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# window.cpp Example File
painting/basicdrawing/window.cpp

        #include <QtGui>

        #include "renderarea.h"
        #include "window.h"

        const int IdRole = QAbstractItemModel::UserRole;

        Window::Window()
        {
            renderArea = new RenderArea(this);

            shapeComboBox = new QComboBox(this);
            addItem(shapeComboBox, tr("Rectangle"), RenderArea::Rect);
            addItem(shapeComboBox, tr("Round Rectangle"), RenderArea::RoundRect);
            addItem(shapeComboBox, tr("Ellipse"), RenderArea::Ellipse);
            addItem(shapeComboBox, tr("Pie"), RenderArea::Pie);
            addItem(shapeComboBox, tr("Chord"), RenderArea::Chord);
            addItem(shapeComboBox, tr("Polygon"), RenderArea::Polygon);
            addItem(shapeComboBox, tr("Path"), RenderArea::Path);
            addItem(shapeComboBox, tr("Line"), RenderArea::Line);
            addItem(shapeComboBox, tr("Polyline"), RenderArea::Polyline);
            addItem(shapeComboBox, tr("Arc"), RenderArea::Arc);
            addItem(shapeComboBox, tr("Points"), RenderArea::Points);
            addItem(shapeComboBox, tr("Text"), RenderArea::Text);
            addItem(shapeComboBox, tr("Pixmap"), RenderArea::Pixmap);

            shapeLabel = new QLabel(tr("&Shape:"), this);
            shapeLabel->setBuddy(shapeComboBox);

            penWidthSpinBox = new QSpinBox(this);
            penWidthSpinBox->setRange(0, 20);

            penWidthLabel = new QLabel(tr("Pen &Width:"), this);
            penWidthLabel->setBuddy(penWidthSpinBox);

            penStyleComboBox = new QComboBox(this);
            addItem(penStyleComboBox, tr("Solid"), Qt::SolidLine);
            addItem(penStyleComboBox, tr("Dash"), Qt::DashLine);
            addItem(penStyleComboBox, tr("Dot"), Qt::DotLine);
            addItem(penStyleComboBox, tr("Dash Dot"), Qt::DashDotLine);
            addItem(penStyleComboBox, tr("Dash Dot Dot"), Qt::DashDotDotLine);
            addItem(penStyleComboBox, tr("None"), Qt::NoPen);

            penStyleLabel = new QLabel(tr("&Pen Style:"), this);
            penStyleLabel->setBuddy(penStyleComboBox);

            penCapComboBox = new QComboBox(this);
            addItem(penCapComboBox, tr("Flat"), Qt::FlatCap);
            addItem(penCapComboBox, tr("Square"), Qt::SquareCap);
            addItem(penCapComboBox, tr("Round"), Qt::RoundCap);

            penCapLabel = new QLabel(tr("Pen &Cap:"), this);
            penCapLabel->setBuddy(penCapComboBox);

            penJoinComboBox = new QComboBox(this);
            addItem(penJoinComboBox, tr("Miter"), Qt::MiterJoin);
            addItem(penJoinComboBox, tr("Bevel"), Qt::BevelJoin);
            addItem(penJoinComboBox, tr("Round"), Qt::RoundJoin);

            penJoinLabel = new QLabel(tr("Pen &Join:"), this);
            penJoinLabel->setBuddy(penJoinComboBox);

            brushStyleComboBox = new QComboBox(this);
            addItem(brushStyleComboBox, tr("Linear Gradient"),
                    Qt::LinearGradientPattern);
            addItem(brushStyleComboBox, tr("Texture"), Qt::TexturePattern);
            addItem(brushStyleComboBox, tr("Solid"), Qt::SolidPattern);
            addItem(brushStyleComboBox, tr("Horizontal"), Qt::HorPattern);
            addItem(brushStyleComboBox, tr("Verical"), Qt::VerPattern);
            addItem(brushStyleComboBox, tr("Cross"), Qt::CrossPattern);
            addItem(brushStyleComboBox, tr("Backward Diagonal"), Qt::BDiagPattern);
            addItem(brushStyleComboBox, tr("Forward Diagonal"), Qt::FDiagPattern);
            addItem(brushStyleComboBox, tr("Diagonal Cross"), Qt::DiagCrossPattern);
            addItem(brushStyleComboBox, tr("Dense 1"), Qt::Dense1Pattern);
            addItem(brushStyleComboBox, tr("Dense 2"), Qt::Dense2Pattern);
            addItem(brushStyleComboBox, tr("Dense 3"), Qt::Dense3Pattern);
            addItem(brushStyleComboBox, tr("Dense 4"), Qt::Dense4Pattern);
            addItem(brushStyleComboBox, tr("Dense 5"), Qt::Dense5Pattern);
            addItem(brushStyleComboBox, tr("Dense 6"), Qt::Dense6Pattern);
            addItem(brushStyleComboBox, tr("Dense 7"), Qt::Dense7Pattern);
            addItem(brushStyleComboBox, tr("None"), Qt::NoBrush);

