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     2 **

     3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

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     7 ** This file is part of the examples of the Qt Toolkit.

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    16 ** GNU Lesser General Public License Usage

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    18 ** General Public License version 2.1 as published by the Free Software

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    38 ** $QT_END_LICENSE$

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    40 ****************************************************************************/

    41 

    42 #include <QtGui>

    43 

    44 #include "mainwindow.h"

    45 #include "treemodel.h"

    46 

    47 MainWindow::MainWindow(QWidget *parent)

    48     : QMainWindow(parent)

    49 {

    50     setupUi(this);

    51 

    52     QStringList headers;

    53     headers << tr("Title") << tr("Description");

    54 

    55     QFile file(":/default.txt");

    56     file.open(QIODevice::ReadOnly);

    57     TreeModel *model = new TreeModel(headers, file.readAll());

    58     file.close();

    59 

    60     view->setModel(model);

    61     for (int column = 0; column < model->columnCount(); ++column)

    62         view->resizeColumnToContents(column);

    63 

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

    65 

    66     connect(view->selectionModel(),

    67             SIGNAL(selectionChanged(const QItemSelection &,

    68                                     const QItemSelection &)),

    69             this, SLOT(updateActions()));

    70 

    71     connect(actionsMenu, SIGNAL(aboutToShow()), this, SLOT(updateActions()));

    72     connect(insertRowAction, SIGNAL(triggered()), this, SLOT(insertRow()));

    73     connect(insertColumnAction, SIGNAL(triggered()), this, SLOT(insertColumn()));

    74     connect(removeRowAction, SIGNAL(triggered()), this, SLOT(removeRow()));

    75     connect(removeColumnAction, SIGNAL(triggered()), this, SLOT(removeColumn()));

    76     connect(insertChildAction, SIGNAL(triggered()), this, SLOT(insertChild()));

    77 

    78     updateActions();

    79 }

    80 

    81 void MainWindow::insertChild()

    82 {

    83     QModelIndex index = view->selectionModel()->currentIndex();

    84     QAbstractItemModel *model = view->model();

    85 

    86     if (model->columnCount(index) == 0) {

    87         if (!model->insertColumn(0, index))

    88             return;

    89     }

    90 

    91     if (!model->insertRow(0, index))

    92         return;

    93 

    94     for (int column = 0; column < model->columnCount(index); ++column) {

    95         QModelIndex child = model->index(0, column, index);

    96         model->setData(child, QVariant("[No data]"), Qt::EditRole);

    97         if (!model->headerData(column, Qt::Horizontal).isValid())

    98             model->setHeaderData(column, Qt::Horizontal, QVariant("[No header]"),

    99                                  Qt::EditRole);

   100     }

   101 

   102     view->selectionModel()->setCurrentIndex(model->index(0, 0, index),

   103                                             QItemSelectionModel::ClearAndSelect);

   104     updateActions();

   105 }

   106 

   107 bool MainWindow::insertColumn(const QModelIndex &parent)

   108 {

   109     QAbstractItemModel *model = view->model();

   110     int column = view->selectionModel()->currentIndex().column();

   111 

   112     // Insert a column in the parent item.

   113     bool changed = model->insertColumn(column + 1, parent);

   114     if (changed)

   115         model->setHeaderData(column + 1, Qt::Horizontal, QVariant("[No header]"),

   116                              Qt::EditRole);

   117 

   118     updateActions();

   119 

   120     return changed;

   121 }

   122 

   123 void MainWindow::insertRow()

   124 {

   125     QModelIndex index = view->selectionModel()->currentIndex();

   126     QAbstractItemModel *model = view->model();

   127 

   128     if (!model->insertRow(index.row()+1, index.parent()))

   129         return;

   130 

   131     updateActions();

   132 

   133     for (int column = 0; column < model->columnCount(index.parent()); ++column) {

   134         QModelIndex child = model->index(index.row()+1, column, index.parent());

   135         model->setData(child, QVariant("[No data]"), Qt::EditRole);

   136     }

   137 }

   138 

   139 bool MainWindow::removeColumn(const QModelIndex &parent)

   140 {

   141     QAbstractItemModel *model = view->model();

   142     int column = view->selectionModel()->currentIndex().column();

   143 

   144     // Insert columns in each child of the parent item.

   145     bool changed = model->removeColumn(column, parent);

   146 

   147     if (!parent.isValid() && changed)

   148         updateActions();

   149 

   150     return changed;

   151 }

   152 

   153 void MainWindow::removeRow()

   154 {

   155     QModelIndex index = view->selectionModel()->currentIndex();

   156     QAbstractItemModel *model = view->model();

   157     if (model->removeRow(index.row(), index.parent()))

   158         updateActions();

   159 }

   160 

   161 void MainWindow::updateActions()

   162 {

   163     bool hasSelection = !view->selectionModel()->selection().isEmpty();

   164     removeRowAction->setEnabled(hasSelection);

   165     removeColumnAction->setEnabled(hasSelection);

   166 

   167     bool hasCurrent = view->selectionModel()->currentIndex().isValid();

   168     insertRowAction->setEnabled(hasCurrent);

   169     insertColumnAction->setEnabled(hasCurrent);

   170 

   171     if (hasCurrent) {

   172         view->closePersistentEditor(view->selectionModel()->currentIndex());

   173 

   174         int row = view->selectionModel()->currentIndex().row();

   175         int column = view->selectionModel()->currentIndex().column();

   176         if (view->selectionModel()->currentIndex().parent().isValid())

   177             statusBar()->showMessage(tr("Position: (%1,%2)").arg(row).arg(column));

   178         else

   179             statusBar()->showMessage(tr("Position: (%1,%2) in top level").arg(row).arg(column));

   180     }

   181 }