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    41 

    42 #include <QtGui>

    43 #include "treemodelcompleter.h"

    44 #include "mainwindow.h"

    45 

    46 //! [0]

    47 MainWindow::MainWindow(QWidget *parent)

    48     : QMainWindow(parent), completer(0), lineEdit(0)

    49 {

    50     createMenu();

    51 

    52     completer = new TreeModelCompleter(this);

    53     completer->setModel(modelFromFile(":/resources/treemodel.txt"));

    54     completer->setSeparator(QLatin1String("."));

    55     QObject::connect(completer, SIGNAL(highlighted(const QModelIndex&)),

    56                      this, SLOT(highlight(const QModelIndex&)));

    57 

    58     QWidget *centralWidget = new QWidget;

    59 

    60     QLabel *modelLabel = new QLabel;

    61     modelLabel->setText(tr("Tree Model<br>(Double click items to edit)"));

    62 

    63     QLabel *modeLabel = new QLabel;

    64     modeLabel->setText(tr("Completion Mode"));

    65     modeCombo = new QComboBox;

    66     modeCombo->addItem(tr("Inline"));

    67     modeCombo->addItem(tr("Filtered Popup"));

    68     modeCombo->addItem(tr("Unfiltered Popup"));

    69     modeCombo->setCurrentIndex(1);

    70 

    71     QLabel *caseLabel = new QLabel;

    72     caseLabel->setText(tr("Case Sensitivity"));

    73     caseCombo = new QComboBox;

    74     caseCombo->addItem(tr("Case Insensitive"));

    75     caseCombo->addItem(tr("Case Sensitive"));

    76     caseCombo->setCurrentIndex(0);

    77 //! [0]

    78 

    79 //! [1]

    80     QLabel *separatorLabel = new QLabel;

    81     separatorLabel->setText(tr("Tree Separator"));

    82 

    83     QLineEdit *separatorLineEdit = new QLineEdit;

    84     separatorLineEdit->setText(completer->separator());

    85     connect(separatorLineEdit, SIGNAL(textChanged(const QString&)),

    86             completer, SLOT(setSeparator(const QString&)));

    87 

    88     QCheckBox *wrapCheckBox = new QCheckBox;

    89     wrapCheckBox->setText(tr("Wrap around completions"));

    90     wrapCheckBox->setChecked(completer->wrapAround());

    91     connect(wrapCheckBox, SIGNAL(clicked(bool)), completer, SLOT(setWrapAround(bool)));

    92 

    93     contentsLabel = new QLabel;

    94     contentsLabel->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);

    95     connect(separatorLineEdit, SIGNAL(textChanged(const QString&)),

    96             this, SLOT(updateContentsLabel(const QString&)));

    97 

    98     treeView = new QTreeView;

    99     treeView->setModel(completer->model());

   100     treeView->header()->hide();

   101     treeView->expandAll();

   102 //! [1]

   103 

   104 //! [2]

   105     connect(modeCombo, SIGNAL(activated(int)), this, SLOT(changeMode(int)));

   106     connect(caseCombo, SIGNAL(activated(int)), this, SLOT(changeCase(int)));

   107 

   108     lineEdit = new QLineEdit;

   109     lineEdit->setCompleter(completer);

   110 //! [2]

   111 

   112 //! [3]

   113     QGridLayout *layout = new QGridLayout;

   114     layout->addWidget(modelLabel, 0, 0); layout->addWidget(treeView, 0, 1);

   115     layout->addWidget(modeLabel, 1, 0);  layout->addWidget(modeCombo, 1, 1);

   116     layout->addWidget(caseLabel, 2, 0);  layout->addWidget(caseCombo, 2, 1);

   117     layout->addWidget(separatorLabel, 3, 0); layout->addWidget(separatorLineEdit, 3, 1);

   118     layout->addWidget(wrapCheckBox, 4, 0);

   119     layout->addWidget(contentsLabel, 5, 0, 1, 2);

   120     layout->addWidget(lineEdit, 6, 0, 1, 2);

   121     centralWidget->setLayout(layout);

   122     setCentralWidget(centralWidget);

   123 

   124     changeCase(caseCombo->currentIndex());

   125     changeMode(modeCombo->currentIndex());

   126 

   127     setWindowTitle(tr("Tree Model Completer"));

