38be0d1383
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110 lines
4.5 KiB
C++
Executable File
110 lines
4.5 KiB
C++
Executable File
/****************************************************************************
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**
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** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
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** the names of its contributors may be used to endorse or promote
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** products derived from this software without specific prior written
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** permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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//! [quoting modelview_a]
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#include <QTreeView>
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#include <QStandardItemModel>
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#include <QItemSelectionModel>
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#include "mainwindow.h"
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MainWindow::MainWindow(QWidget *parent)
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: QMainWindow(parent)
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{
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treeView = new QTreeView(this);
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setCentralWidget(treeView);
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standardModel = new QStandardItemModel ;
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QStandardItem *rootNode = standardModel->invisibleRootItem();
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//defining a couple of items
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QStandardItem *americaItem = new QStandardItem("America");
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QStandardItem *mexicoItem = new QStandardItem("Canada");
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QStandardItem *usaItem = new QStandardItem("USA");
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QStandardItem *bostonItem = new QStandardItem("Boston");
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QStandardItem *europeItem = new QStandardItem("Europe");
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QStandardItem *italyItem = new QStandardItem("Italy");
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QStandardItem *romeItem = new QStandardItem("Rome");
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QStandardItem *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, SIGNAL(selectionChanged (const QItemSelection &, const QItemSelection &)),
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this, SLOT(selectionChangedSlot(const QItemSelection &, const QItemSelection &)));
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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() != QModelIndex())
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{
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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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