<?xml version="1.0" encoding="iso-8859-1"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <title>Qt 4.2: treemodel.cpp Example File (itemviews/simpletreemodel/treemodel.cpp)</title> <link href="classic.css" rel="stylesheet" type="text/css" /> </head> <body> <table border="0" cellpadding="0" cellspacing="0" width="100%"> <tr> <td align="left" valign="top" width="32"><a href="http://www.trolltech.com/products/qt"><img src="images/qt-logo.png" align="left" width="32" height="32" border="0" /></a></td> <td width="1"> </td><td class="postheader" valign="center"><a href="index.html"><font color="#004faf">Home</font></a> · <a href="classes.html"><font color="#004faf">All Classes</font></a> · <a href="mainclasses.html"><font color="#004faf">Main Classes</font></a> · <a href="groups.html"><font color="#004faf">Grouped Classes</font></a> · <a href="modules.html"><font color="#004faf">Modules</font></a> · <a href="functions.html"><font color="#004faf">Functions</font></a></td> <td align="right" valign="top" width="230"><a href="http://www.trolltech.com"><img src="images/trolltech-logo.png" align="right" width="203" height="32" border="0" /></a></td></tr></table><h1 align="center">treemodel.cpp Example File<br /><sup><sup>itemviews/simpletreemodel/treemodel.cpp</sup></sup></h1> <pre> /**************************************************************************** ** ** Copyright (C) 2005-2006 Trolltech ASA. All rights reserved. ** ** This file is part of the example classes of the Qt Toolkit. ** ** This file may be used under the terms of the GNU General Public ** License version 2.0 as published by the Free Software Foundation ** and appearing in the file LICENSE.GPL included in the packaging of ** this file. Please review the following information to ensure GNU ** General Public Licensing requirements will be met: ** http:<span class="comment">//www.trolltech.com/products/qt/opensource.html</span> ** ** If you are unsure which license is appropriate for your use, please ** review the following information: ** http:<span class="comment">//www.trolltech.com/products/qt/licensing.html or contact the</span> ** sales department at sales@trolltech.com. ** ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. ** ****************************************************************************/ /* 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 QString &data, QObject *parent) : QAbstractItemModel(parent) { QList<QVariant> rootData; rootData << "Title" << "Summary"; rootItem = new TreeItem(rootData); setupModelData(data.split(QString("\n")), 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(); } 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); } int TreeModel::rowCount(const QModelIndex &parent) const { TreeItem *parentItem; if (!parent.isValid()) parentItem = rootItem; else parentItem = static_cast<TreeItem*>(parent.internalPointer()); return parentItem->childCount(); } 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); QList<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> parents.last()->appendChild(new TreeItem(columnData, parents.last())); } number++; } }</pre> <p /><address><hr /><div align="center"> <table width="100%" cellspacing="0" border="0"><tr class="address"> <td width="30%">Copyright © 2006 <a href="trolltech.html">Trolltech</a></td> <td width="40%" align="center"><a href="trademarks.html">Trademarks</a></td> <td width="30%" align="right"><div align="right">Qt 4.2.1</div></td> </tr></table></div></address></body> </html>