Qt编写自定义控件59-直方动态图

#ifndef WAVEBAR_H
#define WAVEBAR_H

/**
 * 直方动态图控件 作者:feiyangqingyun(QQ:517216493) 2016-11-6
 * 1:可设置最大值/最小值/当前值
 * 2:可设置顶部滑块高度
 * 3:可设置每次变动的步长
 * 4:可设置item之间的间隔
 * 5:可设置渐变的背景颜色
 * 6:可设置柱状条颜色
 */

#include <QWidget>

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

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

{
    Q_OBJECT    
    Q_PROPERTY(int minValue READ getMinValue WRITE setMinValue)
    Q_PROPERTY(int maxValue READ getMaxValue WRITE setMaxValue)
    Q_PROPERTY(int value READ getValue WRITE setValue)

    Q_PROPERTY(double step READ getStep WRITE setStep)
    Q_PROPERTY(int space READ getSpace WRITE setSpace)
    Q_PROPERTY(int headHeight READ getHeadHeight WRITE setHeadHeight)

    Q_PROPERTY(QColor bgColorStart READ getBgColorStart WRITE setBgColorStart)
    Q_PROPERTY(QColor bgColorEnd READ getBgColorEnd WRITE setBgColorEnd)
    Q_PROPERTY(QColor barColor READ getBarColor WRITE setBarColor)

public:
    explicit WaveBar(QWidget *parent = 0);
    ~WaveBar();

protected:
    void resizeEvent(QResizeEvent *);
    void paintEvent(QPaintEvent *);
    void drawBg(QPainter *painter);
    void drawBar(QPainter *painter);
    void drawHead(QPainter *painter);

private:    
    int minValue;                   //最小值
    int maxValue;                   //最大值
    int value;                      //目标值

    double step;                    //步长
    int space;                      //间距
    int headHeight;                 //顶部条块高度

    QColor bgColorStart;            //背景渐变开始颜色
    QColor bgColorEnd;              //背景渐变结束颜色
    QColor barColor;                //柱状条颜色

    int currentValue;               //当前值
    double headY;                   //顶部条块Y轴坐标
    double barY;                    //柱状条块Y轴坐标
    QTimer *barTimer;               //柱状条块下降定时器
    QTimer *headTimer;              //顶部条块下坠定时器

private slots:
    void updateBar();
    void updateHead();

public:    
    int getMinValue()               const;
    int getMaxValue()               const;
    int getValue()                  const;

    double getStep()                const;
    int getSpace()                  const;
    int getHeadHeight()             const;

    QColor getBgColorStart()        const;
    QColor getBgColorEnd()          const;
    QColor getBarColor()            const;

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

public Q_SLOTS:
    //设置范围值
    void setRange(int minValue, int maxValue);

    //设置最大最小值
    void setMinValue(int minValue);
    void setMaxValue(int maxValue);

    //设置目标值
    void setValue(int value);

    //设置步长
    void setStep(double step);
    //设置间距
    void setSpace(int space);
    //设置顶部条块高度
    void setHeadHeight(int headHeight);

    //设置背景颜色
    void setBgColorStart(const QColor &bgColorStart);
    void setBgColorEnd(const QColor &bgColorEnd);

    //设置柱状条颜色
    void setBarColor(const QColor &barColor);
};

#endif // WAVEBAR_H

void WaveBar::paintEvent(QPaintEvent *)
{
    //绘制准备工作,启用反锯齿
    QPainter painter(this);
    painter.setRenderHints(QPainter::Antialiasing | QPainter::TextAntialiasing);

    //绘制渐变背景
    drawBg(&painter);
    //绘制柱状条块
    drawBar(&painter);
    //绘制顶部条块
    drawHead(&painter);
}

void WaveBar::drawBg(QPainter *painter)
{
    painter->save();
    painter->setPen(Qt::NoPen);
    QLinearGradient bgGradient(QPointF(0, 0), QPointF(0, height()));
    bgGradient.setColorAt(0.0, bgColorStart);
    bgGradient.setColorAt(1.0, bgColorEnd);
    painter->setBrush(bgGradient);
    painter->drawRect(rect());
    painter->restore();
}

void WaveBar::drawBar(QPainter *painter)
{
    painter->save();
    QRectF barRect(QPointF(space, barY), QPointF(width() - space, height() - space));
    painter->setPen(Qt::NoPen);
    painter->setBrush(barColor);
    painter->drawRect(barRect);
    painter->restore();
}

void WaveBar::drawHead(QPainter *painter)
{
    painter->save();
    QRectF headRect(QPointF(space, headY), QPointF(width() - space, headY - headHeight));
    painter->setPen(Qt::NoPen);
    painter->setBrush(barColor);
    painter->drawRect(headRect);
    painter->restore();
}

void WaveBar::updateBar()
{
    barY += step;

    //超过底部则停止
    int bottomY = height() - space - headHeight;

    if (barY >= bottomY) {
        if (barTimer->isActive()) {
            barTimer->stop();
        }

        barY = bottomY;
    }

    this->update();
}

void WaveBar::updateHead()
{
    headY += step;

    //超过底部则停止
    int bottomY = height() - space;

    if (headY >= bottomY) {
        if (headTimer->isActive()) {
            headTimer->stop();
        }

        headY = bottomY;
    }

    this->update();
}