1.创建事件过滤器类，在主窗口中安装事件过滤器

class PasteFilter : public QObject {     Q_OBJECT  public:     PasteFilter(QObject *parent = nullptr) : QObject(parent) {}  protected:     bool eventFilter(QObject *obj, QEvent *event) override {         if (event->type() == QEvent::KeyPress) {             QKeyEvent *keyEvent = static_cast(event);             if (keyEvent->modifiers() == Qt::ControlModifier && keyEvent->key() == Qt::Key_V) {                 QTextEdit *textEdit = qobject_cast(obj);                 if (textEdit) {                     QClipboard *clipboard = QApplication::clipboard();                     QString clipboardText = clipboard->text();                     QString quotedText = "\"" + clipboardText + "\"";                     QTextCursor cursor = textEdit->textCursor();                     cursor.insertText(quotedText);                     return true;                 }             }         }         return QObject::eventFilter(obj, event);     } };        PasteFilter *pasteFilter = new PasteFilter(this);     ui->textEdit->installEventFilter(pasteFilter);

2. 自定义控件，重写控件的event事件

    void keyPressEvent(QKeyEvent *event) override {         if (event->modifiers() == Qt::ControlModifier && event->key() == Qt::Key_V) {             // 捕获 Ctrl+V 事件             QClipboard *clipboard = QApplication::clipboard();             QString originalText = clipboard->text();             QString quotedText = "\"" + originalText + "\"";              // 插入带引号的文本             this->insertPlainText(quotedText);         } else {             // 调用基类的方法处理其他按键事件             QTextEdit::keyPressEvent(event);         }     }