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1、概述
源码放在文章末尾

该项目实现了带动画效果的多选框，鼠标放在上面或者选中都会呈现炫酷的动画效果，demo演示如下：

项目部分代码如下所示：

#ifndef LINEARCHECKBOX_H
#define LINEARCHECKBOX_H#include <QCheckBox>
#include <QPropertyAnimation>
#include <QPainter>
#include <QPainterPath>
#include <QDebug>class AniCheckBox : public QCheckBox
{Q_OBJECTQ_PROPERTY(double hover_prog READ getHoverProg WRITE setHoverProg)Q_PROPERTY(double part_prog READ getPartProg WRITE setPartProg)Q_PROPERTY(double check_prog READ getCheckProg WRITE setCheckProg)
public:AniCheckBox(QWidget* parent = nullptr);void setForeColor(QColor c);protected:void paintEvent(QPaintEvent *) override;void enterEvent(QEvent *e) override;void leaveEvent(QEvent *e) override;bool hitButton(const QPoint &) const override;virtual void checkStateChanged(int state);virtual void drawBox(QPainter &painter, QRectF rect);QPropertyAnimation* startAnimation(const QByteArray &property, double begin, double end, int duration = 500, QEasingCurve curve = QEasingCurve::OutQuad);protected:double getHoverProg() const;void setHoverProg(double prog);double getPartProg() const;void setPartProg(double prog);double getCheckProg() const;void setCheckProg(double prog);protected:int boxSide = 0; // 选择框边长，0为自适应QColor foreColor = QColor("#2753ff"); // 前景颜色double hoverProg = 0;   // 鼠标移上去的进度double partyProg = 0;   // 部分选中的进度double checkProg = 0;   // 选中的进度
};#endif // LINEARCHECKBOX_H

#include "anicheckbox.h"AniCheckBox::AniCheckBox(QWidget *parent) : QCheckBox(parent)
{setCursor(Qt::PointingHandCursor);connect(this, &QCheckBox::stateChanged, this, [=](int state) {// qInfo() << "状态变化：" << static_cast<Qt::CheckState>(state);checkStateChanged(state);});
}void AniCheckBox::setForeColor(QColor c)
{this->foreColor = c;
}void AniCheckBox::paintEvent(QPaintEvent *)
{// QCheckBox::paintEvent(e);QPainter painter(this);// painter.setRenderHint(QPainter::Antialiasing, true);QRectF rect;double textLeft;if (boxSide <= 0){// 自适应大小：优先一行文字大小，其次按比例const double fixedProp = 0.8; // 默认比例QFontMetricsF fm(painter.font());double side = fm.height(); // 一行文字的高度if (side >= this->height() * fixedProp)side = this->height() * fixedProp;double margin = side / 2;rect = QRectF(margin, (height() - side) / 2, side, side);textLeft = rect.right() + margin;}else{// 固定大小double margin = (this->height() - boxSide) / 2;rect = QRectF(margin, margin, boxSide, boxSide);textLeft = rect.right() + margin;}// 绘制选择框painter.save();drawBox(painter, rect);painter.restore();// 绘制文字painter.save();painter.drawText(QRectF(textLeft, 0, this->width() - textLeft, this->height()), this->text(), Qt::AlignVCenter | Qt::AlignLeft);painter.restore();
}void AniCheckBox::enterEvent(QEvent *e)
{QCheckBox::enterEvent(e);startAnimation("hover_prog", getHoverProg(), 1);
}void AniCheckBox::leaveEvent(QEvent *e)
{QCheckBox::leaveEvent(e);startAnimation("hover_prog", getHoverProg(), 0);
}bool AniCheckBox::hitButton(const QPoint &) const
{return true;
}void AniCheckBox::checkStateChanged(int state)
{if (state == Qt::Unchecked){startAnimation("check_prog", getCheckProg(), 0, 800, QEasingCurve::OutBounce);}else if (state == Qt::PartiallyChecked){}else if (state == Qt::Checked){startAnimation("check_prog", getCheckProg(), 1, 500, QEasingCurve::OutBack);}
}void AniCheckBox::drawBox(QPainter& painter, QRectF rect)
{painter.setPen(foreColor);painter.setRenderHint(QPainter::Antialiasing, true);// 绘制边缘方框，和悬浮状态有关double radius = 3;radius *= (1 - hoverProg);painter.drawRoundedRect(rect, radius, radius);// 绘制选中状态int state = this->checkState();double prop = 0.6;prop *= checkProg;rect = QRectF(rect.left() + rect.width() * (1 - prop) / 2,rect.top() + rect.height() * (1 - prop) / 2,rect.width() * prop,rect.height() * prop);QPainterPath path;path.addRoundedRect(rect, radius, radius);painter.fillPath(path, foreColor);if (state == Qt::Unchecked){}else if (state == Qt::PartiallyChecked){}else if (state == Qt::Checked){}
}QPropertyAnimation *AniCheckBox::startAnimation(const QByteArray &property, double begin, double end, int duration, QEasingCurve curve)
{QPropertyAnimation* ani = new QPropertyAnimation(this, property);ani->setStartValue(begin);ani->setEndValue(end);ani->setDuration(duration);ani->setEasingCurve(curve);connect(ani, SIGNAL(finished()), ani, SLOT(deleteLater()));connect(ani, SIGNAL(valueChanged(const QVariant&)), this, SLOT(update()));ani->start();return ani;
}double AniCheckBox::getHoverProg() const
{return hoverProg;
}void AniCheckBox::setHoverProg(double prog)
{this->hoverProg = prog;
}double AniCheckBox::getPartProg() const
{return partyProg;
}void AniCheckBox::setPartProg(double prog)
{this->partyProg = prog;
}double AniCheckBox::getCheckProg() const
{return checkProg;
}void AniCheckBox::setCheckProg(double prog)
{this->checkProg = prog;
}

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