27.QT-QProgressBar动态实现多彩进度条(详解)

如下图所示:

27.QT-QProgressBar动态实现多彩进度条(详解)_第1张图片

效果如下:

27.QT-QProgressBar动态实现多彩进度条(详解)_第2张图片

(gif录制的动画效果不好,所以颜色有间隙)

 

介绍

通过qss实现,只需要一个多彩背景图,通过QImage获取颜色,然后来设置进度条,便可以实现动态多彩进度条(根据图片设定颜色)

其中,上面3个进度条就是通过以下3个图片实现的:

27.QT-QProgressBar动态实现多彩进度条(详解)_第3张图片

如果想实现其它颜色,只需要改图片即可

 

代码如下

ProgressBar.h:

#ifndef PROGRESSBAR_H
#define PROGRESSBAR_H
#include 

class ProgressBar : public QWidget
{
    Q_OBJECT

    QProgressBar m_bar;
    QLabel       m_value;
    QSlider      m_slider;
    QImage       m_image;

protected slots:
    void  onvalueChanged(int value);
public:
    explicit ProgressBar(const QString&  fileName,QWidget *parent = 0);  
};

#endif // PROGRESSBAR_H

ProgressBar.cpp:

#include "ProgressBar.h"

ProgressBar:: ProgressBar(const QString&  fileName,QWidget *parent ) :
    QWidget(parent),
    m_bar(this),
    m_value(this),
    m_slider(this),
    m_image(fileName)
{

    m_bar.setMaximum(100);
    m_bar.setMinimum(0);
    m_bar.setValue(0);
    m_bar.setTextVisible(false);
    m_bar.setFixedHeight(20);

    m_slider.setMaximum(100);
    m_slider.setMinimum(0);
    m_slider.setValue(0);
    m_slider.setOrientation(Qt::Horizontal);

    m_value.setText(QString("%1%").arg(m_bar.value()));
    m_value.setAlignment(Qt::AlignRight|Qt::AlignVCenter);
    m_value.setMinimumWidth(40);
/*设置布局*/ QHBoxLayout* hlayout = new QHBoxLayout(); hlayout->addWidget(&m_slider); hlayout->addWidget(&m_value,0,Qt::AlignRight); QVBoxLayout* vlayout = new QVBoxLayout(); vlayout->addWidget(&m_bar); vlayout->addLayout(hlayout); setLayout(vlayout); connect(&m_slider,SIGNAL(valueChanged ( int)),&m_bar,SLOT(setValue (int))); connect(&m_bar,SIGNAL(valueChanged ( int)),this,SLOT(onvalueChanged (int))); onvalueChanged(m_bar.value()); } void ProgressBar::onvalueChanged(int value) { QString qss= "QProgressBar{" "border: 1px solid rgb(16, 135, 209);" "background: rgba(248,248,255,180);" "border-radius: 6px; }" "QProgressBar::chunk:enabled {" "border-radius: 4px; " "background: qlineargradient(x1:0, y1:0, x2:1, y2:0" ; double v = m_bar.maximum(); double EndColor=static_cast<double>(value)/v ; //获取比例 for(int i=0;i<100;i++) { double Current = EndColor*i/100; QRgb rgb = m_image.pixel((m_image.width()-1)*Current,m_image.height()/2); QColor c(rgb); qss.append(QString(",stop:%1 rgb(%2,%3,%4)").arg(i/100.0).arg(c.red()).arg(c.green()).arg(c.blue())); } qss.append(");}"); m_bar.setStyleSheet(qss); m_value.setText(QString("%1%").arg(m_bar.value())); }

 

 

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