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54 lines
1.7 KiB
Python
54 lines
1.7 KiB
Python
import sys
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from PySide6 import QtCore, QtWidgets
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"""
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QPlainText 案例：显示行号
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每当文本文档需要更新显示矩形时，会发射updateRequest信号，垂直滚动量作为参数传出
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利用这个信号，可以编写行号、断点等功能
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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("QPlainTextEdit-显示行号")
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self.resize(800, 600)
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self.setup_ui()
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self.show_line_num()
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def setup_ui(self) -> None:
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"""设置界面"""
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self.pte = QtWidgets.QPlainTextEdit(self)
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self.pte.resize(350, 400)
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self.pte.move(150, 80)
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self.pte.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOn) # 始终显示滚动条
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# 用于限制line_num_label位置尺寸的父控件
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line_num_widget = QtWidgets.QWidget(self)
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line_num_widget.resize(30, 400)
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line_num_widget.move(120, 80)
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self.line_num_label = QtWidgets.QLabel(line_num_widget)
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self.line_num_label.move(0, 5) # 微调，视觉上对齐
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line_nums = "\n".join([str(i) for i in range(1, 101)]) # 生成行号文本
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self.line_num_label.setText(line_nums)
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def show_line_num(self) -> None:
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"""显示行号"""
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@QtCore.Slot(QtCore.QRect, int)
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def scroll_line_num(_, dy: int): # 用_表示仅占位而不会用到的参数
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self.line_num_label.move(self.line_num_label.x(), self.line_num_label.y() + dy)
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self.pte.updateRequest.connect(scroll_line_num) # 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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