The QIdentityProxyModel class proxies its source model unmodified 更多...
头: | #include <QIdentityProxyModel> |
qmake: | QT += core |
Since: | Qt 4.8 |
继承: | QAbstractProxyModel |
QIdentityProxyModel (QObject * parent = Q_NULLPTR) | |
~QIdentityProxyModel () |
virtual int | columnCount (const QModelIndex & parent = QModelIndex()) const |
virtual bool | dropMimeData (const QMimeData * data , Qt::DropAction action , int row , int column , const QModelIndex & parent ) |
virtual QVariant | headerData (int section , Qt::Orientation orientation , int role = Qt::DisplayRole) const |
virtual QModelIndex | index (int row , int column , const QModelIndex & parent = QModelIndex()) const |
virtual bool | insertColumns (int column , int count , const QModelIndex & parent = QModelIndex()) |
virtual bool | insertRows (int row , int count , const QModelIndex & parent = QModelIndex()) |
virtual QModelIndex | mapFromSource (const QModelIndex & sourceIndex ) const |
virtual QItemSelection | mapSelectionFromSource (const QItemSelection & selection ) const |
virtual QItemSelection | mapSelectionToSource (const QItemSelection & selection ) const |
virtual QModelIndex | mapToSource (const QModelIndex & proxyIndex ) const |
virtual QModelIndexList | match (const QModelIndex & start , int role , const QVariant & value , int hits = 1, Qt::MatchFlags flags = Qt::MatchFlags( Qt::MatchStartsWith | Qt::MatchWrap )) const |
virtual QModelIndex | parent (const QModelIndex & child ) const |
virtual bool | removeColumns (int column , int count , const QModelIndex & parent = QModelIndex()) |
virtual bool | removeRows (int row , int count , const QModelIndex & parent = QModelIndex()) |
virtual int | rowCount (const QModelIndex & parent = QModelIndex()) const |
virtual void | setSourceModel (QAbstractItemModel * newSourceModel ) |
virtual QModelIndex | sibling (int row , int column , const QModelIndex & idx ) const |
The QIdentityProxyModel class proxies its source model unmodified
QIdentityProxyModel can be used to forward the structure of a source model exactly, with no sorting, filtering or other transformation. This is similar in concept to an identity matrix where A.I = A.
Because it does no sorting or filtering, this class is most suitable to proxy models which transform the data () of the source model. For example, a proxy model could be created to define the font used, or the background colour, or the tooltip etc. This removes the need to implement all data handling in the same class that creates the structure of the model, and can also be used to create re-usable components.
This also provides a way to change the data in the case where a source model is supplied by a third party which can not be modified.
class DateFormatProxyModel : public QIdentityProxyModel { // ... void setDateFormatString(const QString &formatString) { m_formatString = formatString; } QVariant data(const QModelIndex &index, int role) const { if (role != Qt::DisplayRole) return QIdentityProxyModel::data(index, role); const QDateTime dateTime = sourceModel()->data(SourceClass::DateRole).toDateTime(); return dateTime.toString(m_formatString); } private: QString m_formatString; };
另请参阅 QAbstractProxyModel , 模型/视图编程 ,和 QAbstractItemModel .
Constructs an identity model with the given parent .
Destroys this identity model.
[虚拟]
int
QIdentityProxyModel::
columnCount
(const
QModelIndex
&
parent
= QModelIndex()) const
重实现自 QAbstractItemModel::columnCount ().
[虚拟]
bool
QIdentityProxyModel::
dropMimeData
(const
QMimeData
*
data
,
Qt::DropAction
action
,
int
row
,
int
column
, const
QModelIndex
&
parent
)
重实现自 QAbstractItemModel::dropMimeData ().
[虚拟]
QVariant
QIdentityProxyModel::
headerData
(
int
section
,
Qt::Orientation
orientation
,
int
role
= Qt::DisplayRole) const
重实现自 QAbstractItemModel::headerData ().
[虚拟]
QModelIndex
QIdentityProxyModel::
index
(
int
row
,
int
column
, const
QModelIndex
&
parent
= QModelIndex()) const
重实现自 QAbstractItemModel::index ().
[虚拟]
bool
QIdentityProxyModel::
insertColumns
(
int
column
,
int
count
, const
QModelIndex
&
parent
= QModelIndex())
重实现自 QAbstractItemModel::insertColumns ().
[虚拟]
bool
QIdentityProxyModel::
insertRows
(
int
row
,
int
count
, const
QModelIndex
&
parent
= QModelIndex())
重实现自 QAbstractItemModel::insertRows ().
[虚拟]
QModelIndex
QIdentityProxyModel::
mapFromSource
(const
QModelIndex
&
sourceIndex
) const
重实现自 QAbstractProxyModel::mapFromSource ().
[虚拟]
QItemSelection
QIdentityProxyModel::
mapSelectionFromSource
(const
QItemSelection
&
selection
) const
重实现自 QAbstractProxyModel::mapSelectionFromSource ().
[虚拟]
QItemSelection
QIdentityProxyModel::
mapSelectionToSource
(const
QItemSelection
&
selection
) const
重实现自 QAbstractProxyModel::mapSelectionToSource ().
[虚拟]
QModelIndex
QIdentityProxyModel::
mapToSource
(const
QModelIndex
&
proxyIndex
) const
重实现自 QAbstractProxyModel::mapToSource ().
[虚拟]
QModelIndexList
QIdentityProxyModel::
match
(const
QModelIndex
&
start
,
int
role
, const
QVariant
&
value
,
int
hits
= 1,
Qt::MatchFlags
flags
= Qt::MatchFlags( Qt::MatchStartsWith | Qt::MatchWrap )) const
重实现自 QAbstractItemModel::match ().
[虚拟]
QModelIndex
QIdentityProxyModel::
parent
(const
QModelIndex
&
child
) const
重实现自 QAbstractItemModel::parent ().
[虚拟]
bool
QIdentityProxyModel::
removeColumns
(
int
column
,
int
count
, const
QModelIndex
&
parent
= QModelIndex())
重实现自 QAbstractItemModel::removeColumns ().
[虚拟]
bool
QIdentityProxyModel::
removeRows
(
int
row
,
int
count
, const
QModelIndex
&
parent
= QModelIndex())
重实现自 QAbstractItemModel::removeRows ().
[虚拟]
int
QIdentityProxyModel::
rowCount
(const
QModelIndex
&
parent
= QModelIndex()) const
重实现自 QAbstractItemModel::rowCount ().
[虚拟]
void
QIdentityProxyModel::
setSourceModel
(
QAbstractItemModel
*
newSourceModel
)
重实现自 QAbstractProxyModel::setSourceModel ().
[虚拟]
QModelIndex
QIdentityProxyModel::
sibling
(
int
row
,
int
column
, const
QModelIndex
&
idx
) const
重实现自 QAbstractItemModel::sibling ().