Qt编写自定义控件17-按钮进度条

#ifndef PROGRESSBUTTON_H
#define PROGRESSBUTTON_H

/**
 * 按钮进度条控件 作者:倪大侠(QQ:393320854 zyb920@hotmail.com) 2019-4-17
 * 1:可设置进度线条宽度+颜色
 * 2:可设置边框宽度+颜色
 * 3:可设置圆角角度+背景颜色
 */

#include <QWidget>

class QTimer;

#ifdef quc
#if (QT_VERSION < QT_VERSION_CHECK(5,7,0))
#include <QtDesigner/QDesignerExportWidget>
#else
#include <QtUiPlugin/QDesignerExportWidget>
#endif

class QDESIGNER_WIDGET_EXPORT ProgressButton : public QWidget
#else
class ProgressButton : public QWidget
#endif

{
    Q_OBJECT
    Q_PROPERTY(int lineWidth READ getLineWidth WRITE setLineWidth)
    Q_PROPERTY(QColor lineColor READ getLineColor WRITE setLineColor)
    Q_PROPERTY(int borderWidth READ getBorderWidth WRITE setBorderWidth)
    Q_PROPERTY(QColor borderColor READ getBorderColor WRITE setBorderColor)
    Q_PROPERTY(int borderRadius READ getBorderRadius WRITE setBorderRadius)
    Q_PROPERTY(QColor bgColor READ getBgColor WRITE setBgColor)

public:
    explicit ProgressButton(QWidget *parent = 0);

protected:
    void resizeEvent(QResizeEvent *);
    void mousePressEvent(QMouseEvent *);
    void paintEvent(QPaintEvent *);
    void drawBg(QPainter *painter);
    void drawProgress(QPainter *painter);

private:
    int lineWidth;          //线条宽度
    QColor lineColor;       //线条颜色
    int borderWidth;        //边框宽度
    QColor borderColor;     //边框颜色
    int borderRadius;       //圆角角度
    QColor bgColor;         //背景颜色

    double value;           //当前值
    int status;             //状态
    int tempWidth;          //动态改变宽度
    QTimer *timer;          //定时器改变进度

public:
    int getLineWidth()      const;
    QColor getLineColor()   const;
    int getBorderWidth()    const;
    QColor getBorderColor() const;
    int getBorderRadius()   const;
    QColor getBgColor()     const;

    QSize sizeHint()        const;
    QSize minimumSizeHint() const;

private slots:
    void progress();

public Q_SLOTS:
    //设置线条宽度+颜色
    void setLineWidth(int lineWidth);
    void setLineColor(const QColor &lineColor);

    //设置边框宽度+颜色
    void setBorderWidth(int borderWidth);
    void setBorderColor(const QColor &borderColor);

    //设置圆角角度+背景颜色
    void setBorderRadius(int borderRadius);
    void setBgColor(const QColor &bgColor);

Q_SIGNALS:
    void valueChanged(int value);
};

#endif // PROGRESSBUTTON_H

void ProgressButton::paintEvent(QPaintEvent *)
{
    QPainter painter(this);
    painter.setRenderHints(QPainter::Antialiasing | QPainter::TextAntialiasing);

    if (1 == status) {
        //绘制当前进度
        drawProgress(&painter);
    } else {
        //绘制按钮背景
        drawBg(&painter);
    }
}

void ProgressButton::drawBg(QPainter *painter)
{
    painter->save();

    int width = this->width();
    int height = this->height();
    int side = qMin(width, height);

    QPen pen;
    pen.setWidth(borderWidth);
    pen.setColor(borderColor);
    painter->setPen(borderWidth > 0 ? pen : Qt::NoPen);
    painter->setBrush(bgColor);

    QRect rect(((width - tempWidth) / 2) + borderWidth, borderWidth, tempWidth - (borderWidth * 2), height - (borderWidth * 2));
    painter->drawRoundedRect(rect, borderRadius, borderRadius);

    QFont font;
    font.setPixelSize(side - 18);
    painter->setFont(font);
    painter->setPen(lineColor);
    painter->drawText(rect, Qt::AlignCenter, status == 2 ? "完 成" : "开 始");

    painter->restore();
}

void ProgressButton::drawProgress(QPainter *painter)
{
    painter->save();

    int width = this->width();
    int height = this->height();
    int side = qMin(width, height);
    int radius = 99 - borderWidth;

    //绘制外圆
    QPen pen;
    pen.setWidth(borderWidth);
    pen.setColor(borderColor);
    painter->setPen(borderWidth > 0 ? pen : Qt::NoPen);
    painter->setBrush(bgColor);

    //平移坐标轴中心,等比例缩放
    QRect rectCircle(-radius, -radius, radius * 2, radius * 2);
    painter->translate(width / 2, height / 2);
    painter->scale(side / 200.0, side / 200.0);
    painter->drawEllipse(rectCircle);

    //绘制圆弧进度
    pen.setWidth(lineWidth);
    pen.setColor(lineColor);
    painter->setPen(pen);

    int offset = radius - lineWidth - 5;
    QRectF rectArc(-offset, -offset, offset * 2, offset * 2);
    int startAngle = offset * 16;
    int spanAngle = -value * 16;
    painter->drawArc(rectArc, startAngle, spanAngle);

    //绘制进度文字
    QFont font;
    font.setPixelSize(offset - 15);
    painter->setFont(font);
    QString strValue = QString("%1%").arg((int)value  * 100 / 360);
    painter->drawText(rectCircle, Qt::AlignCenter, strValue);

    painter->restore();
}

void ProgressButton::progress()
{
    if (0 == status) {
        tempWidth -= 5;
        if (tempWidth < this->height() / 2) {
            tempWidth = this->height() / 2;
            status = 1;
        }
    } else if (1 == status) {
        value += 1.0;
        if (value >= 360) {
            value = 360.0;
            status = 2;
        }
    } else if (2 == status) {
        tempWidth += 5;
        if (tempWidth > this->width()) {
            tempWidth = this->width();
            timer->stop();
        }
    }

    this->update();
}