/*! Paints the week scale header.
 * \sa paintHeader()
 */
void DateTimeGrid::paintWeekScaleHeader( QPainter* painter,  const QRectF& headerRect, const QRectF& exposedRect,
                                        qreal offset, QWidget* widget )
{
    QStyle* style = widget?widget->style():QApplication::style();

    // Paint a section for each week
    QDateTime sdt = d->chartXtoDateTime( offset+exposedRect.left() );
    sdt.setTime( QTime( 0, 0, 0, 0 ) );
    // Go backwards until start of week
    while ( sdt.date().dayOfWeek() != d->weekStart ) sdt = sdt.addDays( -1 );
    QDateTime dt = sdt;
    for ( qreal x = d->dateTimeToChartX( dt ); x < exposedRect.right()+offset;
            dt = dt.addDays( 7 ),x=d->dateTimeToChartX( dt ) ) {
        QStyleOptionHeader opt;
        opt.init( widget );
        opt.rect = QRectF( x-offset, headerRect.top()+headerRect.height()/2., dayWidth()*7, headerRect.height()/2. ).toRect();
        opt.text = QString::number( dt.date().weekNumber() );
        opt.textAlignment = Qt::AlignCenter;
        // NOTE:CE_Header does not honor clipRegion(), so we do the CE_Header logic here
        style->drawControl( QStyle::CE_HeaderSection, &opt, painter, widget );
        QStyleOptionHeader subopt = opt;
        subopt.rect = style->subElementRect( QStyle::SE_HeaderLabel, &opt, widget );
        if ( subopt.rect.isValid() ) {
            style->drawControl( QStyle::CE_HeaderLabel, &subopt, painter, widget );
        }
    }

    // Paint a section for each month
    dt = sdt;
    for ( qreal x2 = d->dateTimeToChartX( dt ); x2 < exposedRect.right()+offset; x2=d->dateTimeToChartX( dt ) ) {
        //qDebug()<<"paintWeekScaleHeader()"<<dt;
        QDate next = dt.date().addMonths( 1 );
        next = next.addDays( 1 - next.day() );

        QStyleOptionHeader opt;
        opt.init( widget );
        opt.rect = QRectF( x2-offset, headerRect.top(), dayWidth()*dt.date().daysTo( next ), headerRect.height()/2. ).toRect();
        opt.text = QDate::longMonthName( dt.date().month() );
        opt.textAlignment = Qt::AlignCenter;
        // NOTE:CE_Header does not honor clipRegion(), so we do the CE_Header logic here
        style->drawControl( QStyle::CE_HeaderSection, &opt, painter, widget );
        QStyleOptionHeader subopt = opt;
        subopt.rect = style->subElementRect( QStyle::SE_HeaderLabel, &opt, widget );
        if ( subopt.rect.isValid() ) {
            style->drawControl( QStyle::CE_HeaderLabel, &subopt, painter, widget );
        }

        dt.setDate( next );
    }
}
/*! Paints the day scale header.
 * \sa paintHeader()
 */
void DateTimeGrid::paintDayScaleHeader( QPainter* painter,  const QRectF& headerRect, const QRectF& exposedRect,
                                qreal offset, QWidget* widget )
{
    // For starters, support only the regular tab-per-day look
    QStyle* style = widget?widget->style():QApplication::style();

    // Paint a section for each day
    QDateTime dt = d->chartXtoDateTime( offset+exposedRect.left() );
    dt.setTime( QTime( 0, 0, 0, 0 ) );
    for ( qreal x = d->dateTimeToChartX( dt ); x < exposedRect.right()+offset;
          dt = dt.addDays( 1 ),x=d->dateTimeToChartX( dt ) ) {
        QStyleOptionHeader opt;
        opt.init( widget );
        opt.rect = QRectF( x-offset, headerRect.top()+headerRect.height()/2., dayWidth(), headerRect.height()/2. ).toRect();
        opt.text = dt.toString( QString::fromAscii( "ddd" ) ).left( 1 );
        opt.textAlignment = Qt::AlignCenter;
        // NOTE:CE_Header does not honor clipRegion(), so we do the CE_Header logic here
        style->drawControl( QStyle::CE_HeaderSection, &opt, painter, widget );
        QStyleOptionHeader subopt = opt;
        subopt.rect = style->subElementRect( QStyle::SE_HeaderLabel, &opt, widget );
        if ( subopt.rect.isValid() ) {
            style->drawControl( QStyle::CE_HeaderLabel, &subopt, painter, widget );
        }
    }

