|  | Home · All Classes · Main Classes · Grouped Classes · Modules · Functions |

# mainwindow.cpp Example File
tools/completer/mainwindow.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2006-2008 Trolltech ASA. All rights reserved.
     **
     ** This file is part of the documentation of the Qt Toolkit.
     **
     ** This file may be used under the terms of the GNU General Public
    ** License versions 2.0 or 3.0 as published by the Free Software
    ** Foundation and appearing in the files LICENSE.GPL2 and LICENSE.GPL3
    ** included in the packaging of this file.  Alternatively you may (at
    ** your option) use any later version of the GNU General Public
    ** License if such license has been publicly approved by Trolltech ASA
    ** (or its successors, if any) and the KDE Free Qt Foundation. In
    ** addition, as a special exception, Trolltech gives you certain
    ** additional rights. These rights are described in the Trolltech GPL
    ** Exception version 1.2, which can be found at
    ** http://www.trolltech.com/products/qt/gplexception/ and in the file
    ** GPL_EXCEPTION.txt in this package.
    **
    ** Please review the following information to ensure GNU General
    ** Public Licensing requirements will be met:
    ** http://trolltech.com/products/qt/licenses/licensing/opensource/. If
    ** you are unsure which license is appropriate for your use, please
    ** review the following information:
    ** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
    ** or contact the sales department at sales@trolltech.com.
    **
    ** In addition, as a special exception, Trolltech, as the sole
    ** copyright holder for Qt Designer, grants users of the Qt/Eclipse
    ** Integration plug-in the right for the Qt/Eclipse Integration to
    ** link to functionality provided by Qt Designer and its related
    ** libraries.
    **
    ** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
    ** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
    ** A PARTICULAR PURPOSE. Trolltech reserves all rights not expressly
    ** granted herein.
     **
     ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
     ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
     **
     ****************************************************************************/

     #include <QtGui>
     #include "dirmodel.h"
     #include "mainwindow.h"

     MainWindow::MainWindow(QWidget *parent)
         : QMainWindow(parent), completer(0), lineEdit(0)
     {
         createMenu();

         QWidget *centralWidget = new QWidget;

         QLabel *modelLabel = new QLabel;
         modelLabel->setText(tr("Model"));

         modelCombo = new QComboBox;
         modelCombo->addItem(tr("QDirModel"));
         modelCombo->addItem(tr("QDirModel that shows full path"));
         modelCombo->addItem(tr("Country list"));
         modelCombo->addItem(tr("Word list"));
         modelCombo->setCurrentIndex(0);

         QLabel *modeLabel = new QLabel;
         modeLabel->setText(tr("Completion Mode"));
         modeCombo = new QComboBox;
         modeCombo->addItem(tr("Inline"));
         modeCombo->addItem(tr("Filtered Popup"));
         modeCombo->addItem(tr("Unfiltered Popup"));
         modeCombo->setCurrentIndex(1);

         QLabel *caseLabel = new QLabel;
         caseLabel->setText(tr("Case Sensitivity"));
         caseCombo = new QComboBox;
         caseCombo->addItem(tr("Case Insensitive"));
         caseCombo->addItem(tr("Case Sensitive"));
         caseCombo->setCurrentIndex(0);

         wrapCheckBox = new QCheckBox;
         wrapCheckBox->setText(tr("Wrap around completions"));
         wrapCheckBox->setChecked(true);

         contentsLabel = new QLabel;
         contentsLabel->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);

         connect(modelCombo, SIGNAL(activated(int)), this, SLOT(changeModel()));
         connect(modeCombo, SIGNAL(activated(int)), this, SLOT(changeMode(int)));
         connect(caseCombo, SIGNAL(activated(int)), this, SLOT(changeCase(int)));

         lineEdit = new QLineEdit;

         QGridLayout *layout = new QGridLayout;
         layout->addWidget(modelLabel, 0, 0); layout->addWidget(modelCombo, 0, 1);
         layout->addWidget(modeLabel, 1, 0);  layout->addWidget(modeCombo, 1, 1);
         layout->addWidget(caseLabel, 2, 0);  layout->addWidget(caseCombo, 2, 1);
         layout->addWidget(wrapCheckBox, 3, 0);
         layout->addWidget(contentsLabel, 4, 0, 1, 2);
         layout->addWidget(lineEdit, 5, 0, 1, 2);
         centralWidget->setLayout(layout);
         setCentralWidget(centralWidget);

         changeModel();

         setWindowTitle(tr("Completer"));
         lineEdit->setFocus();
     }

     void MainWindow::createMenu()
     {
         QAction *exitAction = new QAction(tr("Exit"), this);
         QAction *aboutAct = new QAction(tr("About"), this);
         QAction *aboutQtAct = new QAction(tr("About Qt"), this);

         connect(exitAction, SIGNAL(triggered()), qApp, SLOT(quit()));
         connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));
         connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));

