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：
- 可设置边框颜色/周末颜色/角标颜色/农历节日颜色
- 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
- 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
- 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
- 可设置三种选中背景模式,矩形背景 圆形背景 图片背景
- 可直接切换到上一年/下一年/上一月/下一月/转到今天
- 可设置是否显示农历信息,不显示则当做正常的日历使用
- 支持1900年-2099年范围
- 很方便改成多选日期
二、代码思路
代码语言：txt复制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();
}三、效果图
lunarcalendarwidget.gif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。
- 国内站点：https://gitee.com/feiyangqingyun/QWidgetDemo
- 国际站点：https://github.com/feiyangqingyun/QWidgetDemo
- 个人主页：https://blog.csdn.net/feiyangqingyun
- 知乎主页：https://www.zhihu.com/people/feiyangqingyun/
