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Code Issues Releases Wiki Activity

Implement canFetchMore and fetchMore in MergedProxyModel

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This commit is contained in:
David Sansome 2010-05-11 18:01:30 +00:00
parent ff4eb346da
commit 51446cbb88
2 changed files with 45 additions and 13 deletions
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47
src/core/mergedproxymodel.cpp
View File

@ -44,7 +44,7 @@ void MergedProxyModel::DeleteAllMappings() {
}
void MergedProxyModel::AddSubModel(const QModelIndex& source_parent,
const QAbstractItemModel* submodel) {
QAbstractItemModel* submodel) {
merge_points_.insert(submodel, source_parent);
connect(submodel, SIGNAL(modelReset()), this, SLOT(SubModelReset()));
@ -97,7 +97,7 @@ void MergedProxyModel::SourceModelReset() {
}
void MergedProxyModel::SubModelReset() {
const QAbstractItemModel* submodel = static_cast<const QAbstractItemModel*>(sender());
QAbstractItemModel* submodel = static_cast<QAbstractItemModel*>(sender());
// TODO: When we require Qt 4.6, use beginResetModel() and endResetModel()
// in LibraryModel and catch those here - that will let us do away with this
@ -136,7 +136,7 @@ void MergedProxyModel::SubModelReset() {
}
QModelIndex MergedProxyModel::GetActualSourceParent(const QModelIndex& source_parent,
const QAbstractItemModel* model) const {
QAbstractItemModel* model) const {
if (!source_parent.isValid() && model != sourceModel())
return merge_points_.value(model);
return source_parent;
@ -145,7 +145,7 @@ QModelIndex MergedProxyModel::GetActualSourceParent(const QModelIndex& source_pa
void MergedProxyModel::RowsAboutToBeInserted(const QModelIndex& source_parent,
int start, int end) {
beginInsertRows(mapFromSource(GetActualSourceParent(
source_parent, static_cast<const QAbstractItemModel*>(sender()))),
source_parent, static_cast<QAbstractItemModel*>(sender()))),
start, end);
}
@ -156,7 +156,7 @@ void MergedProxyModel::RowsInserted(const QModelIndex&, int, int) {
void MergedProxyModel::RowsAboutToBeRemoved(const QModelIndex& source_parent,
int start, int end) {
beginRemoveRows(mapFromSource(GetActualSourceParent(
source_parent, static_cast<const QAbstractItemModel*>(sender()))),
source_parent, static_cast<QAbstractItemModel*>(sender()))),
start, end);
}
@ -222,7 +222,7 @@ QModelIndex MergedProxyModel::parent(const QModelIndex &child) const {
return mapFromSource(source_child.parent());
if (!source_child.parent().isValid())
return mapFromSource(merge_points_.value(source_child.model()));
return mapFromSource(merge_points_.value(GetModel(source_child)));
return mapFromSource(source_child.parent());
}
@ -294,8 +294,7 @@ bool MergedProxyModel::setData(const QModelIndex &index, const QVariant &value,
if (!source_index.isValid())
return sourceModel()->setData(index, value, role);
return const_cast<QAbstractItemModel*>(source_index.model())->
setData(index, value, role);
return GetModel(index)->setData(index, value, role);
}
QStringList MergedProxyModel::mimeTypes() const {
@ -336,5 +335,35 @@ QModelIndex MergedProxyModel::FindSourceParent(const QModelIndex& proxy_index) c
QModelIndex source_index = mapToSource(proxy_index);
if (source_index.model() == sourceModel())
return source_index;
return merge_points_.value(source_index.model());
return merge_points_.value(GetModel(source_index));
}
bool MergedProxyModel::canFetchMore(const QModelIndex &parent) const {
QModelIndex source_index = mapToSource(parent);
if (!source_index.isValid())
return sourceModel()->canFetchMore(QModelIndex());
return source_index.model()->canFetchMore(source_index);
}
void MergedProxyModel::fetchMore(const QModelIndex& parent) {
QModelIndex source_index = mapToSource(parent);
if (!source_index.isValid())
sourceModel()->fetchMore(QModelIndex());
else
GetModel(source_index)->fetchMore(source_index);
}
QAbstractItemModel* MergedProxyModel::GetModel(const QModelIndex& source_index) const {
// This is essentially const_cast<QAbstractItemModel*>(source_index.model()),
// but without the const_cast
const QAbstractItemModel* const_model = source_index.model();
if (const_model == sourceModel())
return sourceModel();
foreach (QAbstractItemModel* submodel, merge_points_.keys()) {
if (submodel == const_model)
return submodel;
}
return NULL;
}

11
src/core/mergedproxymodel.h
View File

@ -42,7 +42,7 @@ class MergedProxyModel : public QAbstractProxyModel {
~MergedProxyModel();
// Make another model appear as a child of the given item in the source model.
void AddSubModel(const QModelIndex& source_parent, const QAbstractItemModel* submodel);
void AddSubModel(const QModelIndex& source_parent, QAbstractItemModel* submodel);
// Find the item in the source model that is the parent of the model
// containing proxy_index. If proxy_index is in the source model, then
@ -61,6 +61,8 @@ class MergedProxyModel : public QAbstractProxyModel {
bool setData(const QModelIndex &index, const QVariant &value, int role);
QStringList mimeTypes() const;
QMimeData* mimeData(const QModelIndexList &indexes) const;
bool canFetchMore(const QModelIndex &parent) const;
void fetchMore(const QModelIndex& parent);
// QAbstractProxyModel
// Note that these implementations of map{To,From}Source will not always
@ -81,7 +83,8 @@ class MergedProxyModel : public QAbstractProxyModel {
private:
QModelIndex GetActualSourceParent(const QModelIndex& source_parent,
const QAbstractItemModel* model) const;
QAbstractItemModel* model) const;
QAbstractItemModel* GetModel(const QModelIndex& source_index) const;
void DeleteAllMappings();
struct Mapping {
@ -104,8 +107,8 @@ class MergedProxyModel : public QAbstractProxyModel {
> MappingContainer;
MappingContainer mappings_;
QMap<const QAbstractItemModel*, QModelIndex> merge_points_;
const QAbstractItemModel* resetting_model_;
QMap<QAbstractItemModel*, QModelIndex> merge_points_;
QAbstractItemModel* resetting_model_;
};
#endif // MERGEDPROXYMODEL_H