         QMenu* fileMenu = menuBar()->addMenu(tr("File"));
         fileMenu->addAction(exitAction);

         QMenu* helpMenu = menuBar()->addMenu(tr("About"));
         helpMenu->addAction(aboutAct);
         helpMenu->addAction(aboutQtAct);
     }

     QAbstractItemModel *MainWindow::modelFromFile(const QString& fileName)
     {
         QFile file(fileName);
         if (!file.open(QFile::ReadOnly))
             return new QStringListModel(completer);

         QApplication::setOverrideCursor(QCursor(Qt::WaitCursor));
         QStringList words;

         while (!file.atEnd()) {
             QByteArray line = file.readLine();
             if (!line.isEmpty())
                 words << line.trimmed();
         }

         QApplication::restoreOverrideCursor();

         if (!fileName.contains(QLatin1String("countries.txt")))
             return new QStringListModel(words, completer);

         // The last two chars of the countries.txt file indicate the country
         // symbol. We put that in column 2 of a standard item model
         QStandardItemModel *m = new QStandardItemModel(words.count(), 2, completer);
         for (int i = 0; i < words.count(); ++i) {
             QModelIndex countryIdx = m->index(i, 0);
             QModelIndex symbolIdx = m->index(i, 1);
             QString country = words[i].mid(0, words[i].length() - 2).trimmed();
             QString symbol = words[i].right(2);
             m->setData(countryIdx, country);
             m->setData(symbolIdx, symbol);
         }

         return m;
     }

     void MainWindow::changeMode(int index)
     {
         QCompleter::CompletionMode mode;
         if (index == 0)
             mode = QCompleter::InlineCompletion;
         else if (index == 1)
             mode = QCompleter::PopupCompletion;
         else
             mode = QCompleter::UnfilteredPopupCompletion;

         completer->setCompletionMode(mode);
     }

     void MainWindow::changeCase(int cs)
     {
         completer->setCaseSensitivity(cs ? Qt::CaseSensitive : Qt::CaseInsensitive);
     }

     void MainWindow::changeModel()
     {
         delete completer;
         completer = new QCompleter(this);

         switch (modelCombo->currentIndex()) {
         default:
         case 0:
             { // Unsorted QDirModel
                 QDirModel *dirModel = new QDirModel(completer);
                 completer->setModel(dirModel);
                 contentsLabel->setText(tr("Enter file path"));
             }
             break;
         case 1:
             { // DirModel that shows full paths
                 DirModel *dirModel = new DirModel(completer);
                 completer->setModel(dirModel);
                 contentsLabel->setText(tr("Enter file path"));
             }
             break;
         case 2:
             { // Country List
                 completer->setModel(modelFromFile(":/resources/countries.txt"));
                 QTreeView *treeView = new QTreeView;
                 completer->setPopup(treeView);
                 treeView->setRootIsDecorated(false);
                 treeView->header()->hide();
                 treeView->header()->setStretchLastSection(false);
                 treeView->header()->setResizeMode(0, QHeaderView::Stretch);
                 treeView->header()->setResizeMode(1, QHeaderView::ResizeToContents);
                 contentsLabel->setText(tr("Enter name of your country"));
             }
             break;
         case 3:
             { // Word list
                 completer->setModel(modelFromFile(":/resources/wordlist.txt"));
                 completer->setModelSorting(QCompleter::CaseInsensitivelySortedModel);
                 contentsLabel->setText(tr("Enter a word"));
             }
             break;
         }

         changeMode(modeCombo->currentIndex());
         changeCase(caseCombo->currentIndex());
         completer->setWrapAround(wrapCheckBox->isChecked());
         lineEdit->setCompleter(completer);
         connect(wrapCheckBox, SIGNAL(clicked(bool)), completer, SLOT(setWrapAround(bool)));
     }

     void MainWindow::about()
     {
         QMessageBox::about(this, tr("About"), tr("This example demonstrates the "
             "different features of the QCompleter class."));
     }