QStandardItem + QComboBox

Question

我试图把QComboBox成QStandardItem在使用QStandardItemModel.我一直在四处寻找,我找不到答案,任何想法？

Answer 1

你不存储QComboBoxa QStandardItemModel.假设您有以下选择:

A B C D

你有一个列表中有两个项目QListView,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,到了QComboBox.我假设你想要编辑列表中"A"和"D"的值.为此,您需要创建一个QItemDelegate.

请参见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);
}

然后你需要在其上设置委托QListView以使其工作,请参阅:

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