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

     /****************************************************************************
     **
     ** Copyright (C) 2006-2006 Trolltech ASA. All rights reserved.
     **
     ** This file is part of the example classes of the Qt Toolkit.
     **
     ** This file may be used under the terms of the GNU General Public
     ** License version 2.0 as published by the Free Software Foundation
     ** and appearing in the file LICENSE.GPL included in the packaging of
     ** this file.  Please review the following information to ensure GNU
     ** General Public Licensing requirements will be met:
     ** http://www.trolltech.com/products/qt/opensource.html
     **
     ** If you are unsure which license is appropriate for your use, please
     ** review the following information:
     ** http://www.trolltech.com/products/qt/licensing.html or contact the
     ** sales department at sales@trolltech.com.
     **
     ** 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), comboBox(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"));
     #ifdef Q_OS_WIN
         caseCombo->setCurrentIndex(0);
     #else
         caseCombo->setCurrentIndex(1);
     #endif

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

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

         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(contentsLabel, 3, 0, 1, 2);
         centralWidget->setLayout(layout);
         setCentralWidget(centralWidget);

         useComboBox(false);
         updateModel();
         changeCase(caseCombo->currentIndex());
         changeMode(modeCombo->currentIndex());

         setWindowTitle(tr("Completer"));
     }

     void MainWindow::createMenu()
     {
         QAction *comboAction = new QAction(tr("Show QComboBox"), this);
         comboAction->setCheckable(true);
         QAction *exitAction = new QAction(tr("Exit"), this);
         QAction *aboutAct = new QAction(tr("About"), this);
         QAction *aboutQtAct = new QAction(tr("About Qt"), this);

         connect(comboAction, SIGNAL(toggled(bool)), this, SLOT(useComboBox(bool)));
         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(comboAction);
         fileMenu->addSeparator();
         fileMenu->addAction(exitAction);

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

     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);
     }

     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::updateModel()
     {
         if (completer) {
             comboBox ? comboBox->setCompleter(0) : lineEdit->setCompleter(0);
             delete completer;
         }
         completer = new QCompleter(this);
         comboBox ? comboBox->setCompleter(completer) : lineEdit->setCompleter(completer);

         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;
         }

         changeCase(caseCombo->currentIndex());
         changeMode(modeCombo->currentIndex());
     }

     void MainWindow::useComboBox(bool combo)
     {
         if ((comboBox && combo) || (lineEdit && !combo))
             return;
         if (combo) {
             delete lineEdit;
             lineEdit = 0;
             comboBox = new QComboBox;
             comboBox->setEditable(true);
             comboBox->setCompleter(completer);
             (static_cast<QGridLayout *>(centralWidget()->layout()))->addWidget(comboBox, 4, 0, 1, 2);
             comboBox->setFocus();
         } else {
             delete comboBox;
             comboBox = 0;
             lineEdit = new QLineEdit;
             lineEdit->setCompleter(completer);
             (static_cast<QGridLayout *>(centralWidget()->layout()))->addWidget(lineEdit, 4, 0, 1, 2);
             lineEdit->setFocus();
         }
     }

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

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