## 一、前言

农历控件在国产linux中必备的控件之一，毕竟要适应国人的习惯，你看win10系统的日历，现在点开来直接就有农历在上面，非常方便人性化，所以在很多用Qt做的项目中，也有农历控件的应用场景，而Qt自带的日历控件比较简单，仔细看过源码的人也只知道，其实就是一堆微调框，下拉框，表格组成的，于是打算借用此方法造一个农历控件，本控件的算法是倪大侠提供的，个人测试下来还是没有问题的，造这个农历控件最大的难点是如何根据日期计算农历时间，再加上一些农历的节气之类的，这个网上估计也有很多的算法参考。

**主要功能：**

1. 可设置边框颜色/周末颜色/角标颜色/农历节日颜色

2. 可设置当前月文字颜色/其他月文字颜色/选中日期文字颜色/悬停日期文字颜色

3. 可设置当前月农历文字颜色/其他月农历文字颜色/选中日期农历文字颜色/悬停日期农历文字颜色

4. 可设置当前月背景颜色/其他月背景颜色/选中日期背景颜色/悬停日期背景颜色

5. 可设置三种选中背景模式,矩形背景+圆形背景+图片背景

6. 可直接切换到上一年/下一年/上一月/下一月/转到今天

7. 可设置是否显示农历信息,不显示则当做正常的日历使用

8. 支持1900年-2099年范围

9. 很方便改成多选日期

## 二、代码思路

void LunarCalendarItem::paintEvent(QPaintEvent *){    //绘制准备工作,启用反锯齿    QPainter painter(this);    painter.setRenderHints(QPainter::Antialiasing | QPainter::TextAntialiasing);    //绘制背景和边框    drawBg(&painter);    //优先绘制选中状态,其次绘制悬停状态    if (select) {        drawBgCurrent(&painter, selectBgColor);    } else if (hover) {        drawBgCurrent(&painter, hoverBgColor);    }    //绘制日期    drawDay(&painter);    //绘制农历信息    drawLunar(&painter);}void LunarCalendarItem::drawBg(QPainter *painter){    painter->save();    //根据当前类型选择对应的颜色    QColor bgColor = currentBgColor;    if (dayType == DayType_MonthPre || dayType == DayType_MonthNext) {        bgColor = otherBgColor;    }    painter->setPen(borderColor);    painter->setBrush(bgColor);    painter->drawRect(rect());    painter->restore();}void LunarCalendarItem::drawBgCurrent(QPainter *painter, const QColor &color){    int width = this->width();    int height = this->height();    int side = qMin(width, height);    painter->save();    painter->setPen(Qt::NoPen);    painter->setBrush(color);    //根据设定绘制背景样式    if (selectType == SelectType_Rect) {        painter->drawRect(rect());    } else if (selectType == SelectType_Circle) {        int radius = side / 2 - 3;        painter->drawEllipse(QPointF(width / 2, height / 2), radius, radius);    } else if (selectType == SelectType_Triangle) {        int radius = side / 3;        QPolygon pts;        pts.setPoints(3, 1, 1, radius, 1, 1, radius);        painter->drawRect(rect());        painter->setBrush(superColor);        painter->drawConvexPolygon(pts);    } else if (selectType == SelectType_Image) {        //等比例缩放居中绘制        QImage img(bgImage);        if (!img.isNull()) {            img = img.scaled(this->size(), Qt::KeepAspectRatio, Qt::SmoothTransformation);            int x = (width - img.width()) / 2;            int y = (height - img.height()) / 2;            painter->drawImage(x, y, img);        }    }    painter->restore();}void LunarCalendarItem::drawDay(QPainter *painter){    int width = this->width();    int height = this->height();    int side = qMin(width, height);    painter->save();    //根据当前类型选择对应的颜色    QColor color = currentTextColor;    if (dayType == DayType_MonthPre || dayType == DayType_MonthNext) {        color = otherTextColor;    } else if (dayType == DayType_WeekEnd) {        color = weekColor;    }    if (select) {        color = selectTextColor;    } else if (hover) {        color = hoverTextColor;    }    painter->setPen(color);    if (showLunar) {        QFont font;        font.setPixelSize(side / 2.7);        painter->setFont(font);        QRect dayRect = QRect(0, 0, width, height / 1.7);        painter->drawText(dayRect, Qt::AlignHCenter | Qt::AlignBottom, QString::number(date.day()));    } else {        QFont font;        font.setPixelSize(side / 2);        painter->setFont(font);        QRect dayRect = QRect(0, 0, width, height);        painter->drawText(dayRect, Qt::AlignCenter, QString::number(date.day()));    }    painter->restore();}void LunarCalendarItem::drawLunar(QPainter *painter){    if (!showLunar) {        return;    }    int width = this->width();    int height = this->height();    int side = qMin(width, height);    painter->save();    //判断当前农历文字是否节日,是节日且是当月则用农历节日颜色显示    bool exist = (!listDayName.contains(lunar) && dayType != DayType_MonthPre && dayType != DayType_MonthNext);    //根据当前类型选择对应的颜色    QColor color = currentLunarColor;    if (dayType == DayType_MonthPre || dayType == DayType_MonthNext) {        color = otherLunarColor;    }    if (select) {        color = selectTextColor;    } else if (hover) {        color = hoverTextColor;    } else if (exist) {        color = lunarColor;    }    painter->setPen(color);    QFont font;    font.setPixelSize(side / 5);    painter->setFont(font);        QRect lunarRect(0, height / 2, width, height / 2);    painter->drawText(lunarRect, Qt::AlignCenter, lunar);    painter->restore();}

## 四、开源主页

**以上作品完整源码下载都在开源主页，会持续不断更新作品数量和质量，欢迎各位关注。**

1. 国内站点：[]()

2. 国际站点：[]()

3. 个人主页：[]()

4. 知乎主页：[]()