TreeModel Class Reference

Detailed Description

A hierarchical model for a tree implemented as a double-linked list.

A hierarchical model for the pre-defined QTreeView included in QT. The tree as implemented as a double-linked list.

Definition at line 29 of file TreeModel.h.

#include <TreeModel.h>

Inheritance diagram for TreeModel:

Collaboration diagram for TreeModel:

Public Slots
void	updateData ()

Public Member Functions
	TreeModel (QObject *parent=nullptr)
	~TreeModel () override
QVariant	data (const QModelIndex &index, int role) const override
bool	setData (const QModelIndex &index, const QVariant &value, int role) override
Qt::ItemFlags	flags (const QModelIndex &index) const override
TreeItem *	getItem (const QModelIndex &index) const
QVariant	headerData (int section, Qt::Orientation orientation, int role=Qt::DisplayRole) const override
QModelIndex	index (int row, int column, const QModelIndex &parent=QModelIndex()) const override
QModelIndex	parent (const QModelIndex &index) const override
bool	removeRows (int position, int count, const QModelIndex &parent) override
int	rowCount (const QModelIndex &parent=QModelIndex()) const override
int	columnCount (const QModelIndex &parent=QModelIndex()) const override
TreeItem *	rootItem () const

Protected Attributes
TreeItem *	_rootItem

Private Member Functions
void	setupModelData (const QStringList &lines, TreeItem *parent)

Constructor & Destructor Documentation

TreeModel()

TreeModel::TreeModel ( QObject * parent = nullptr )

explicit

A model for the QTreeView implementing the tree as a double-linked list.

Definition at line 26 of file TreeModel.cpp.

                                    : QAbstractItemModel(parent)
{
    //_modelType = TREE_MODEL;
    QList<QVariant> rootData;
    rootData << "1"
             << "2"
             << "3";
    _rootItem = new TreeItem(rootData, nullptr);
    // setupModelData(data, _rootItem);
}

References _rootItem.

~TreeModel()

TreeModel::~TreeModel ( )

override

Definition at line 37 of file TreeModel.cpp.

{
    delete _rootItem;
}

References _rootItem.

Member Function Documentation

columnCount()

int TreeModel::columnCount ( const QModelIndex & parent = QModelIndex() ) const

override

Determines how many columns are present for a given model index.

Definition at line 127 of file TreeModel.cpp.

{
    if (parent.isValid())
    {
        return static_cast<TreeItem*>(parent.internalPointer())->columnCount();
    }
 
    return _rootItem->columnCount();
}

References _rootItem, TreeItem::columnCount(), columnCount(), and parent().

Referenced by columnCount().

data()

QVariant TreeModel::data ( const QModelIndex & index, int role ) const

override

Since each item manages its own columns, the column number is used to retrieve the data with the TreeItem::data() function

Definition at line 142 of file TreeModel.cpp.

{
    if (!index.isValid())
    {
        return QVariant();
    }
 
    if (role == Qt::EditRole || role == Qt::DisplayRole)
    {
        auto* item = static_cast<TreeItem*>(index.internalPointer());
 
        return item->data(index.column());
    }
 
    return QVariant();
}

References TreeItem::data(), and index().

Referenced by GeoTreeModel::removeGeoList(), StationTreeModel::vtkSource(), and GeoTreeModel::vtkSource().

flags()

Qt::ItemFlags TreeModel::flags ( const QModelIndex & index ) const

override

Definition at line 175 of file TreeModel.cpp.

{
    if (!index.isValid())
    {
        return Qt::NoItemFlags;
    }
 
    return Qt::ItemIsEnabled | Qt::ItemIsSelectable;
}

References index().

getItem()

TreeItem * TreeModel::getItem

(

const QModelIndex &

index

)

const

Returns the Item characterized by the given index.

Definition at line 188 of file TreeModel.cpp.

{
    if (index.isValid())
    {
        auto* item = static_cast<TreeItem*>(index.internalPointer());
        if (item)
        {
            return item;
        }
    }
    return _rootItem;
}

References _rootItem, and index().

Referenced by VtkAddFilterDialog::VtkAddFilterDialog(), VtkVisPipeline::addPipelineItem(), VtkVisPipeline::addPipelineItem(), MeshModel::getMesh(), VtkAddFilterDialog::on_buttonBox_accepted(), MeshModel::removeMesh(), removeRows(), VtkVisPipeline::removeSourceItem(), VtkVisPipeline::removeSourceItem(), VtkVisPipeline::removeSourceItem(), StationTreeModel::removeStationList(), and MeshModel::vtkSource().

headerData()

QVariant TreeModel::headerData ( int section, Qt::Orientation orientation, int role = Qt::DisplayRole ) const

override

Definition at line 201 of file TreeModel.cpp.

