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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <math.h>
+#include <QtGui>
+
+#ifndef M_PI
+#define M_PI 3.1415927
+#endif
+
+#include "pieview.h"
+
+PieView::PieView(QWidget *parent)
+    : QAbstractItemView(parent)
+{
+    horizontalScrollBar()->setRange(0, 0);
+    verticalScrollBar()->setRange(0, 0);
+
+    margin = 8;
+    totalSize = 300;
+    pieSize = totalSize - 2*margin;
+    validItems = 0;
+    totalValue = 0.0;
+    rubberBand = 0;
+}
+
+void PieView::dataChanged(const QModelIndex &topLeft,
+                          const QModelIndex &bottomRight)
+{
+    QAbstractItemView::dataChanged(topLeft, bottomRight);
+
+    validItems = 0;
+    totalValue = 0.0;
+
+    for (int row = 0; row < model()->rowCount(rootIndex()); ++row) {
+
+        QModelIndex index = model()->index(row, 1, rootIndex());
+        double value = model()->data(index).toDouble();
+
+        if (value > 0.0) {
+            totalValue += value;
+            validItems++;
+        }
+    }
+    viewport()->update();
+}
+
+bool PieView::edit(const QModelIndex &index, EditTrigger trigger, QEvent *event)
+{
+    if (index.column() == 0)
+        return QAbstractItemView::edit(index, trigger, event);
+    else
+        return false;
+}
+
+/*
+    Returns the item that covers the coordinate given in the view.
+*/
+
+QModelIndex PieView::indexAt(const QPoint &point) const
+{
+    if (validItems == 0)
+        return QModelIndex();
+
+    // Transform the view coordinates into contents widget coordinates.
+    int wx = point.x() + horizontalScrollBar()->value();
+    int wy = point.y() + verticalScrollBar()->value();
+
+    if (wx < totalSize) {
+        double cx = wx - totalSize/2;
+        double cy = totalSize/2 - wy; // positive cy for items above the center
+
+        // Determine the distance from the center point of the pie chart.
+        double d = pow(pow(cx, 2) + pow(cy, 2), 0.5);
+
+        if (d == 0 || d > pieSize/2)
+            return QModelIndex();
+
+        // Determine the angle of the point.
+        double angle = (180 / M_PI) * acos(cx/d);
+        if (cy < 0)
+            angle = 360 - angle;
+
+        // Find the relevant slice of the pie.
+        double startAngle = 0.0;
+
+        for (int row = 0; row < model()->rowCount(rootIndex()); ++row) {
+
+            QModelIndex index = model()->index(row, 1, rootIndex());
+            double value = model()->data(index).toDouble();
+
+            if (value > 0.0) {
+                double sliceAngle = 360*value/totalValue;
+
+                if (angle >= startAngle && angle < (startAngle + sliceAngle))
+                    return model()->index(row, 1, rootIndex());
+
+                startAngle += sliceAngle;
+            }
+        }
+    } else {
+        double itemHeight = QFontMetrics(viewOptions().font).height();
+        int listItem = int((wy - margin) / itemHeight);
+        int validRow = 0;
+
+        for (int row = 0; row < model()->rowCount(rootIndex()); ++row) {
+
+            QModelIndex index = model()->index(row, 1, rootIndex());
+            if (model()->data(index).toDouble() > 0.0) {
+
+                if (listItem == validRow)
+                    return model()->index(row, 0, rootIndex());
+
+                // Update the list index that corresponds to the next valid row.
+                validRow++;
+            }
+        }
+    }
+
+    return QModelIndex();
+}
+
+bool PieView::isIndexHidden(const QModelIndex & /*index*/) const
+{
+    return false;
+}
+
+/*
+    Returns the rectangle of the item at position \a index in the
+    model. The rectangle is in contents coordinates.
+*/
+
+QRect PieView::itemRect(const QModelIndex &index) const
+{
+    if (!index.isValid())
+        return QRect();
+
+    // Check whether the index's row is in the list of rows represented
+    // by slices.
