/** Create sorted view, with some properties sorted in reverse
*
* The result is virtual, it merely maintains a permutation to access the
* underlying view. This "derived" view uses change notification to track
* changes to the underlying view, but unfortunately there are some major
* limitations with this scheme - one of them being that deriving another
* view from this sorted one will not properly track changes.
*/
c4_View c4_View::SortOnReverse(const c4_View &up_,
///< the view which defines the sort order
const c4_View &down_ ///< subset of up_, defines reverse order
)const {
c4_Sequence *seq = f4_CreateProject(*_seq, *up_._seq, true);
return f4_CreateSort(*seq, down_._seq);
}
/** Create derived view with some properties omitted
*
* The result is virtual, it merely maintains a permutation to access the
* underlying view. This "derived" view uses change notification to track
* changes to the underlying view, but this only works when based on views
* which properly generate change notifications (.e. raw views, selections,
* and other projections).
*/
c4_View c4_View::ProjectWithout(const c4_View& out_) const
{
return f4_CreateProject(*_seq, *_seq, false, out_._seq);
}
/** Create view with the specified property arrangement
*
* The result is virtual, it merely maintains a permutation to access the
* underlying view. This "derived" view uses change notification to track
* changes to the underlying view, but this only works when based on views
* which properly generate change notifications (.e. raw views, selections,
* and other projections).
*/
c4_View c4_View::Project(const c4_View& in_) const
{
return f4_CreateProject(*_seq, *in_._seq, false);
}
/** Create view sorted according to the specified properties
*
* The result is virtual, it merely maintains a permutation to access the
* underlying view. This "derived" view uses change notification to track
* changes to the underlying view, but unfortunately there are some major
* limitations with this scheme - one of them being that deriving another
* view from this sorted one will not properly track changes.
*/
c4_View c4_View::SortOn(const c4_View& up_) const
{
c4_Sequence* seq = f4_CreateProject(*_seq, *up_._seq, true);
return f4_CreateSort(*seq);
}
