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<title>Qt 4.6: treemodel.cpp Example File (itemviews/editabletreemodel/treemodel.cpp)</title>
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<pre><span class="comment"> /****************************************************************************
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#include <QtGui>
#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 & <span class="comment">/* parent */</span>) 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 | Qt::ItemIsEnabled | Qt::ItemIsSelectable;
}
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].mid(position, 1) != " ")
break;
position++;
}
QString lineData = lines[number].mid(position).trimmed();
if (!lineData.isEmpty()) {
<span class="comment">// Read the column data from the rest of the line.</span>
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()) {
<span class="comment">// The last child of the current parent is now the new parent</span>
<span class="comment">// unless the current parent has no children.</span>
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();
}
}
<span class="comment">// Append a new item to the current parent's list of children.</span>
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++;
}
}</pre>
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