bookdelegate.cpp Example File

books/bookdelegate.cpp
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#include "bookdelegate.h" #include <QtWidgets> BookDelegate::BookDelegate(QObject *parent) : QSqlRelationalDelegate(parent), star(QPixmap(":images/star.png")) { } void BookDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const { if (index.column() != 5) { QStyleOptionViewItem opt = option; // Since we draw the grid ourselves: opt.rect.adjust(0, 0, -1, -1); QSqlRelationalDelegate::paint(painter, opt, index); } else { const QAbstractItemModel *model = index.model(); QPalette::ColorGroup cg = (option.state & QStyle::State_Enabled) ? (option.state & QStyle::State_Active) ? QPalette::Normal : QPalette::Inactive : QPalette::Disabled; if (option.state & QStyle::State_Selected) painter->fillRect( option.rect, option.palette.color(cg, QPalette::Highlight)); int rating = model->data(index, Qt::DisplayRole).toInt(); int width = star.width(); int height = star.height(); int x = option.rect.x(); int y = option.rect.y() + (option.rect.height() / 2) - (height / 2); for (int i = 0; i < rating; ++i) { painter->drawPixmap(x, y, star); x += width; } // Since we draw the grid ourselves: drawFocus(painter, option, option.rect.adjusted(0, 0, -1, -1)); } QPen pen = painter->pen(); painter->setPen(option.palette.color(QPalette::Mid)); painter->drawLine(option.rect.bottomLeft(), option.rect.bottomRight()); painter->drawLine(option.rect.topRight(), option.rect.bottomRight()); painter->setPen(pen); } QSize BookDelegate::sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const { if (index.column() == 5) return QSize(5 * star.width(), star.height()) + QSize(1, 1); // Since we draw the grid ourselves: return QSqlRelationalDelegate::sizeHint(option, index) + QSize(1, 1); } bool BookDelegate::editorEvent(QEvent *event, QAbstractItemModel *model, const QStyleOptionViewItem &option, const QModelIndex &index) { if (index.column() != 5) return QSqlRelationalDelegate::editorEvent(event, model, option, index); if (event->type() == QEvent::MouseButtonPress) { QMouseEvent *mouseEvent = static_cast<QMouseEvent*>(event); int stars = qBound(0, int(0.7 + qreal(mouseEvent->pos().x() - option.rect.x()) / star.width()), 5); model->setData(index, QVariant(stars)); // So that the selection can change: return false; } return true; } QWidget *BookDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const { if (index.column() != 4) return QSqlRelationalDelegate::createEditor(parent, option, index); // For editing the year, return a spinbox with a range from -1000 to 2100. QSpinBox *sb = new QSpinBox(parent); sb->setFrame(false); sb->setMaximum(2100); sb->setMinimum(-1000); return sb; }