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https://github.com/muziing/PySide6-Code-Tutorial.git
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91 lines
4.4 KiB
Python
91 lines
4.4 KiB
Python
import sys
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from PySide6 import QtCore, QtGui, QtWidgets
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"""
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QPlainTextEdit 信号
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纯文本编辑器提供了许多可用信号
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.textChanged() 当文档的内容发生变化时发射此信号。例如文本插入删除或应用格式等
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.selectionChanged() 当选中改变时发射此信号
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.blockCountChanged(new_block_count: int) 当文档中块的数量发生变化时发射此信号，新的块数量作为参数传出
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.cursorPositionChanged() 当光标位置改变时发射此信号
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.copyAvailable(yes: bool) 当复制功能可用状态发生变化时发射此信号，可用状态作为参数传出
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.undoAvailable(available: bool) 当撤销功能可用状态发生变化时发射此信号，可用状态作为参数传出
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.redoAvailable(available: bool) 当重做功能可用状态发生变化时发射此信号，可用状态作为参数传出
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.updateRequest(rect: QRect, dy: int) 当文本文档需要更新指定的矩形时发射此信号。详情见下一节的案例
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.modificationChanged(changed: bool) 当文档的内容以影响修改状态的方式发生变化时发射此信号，文档是否已被修改作为参数传出
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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-信号")
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self.resize(800, 600)
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self.pte = QtWidgets.QPlainTextEdit()
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self.info_label = QtWidgets.QLabel()
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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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self.pte.resize(600, 450)
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clear_button = QtWidgets.QPushButton("清空")
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copy_button = QtWidgets.QPushButton("复制")
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undo_button = QtWidgets.QPushButton("撤销")
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redo_button = QtWidgets.QPushButton("重做")
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undo_redo_enable_checkbox = QtWidgets.QCheckBox("允许撤销/重做")
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undo_redo_enable_checkbox.setChecked(True)
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@QtCore.Slot(bool)
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def undo_redo_enable_test(enable: bool):
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"""测试禁用撤销/重做功能"""
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self.pte.setUndoRedoEnabled(enable)
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print(f"pte.isUndoRedoEnabled({self.pte.isUndoRedoEnabled()})")
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undo_redo_enable_checkbox.toggled.connect(undo_redo_enable_test) # type: ignore
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clear_button.clicked.connect(self.pte.clear) # type: ignore
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copy_button.clicked.connect(self.pte.copy) # type: ignore
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undo_button.clicked.connect(self.pte.undo) # type: ignore
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redo_button.clicked.connect(self.pte.redo) # type: ignore
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# 将按钮通过布局管理器放在组框中，首次学习可忽略本段代码
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button_groupbox = QtWidgets.QGroupBox()
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layout = QtWidgets.QVBoxLayout(button_groupbox)
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layout.addWidget(clear_button)
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layout.addWidget(copy_button)
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layout.addWidget(undo_redo_enable_checkbox)
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layout.addWidget(undo_button)
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layout.addWidget(redo_button)
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layout.addWidget(self.info_label)
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button_groupbox.setLayout(layout)
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main_layout = QtWidgets.QHBoxLayout(self)
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main_layout.addWidget(self.pte)
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main_layout.addWidget(button_groupbox)
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self.setLayout(main_layout)
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def signal_test(self) -> None:
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# 测试信号时为避免干扰，每次只测试一个，注释掉其他
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self.pte.textChanged.connect(lambda: self.info_label.setText("文本改变了！")) # type: ignore
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# self.pte.selectionChanged.connect(lambda: self.info_label.setText("选中内容改变了！")) # type: ignore
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# self.pte.blockCountChanged.connect(
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# lambda new_block_count: self.info_label.setText(f"块数量变成了{new_block_count}")
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# ) # type: ignore
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# self.pte.cursorPositionChanged.connect(lambda: self.info_label.setText("光标位置改变了！")) # type: ignore
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# self.pte.copyAvailable.connect(lambda yes: self.info_label.setText(f"复制可用状态变为了{yes}！")) # type: ignore
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# self.pte.undoAvailable.connect(lambda yes: self.info_label.setText(f"撤销可用状态变为了{yes}！")) # type: ignore
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# self.pte.redoAvailable.connect(lambda yes: self.info_label.setText(f"重做可用状态变为了{yes}！")) # 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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