model.cpp Example File

itemviews/interview/model.cpp
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#include "model.h" #include <QIcon> #include <QPixmap> Model::Model(int rows, int columns, QObject *parent) : QAbstractItemModel(parent), services(QPixmap(":/images/services.png")), rc(rows), cc(columns), tree(new QVector<Node>(rows, Node(0))) { } Model::~Model() { delete tree; } QModelIndex Model::index(int row, int column, const QModelIndex &parent) const { if (row < rc && row >= 0 && column < cc && column >= 0) { Node *parentNode = static_cast<Node*>(parent.internalPointer()); Node *childNode = node(row, parentNode); if (childNode) return createIndex(row, column, childNode); } return QModelIndex(); } QModelIndex Model::parent(const QModelIndex &child) const { if (child.isValid()) { Node *childNode = static_cast<Node*>(child.internalPointer()); Node *parentNode = parent(childNode); if (parentNode) return createIndex(row(parentNode), 0, parentNode); } return QModelIndex(); } int Model::rowCount(const QModelIndex &parent) const { return (parent.isValid() && parent.column() != 0) ? 0 : rc; } int Model::columnCount(const QModelIndex &parent) const { Q_UNUSED(parent); return cc; } QVariant Model::data(const QModelIndex &index, int role) const { if (!index.isValid()) return QVariant(); if (role == Qt::DisplayRole) return QVariant("Item " + QString::number(index.row()) + ':' + QString::number(index.column())); if (role == Qt::DecorationRole) { if (index.column() == 0) return iconProvider.icon(QFileIconProvider::Folder); return iconProvider.icon(QFileIconProvider::File); } return QVariant(); } QVariant Model::headerData(int section, Qt::Orientation orientation, int role) const { if (role == Qt::DisplayRole) return QString::number(section); if (role == Qt::DecorationRole) return QVariant::fromValue(services); return QAbstractItemModel::headerData(section, orientation, role); } bool Model::hasChildren(const QModelIndex &parent) const { if (parent.isValid() && parent.column() != 0) return false; return rc > 0 && cc > 0; } Qt::ItemFlags Model::flags(const QModelIndex &index) const { if (!index.isValid()) return 0; return Qt::ItemIsDragEnabled|QAbstractItemModel::flags(index); } Model::Node *Model::node(int row, Node *parent) const { if (parent && !parent->children) parent->children = new QVector<Node>(rc, Node(parent)); QVector<Node> *v = parent ? parent->children : tree; return const_cast<Node*>(&(v->at(row))); } Model::Node *Model::parent(Node *child) const { return child ? child->parent : 0; } int Model::row(Node *node) const { const Node *first = node->parent ? &(node->parent->children->at(0)) : &(tree->at(0)); return node - first; }