{
    if (orientation == Qt::Horizontal && role == Qt::DisplayRole)
    {
        return _rootItem->data(section);
    }
 
    return QVariant();
}

References _rootItem, and TreeItem::data().

index()

QModelIndex TreeModel::index ( int row, int column, const QModelIndex & parent = QModelIndex() ) const

override

Returns the index of a TreeItem given its parent and position. It is first checked if the model index is valid. If it is not, it is assumed that a top-level item is being referred to; otherwise, the data pointer from the model index is obtained with its internalPointer() function and is used to reference a TreeItem object

Parameters

row	Row of the tree object
column	Column of the tree object
parent	Index of the parent object

Definition at line 50 of file TreeModel.cpp.

{
    if (!hasIndex(row, column, parent))
    {
        return QModelIndex();
    }
 
    TreeItem* parentItem;
 
    if (!parent.isValid())
    {
        parentItem = _rootItem;
    }
    else
    {
        parentItem = static_cast<TreeItem*>(parent.internalPointer());
    }
 
    TreeItem* childItem = parentItem->child(row);
    if (childItem)
    {
        return createIndex(row, column, childItem);
    }
 
    return QModelIndex();
}

References _rootItem, TreeItem::child(), and parent().

Referenced by AddFaultsToVoxelGridDialog::AddFaultsToVoxelGridDialog(), Layers2GridDialog::Layers2GridDialog(), TranslateDataDialog::TranslateDataDialog(), Vtu2GridDialog::Vtu2GridDialog(), MeshModel::addMeshObject(), VtkVisPipeline::addPipelineItem(), data(), flags(), VtkVisPipeline::flags(), getItem(), VtkVisPipeline::highlightGeoObject(), VtkVisPipeline::highlightMeshComponent(), parent(), GeoTreeModel::removeGeoList(), MeshModel::removeMesh(), VtkVisPipeline::removePipelineItem(), VtkVisPipeline::removeSourceItem(), VtkVisPipeline::removeSourceItem(), VtkVisPipeline::removeSourceItem(), setData(), VtkVisPipeline::setData(), and MeshModel::updateMesh().

parent()

QModelIndex TreeModel::parent ( const QModelIndex & index ) const

override

Returns the model index of a TreeItem based on its index.

Definition at line 81 of file TreeModel.cpp.

{
    if (!index.isValid())
    {
        return QModelIndex();
    }
 
    auto* childItem = static_cast<TreeItem*>(index.internalPointer());
    TreeItem* parentItem = childItem->parentItem();
 
    if (parentItem == _rootItem)
    {
        return QModelIndex();
    }
 
    return createIndex(parentItem->row(), 0, parentItem);
}

References _rootItem, index(), TreeItem::parentItem(), and TreeItem::row().

Referenced by ProcessModel::addConditionItem(), VtkVisPipeline::addPipelineItem(), VtkVisPipeline::addPipelineItem(), GeoTreeModel::appendPolylines(), GeoTreeModel::appendSurfaces(), columnCount(), MeshModel::columnCount(), ProcessModel::columnCount(), index(), StationTreeModel::index(), GeoTreeModel::removeGeoList(), removeRows(), StationTreeModel::removeStationList(), rowCount(), and setupModelData().

removeRows()

bool TreeModel::removeRows ( int position, int count, const QModelIndex & parent )

override

Removes item from the model.

Definition at line 215 of file TreeModel.cpp.

{
    TreeItem* parentItem = getItem(parent);
    bool success = true;
 
    beginRemoveRows(parent, position, position + count - 1);
    success = parentItem->removeChildren(position, count);
    endRemoveRows();
 
    return success;
}

References getItem(), parent(), and TreeItem::removeChildren().

Referenced by GeoTreeModel::removeGeoList(), VtkVisPipeline::removePipelineItem(), and StationTreeModel::removeStationList().

rootItem()

TreeItem * TreeModel::rootItem

(

)

const

Definition at line 294 of file TreeModel.cpp.

{
    return _rootItem;
}

References _rootItem.

Referenced by TreeModelIterator::TreeModelIterator(), and TreeModelIterator::next().

rowCount()

int TreeModel::rowCount ( const QModelIndex & parent = QModelIndex() ) const

override

Returns the number of child items for the TreeItem that corresponds to a given model index, or the number of top-level items if an invalid index is specified.

Definition at line 104 of file TreeModel.cpp.