            brushStyleLabel = new QLabel(tr("&Brush Style:"), this);
            brushStyleLabel->setBuddy(brushStyleComboBox);

            antialiasingCheckBox = new QCheckBox(tr("&Antialiasing"), this);
            transformationsCheckBox = new QCheckBox(tr("&Transformations"), this);

            connect(shapeComboBox, SIGNAL(activated(int)),
                    this, SLOT(shapeChanged()));
            connect(penWidthSpinBox, SIGNAL(valueChanged(int)),
                    this, SLOT(penChanged()));
            connect(penStyleComboBox, SIGNAL(activated(int)),
                    this, SLOT(penChanged()));
            connect(penCapComboBox, SIGNAL(activated(int)),
                    this, SLOT(penChanged()));
            connect(penJoinComboBox, SIGNAL(activated(int)),
                    this, SLOT(penChanged()));
            connect(brushStyleComboBox, SIGNAL(activated(int)),
                    this, SLOT(brushChanged()));
            connect(antialiasingCheckBox, SIGNAL(toggled(bool)),
                    renderArea, SLOT(setAntialiased(bool)));
            connect(transformationsCheckBox, SIGNAL(toggled(bool)),
                    renderArea, SLOT(setTransformed(bool)));

            QHBoxLayout *checkBoxLayout = new QHBoxLayout;
            checkBoxLayout->addWidget(antialiasingCheckBox);
            checkBoxLayout->addWidget(transformationsCheckBox);

            QGridLayout *mainLayout = new QGridLayout(this);
            mainLayout->addWidget(renderArea, 0, 0, 1, 2);
            mainLayout->addWidget(shapeLabel, 1, 0);
            mainLayout->addWidget(shapeComboBox, 1, 1);
            mainLayout->addWidget(penWidthLabel, 2, 0);
            mainLayout->addWidget(penWidthSpinBox, 2, 1);
            mainLayout->addWidget(penStyleLabel, 3, 0);
            mainLayout->addWidget(penStyleComboBox, 3, 1);
            mainLayout->addWidget(penCapLabel, 4, 0);
            mainLayout->addWidget(penCapComboBox, 4, 1);
            mainLayout->addWidget(penJoinLabel, 5, 0);
            mainLayout->addWidget(penJoinComboBox, 5, 1);
            mainLayout->addWidget(brushStyleLabel, 6, 0);
            mainLayout->addWidget(brushStyleComboBox, 6, 1);
            mainLayout->addLayout(checkBoxLayout, 7, 0, 1, 2);

            shapeChanged();
            penChanged();
            brushChanged();
            penChanged();
            renderArea->setAntialiased(false);
            renderArea->setTransformed(false);

            setWindowTitle(tr("Basic Drawing"));
        }

        void Window::shapeChanged()
        {
            RenderArea::Shape shape =
                (RenderArea::Shape)shapeComboBox->itemData(shapeComboBox->currentIndex(), IdRole).toInt();
            renderArea->setShape(shape);
        }

        void Window::penChanged()
        {
            int width = penWidthSpinBox->value();
            Qt::PenStyle style =
                (Qt::PenStyle)penStyleComboBox->itemData(penStyleComboBox->currentIndex(), IdRole).toInt();
            Qt::PenCapStyle cap =
                (Qt::PenCapStyle)penCapComboBox->itemData(penCapComboBox->currentIndex(), IdRole).toInt();
            Qt::PenJoinStyle join =
                (Qt::PenJoinStyle)penJoinComboBox->itemData(penJoinComboBox->currentIndex(), IdRole).toInt();

            renderArea->setPen(QPen(Qt::blue, width, style, cap, join));
        }

        void Window::brushChanged()
        {
            Qt::BrushStyle style =
                (Qt::BrushStyle)brushStyleComboBox->itemData(brushStyleComboBox->currentIndex(), IdRole).toInt();

            if (style == Qt::LinearGradientPattern) {
                QLinearGradient lg(0, 0, 400, 200);
                lg.appendStop(0, Qt::red);
                lg.appendStop(1, Qt::green);
                renderArea->setBrush(lg);
            } else if (style == Qt::TexturePattern) {
                renderArea->setBrush(QBrush(QPixmap(":/images/brick.png")));
            } else {
                renderArea->setBrush(QBrush(Qt::red, style));
            }
        }

        void Window::addItem(QComboBox *comboBox, const QString &text, int id)
        {
            int row = comboBox->count();
            comboBox->insertItem(row, text);
            comboBox->setItemData(row, id, IdRole);
        }