63 lines
2.2 KiB
C++
63 lines
2.2 KiB
C++
#include "FluRectangle.h"
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#include <QPainterPath>
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FluRectangle::FluRectangle(QQuickItem *parent) : QQuickPaintedItem(parent) {
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color(Qt::white);
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radius({0, 0, 0, 0});
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borderWidth(0);
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borderColor(Qt::black);
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connect(this, &FluRectangle::colorChanged, this, [=] { update(); });
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connect(this, &FluRectangle::radiusChanged, this, [=] { update(); });
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connect(this, &FluRectangle::borderWidthChanged, this, [=] { update(); });
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connect(this, &FluRectangle::borderColorChanged, this, [=] { update(); });
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}
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bool FluRectangle::borderValid() const {
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return qRound(_borderWidth) >= 1 && _color.isValid() && _color.alpha() > 0;
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}
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void FluRectangle::paint(QPainter *painter) {
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painter->save();
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painter->setRenderHint(QPainter::Antialiasing);
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QRectF rect = boundingRect();
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bool valid = borderValid();
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if (valid) {
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// 绘制边框时画笔的宽度从路径向两侧扩充
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// 因此实际绘制的矩形应向内侧收缩边框宽度的一半，避免边框裁剪导致不完整
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qreal halfBorderWidth = _borderWidth / 2.0;
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rect.adjust(halfBorderWidth, halfBorderWidth, -halfBorderWidth, -halfBorderWidth);
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}
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QPainterPath path;
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QList<int> r = _radius;
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while (r.size() < 4) {
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r.append(0);
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}
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// 从右下角开始逆时针绘制圆角矩形路径
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path.moveTo(rect.bottomRight() - QPointF(0, r[2]));
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path.lineTo(rect.topRight() + QPointF(0, r[1]));
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path.arcTo(QRectF(QPointF(rect.topRight() - QPointF(r[1] * 2, 0)), QSize(r[1] * 2, r[1] * 2)), 0, 90);
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path.lineTo(rect.topLeft() + QPointF(r[0], 0));
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path.arcTo(QRectF(QPointF(rect.topLeft()), QSize(r[0] * 2, r[0] * 2)), 90, 90);
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path.lineTo(rect.bottomLeft() - QPointF(0, r[3]));
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path.arcTo(QRectF(QPointF(rect.bottomLeft() - QPointF(0, r[3] * 2)), QSize(r[3] * 2, r[3] * 2)), 180, 90);
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path.lineTo(rect.bottomRight() - QPointF(r[2], 0));
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path.arcTo(QRectF(QPointF(rect.bottomRight() - QPointF(r[2] * 2, r[2] * 2)), QSize(r[2] * 2, r[2] * 2)), 270, 90);
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// 填充背景
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painter->fillPath(path, _color);
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// 绘制边框
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if (valid) {
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painter->strokePath(path, QPen(_borderColor, _borderWidth));
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}
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painter->restore();
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}
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