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50
51//! [quoting modelview_a]
52#include "mainwindow.h"
53
54#include <QTreeView>
55#include <QStandardItemModel>
56#include <QItemSelectionModel>
57
58MainWindow::MainWindow(QWidget *parent)
59 : QMainWindow(parent)
60 , treeView(new QTreeView(this))
61 , standardModel(new QStandardItemModel(this))
62{
63 setCentralWidget(treeView);
64 QStandardItem *rootNode = standardModel->invisibleRootItem();
65
66
67 //defining a couple of items
68 QStandardItem *americaItem = new QStandardItem("America");
69 QStandardItem *mexicoItem = new QStandardItem("Canada");
70 QStandardItem *usaItem = new QStandardItem("USA");
71 QStandardItem *bostonItem = new QStandardItem("Boston");
72 QStandardItem *europeItem = new QStandardItem("Europe");
73 QStandardItem *italyItem = new QStandardItem("Italy");
74 QStandardItem *romeItem = new QStandardItem("Rome");
75 QStandardItem *veronaItem = new QStandardItem("Verona");
76
77 //building up the hierarchy
78 rootNode-> appendRow(aitem: americaItem);
79 rootNode-> appendRow(aitem: europeItem);
80 americaItem-> appendRow(aitem: mexicoItem);
81 americaItem-> appendRow(aitem: usaItem);
82 usaItem-> appendRow(aitem: bostonItem);
83 europeItem-> appendRow(aitem: italyItem);
84 italyItem-> appendRow(aitem: romeItem);
85 italyItem-> appendRow(aitem: veronaItem);
86
87 //register the model
88 treeView->setModel(standardModel);
89 treeView->expandAll();
90
91 //selection changes shall trigger a slot
92 QItemSelectionModel *selectionModel = treeView->selectionModel();
93 connect(sender: selectionModel, signal: &QItemSelectionModel::selectionChanged,
94 receiver: this, slot: &MainWindow::selectionChangedSlot);
95}
96//! [quoting modelview_a]
97
98//------------------------------------------------------------------------------------
99
100//! [quoting modelview_b]
101void MainWindow::selectionChangedSlot(const QItemSelection & /*newSelection*/, const QItemSelection & /*oldSelection*/)
102{
103 //get the text of the selected item
104 const QModelIndex index = treeView->selectionModel()->currentIndex();
105 QString selectedText = index.data(arole: Qt::DisplayRole).toString();
106 //find out the hierarchy level of the selected item
107 int hierarchyLevel = 1;
108 QModelIndex seekRoot = index;
109 while (seekRoot.parent() != QModelIndex()) {
110 seekRoot = seekRoot.parent();
111 hierarchyLevel++;
112 }
113 QString showString = QString("%1, Level %2").arg(a: selectedText)
114 .arg(a: hierarchyLevel);
115 setWindowTitle(showString);
116}
117//! [quoting modelview_b]
118
119
120

source code of qtbase/examples/widgets/tutorials/modelview/7_selections/mainwindow.cpp