《QT实用小工具·五十一》带动画的 CheckBox

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_OBJECT
    Q_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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