快捷键支持：

CTRL+鼠标滚轮实现字体大小调整

支持复制当前行

剪切当前行

# 多行文本框
class TextEdit(QTextEdit):def __init__(self, parent=None):super().__init__(parent)self.setStyleSheet("background-color: #262626;color: #d0d0d0;")self.setFont(standard_font)  # 设置标准字体# Ctrl+鼠标滚轮调整字体大小def wheelEvent(self, event):# 捕捉鼠标滚轮事件modifiers = QApplication.keyboardModifiers()if modifiers == Qt.ControlModifier:# 如果按下了 Ctrl 键delta = event.angleDelta().y()font = self.font()# 根据滚轮方向调整字体大小if delta > 0:font.setPointSize(font.pointSize() + 1)else:font.setPointSize(font.pointSize() - 1)self.setFont(font)else:# 如果没有按下 Ctrl 键，则使用默认滚轮事件处理super().wheelEvent(event)# Ctrl+X,Ctrl+Cdef keyPressEvent(self, event):if event.modifiers() == Qt.ControlModifier and event.key() == Qt.Key_X:if self.textCursor().hasSelection():# If there is selected text, cut the selectionsuper().keyPressEvent(event)else:# If no text is selected, cut the entire lineself.cut_current_line()elif event.modifiers() == Qt.ControlModifier and event.key() == Qt.Key_C:if self.textCursor().hasSelection():# If there is selected text, cut the selectionsuper().keyPressEvent(event)else:# If no text is selected, cut the entire lineself.copy_current_line()else:super().keyPressEvent(event)# 剪切当前行内容def cut_current_line(self):cursor = self.textCursor()cursor.movePosition(QTextCursor.StartOfLine)cursor.movePosition(QTextCursor.EndOfLine, QTextCursor.KeepAnchor)self.setTextCursor(cursor)self.cut()# 复制当前行内容def copy_current_line(self):cursor = self.textCursor()cursor.movePosition(QTextCursor.StartOfLine)cursor.movePosition(QTextCursor.EndOfLine, QTextCursor.KeepAnchor)self.setTextCursor(cursor)self.copy()