QStandardItem + QComboBox

Question

我正在尝试将QComboBox放入QStandardItem以用于QStandardItemModel。我一直在四处寻找，我找不到答案，任何想法？

Answer 1

您不会在QComboBox中存储QStandardItemModel。假设您有以下选择：

一个 乙 C d

你有QListView中有两个项目的列表，第一个值是A，第二个是D：

 QListView* pView = new QListView();
 QStandardItemModel* pModel = new QStandardItemModel();
 pView->setModel(pModel);
 pModel->appendRow(new QStandardItem("A"));
 pModel->appendRow(new QStandardItem("D"));

我们上面创建的是一个列表小部件，它将显示“A”和“D”的值。现在，转到QComboBox。我假设你想要编辑列表中“A”和“D”的值。为此，您需要创建QItemDelegate。

请参阅http://doc.qt.io/qt-4.8/qitemdelegate.html

尝试：

 class ComboBoxDelegate : public QItemDelegate
 {
    Q_OBJECT

 public:
    ComboBoxDelegate(QObject *parent = 0);

    QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option,
                       const QModelIndex &index) const;

    void setEditorData(QWidget *editor, const QModelIndex &index) const;
    void setModelData(QWidget *editor, QAbstractItemModel *model,
                   const QModelIndex &index) const;

    void updateEditorGeometry(QWidget *editor,
     const QStyleOptionViewItem &option, const QModelIndex &index) const;
};

ComboBoxDelegate::ComboBoxDelegate(QObject *parent)
 : QItemDelegate(parent)
{
}

QWidget *ComboBoxDelegate::createEditor(QWidget *parent,
 const QStyleOptionViewItem &/* option */,
 const QModelIndex &/* index */) const
{
   QComboBox *editor = new QComboBox(parent);
   editor->addItem("A");
   editor->addItem("B");
   editor->addItem("C");
   editor->addItem("D");

   return editor;
}

void ComboBoxDelegate::setEditorData(QWidget *editor,
                                 const QModelIndex &index) const
{
   QString value = index.model()->data(index, Qt::EditRole).toString();

   QComboBox *cBox = static_cast<QComboBox*>(editor);
   cBox->setCurrentIndex(cBox->findText(value));
}

void ComboBoxDelegate::setModelData(QWidget *editor, QAbstractItemModel *model,
                                const QModelIndex &index) const
{
   QComboBox *cBox = static_cast<QComboBox*>(editor);
   QString value = cBox->currentText();

   model->setData(index, value, Qt::EditRole);
}    

void ComboBoxDelegate::updateEditorGeometry(QWidget *editor,
 const QStyleOptionViewItem &option, const QModelIndex &/* index */) const
{
   editor->setGeometry(option.rect);
}

然后您需要在QListView上设置委托以使其正常工作，请参阅：

pView->setItemDelegate(new ComboBoxDelegate(pView));