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https://github.com/crystalidea/qt6windows7.git
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61 lines
1.7 KiB
C++
61 lines
1.7 KiB
C++
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// Copyright (C) 2016 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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#include "starrating.h"
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#include <QtWidgets>
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#include <cmath>
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constexpr int PaintingScaleFactor = 20;
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//! [0]
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StarRating::StarRating(int starCount, int maxStarCount)
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: myStarCount(starCount),
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myMaxStarCount(maxStarCount)
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{
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starPolygon << QPointF(1.0, 0.5);
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for (int i = 1; i < 5; ++i)
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starPolygon << QPointF(0.5 + 0.5 * std::cos(0.8 * i * 3.14),
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0.5 + 0.5 * std::sin(0.8 * i * 3.14));
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diamondPolygon << QPointF(0.4, 0.5) << QPointF(0.5, 0.4)
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<< QPointF(0.6, 0.5) << QPointF(0.5, 0.6)
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<< QPointF(0.4, 0.5);
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}
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//! [0]
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//! [1]
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QSize StarRating::sizeHint() const
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{
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return PaintingScaleFactor * QSize(myMaxStarCount, 1);
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}
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//! [1]
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//! [2]
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void StarRating::paint(QPainter *painter, const QRect &rect,
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const QPalette &palette, EditMode mode) const
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{
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painter->save();
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painter->setRenderHint(QPainter::Antialiasing, true);
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painter->setPen(Qt::NoPen);
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painter->setBrush(mode == EditMode::Editable ?
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palette.highlight() :
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palette.windowText());
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const int yOffset = (rect.height() - PaintingScaleFactor) / 2;
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painter->translate(rect.x(), rect.y() + yOffset);
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painter->scale(PaintingScaleFactor, PaintingScaleFactor);
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for (int i = 0; i < myMaxStarCount; ++i) {
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if (i < myStarCount)
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painter->drawPolygon(starPolygon, Qt::WindingFill);
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else if (mode == EditMode::Editable)
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painter->drawPolygon(diamondPolygon, Qt::WindingFill);
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painter->translate(1.0, 0.0);
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}
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painter->restore();
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}
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//! [2]
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