qt - QStandardItem + QComboBox

Question

我想把 QComboBox变成 QStandardItem用于 QStandardItemModel .我一直在环顾四周，我找不到答案，有什么想法吗？

Answer 1

您不存储 QComboBox在 QStandardItemModel .假设您有以下选择:

一种
乙
C
D

并且您有一个列表，其中包含两个项目 QListView ，第一个值为 A，第二个值为 D:

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

我们在上面创建的是一个列表小部件，它将显示“A”和“D”的值。现在，到QComboBox .我假设您希望编辑列表中“A”和“D”的值。为此，您需要创建一个 QItemDelegate .

见 http://doc.qt.io/qt-4.8/qitemdelegate.html

一次尝试:

 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(delegate)要使其工作，请参阅:

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