QT 实现固定大小圆形进度条

#ifndef MYCIRPROCESS_H

#define MYCIRPROCESS_H

#include <QtCore>

#include <QtGui>

#include <qwidget.h>

#include <QLabel>

#include <QApplication>

#include <qdesktopwidget.h>

class StorageDisplay : public QWidget

{

    Q_OBJECT

public:

    StorageDisplay(QWidget *parent = 0);

    ~StorageDisplay();

    void setUsedValue(int value);

    //void setSize(int width, int height);

protected:

    void paintEvent(QPaintEvent *event);

 //   void resizeEvent (QResizeEvent * event);

//    void mousePressEvent(QMouseEvent *event);

//    void mouseMoveEvent(QMouseEvent *event);

//    void mouseReleaseEvent(QMouseEvent *event);

//    void showEvent(QShowEvent *event);

//    void hideEvent(QHideEvent *event);

private slots:

 //   void slotUpdateTimer();

private:

    QPoint beginDrag;

    bool bPressFlag;

    QPixmap backGround;

    int userdVaule;

    int currentValue;

    QLabel *startValueLabel;

    QLabel *endValueLabel;

    QLabel *dispayValueLabel;

 //   QTimer *updateTimer;

};

#endif // MYCIRPROCESS_H

#include "storagedisplay.h"

StorageDisplay::StorageDisplay(QWidget *parent)

    : QWidget(parent, Qt::FramelessWindowHint)

    , bPressFlag(false)

    , currentValue(0)

{

    //resize(300, 300);

    setAutoFillBackground(false);

    QPalette pal = palette();

    pal.setColor(QPalette::Background, QColor(0xFF,0xFF,0xFF,0xFF));

    setPalette(pal);

//    startValueLabel = new QLabel(tr("0%"), this);

//    startValueLabel->setFont(QFont("Arial", 11, QFont::Normal));

//    startValueLabel->setStyleSheet("color:#898989");

//    endValueLabel = new QLabel(tr("100%"),this);

//    endValueLabel->setFont(QFont("Arial", 11, QFont::Normal));

//    endValueLabel->setStyleSheet("color:#898989");

    dispayValueLabel = new QLabel(this);

    dispayValueLabel->setStyleSheet("color:#349BDA");

//    updateTimer = new QTimer(this);

//    updateTimer->setInterval(20);

//    connect(updateTimer, SIGNAL(timeout()), this, SLOT(slotUpdateTimer()));

}

StorageDisplay::~StorageDisplay()

{

//    if (updateTimer->isActive()) {

//        updateTimer->stop();

//    }

    currentValue = 0;

}

void StorageDisplay::setUsedValue(int value)

{

    if(value >= 100)

    {

        currentValue = 100;

    }

    else

    {

        currentValue = value;

    }

    update();

}

//void StorageDisplay::showEvent(QShowEvent *event)

//{

//    updateTimer->start();

//    currentValue = 0;

//}

//void StorageDisplay::hideEvent(QHideEvent *event)

//{

//    if (updateTimer->isActive()) {

//        updateTimer->stop();

//    }

//    currentValue = 0;

//}

//void StorageDisplay::slotUpdateTimer()

//{

//    if (currentValue >= userdVaule) {

//        updateTimer->stop();

//        return;

//    }

//    currentValue++;

//    update();

//}

void StorageDisplay::paintEvent(QPaintEvent *event)

{

    QPainter painter(this);

    QColor usedColor(165, 220, 62);

    QColor freeColor(215, 215, 215);

    painter.drawPixmap(QRect((width() - backGround.width())/2 , (height() - backGround.height())/2, backGround.width(), backGround.height()) , backGround);

    painter.translate(width() / 2, height() / 2);

    painter.setRenderHint(QPainter::Antialiasing);

    painter.setRenderHint(QPainter::SmoothPixmapTransform);

    painter.save();

    painter.rotate(42);

    painter.setPen(QPen(usedColor, 2));

    for (int i = 0; i < currentValue ; ++i) {

        painter.drawLine(0, 70, 0, 80);

        painter.rotate(2.8);

    }

    painter.setPen(QPen(freeColor, 3));

    for (int i = currentValue; i < 100 ; ++i) {

        painter.drawLine(0, 70, 0, 80);

        painter.rotate(2.8);

    }

    if (currentValue == 0) {

        dispayValueLabel->setFont(QFont("Arial", 12, QFont::Bold));

        dispayValueLabel->setText(tr("0%"));

    }

    else {

        dispayValueLabel->setFont(QFont("Arial", 15, QFont::Bold));

        dispayValueLabel->setText(tr("%1%").arg(currentValue));

    }

    QFontMetrics metrics(dispayValueLabel->font());

    int textwidth = metrics.width(dispayValueLabel->text());

    int textheight = metrics.height();

    dispayValueLabel->setGeometry((width() - textwidth)/2, (height() - textheight)/2 , textwidth, textheight);

    painter.restore();

    painter.translate(-width()/2, -height()/2);

    painter.setBrush(QColor(233, 233, 233));

    painter.setPen(QPen(QColor(233, 233, 233), 15));

    painter.drawEllipse(QRectF((width()/2 - 55), (height()/2 - 55), 110, 110));

    QConicalGradient conicalGradient(width()/2, height()/2, 90);

    conicalGradient.setColorAt(0, QColor(45, 204, 112));

    conicalGradient.setColorAt(1.0, QColor(51, 152, 219));

    painter.setPen(QPen(QBrush(conicalGradient), 30));

    painter.drawEllipse(QRectF((width()/2 - 35), (height()/2 - 35), 70, 70));

    painter.setPen(Qt::NoPen);

    painter.setBrush(QColor(249, 249, 249));

    painter.drawEllipse(QRectF((width()/2 - 30), (height()/2 - 30), 60, 60));

}

//void StorageDisplay::resizeEvent(QResizeEvent *event)

//{

//    move((QApplication::desktop()->width() - width())/2,  (QApplication::desktop()->height() - height())/2);

//    startValueLabel->setGeometry(35, 140, 25, 20);

//    endValueLabel->setGeometry(97, 140, 50, 20);

//}

/****************move everywhere*******************/

//void StorageDisplay::mousePressEvent(QMouseEvent *event)

//{

//    bPressFlag = true;

//    beginDrag = event->pos();

//    QWidget::mousePressEvent(event);

//}

//void StorageDisplay::mouseMoveEvent(QMouseEvent *event)

//{

//    if (bPressFlag) {

//        QPoint relaPos(QCursor::pos() - beginDrag);

//        move(relaPos);

//    }

//    QWidget::mouseMoveEvent(event);

//}

//void StorageDisplay::mouseReleaseEvent(QMouseEvent *event)

//{

//    bPressFlag = false;

//    QWidget::mouseReleaseEvent(event);

//}