发射此信号，新的文本作为参数传出
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.textEdited(text: str) 当编辑器中的文本被用户编辑时发射此信号，新的文本作为参数传出，编程方式改变文本无效
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.cursorPositionChanged(old_pos: int, new_pos: int) 当光标位置变化时发射此信号，传出旧新光标位置
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.selectionChanged() 当选中状态改变时发射此信号，可以通过.selectedText()等方法获取新的选中
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.returnPressed() 当用户按下Enter/Return键时发射此信号，当设置了掩码或验证器时只有接受输入才发射
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.editingFinished() 按下Enter/Return键、编辑器失去焦点且内容变化时发射此信号
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.inputRejected() 当用户输入被验证器拒绝时发射此信号
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"""
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class MyWidget(QtWidgets.QWidget):
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self.setWindowTitle("QLineEdit-信号")
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self.resize(800, 600)
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self.setup_ui()
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self.signal_test()
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def setup_ui(self) -> None:
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"""设置界面"""
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# 创建及初始化控件
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self.line_edit = QtWidgets.QLineEdit(self)
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self.info_label = QtWidgets.QLabel(self)
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button = QtWidgets.QPushButton("用于将焦点移出LineEdit的空白按钮")
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# 通过布局管理器布局控件
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layout = QtWidgets.QVBoxLayout()
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layout.addWidget(self.line_edit)
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layout.addWidget(self.info_label)
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layout.addWidget(button)
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self.setLayout(layout)
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def signal_test(self) -> None:
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"""测试LineEdit的信号"""
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def show_info(info: str) -> None:
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self.info_label.setText(info)
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self.info_label.adjustSize()
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# 测试以下各种信号时，每次只测试一个，注释掉其他
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# self.line_edit.textChanged.connect(lambda text: show_info(f"文本改变为{text}")) # type: ignore
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self.line_edit.textEdited.connect(lambda text: show_info(f"文本被编辑为{text}")) # type: ignore
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self.line_edit.setText("通过编程改变的文本") # 会触发textChanged，但不会触发textEdited
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# self.line_edit.cursorPositionChanged.connect(
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# lambda old, new: show_info(f"光标由{old}移动到了{new}")
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# ) # type: ignore
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# self.line_edit.selectionChanged.connect(show_info("选择改变了")) # type: ignore
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# self.line_edit.returnPressed.connect(show_info("用户按下了Enter")) # type: ignore
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# self.line_edit.editingFinished.connect(show_info("结束编辑")) # type: ignore
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self.line_edit.setValidator(QtGui.QIntValidator(10, 99, self.line_edit)) # 设置验证器
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self.line_edit.inputRejected.connect(show_info("输入被拒绝了")) # type: ignore
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if __name__ == "__main__":
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app = QtWidgets.QApplication(sys.argv)
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window = MyWidget()
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window.show()
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sys.exit(app.exec())
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