+    QModelIndex valueIndex;
+
+    if (index.column() != 1)
+        valueIndex = model()->index(index.row(), 1, rootIndex());
+    else
+        valueIndex = index;
+
+    if (model()->data(valueIndex).toDouble() > 0.0) {
+
+        int listItem = 0;
+        for (int row = index.row()-1; row >= 0; --row) {
+            if (model()->data(model()->index(row, 1, rootIndex())).toDouble() > 0.0)
+                listItem++;
+        }
+
+        double itemHeight;
+
+        switch (index.column()) {
+        case 0:
+            itemHeight = QFontMetrics(viewOptions().font).height();
+
+            return QRect(totalSize,
+                         int(margin + listItem*itemHeight),
+                         totalSize - margin, int(itemHeight));
+        case 1:
+            return viewport()->rect();
+        }
+
+    }
+    return QRect();
+}
+
+QRegion PieView::itemRegion(const QModelIndex &index) const
+{
+    if (!index.isValid())
+        return QRegion();
+
+    if (index.column() != 1)
+        return itemRect(index);
+
+    if (model()->data(index).toDouble() <= 0.0)
+        return QRegion();
+
+    double startAngle = 0.0;
+    for (int row = 0; row < model()->rowCount(rootIndex()); ++row) {
+
+        QModelIndex sliceIndex = model()->index(row, 1, rootIndex());
+        double value = model()->data(sliceIndex).toDouble();
+
+        if (value > 0.0) {
+            double angle = 360*value/totalValue;
+
+            if (sliceIndex == index) {
+                QPainterPath slicePath;
+                slicePath.moveTo(totalSize/2, totalSize/2);
+                slicePath.arcTo(margin, margin, margin+pieSize, margin+pieSize,
+                                startAngle, angle);
+                slicePath.closeSubpath();
+
+                return QRegion(slicePath.toFillPolygon().toPolygon());
+            }
+
+            startAngle += angle;
+        }
+    }
+
+    return QRegion();
+}
+
+int PieView::horizontalOffset() const
+{
+    return horizontalScrollBar()->value();
+}
+
+void PieView::mousePressEvent(QMouseEvent *event)
+{
+    QAbstractItemView::mousePressEvent(event);
+    origin = event->pos();
+    if (!rubberBand)
+        rubberBand = new QRubberBand(QRubberBand::Rectangle, this);
+    rubberBand->setGeometry(QRect(origin, QSize()));
+    rubberBand->show();
+}
+
+void PieView::mouseMoveEvent(QMouseEvent *event)
+{
+    if (rubberBand)
+        rubberBand->setGeometry(QRect(origin, event->pos()).normalized());
+    QAbstractItemView::mouseMoveEvent(event);
+}
+
+void PieView::mouseReleaseEvent(QMouseEvent *event)
+{
+    QAbstractItemView::mouseReleaseEvent(event);
+    if (rubberBand)
+        rubberBand->hide();
+    viewport()->update();
+}
+
+QModelIndex PieView::moveCursor(QAbstractItemView::CursorAction cursorAction,
+                                Qt::KeyboardModifiers /*modifiers*/)
+{
+    QModelIndex current = currentIndex();
+
+    switch (cursorAction) {
+        case MoveLeft:
+        case MoveUp:
+            if (current.row() > 0)
+                current = model()->index(current.row() - 1, current.column(),
+                                         rootIndex());
+            else
+                current = model()->index(0, current.column(), rootIndex());
+            break;
+        case MoveRight:
+        case MoveDown:
+            if (current.row() < rows(current) - 1)
+                current = model()->index(current.row() + 1, current.column(),
+                                         rootIndex());
+            else
+                current = model()->index(rows(current) - 1, current.column(),
+                                         rootIndex());
+            break;
+        default:
+            break;
+    }
+
+    viewport()->update();
+    return current;
+}
+
+void PieView::paintEvent(QPaintEvent *event)
+{
+    QItemSelectionModel *selections = selectionModel();
+    QStyleOptionViewItem option = viewOptions();
+    QStyle::State state = option.state;
+
+    QBrush background = option.palette.base();
+    QPen foreground(option.palette.color(QPalette::WindowText));
+    QPen textPen(option.palette.color(QPalette::Text));
+    QPen highlightedPen(option.palette.color(QPalette::HighlightedText));
+
+    QPainter painter(viewport());
+    painter.setRenderHint(QPainter::Antialiasing);
+
+    painter.fillRect(event->rect(), background);
+    painter.setPen(foreground);
+
+    // Viewport rectangles
+    QRect pieRect = QRect(margin, margin, pieSize, pieSize);
