treemodel.cpp Example File

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#include <QtWidgets> #include "treeitem.h" #include "treemodel.h" TreeModel::TreeModel(const QStringList &headers, const QString &data, QObject *parent) : QAbstractItemModel(parent) { QVector<QVariant> rootData; foreach (QString header, headers) rootData << header; rootItem = new TreeItem(rootData); setupModelData(data.split(QString("\n")), rootItem); } TreeModel::~TreeModel() { delete rootItem; } int TreeModel::columnCount(const QModelIndex & /* parent */) const { return rootItem->columnCount(); } QVariant TreeModel::data(const QModelIndex &index, int role) const { if (!index.isValid()) return QVariant(); if (role != Qt::DisplayRole && role != Qt::EditRole) return QVariant(); TreeItem *item = getItem(index); return item->data(index.column()); } Qt::ItemFlags TreeModel::flags(const QModelIndex &index) const { if (!index.isValid()) return 0; return Qt::ItemIsEditable | QAbstractItemModel::flags(index); } TreeItem *TreeModel::getItem(const QModelIndex &index) const { if (index.isValid()) { TreeItem *item = static_cast<TreeItem*>(index.internalPointer()); if (item) return item; } return rootItem; } QVariant TreeModel::headerData(int section, Qt::Orientation orientation, int role) const { if (orientation == Qt::Horizontal && role == Qt::DisplayRole) return rootItem->data(section); return QVariant(); } QModelIndex TreeModel::index(int row, int column, const QModelIndex &parent) const { if (parent.isValid() && parent.column() != 0) return QModelIndex(); TreeItem *parentItem = getItem(parent); TreeItem *childItem = parentItem->child(row); if (childItem) return createIndex(row, column, childItem); else return QModelIndex(); } bool TreeModel::insertColumns(int position, int columns, const QModelIndex &parent) { bool success; beginInsertColumns(parent, position, position + columns - 1); success = rootItem->insertColumns(position, columns); endInsertColumns(); return success; } bool TreeModel::insertRows(int position, int rows, const QModelIndex &parent) { TreeItem *parentItem = getItem(parent); bool success; beginInsertRows(parent, position, position + rows - 1); success = parentItem->insertChildren(position, rows, rootItem->columnCount()); endInsertRows(); return success; } QModelIndex TreeModel::parent(const QModelIndex &index) const { if (!index.isValid()) return QModelIndex(); TreeItem *childItem = getItem(index); TreeItem *parentItem = childItem->parent(); if (parentItem == rootItem) return QModelIndex(); return createIndex(parentItem->childNumber(), 0, parentItem); } bool TreeModel::removeColumns(int position, int columns, const QModelIndex &parent) { bool success; beginRemoveColumns(parent, position, position + columns - 1); success = rootItem->removeColumns(position, columns); endRemoveColumns(); if (rootItem->columnCount() == 0) removeRows(0, rowCount()); return success; } bool TreeModel::removeRows(int position, int rows, const QModelIndex &parent) { TreeItem *parentItem = getItem(parent); bool success = true; beginRemoveRows(parent, position, position + rows - 1); success = parentItem->removeChildren(position, rows); endRemoveRows(); return success; } int TreeModel::rowCount(const QModelIndex &parent) const { TreeItem *parentItem = getItem(parent); return parentItem->childCount(); } bool TreeModel::setData(const QModelIndex &index, const QVariant &value, int role) { if (role != Qt::EditRole) return false; TreeItem *item = getItem(index); bool result = item->setData(index.column(), value); if (result) emit dataChanged(index, index); return result; } bool TreeModel::setHeaderData(int section, Qt::Orientation orientation, const QVariant &value, int role) { if (role != Qt::EditRole || orientation != Qt::Horizontal) return false; bool result = rootItem->setData(section, value); if (result) emit headerDataChanged(orientation, section, section); return result; } void TreeModel::setupModelData(const QStringList &lines, TreeItem *parent) { 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].at(position) != ' ') 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", QString::SkipEmptyParts); QVector<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. TreeItem *parent = parents.last(); parent->insertChildren(parent->childCount(), 1, rootItem->columnCount()); for (int column = 0; column < columnData.size(); ++column) parent->child(parent->childCount() - 1)->setData(column, columnData[column]); } ++number; } }

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