   128     lineEdit->setFocus();

   129 }

   130 //! [3]

   131 

   132 //! [4]

   133 void MainWindow::createMenu()

   134 {

   135     QAction *exitAction = new QAction(tr("Exit"), this);

   136     QAction *aboutAct = new QAction(tr("About"), this);

   137     QAction *aboutQtAct = new QAction(tr("About Qt"), this);

   138 

   139     connect(exitAction, SIGNAL(triggered()), qApp, SLOT(quit()));

   140     connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));

   141     connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));

   142 

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

   144     fileMenu->addAction(exitAction);

   145 

   146     QMenu* helpMenu = menuBar()->addMenu(tr("About"));

   147     helpMenu->addAction(aboutAct);

   148     helpMenu->addAction(aboutQtAct);

   149 }

   150 //! [4]

   151 

   152 //! [5]

   153 void MainWindow::changeMode(int index)

   154 {

   155     QCompleter::CompletionMode mode;

   156     if (index == 0)

   157         mode = QCompleter::InlineCompletion;

   158     else if (index == 1)

   159         mode = QCompleter::PopupCompletion;

   160     else

   161         mode = QCompleter::UnfilteredPopupCompletion;

   162 

   163     completer->setCompletionMode(mode);

   164 }

   165 //! [5]

   166 

   167 QAbstractItemModel *MainWindow::modelFromFile(const QString& fileName)

   168 {

   169     QFile file(fileName);

   170     if (!file.open(QFile::ReadOnly))

   171         return new QStringListModel(completer);

   172 

   173 #ifndef QT_NO_CURSOR

   174     QApplication::setOverrideCursor(QCursor(Qt::WaitCursor));

   175 #endif

   176     QStringList words;

   177 

   178     QStandardItemModel *model = new QStandardItemModel(completer);

   179     QVector<QStandardItem *> parents(10);

   180     parents[0] = model->invisibleRootItem();

   181 

   182     while (!file.atEnd()) {

   183         QString line = file.readLine();

   184         QString trimmedLine = line.trimmed();

   185         if (line.isEmpty() || trimmedLine.isEmpty())

   186             continue;

   187 

   188         QRegExp re("^\\s+");

   189         int nonws = re.indexIn(line);

   190         int level = 0;

   191         if (nonws == -1) {

   192             level = 0;

   193         } else {

   194             if (line.startsWith("\t")) {

   195                 level = re.cap(0).length();

   196             } else {

   197                 level = re.cap(0).length()/4;

   198             }

   199         }

   200 

   201         if (level+1 >= parents.size())

   202             parents.resize(parents.size()*2);

   203 

   204         QStandardItem *item = new QStandardItem;

   205         item->setText(trimmedLine);

   206         parents[level]->appendRow(item);

   207         parents[level+1] = item;

   208     }

   209 

   210 #ifndef QT_NO_CURSOR

   211     QApplication::restoreOverrideCursor();

   212 #endif

   213 

   214     return model;

   215 }

   216 

   217 void MainWindow::highlight(const QModelIndex &index)

   218 {

   219     QAbstractItemModel *completionModel = completer->completionModel();

   220     QAbstractProxyModel *proxy = qobject_cast<QAbstractProxyModel *>(completionModel);

   221     if (!proxy)

   222         return;

   223     QModelIndex sourceIndex = proxy->mapToSource(index);

   224     treeView->selectionModel()->select(sourceIndex, QItemSelectionModel::ClearAndSelect | QItemSelectionModel::Rows);

   225     treeView->scrollTo(index);

   226 }

   227 

   228 //! [6]

   229 void MainWindow::about()

   230 {

   231     QMessageBox::about(this, tr("About"), tr("This example demonstrates how "

   232         "to use a QCompleter with a custom tree model."));

   233 }

   234 //! [6]

   235 

   236 //! [7]

   237 void MainWindow::changeCase(int cs)

   238 {

   239     completer->setCaseSensitivity(cs ? Qt::CaseSensitive : Qt::CaseInsensitive);

   240 }

   241 //! [7]

   242 

   243 void MainWindow::updateContentsLabel(const QString& sep)

   244 {

   245     contentsLabel->setText(QString(tr("Type path from model above with items at each level separated by a '%1'")).arg(sep));

   246 }

   247