--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/doc/src/snippets/qtreeview-dnd/treemodel.cpp Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,263 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*
+ treemodel.cpp
+
+ Provides a simple tree model to show how to create and use hierarchical
+ models.
+*/
+
+#include <QtGui>
+
+#include "treeitem.h"
+#include "treemodel.h"
+
+TreeModel::TreeModel(const QStringList &strings, QObject *parent)
+ : QAbstractItemModel(parent)
+{
+ QList<QVariant> rootData;
+ rootData << "Title" << "Summary";
+ rootItem = new TreeItem(rootData);
+ setupModelData(strings, rootItem);
+}
+
+TreeModel::~TreeModel()
+{
+ delete rootItem;
+}
+
+int TreeModel::columnCount(const QModelIndex &parent) const
+{
+ if (parent.isValid())
+ return static_cast<TreeItem*>(parent.internalPointer())->columnCount();
+ else
+ return rootItem->columnCount();
+}
+
+QVariant TreeModel::data(const QModelIndex &index, int role) const
+{
+ if (!index.isValid())
+ return QVariant();
+
+ if (role != Qt::DisplayRole)
+ return QVariant();
+
+ TreeItem *item = static_cast<TreeItem*>(index.internalPointer());
+
+ return item->data(index.column());
+}
+
+Qt::ItemFlags TreeModel::flags(const QModelIndex &index) const
+{
+ if (!index.isValid())
+ return Qt::ItemIsEnabled;
+
+ return Qt::ItemIsEnabled | Qt::ItemIsSelectable;
+}
+
+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
+{
+ 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);
+ else
+ return QModelIndex();
+}
+
+bool TreeModel::insertRows(int position, int rows, const QModelIndex &parent)
+{
+ TreeItem *parentItem;
+
+ if (!parent.isValid())
+ parentItem = rootItem;
+ else
+ parentItem = static_cast<TreeItem*>(parent.internalPointer());
+
+ if (position < 0 || position > parentItem->childCount())
+ return false;
+
+ QList<QVariant> blankList;
+ for (int column = 0; column < columnCount(); ++column)
+ blankList << QVariant("");
+
+ beginInsertRows(parent, position, position + rows - 1);
+
+ for (int row = 0; row < rows; ++row) {
+ TreeItem *newItem = new TreeItem(blankList, parentItem);
+ if (!parentItem->insertChild(position, newItem))
+ break;
+ }
+
+ endInsertRows();
+ return true;
+}
+
+QModelIndex TreeModel::parent(const QModelIndex &index) const
+{
+ if (!index.isValid())
+ return QModelIndex();
+
+ TreeItem *childItem = static_cast<TreeItem*>(index.internalPointer());
+ TreeItem *parentItem = childItem->parent();
+
+ if (parentItem == rootItem)
+ return QModelIndex();
+
+ return createIndex(parentItem->row(), 0, parentItem);
+}
+
+bool TreeModel::removeRows(int position, int rows, const QModelIndex &parent)
+{
+ TreeItem *parentItem;
+
+ if (!parent.isValid())
+ parentItem = rootItem;
+ else
+ parentItem = static_cast<TreeItem*>(parent.internalPointer());
+
+ if (position < 0 || position > parentItem->childCount())
+ return false;
+
+ beginRemoveRows(parent, position, position + rows - 1);
+
+ for (int row = 0; row < rows; ++row) {
+ if (!parentItem->removeChild(position))
+ break;
+ }
+
+ endRemoveRows();
+ return true;
+}
+
+int TreeModel::rowCount(const QModelIndex &parent) const
+{
+ TreeItem *parentItem;
+
+ if (!parent.isValid())
+ parentItem = rootItem;
+ else
+ parentItem = static_cast<TreeItem*>(parent.internalPointer());
+
+ return parentItem->childCount();
+}
+
+bool TreeModel::setData(const QModelIndex &index,
+ const QVariant &value, int role)
+{
+ if (!index.isValid() || role != Qt::EditRole)
+ return false;
+
+ TreeItem *item = static_cast<TreeItem*>(index.internalPointer());
+
+ if (item->setData(index.column(), value))
+ emit dataChanged(index, index);
+ else
+ return false;
+
+ return true;
+}
+
+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()) {
+ // Read the column data from the rest of the line.
+ QStringList columnStrings = lineData.split("\t", QString::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++;
+ }
+}