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     2 **

     3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

     4 ** All rights reserved.

     5 ** Contact: Nokia Corporation (qt-info@nokia.com)

     6 **

     7 ** This file is part of the demonstration applications of the Qt Toolkit.

     8 **

     9 ** $QT_BEGIN_LICENSE:LGPL$

    10 ** No Commercial Usage

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    12 ** You may use this file in accordance with the terms and conditions

    13 ** contained in the Technology Preview License Agreement accompanying

    14 ** this package.

    15 **

    16 ** GNU Lesser General Public License Usage

    17 ** Alternatively, this file may be used under the terms of the GNU Lesser

    18 ** General Public License version 2.1 as published by the Free Software

    19 ** Foundation and appearing in the file LICENSE.LGPL included in the

    20 ** packaging of this file.  Please review the following information to

    21 ** ensure the GNU Lesser General Public License version 2.1 requirements

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    23 **

    24 ** In addition, as a special exception, Nokia gives you certain additional

    25 ** rights.  These rights are described in the Nokia Qt LGPL Exception

    26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

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    38 ** $QT_END_LICENSE$

    39 **

    40 ****************************************************************************/

    41 

    42 #include "model.h"

    43 #include <QIcon>

    44 #include <QPixmap>

    45 

    46 Model::Model(int rows, int columns, QObject *parent)

    47     : QAbstractItemModel(parent),

    48       rc(rows), cc(columns),

    49       tree(new QVector<Node>(rows, Node(0)))

    50 {

    51 

    52 }

    53 

    54 Model::~Model()

    55 {

    56     delete tree;

    57 }

    58 

    59 QModelIndex Model::index(int row, int column, const QModelIndex &parent) const

    60 {

    61     if (row < rc && row >= 0 && column < cc && column >= 0) {

    62         Node *p = static_cast<Node*>(parent.internalPointer());

    63         Node *n = node(row, p);

    64 	if (n)

    65 	    return createIndex(row, column, n);

    66     }

    67     return QModelIndex();

    68 }

    69 

    70 QModelIndex Model::parent(const QModelIndex &child) const

    71 {

    72     if (child.isValid()) {

    73         Node *n = static_cast<Node*>(child.internalPointer());

    74         Node *p = parent(n);

    75         if (p)

    76             return createIndex(row(p), 0, p);

    77     }

    78     return QModelIndex();

    79 }

    80 

    81 int Model::rowCount(const QModelIndex &parent) const

    82 {

    83     return (parent.isValid() && parent.column() != 0) ? 0 : rc;

    84 }

    85 

    86 int Model::columnCount(const QModelIndex &parent) const

    87 {

    88     Q_UNUSED(parent);

    89     return cc;

    90 }

    91 

    92 QVariant Model::data(const QModelIndex &index, int role) const

    93 {

    94     if (!index.isValid())

    95         return QVariant();

    96     if (role == Qt::DisplayRole)

    97 	return "Item " + QString::number(index.row()) + ":" + QString::number(index.column());

    98     if (role == Qt::DecorationRole) {

    99         if (index.column() == 0)

   100             return iconProvider.icon(QFileIconProvider::Folder);

   101         return iconProvider.icon(QFileIconProvider::File);

   102     }

   103     return QVariant();

   104 }

   105 

   106 QVariant Model::headerData(int section, Qt::Orientation orientation, int role) const

   107 {

   108     static QIcon services(QPixmap(":/images/services.png"));

   109     if (role == Qt::DisplayRole)

   110         return QString::number(section);

   111     if (role == Qt::DecorationRole)

   112         return qVariantFromValue(services);

   113     return QAbstractItemModel::headerData(section, orientation, role);

   114 }

   115 

   116 bool Model::hasChildren(const QModelIndex &parent) const

   117 {

   118     if (parent.isValid() && parent.column() != 0)

   119         return false;

   120     return rc > 0 && cc > 0;

   121 }

   122 

   123 Qt::ItemFlags Model::flags(const QModelIndex &index) const

   124 {

   125     if (!index.isValid())

   126         return 0;

   127     return (Qt::ItemIsDragEnabled|Qt::ItemIsSelectable|Qt::ItemIsEnabled);

   128 }

   129 

   130 Model::Node *Model::node(int row, Node *parent) const

   131 {

   132     if (parent && !parent->children)

   133 	parent->children = new QVector<Node>(rc, Node(parent));

   134     QVector<Node> *v = parent ? parent->children : tree;

   135     return const_cast<Node*>(&(v->at(row)));

   136 }

   137 

   138 Model::Node *Model::parent(Node *child) const

   139 {

   140     return child ? child->parent : 0;

   141 }

   142 

   143 int Model::row(Node *node) const

   144 {

   145      const Node *first = node->parent ? &(node->parent->children->at(0)) : &(tree->at(0));

   146      return (node - first);

   147 }