starrating.cpp Example File

itemviews/stardelegate/starrating.cpp
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#include <QtWidgets> #include <cmath> #include "starrating.h" const int PaintingScaleFactor = 20; StarRating::StarRating(int starCount, int maxStarCount) { myStarCount = starCount; myMaxStarCount = maxStarCount; starPolygon << QPointF(1.0, 0.5); for (int i = 1; i < 5; ++i) starPolygon << QPointF(0.5 + 0.5 * std::cos(0.8 * i * 3.14), 0.5 + 0.5 * std::sin(0.8 * i * 3.14)); diamondPolygon << QPointF(0.4, 0.5) << QPointF(0.5, 0.4) << QPointF(0.6, 0.5) << QPointF(0.5, 0.6) << QPointF(0.4, 0.5); } QSize StarRating::sizeHint() const { return PaintingScaleFactor * QSize(myMaxStarCount, 1); } void StarRating::paint(QPainter *painter, const QRect &rect, const QPalette &palette, EditMode mode) const { painter->save(); painter->setRenderHint(QPainter::Antialiasing, true); painter->setPen(Qt::NoPen); if (mode == Editable) { painter->setBrush(palette.highlight()); } else { painter->setBrush(palette.foreground()); } int yOffset = (rect.height() - PaintingScaleFactor) / 2; painter->translate(rect.x(), rect.y() + yOffset); painter->scale(PaintingScaleFactor, PaintingScaleFactor); for (int i = 0; i < myMaxStarCount; ++i) { if (i < myStarCount) { painter->drawPolygon(starPolygon, Qt::WindingFill); } else if (mode == Editable) { painter->drawPolygon(diamondPolygon, Qt::WindingFill); } painter->translate(1.0, 0.0); } painter->restore(); }