+    QPoint keyPoint = QPoint(totalSize - horizontalScrollBar()->value(),
+                             margin - verticalScrollBar()->value());
+
+    if (validItems > 0) {
+
+        painter.save();
+        painter.translate(pieRect.x() - horizontalScrollBar()->value(),
+                          pieRect.y() - verticalScrollBar()->value());
+        painter.drawEllipse(0, 0, pieSize, pieSize);
+        double startAngle = 0.0;
+        int row;
+
+        for (row = 0; row < model()->rowCount(rootIndex()); ++row) {
+
+            QModelIndex index = model()->index(row, 1, rootIndex());
+            double value = model()->data(index).toDouble();
+
+            if (value > 0.0) {
+                double angle = 360*value/totalValue;
+
+                QModelIndex colorIndex = model()->index(row, 0, rootIndex());
+                QColor color = QColor(model()->data(colorIndex,
+                                Qt::DecorationRole).toString());
+
+                if (currentIndex() == index)
+                    painter.setBrush(QBrush(color, Qt::Dense4Pattern));
+                else if (selections->isSelected(index))
+                    painter.setBrush(QBrush(color, Qt::Dense3Pattern));
+                else
+                    painter.setBrush(QBrush(color));
+
+                painter.drawPie(0, 0, pieSize, pieSize, int(startAngle*16),
+                                int(angle*16));
+
+                startAngle += angle;
+            }
+        }
+        painter.restore();
+
+        int keyNumber = 0;
+
+        for (row = 0; row < model()->rowCount(rootIndex()); ++row) {
+
+            QModelIndex index = model()->index(row, 1, rootIndex());
+            double value = model()->data(index).toDouble();
+
+            if (value > 0.0) {
+                QModelIndex labelIndex = model()->index(row, 0, rootIndex());
+
+                QStyleOptionViewItem option = viewOptions();
+                option.rect = visualRect(labelIndex);
+                if (selections->isSelected(labelIndex))
+                    option.state |= QStyle::State_Selected;
+                if (currentIndex() == labelIndex)
+                    option.state |= QStyle::State_HasFocus;
+                itemDelegate()->paint(&painter, option, labelIndex);
+
+                keyNumber++;
+            }
+        }
+    }
+}
+
+void PieView::resizeEvent(QResizeEvent * /* event */)
+{
+    updateGeometries();
+}
+
+int PieView::rows(const QModelIndex &index) const
+{
+    return model()->rowCount(model()->parent(index));
+}
+
+void PieView::rowsInserted(const QModelIndex &parent, int start, int end)
+{
+    for (int row = start; row <= end; ++row) {
+
+        QModelIndex index = model()->index(row, 1, rootIndex());
+        double value = model()->data(index).toDouble();
+
+        if (value > 0.0) {
+            totalValue += value;
+            validItems++;
+        }
+    }
+
+    QAbstractItemView::rowsInserted(parent, start, end);
+}
+
+void PieView::rowsAboutToBeRemoved(const QModelIndex &parent, int start, int end)
+{
+    for (int row = start; row <= end; ++row) {
+
+        QModelIndex index = model()->index(row, 1, rootIndex());
+        double value = model()->data(index).toDouble();
+        if (value > 0.0) {
+            totalValue -= value;
+            validItems--;
+        }
+    }
+
+    QAbstractItemView::rowsAboutToBeRemoved(parent, start, end);
+}
+
+void PieView::scrollContentsBy(int dx, int dy)
+{
+    viewport()->scroll(dx, dy);
+}
+
+void PieView::scrollTo(const QModelIndex &index, ScrollHint)
+{
+    QRect area = viewport()->rect();
+    QRect rect = visualRect(index);
+
+    if (rect.left() < area.left())
+        horizontalScrollBar()->setValue(
+            horizontalScrollBar()->value() + rect.left() - area.left());
+    else if (rect.right() > area.right())
+        horizontalScrollBar()->setValue(
+            horizontalScrollBar()->value() + qMin(
+                rect.right() - area.right(), rect.left() - area.left()));
+
+    if (rect.top() < area.top())
+        verticalScrollBar()->setValue(
+            verticalScrollBar()->value() + rect.top() - area.top());
+    else if (rect.bottom() > area.bottom())
+        verticalScrollBar()->setValue(
+            verticalScrollBar()->value() + qMin(
+                rect.bottom() - area.bottom(), rect.top() - area.top()));
+
+    update();
+}
+
+/*
+    Find the indices corresponding to the extent of the selection.
