QRangeModel::ItemAccess< T > Class Template Reference

\inmodule QtCore More...

#include <qrangemodel.h>

Inheritance diagram for QRangeModel::ItemAccess< T >:

Collaboration diagram for QRangeModel::ItemAccess< T >:

Detailed Description

template<typename T>
class QRangeModel::ItemAccess< T >

\inmodule QtCore

The ItemAccess template provides a customization point to control how QRangeModel accesses role data of individual items.

Since

6.11

ItemAccess<T> is a struct template where T specifies the item type. Specialize this template for the type used in your data structure, and implement {readRole()} and (optionally since 6.12) {writeRole()} members to access the role-specific data of your type.

template <>
struct QRangeModel::ItemAccess<ItemType>
{
    static QVariant readRole(const ItemType &item, int role)
    {
        switch (role) {
            // ...
        }
        return {};
    }
 
    static bool writeRole(ItemType &item, const QVariant &data, int role)
    {
        bool ok = false;
        switch (role) {
            // ...
        }
 
        return ok;
    }
};

Optionally [since 6.12], a {flags()} implementation can return a combination of Qt::ItemFlags:

static Qt::ItemFlags flags(const ItemType &item)
{
    return item.flags();
}

A specialization of this type will take precedence over any predefined behavior. Do not specialize this template for types you do not own. Types for which ItemAccess is specialized with a {readRole} implementation are implicitly interpreted as \l{RowCategory}{multi-role items}.

Definition at line 41 of file qrangemodel.h.

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The documentation for this class was generated from the following file:

• qtbase/src/corelib/itemmodels/qrangemodel.h (e4c9e553f6530e0004606548dc18a4d342439fad)