    dt = d->chartXtoDateTime( offset+exposedRect.left() );
    dt.setTime( QTime( 0, 0, 0, 0 ) );
    // Go backwards until start of week
    while ( dt.date().dayOfWeek() != d->weekStart ) dt = dt.addDays( -1 );
    // Paint a section for each week
    for ( qreal x2 = d->dateTimeToChartX( dt ); x2 < exposedRect.right()+offset;
          dt = dt.addDays( 7 ),x2=d->dateTimeToChartX( dt ) ) {
        QStyleOptionHeader opt;
        opt.init( widget );
        opt.rect = QRectF( x2-offset, headerRect.top(), dayWidth()*7., headerRect.height()/2. ).toRect();
        opt.text = QString::number( dt.date().weekNumber() );
        opt.textAlignment = Qt::AlignCenter;
        // NOTE:CE_Header does not honor clipRegion(), so we do the CE_Header logic here
        style->drawControl( QStyle::CE_HeaderSection, &opt, painter, widget );
        QStyleOptionHeader subopt = opt;
        subopt.rect = style->subElementRect( QStyle::SE_HeaderLabel, &opt, widget );
        if ( subopt.rect.isValid() ) {
            style->drawControl( QStyle::CE_HeaderLabel, &subopt, painter, widget );
        }
    }
}
/*! Paints the hour scale header.
 * \sa paintHeader()
 */
void DateTimeGrid::paintHourScaleHeader( QPainter* painter,  const QRectF& headerRect, const QRectF& exposedRect,
                                qreal offset, QWidget* widget )
{
    QStyle* style = widget?widget->style():QApplication::style();

    // Paint a section for each hour
    QDateTime dt = d->chartXtoDateTime( offset+exposedRect.left() );
    dt.setTime( QTime( dt.time().hour(), 0, 0, 0 ) );
    for ( qreal x = d->dateTimeToChartX( dt ); x < exposedRect.right()+offset;
          dt = dt.addSecs( 60*60 /*1 hour*/ ),x=d->dateTimeToChartX( dt ) ) {
        QStyleOptionHeader opt;
        opt.init( widget );
        opt.rect = QRectF( x-offset, headerRect.top()+headerRect.height()/2., dayWidth()/24., headerRect.height()/2. ).toRect();
        opt.text = dt.time().toString( QString::fromAscii( "hh" ) );
        opt.textAlignment = Qt::AlignCenter;
        // NOTE:CE_Header does not honor clipRegion(), so we do the CE_Header logic here
        style->drawControl( QStyle::CE_HeaderSection, &opt, painter, widget );
        QStyleOptionHeader subopt = opt;
        subopt.rect = style->subElementRect( QStyle::SE_HeaderLabel, &opt, widget );
        if ( subopt.rect.isValid() ) {
            style->drawControl( QStyle::CE_HeaderLabel, &subopt, painter, widget );
        }
    }

    dt = d->chartXtoDateTime( offset+exposedRect.left() );
    dt.setTime( QTime( 0, 0, 0, 0 ) );
    // Paint a section for each day
    for ( qreal x2 = d->dateTimeToChartX( dt ); x2 < exposedRect.right()+offset;
          dt = dt.addDays( 1 ),x2=d->dateTimeToChartX( dt ) ) {
        QStyleOptionHeader opt;
        opt.init( widget );
        opt.rect = QRectF( x2-offset, headerRect.top(), dayWidth(), headerRect.height()/2. ).toRect();
        opt.text = QDate::longDayName( dt.date().dayOfWeek() );
        opt.textAlignment = Qt::AlignCenter;
        // NOTE:CE_Header does not honor clipRegion(), so we do the CE_Header logic here
        style->drawControl( QStyle::CE_HeaderSection, &opt, painter, widget );
        QStyleOptionHeader subopt = opt;
        subopt.rect = style->subElementRect( QStyle::SE_HeaderLabel, &opt, widget );
        if ( subopt.rect.isValid() ) {
            style->drawControl( QStyle::CE_HeaderLabel, &subopt, painter, widget );
        }
    }
}
///
/// \brief 绘制左上角按钮
/// \param painter 设置好绘制设备的painter
/// \param btn 左上角按钮,左上角按钮指针,Painter已经把此按钮设置为此绘制设备
///
void DTableWidgetEx::paintConnerButton(QStylePainter &painter,QAbstractButton* btn)
{
    QStyleOptionHeader opt;
    opt.init(btn);
    QStyle::State state = QStyle::State_None;
    if (btn->isEnabled())
        state |= QStyle::State_Enabled;
    if (btn->isActiveWindow())
        state |= QStyle::State_Active;
    if (btn->isDown())
        state |= QStyle::State_Sunken;
    opt.state = state;
    opt.rect = btn->rect();
    opt.text = btn->text(); // this line is the only difference to QTableCornerButton

    opt.position = QStyleOptionHeader::OnlyOneSection;
    painter.drawControl(QStyle::CE_Header, opt);
}