{
    TreeItem* parentItem;
    if (parent.column() > 0)
    {
        return 0;
    }
 
    if (!parent.isValid())
    {
        parentItem = _rootItem;
    }
    else
    {
        parentItem = static_cast<TreeItem*>(parent.internalPointer());
    }
 
    return parentItem->childCount();
}

References _rootItem, TreeItem::childCount(), and parent().

Referenced by AddFaultsToVoxelGridDialog::AddFaultsToVoxelGridDialog(), Layers2GridDialog::Layers2GridDialog(), TranslateDataDialog::TranslateDataDialog(), Vtu2GridDialog::Vtu2GridDialog(), and StationTreeModel::addStationList().

setData()

bool TreeModel::setData ( const QModelIndex & index, const QVariant & value, int role )

override

Definition at line 159 of file TreeModel.cpp.

{
    if (!index.isValid())
    {
        return false;
    }
 
    if (role == Qt::EditRole)
    {
        auto* item = static_cast<TreeItem*>(index.internalPointer());
        item->setData(index.column(), value);
        return true;
    }
    return false;
}

References index(), and TreeItem::setData().

Referenced by VtkVisPipeline::setData().

setupModelData()

void TreeModel::setupModelData ( const QStringList & lines, TreeItem * parent )

private

Test method for creating a tree model

Definition at line 230 of file TreeModel.cpp.

{
    QList<TreeItem*> parents;
    QList<int> indentations;
    parents << parent;
    indentations << 0;
 
    int number = 0;
 
    while (number < lines.count())
    {
        int position = 0;
        while (position < lines[number].length())
        {
            if (lines[number].mid(position, 1) != " ")
            {
                break;
            }
            position++;
        }
 
        QString lineData = lines[number].mid(position).trimmed();
 
        if (!lineData.isEmpty())
        {
            // Read the column data from the rest of the line.
            QStringList columnStrings =
                lineData.split("\t", Qt::SkipEmptyParts);
            QList<QVariant> columnData;
            for (int column = 0; column < columnStrings.count(); ++column)
            {
                columnData << columnStrings[column];
            }
 
            if (position > indentations.last())
            {
                // The last child of the current parent is now the new parent
                // unless the current parent has no children.
 
                if (parents.last()->childCount() > 0)
                {
                    parents << parents.last()->child(
                        parents.last()->childCount() - 1);
                    indentations << position;
                }
            }
            else
            {
                while (position < indentations.last() && parents.count() > 0)
                {
                    parents.pop_back();
                    indentations.pop_back();
                }
            }
 
            // Append a new item to the current parent's list of children.
            parents.last()->appendChild(
                new TreeItem(columnData, parents.last()));
        }
 
        number++;
    }
}

References parent().

updateData

void TreeModel::updateData ( )

slot

Definition at line 137 of file TreeModel.cpp.

{}

Member Data Documentation

_rootItem

TreeItem* TreeModel::_rootItem

protected

Definition at line 58 of file TreeModel.h.

Referenced by ElementTreeModel::ElementTreeModel(), FemConditionModel::FemConditionModel(), GeoTreeModel::GeoTreeModel(), MeshModel::MeshModel(), ProcessModel::ProcessModel(), StationTreeModel::StationTreeModel(), TreeModel(), VtkVisPipeline::VtkVisPipeline(), ~TreeModel(), MeshModel::addMeshObject(), VtkVisPipeline::addPipelineItem(), GeoTreeModel::addPointList(), GeoTreeModel::addPolylineList(), ProcessModel::addProcessVar(), StationTreeModel::addStationList(), GeoTreeModel::addSurfaceList(), ProcessModel::clearModel(), ElementTreeModel::clearView(), FemConditionModel::clearView(), columnCount(), getItem(), MeshModel::getMesh(), ProcessModel::getProcessVarItem(), headerData(), VtkVisPipeline::highlightGeoObject(), VtkVisPipeline::highlightMeshComponent(), index(), StationTreeModel::index(), parent(), MeshModel::removeMesh(), ProcessModel::removeProcessVariable(), VtkVisPipeline::removeSourceItem(), VtkVisPipeline::removeSourceItem(), VtkVisPipeline::removeSourceItem(), rootItem(), rowCount(), ElementTreeModel::setElement(), FemConditionModel::setFemCondition(), VtkVisPipeline::setGlobalBackfaceCulling(), VtkVisPipeline::setGlobalSuperelevation(), ElementTreeModel::setMesh(), FemConditionModel::setProcessVariable(), VtkVisPipeline::showMeshElementQuality(), MeshModel::updateMesh(), and MeshModel::vtkSource().

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

• Applications/DataExplorer/Base/TreeModel.h
• Applications/DataExplorer/Base/TreeModel.cpp