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50
51#include "model.h"
52
53#include <QPixmap>
54
55Model::Model(int rows, int columns, QObject *parent)
56 : QAbstractItemModel(parent),
57 services(QPixmap(":/images/services.png")),
58 rc(rows), cc(columns),
59 tree(new QVector<Node>(rows, Node()))
60{
61
62}
63
64Model::~Model()
65{
66 delete tree;
67}
68
69QModelIndex Model::index(int row, int column, const QModelIndex &parent) const
70{
71 if (row < rc && row >= 0 && column < cc && column >= 0) {
72 Node *parentNode = static_cast<Node*>(parent.internalPointer());
73 Node *childNode = node(row, parent: parentNode);
74 if (childNode)
75 return createIndex(arow: row, acolumn: column, adata: childNode);
76 }
77 return QModelIndex();
78}
79
80QModelIndex Model::parent(const QModelIndex &child) const
81{
82 if (child.isValid()) {
83 Node *childNode = static_cast<Node*>(child.internalPointer());
84 Node *parentNode = parent(child: childNode);
85 if (parentNode)
86 return createIndex(arow: row(node: parentNode), acolumn: 0, adata: parentNode);
87 }
88 return QModelIndex();
89}
90
91int Model::rowCount(const QModelIndex &parent) const
92{
93 return (parent.isValid() && parent.column() != 0) ? 0 : rc;
94}
95
96int Model::columnCount(const QModelIndex &parent) const
97{
98 Q_UNUSED(parent);
99 return cc;
100}
101
102QVariant Model::data(const QModelIndex &index, int role) const
103{
104 if (!index.isValid())
105 return QVariant();
106 if (role == Qt::DisplayRole)
107 return QVariant("Item " + QString::number(index.row()) + ':' + QString::number(index.column()));
108 if (role == Qt::DecorationRole) {
109 if (index.column() == 0)
110 return iconProvider.icon(type: QFileIconProvider::Folder);
111 return iconProvider.icon(type: QFileIconProvider::File);
112 }
113 return QVariant();
114}
115
116QVariant Model::headerData(int section, Qt::Orientation orientation, int role) const
117{
118 if (role == Qt::DisplayRole)
119 return QString::number(section);
120 if (role == Qt::DecorationRole)
121 return QVariant::fromValue(value: services);
122 return QAbstractItemModel::headerData(section, orientation, role);
123}
124
125bool Model::hasChildren(const QModelIndex &parent) const
126{
127 if (parent.isValid() && parent.column() != 0)
128 return false;
129 return rc > 0 && cc > 0;
130}
131
132Qt::ItemFlags Model::flags(const QModelIndex &index) const
133{
134 if (!index.isValid())
135 return {};
136 return Qt::ItemIsDragEnabled|QAbstractItemModel::flags(index);
137}
138
139Model::Node *Model::node(int row, Node *parent) const
140{
141 if (parent && !parent->children)
142 parent->children = new QVector<Node>(rc, Node(parent));
143 QVector<Node> *v = parent ? parent->children : tree;
144 return const_cast<Node*>(&(v->at(i: row)));
145}
146
147Model::Node *Model::parent(Node *child) const
148{
149 return child ? child->parent : nullptr;
150}
151
152int Model::row(Node *node) const
153{
154 const Node *first = node->parent ? &(node->parent->children->at(i: 0)) : &(tree->at(i: 0));
155 return node - first;
156}
157

source code of qtbase/examples/widgets/itemviews/interview/model.cpp