Qt 自定义 进度条 纯代码

一 结果图示

Qt 自定义 进度条  纯代码

二 代码

头文件

#ifndef CPROGRESS_H
#define CPROGRESS_H

#include <QWidget>
#include <QPainter>
#include <QDebug>
#include <qmath.h>

class CProgress : public QWidget
{
    Q_OBJECT
public:
    explicit CProgress(QWidget *parent = nullptr);
    void setValue(int value);                       //设置值
    void setRectColor(QColor color);                //设置背景颜色
    void setCursorColor(QColor color);              //设置游标颜色
    void setValueColor(QColor color);               //设置值的背景颜色
    void setRadius(int radius);                     //设置圆角半径

signals:

protected:

    void paintEvent(QPaintEvent *);                 //绘制事件重写
    void drawBigRect(QPainter* painter);            //绘制圆角长方形
    void drawCursor(QPainter* painter);             //绘制游标
    void drawValue(QPainter* painter);              //画值
    void drawDots(QPainter* painter);               //绘制进度条上的圆点

public slots:

private:

    QColor m_bigRectColor;  //背景色
    QColor m_cursorColor;   //游标颜色
    QColor m_valueColor;    //当前进度颜色
    QColor m_dotsColor;     //圆点颜色

    int m_radius = 6;       //圆角半径
    int m_xPadding = 10;    //x方向边距
    int m_yPadding = 20;    //y方向边距
    int m_value = 0;        //当前值:0-100
    int m_dotRadius = 4;      //圆点的半径
};

#endif // CPROGRESS_H
三 cpp文件
#include "cprogress.h"

CProgress::CProgress(QWidget *parent) : QWidget(parent)
{
    m_bigRectColor = QColor(220, 220, 220);
    m_cursorColor = QColor(58, 121, 247);
    m_valueColor = QColor(58, 121, 247);
    m_dotsColor = QColor(58, 121, 247);
}

// 重写绘制事件
void CProgress::paintEvent(QPaintEvent *)
{
    QPainter painter(this);
    painter.setRenderHints(QPainter::Antialiasing | QPainter::TextAntialiasing);//设置给定的渲染提示;

    drawBigRect(&painter);
    drawCursor(&painter);
    drawValue(&painter);
    drawDots(&painter);
}

//画圆角长方形
void CProgress::drawBigRect(QPainter* painter)
{
    QRect rect(m_xPadding, m_yPadding, width() - m_xPadding * 2, height() - m_yPadding * 2);
    painter->save();
    painter->setPen(Qt::NoPen);
    painter->setBrush(m_bigRectColor);
    painter->drawRoundedRect(rect, m_radius, m_radius);
    painter->restore();
}

//画五边形游标
void CProgress::drawCursor(QPainter* painter)
{
    painter->save();
    painter->setPen(Qt::NoPen);
    painter->setBrush(m_cursorColor);

    int x = m_xPadding + (width() - m_xPadding * 2) * m_value / 100;
    int y = height() - m_yPadding;
    int offset = 8;
    QPolygon pts;
    pts.append(QPoint(x, y));
    pts.append(QPoint(x - offset + 2, y + offset));
    pts.append(QPoint(x - offset + 2, y + 2 * offset));
    pts.append(QPoint(x + offset - 2, y + 2 * offset));
    pts.append(QPoint(x + offset - 2, y + offset));
    painter->drawPolygon(pts);//画五边形

    painter->restore();
}

//画值
void CProgress::drawValue(QPainter* painter)
{
    int width = m_value *( this->width() - m_xPadding * 2) / 100;
    QRect rect(m_xPadding, m_yPadding, width, this->height() - m_yPadding * 2);
    painter->save();
    painter->setPen(Qt::NoPen);
    painter->setBrush(m_valueColor);
    painter->drawRoundedRect(rect, m_radius, m_radius);
    painter->restore();
}

//画进度条上面的点
void CProgress::drawDots(QPainter* painter)
{
    int y = 6;
    int x = 10;
    painter->save();
    painter->setPen(Qt::NoPen);
    painter->setBrush(m_dotsColor);
    for(int i = 0; i < 5; i++)
    {
        if(i >= 3)
        {
            painter->setBrush(QColor(255, 0, 0));
        }
        x = 10 +  ((width() - m_xPadding * 2)/4) *i;
        if(i == 4)
        {
            x -= 3;
        }
        painter->drawEllipse(x, y, m_dotRadius *  2, m_dotRadius * 2);
    }

    painter->restore();
}

//设置值
void CProgress::setValue(int value)
{
    m_value = value;
    update();
}

//设置背景颜色
void CProgress::setRectColor(QColor color)
{
    m_bigRectColor = color;
    update();
}

//设置游标颜色
void CProgress::setCursorColor(QColor color)
{
    m_cursorColor = color;
    update();
}

//设置当前进度颜色
void CProgress::setValueColor(QColor color)
{
    m_valueColor = color;
    update();
}

//设置圆角半径
void CProgress::setRadius(int radius)
{
    m_radius = radius;
    update();
}
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