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//! [quoting modelview_a]
#include <QTreeView>
#include <QStandardItemModel>
#include <QItemSelectionModel>
#include "modelview.h"
ModelView::ModelView(QWidget *parent)
: QMainWindow(parent)
{
treeView = new QTreeView(this);
setCentralWidget(treeView);
standardModel = new QStandardItemModel ;
QStandardItem *rootNode = standardModel->invisibleRootItem();
//defining a couple of items
QStandardItem *americaItem = new QStandardItem("America");
QStandardItem *mexicoItem = new QStandardItem("Canada");
QStandardItem *usaItem = new QStandardItem("USA");
QStandardItem *bostonItem = new QStandardItem("Boston");
QStandardItem *europeItem = new QStandardItem("Europe");
QStandardItem *italyItem = new QStandardItem("Italy");
QStandardItem *romeItem = new QStandardItem("Rome");
QStandardItem *veronaItem = new QStandardItem("Verona");
//building up the hierarchy
rootNode-> appendRow(americaItem);
rootNode-> appendRow(europeItem);
americaItem-> appendRow(mexicoItem);
americaItem-> appendRow(usaItem);
usaItem-> appendRow(bostonItem);
europeItem-> appendRow(italyItem);
italyItem-> appendRow(romeItem);
italyItem-> appendRow(veronaItem);
//register the model
treeView->setModel( standardModel );
treeView->expandAll();
//selection changes shall trigger a slot
QItemSelectionModel *selectionModel= treeView->selectionModel();
connect(selectionModel, SIGNAL(selectionChanged ( const QItemSelection & , const QItemSelection & )),
this, SLOT(selectionChangedSlot(const QItemSelection & , const QItemSelection & )));
}
//! [quoting modelview_a]
//------------------------------------------------------------------------------------
//! [quoting modelview_b]
void ModelView::selectionChangedSlot(const QItemSelection & /*newSelection*/, const QItemSelection & /*oldSelection*/)
{
const QModelIndex index = treeView->selectionModel()->currentIndex();
QString selectedText = index.data(Qt::DisplayRole).toString();
int hierarchyLevel=1;
QModelIndex seekRoot = index;
while(seekRoot.parent() != QModelIndex() )
{
seekRoot = seekRoot.parent();
hierarchyLevel++;
}
QString showString = QString("%1, Level %2").arg(selectedText)
.arg(hierarchyLevel);
setWindowTitle(showString);
}
//! [quoting modelview_b]
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