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#include <QtGui>

#include "mainwindow.h"

MainWindow::MainWindow()

{

    QMenu *fileMenu = new QMenu(tr("&File"));

    QAction *quitAction = fileMenu->addAction(tr("E&xit"));

    quitAction->setShortcut(tr("Ctrl+Q"));

    QMenu *itemsMenu = new QMenu(tr("&Items"));

    insertAction = itemsMenu->addAction(tr("&Insert Item"));

    removeAction = itemsMenu->addAction(tr("&Remove Item"));

    removeAction->setEnabled(false);

    itemsMenu->addSeparator();

    ascendingAction = itemsMenu->addAction(tr("Sort in &Ascending Order"));

    descendingAction = itemsMenu->addAction(tr("Sort in &Descending Order"));

    autoSortAction = itemsMenu->addAction(tr("&Automatically Sort Items"));

    autoSortAction->setCheckable(true);

    itemsMenu->addSeparator();

    QAction *findItemsAction = itemsMenu->addAction(tr("&Find Items"));

    findItemsAction->setShortcut(tr("Ctrl+F"));

    menuBar()->addMenu(fileMenu);

    menuBar()->addMenu(itemsMenu);

/*  For convenient quoting:

    QTreeWidget *treeWidget = new QTreeWidget(this);

*/

    treeWidget = new QTreeWidget(this);

    treeWidget->setColumnCount(2);

    QStringList headers;

    headers << tr("Subject") << tr("Default");

    treeWidget->setHeaderLabels(headers);

    connect(quitAction, SIGNAL(triggered()), this, SLOT(close()));

    connect(ascendingAction, SIGNAL(triggered()), this, SLOT(sortAscending()));

    connect(autoSortAction, SIGNAL(triggered()), this, SLOT(updateSortItems()));

    connect(descendingAction, SIGNAL(triggered()), this, SLOT(sortDescending()));

    connect(findItemsAction, SIGNAL(triggered()), this, SLOT(findItems()));

    connect(insertAction, SIGNAL(triggered()), this, SLOT(insertItem()));

    connect(removeAction, SIGNAL(triggered()), this, SLOT(removeItem()));

    connect(treeWidget,

            SIGNAL(currentItemChanged(QTreeWidgetItem *, QTreeWidgetItem *)),

            this, SLOT(updateMenus(QTreeWidgetItem *)));

    setupTreeItems();

    updateMenus(treeWidget->currentItem());

    setCentralWidget(treeWidget);

    setWindowTitle(tr("Tree Widget"));

}

void MainWindow::setupTreeItems()

{

    QTreeWidgetItem *planets = new QTreeWidgetItem(treeWidget);

    planets->setText(0, tr("Planets"));

    (new QTreeWidgetItem(planets))->setText(0, tr("Mercury"));

    (new QTreeWidgetItem(planets))->setText(0, tr("Venus"));

    QTreeWidgetItem *earthItem = new QTreeWidgetItem(planets);

    earthItem->setText(0, tr("Earth"));

    earthItem->setText(1, tr("Yes"));

    (new QTreeWidgetItem(planets))->setText(0, tr("Mars"));

    (new QTreeWidgetItem(planets))->setText(0, tr("Jupiter"));

    (new QTreeWidgetItem(planets))->setText(0, tr("Saturn"));

    (new QTreeWidgetItem(planets))->setText(0, tr("Uranus"));

    (new QTreeWidgetItem(planets))->setText(0, tr("Neptune"));

    (new QTreeWidgetItem(planets))->setText(0, tr("Pluto"));

}

void MainWindow::findItems()

{

    QString itemText = QInputDialog::getText(this, tr("Find Items"),

        tr("Text to find:"));

    if (itemText.isEmpty())

        return;

//! [0]

    QTreeWidgetItemIterator it(treeWidget);

    while (*it) {

        if ((*it)->text(0) == itemText)

            (*it)->setSelected(true);

        ++it;

    }

//! [0]

}

void MainWindow::insertItem()

{

    QTreeWidgetItem *currentItem = treeWidget->currentItem();

    if (!currentItem)

        return;

    QString itemText = QInputDialog::getText(this, tr("Insert Item"),

        tr("Input text for the new item:"));

    if (itemText.isEmpty())

        return;

    QTreeWidgetItem *parent = currentItem->parent();

    QTreeWidgetItem *newItem;

    if (parent)

        newItem = new QTreeWidgetItem(parent, treeWidget->currentItem());

    else

        newItem = new QTreeWidgetItem(treeWidget, treeWidget->currentItem());

    newItem->setText(0, itemText);

}

void MainWindow::removeItem()

{

    QTreeWidgetItem *currentItem = treeWidget->currentItem();

    if (!currentItem)

        return;

    QTreeWidgetItem *parent = currentItem->parent();

    int index;

    if (parent) {

        index = parent->indexOfChild(treeWidget->currentItem());

        delete parent->takeChild(index);

    } else {

        index = treeWidget->indexOfTopLevelItem(treeWidget->currentItem());

        delete treeWidget->takeTopLevelItem(index);

    }

}

void MainWindow::sortAscending()

{

    treeWidget->sortItems(0, Qt::AscendingOrder);

}

void MainWindow::sortDescending()

{

    treeWidget->sortItems(0, Qt::DescendingOrder);

}

void MainWindow::updateMenus(QTreeWidgetItem *current)

{

    insertAction->setEnabled(current != 0);

    removeAction->setEnabled(current != 0);

}

void MainWindow::updateSortItems()

{

    ascendingAction->setEnabled(!autoSortAction->isChecked());

    descendingAction->setEnabled(!autoSortAction->isChecked());

    treeWidget->setSortingEnabled(autoSortAction->isChecked());

}