在Qt中QTextEdit右键标准菜单操作

// 定义右键标准菜单
QMenu *textEditMenu = new QMenu(ui->textEdit);

// 添加自定义功能选项
QAction *customAction = new QAction("Custom Action", this);
textEditMenu->addAction(customAction);

// 添加分割线
textEditMenu->addSeparator();

// 添加复制、剪切、粘贴等自带的Action
QAction *copyAction = textEditMenu->addAction(QIcon(), "Copy");
QAction *cutAction = textEditMenu->addAction(QIcon(), "Cut");
QAction *pasteAction = textEditMenu->addAction(QIcon(), "Paste");
QAction *selectAllAction = textEditMenu->addAction(QIcon(), "Select All");
QAction *deleteAction = textEditMenu->addAction(QIcon(), "Delete");
QAction *redoAction = textEditMenu->addAction(QIcon(), "Redo");
QAction *undoAction = textEditMenu->addAction(QIcon(), "Undo");

// 设置菜单为自定义右键菜单
ui->textEdit->setContextMenuPolicy(Qt::CustomContextMenu);

// 将自定义右键菜单设置为QTextEdit的右键标准菜单
ui->textEdit->setContextMenu(textEditMenu);

// 监听copyAvailable()信号，当有文本被选中时将相关的Action设置为setEnabled(true)
connect(ui->textEdit, &QTextEdit::copyAvailable, this, [=](bool available){
    copyAction->setEnabled(available);
    cutAction->setEnabled(available);
    deleteAction->setEnabled(available);
});

// 处理自带Action的操作
connect(copyAction, &QAction::triggered, ui->textEdit, &QTextEdit::copy);
connect(cutAction, &QAction::triggered, ui->textEdit, &QTextEdit::cut);
connect(pasteAction, &QAction::triggered, ui->textEdit, &QTextEdit::paste);
connect(selectAllAction, &QAction::triggered, ui->textEdit, &QTextEdit::selectAll);
connect(deleteAction, &QAction::triggered, ui->textEdit, &QTextEdit::cut);
connect(redoAction, &QAction::triggered, ui->textEdit, &QTextEdit::redo);
connect(undoAction, &QAction::triggered, ui->textEdit, &QTextEdit::undo);