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#include <QtGui>

#include "treemodelcompleter.h"

#include "mainwindow.h"

//! [0]

MainWindow::MainWindow(QWidget *parent)

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

{

    createMenu();

    completer = new TreeModelCompleter(this);

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

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

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

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

    QWidget *centralWidget = new QWidget;

    QLabel *modelLabel = new QLabel;

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

    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);

//! [0]

//! [1]

    QLabel *separatorLabel = new QLabel;

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

    QLineEdit *separatorLineEdit = new QLineEdit;

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

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

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

    QCheckBox *wrapCheckBox = new QCheckBox;

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

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

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

    contentsLabel = new QLabel;

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

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

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

    treeView = new QTreeView;

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

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

    treeView->expandAll();

//! [1]

//! [2]

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

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

    lineEdit = new QLineEdit;

    lineEdit->setCompleter(completer);

//! [2]

//! [3]

    QGridLayout *layout = new QGridLayout;

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

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

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

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

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

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

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

    centralWidget->setLayout(layout);

    setCentralWidget(centralWidget);

    changeCase(caseCombo->currentIndex());

    changeMode(modeCombo->currentIndex());

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

    lineEdit->setFocus();

}

//! [3]

//! [4]

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);

}

//! [4]

//! [5]

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);

}

//! [5]

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

{

    QFile file(fileName);

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

        return new QStringListModel(completer);

#ifndef QT_NO_CURSOR

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

#endif

    QStringList words;

    QStandardItemModel *model = new QStandardItemModel(completer);

    QVector<QStandardItem *> parents(10);

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

    while (!file.atEnd()) {

        QString line = file.readLine();

        QString trimmedLine = line.trimmed();

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

            continue;

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

        int nonws = re.indexIn(line);

        int level = 0;

        if (nonws == -1) {

            level = 0;

        } else {

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

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

            } else {

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

            }

        }

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

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

        QStandardItem *item = new QStandardItem;

        item->setText(trimmedLine);

        parents[level]->appendRow(item);

        parents[level+1] = item;

    }

#ifndef QT_NO_CURSOR

    QApplication::restoreOverrideCursor();

#endif

    return model;

}

void MainWindow::highlight(const QModelIndex &index)

{

    QAbstractItemModel *completionModel = completer->completionModel();

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

    if (!proxy)

        return;

    QModelIndex sourceIndex = proxy->mapToSource(index);

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

    treeView->scrollTo(index);

}

//! [6]

void MainWindow::about()

{

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

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

}

//! [6]

//! [7]

void MainWindow::changeCase(int cs)

{

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

}

//! [7]

void MainWindow::updateContentsLabel(const QString& sep)

{

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

}