如何在QTableWidget中进入单元格编辑时弹出QCompleter

Question

我有一个带有自定义 QStyledItemDelegate 的 QTableWidget，在单元格编辑中输入时，我想弹出一个完成器，但它没有出现。

委托设置：

tableWidget.setItemDelegate(new DelegateLineEdit());

我的习惯class:

class DelegateLineEdit : public QStyledItemDelegate
{
public:
    DelegateLineEdit() {
        signs << "<" << "<=" << ">" << ">=" << "=";
    }
    ~DelegateLineEdit(){ }
    QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const {
        QLineEdit *line_edit = new QLineEdit(parent);
        line_edit->setStyle(parent->style());
        line_edit->setFocusPolicy(Qt::StrongFocus);
        QCompleter *completer = new QCompleter(signs, line_edit);
        completer->setCompletionMode(QCompleter::UnfilteredPopupCompletion);
        line_edit->setCompleter(completer);
        return line_edit;
    }
    void setEditorData(QWidget *editor, const QModelIndex &index) const {
        QStyledItemDelegate::setEditorData(editor, index);
        QLineEdit *line_edit = dynamic_cast<QLineEdit*>(editor);
        if (line_edit){
            line_edit->completer()->complete();
        }
    }

private:
    QStringList signs;

};

当我双击进入单元格编辑时，没有任何反应，但如果我注释该行
line_edit->completer()->complete()，我可以编辑单元格，但未显示完成。有人有想法吗？

Answer 1

我认为像completer->popup()->show();这样的东西应该做你想做的或者试着像

那样调用

QCompleter::setCompletionPrefix(index.data(Qt::EditRole).tostring());

和

QCompleter::complete();

Answer 2

我会尝试使用 QLineEdit 子类作为编辑器，其中 focusInEvent 被覆盖以显示弹出窗口：

class LineEdit : public QLineEdit
{
public:
  explicit LineEdit(QWidget*parent) : QLineEdit(parent){}
protected:
  void focusInEvent(QFocusEvent * e)
  {
    QLineEdit::focusInEvent(e);
    completer()->complete();
  }
};

代表变成：

class DelegateLineEdit : public QStyledItemDelegate
{
public:
    DelegateLineEdit() {
        signs << "<" << "<=" << ">" << ">=" << "=";
    }
    ~DelegateLineEdit(){ }
    QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const {

//use the subclass instead of QLineEdit:
        LineEdit *line_edit = new LineEdit(parent);

        line_edit->setStyle(parent->style());
        line_edit->setFocusPolicy(Qt::StrongFocus);
        QCompleter *completer = new QCompleter(signs, line_edit);
        completer->setCompletionMode(QCompleter::UnfilteredPopupCompletion);
        line_edit->setCompleter(completer);
        return line_edit;
    }

private:
    QStringList signs;

};

如何在QTableWidget中进入单元格编辑时弹出QCompleter

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