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73 lines
2.4 KiB
C++
73 lines
2.4 KiB
C++
// Copyright (C) 2016 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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//! [quoting modelview_a]
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#include "mainwindow.h"
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#include <QTreeView>
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#include <QStandardItemModel>
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#include <QItemSelectionModel>
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MainWindow::MainWindow(QWidget *parent)
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: QMainWindow(parent)
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, treeView(new QTreeView(this))
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, standardModel(new QStandardItemModel(this))
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{
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setCentralWidget(treeView);
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auto *rootNode = standardModel->invisibleRootItem();
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// defining a couple of items
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auto *americaItem = new QStandardItem("America");
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auto *mexicoItem = new QStandardItem("Canada");
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auto *usaItem = new QStandardItem("USA");
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auto *bostonItem = new QStandardItem("Boston");
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auto *europeItem = new QStandardItem("Europe");
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auto *italyItem = new QStandardItem("Italy");
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auto *romeItem = new QStandardItem("Rome");
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auto *veronaItem = new QStandardItem("Verona");
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// building up the hierarchy
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rootNode-> appendRow(americaItem);
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rootNode-> appendRow(europeItem);
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americaItem-> appendRow(mexicoItem);
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americaItem-> appendRow(usaItem);
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usaItem-> appendRow(bostonItem);
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europeItem-> appendRow(italyItem);
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italyItem-> appendRow(romeItem);
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italyItem-> appendRow(veronaItem);
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// register the model
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treeView->setModel(standardModel);
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treeView->expandAll();
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// selection changes shall trigger a slot
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QItemSelectionModel *selectionModel = treeView->selectionModel();
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connect(selectionModel, &QItemSelectionModel::selectionChanged,
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this, &MainWindow::selectionChangedSlot);
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}
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//! [quoting modelview_a]
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//------------------------------------------------------------------------------------
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//! [quoting modelview_b]
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void MainWindow::selectionChangedSlot(const QItemSelection & /*newSelection*/, const QItemSelection & /*oldSelection*/)
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{
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// get the text of the selected item
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const QModelIndex index = treeView->selectionModel()->currentIndex();
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QString selectedText = index.data(Qt::DisplayRole).toString();
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// find out the hierarchy level of the selected item
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int hierarchyLevel = 1;
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QModelIndex seekRoot = index;
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while (seekRoot.parent().isValid()) {
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seekRoot = seekRoot.parent();
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hierarchyLevel++;
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}
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QString showString = QString("%1, Level %2").arg(selectedText)
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.arg(hierarchyLevel);
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setWindowTitle(showString);
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}
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//! [quoting modelview_b]
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