+*/
+
+void PieView::setSelection(const QRect &rect, QItemSelectionModel::SelectionFlags command)
+{
+    // Use content widget coordinates because we will use the itemRegion()
+    // function to check for intersections.
+
+    QRect contentsRect = rect.translated(
+                            horizontalScrollBar()->value(),
+                            verticalScrollBar()->value()).normalized();
+
+    int rows = model()->rowCount(rootIndex());
+    int columns = model()->columnCount(rootIndex());
+    QModelIndexList indexes;
+
+    for (int row = 0; row < rows; ++row) {
+        for (int column = 0; column < columns; ++column) {
+            QModelIndex index = model()->index(row, column, rootIndex());
+            QRegion region = itemRegion(index);
+            if (!region.intersect(contentsRect).isEmpty())
+                indexes.append(index);
+        }
+    }
+
+    if (indexes.size() > 0) {
+        int firstRow = indexes[0].row();
+        int lastRow = indexes[0].row();
+        int firstColumn = indexes[0].column();
+        int lastColumn = indexes[0].column();
+
+        for (int i = 1; i < indexes.size(); ++i) {
+            firstRow = qMin(firstRow, indexes[i].row());
+            lastRow = qMax(lastRow, indexes[i].row());
+            firstColumn = qMin(firstColumn, indexes[i].column());
+            lastColumn = qMax(lastColumn, indexes[i].column());
+        }
+
+        QItemSelection selection(
+            model()->index(firstRow, firstColumn, rootIndex()),
+            model()->index(lastRow, lastColumn, rootIndex()));
+        selectionModel()->select(selection, command);
+    } else {
+        QModelIndex noIndex;
+        QItemSelection selection(noIndex, noIndex);
+        selectionModel()->select(selection, command);
+    }
+
+    update();
+}
+
+void PieView::updateGeometries()
+{
+    horizontalScrollBar()->setPageStep(viewport()->width());
+    horizontalScrollBar()->setRange(0, qMax(0, 2*totalSize - viewport()->width()));
+    verticalScrollBar()->setPageStep(viewport()->height());
+    verticalScrollBar()->setRange(0, qMax(0, totalSize - viewport()->height()));
+}
+
+int PieView::verticalOffset() const
+{
+    return verticalScrollBar()->value();
+}
+
+/*
+    Returns the position of the item in viewport coordinates.
+*/
+
+QRect PieView::visualRect(const QModelIndex &index) const
+{
+    QRect rect = itemRect(index);
+    if (rect.isValid())
+        return QRect(rect.left() - horizontalScrollBar()->value(),
+                     rect.top() - verticalScrollBar()->value(),
+                     rect.width(), rect.height());
+    else
+        return rect;
+}
+
+/*
+    Returns a region corresponding to the selection in viewport coordinates.
+*/
+
+QRegion PieView::visualRegionForSelection(const QItemSelection &selection) const
+{
+    int ranges = selection.count();
+
+    if (ranges == 0)
+        return QRect();
+
+    QRegion region;
+    for (int i = 0; i < ranges; ++i) {
+        QItemSelectionRange range = selection.at(i);
+        for (int row = range.top(); row <= range.bottom(); ++row) {
+            for (int col = range.left(); col <= range.right(); ++col) {
+                QModelIndex index = model()->index(row, col, rootIndex());
+                region += visualRect(index);
+            }
+        }
+    }
+    return region;
+}