C++ QRectF::top方法代码示例

/*! Paints the gantt item \a idx using \a painter and \a opt
 */
void ItemDelegate::paintGanttItem( QPainter* painter,
                                   const StyleOptionGanttItem& opt,
                                   const QModelIndex& idx )
{
    if ( !idx.isValid() ) return;
    const ItemType typ = static_cast<ItemType>( idx.model()->data( idx, ItemTypeRole ).toInt() );
    const QString& txt = opt.text;
    QRectF itemRect = opt.itemRect;
    QRectF boundingRect = opt.boundingRect;
    boundingRect.setY( itemRect.y() );
    boundingRect.setHeight( itemRect.height() );
    //qDebug() << "itemRect="<<itemRect<<", boundingRect="<<boundingRect;

    painter->save();

    QPen pen = defaultPen( typ );
    if ( opt.state & QStyle::State_Selected ) pen.setWidth( 2*pen.width() );
    painter->setPen( pen );
    painter->setBrush( defaultBrush( typ ) );

    qreal pw = painter->pen().width()/2.;
    switch( typ ) {
    case TypeTask:
        if ( itemRect.isValid() ) {
            // TODO
            qreal pw = painter->pen().width()/2.;
            pw-=1;
            QRectF r = itemRect;
            r.translate( 0., r.height()/6. );
            r.setHeight( 2.*r.height()/3. );
            painter->setBrushOrigin( itemRect.topLeft() );
            painter->save();
            painter->translate( 0.5, 0.5 );
            painter->drawRect( r );
            bool ok;
            qreal completion = idx.model()->data( idx, KDGantt::TaskCompletionRole ).toDouble( &ok );
            if ( ok ) {
                qreal h = r.height();
                QRectF cr( r.x(), r.y()+h/4. + 1,
                           r.width()*completion/100., h/2. - 2 );
                painter->fillRect( cr, painter->pen().brush() );
            }
            painter->restore();
            Qt::Alignment ta;
            switch( opt.displayPosition ) {
            case StyleOptionGanttItem::Left: ta = Qt::AlignLeft; break;
            case StyleOptionGanttItem::Right: ta = Qt::AlignRight; break;
            case StyleOptionGanttItem::Center: ta = Qt::AlignCenter; break;
            }
            painter->drawText( boundingRect, ta, txt );
        }
        break;
    case TypeSummary:
        if ( opt.itemRect.isValid() ) {
            // TODO
            pw-=1;
            const QRectF r = QRectF( opt.itemRect ).adjusted( -pw, -pw, pw, pw );
            QPainterPath path;
            const qreal deltaY = r.height()/2.;
            const qreal deltaX = qMin( r.width()/qreal(2), deltaY );
            path.moveTo( r.topLeft() );
            path.lineTo( r.topRight() );
            path.lineTo( QPointF( r.right(), r.top() + 2.*deltaY ) );
            //path.lineTo( QPointF( r.right()-3./2.*delta, r.top() + delta ) );
            path.quadTo( QPointF( r.right()-.5*deltaX, r.top() + deltaY ), QPointF( r.right()-2.*deltaX, r.top() + deltaY ) );
            //path.lineTo( QPointF( r.left()+3./2.*delta, r.top() + delta ) );
            path.lineTo( QPointF( r.left() + 2.*deltaX, r.top() + deltaY ) );
            path.quadTo( QPointF( r.left()+.5*deltaX, r.top() + deltaY ), QPointF( r.left(), r.top() + 2.*deltaY ) );
            path.closeSubpath();
            painter->setBrushOrigin( itemRect.topLeft() );
            painter->save();
            painter->translate( 0.5, 0.5 );
            painter->drawPath( path );
            painter->restore();
            Qt::Alignment ta;
            switch( opt.displayPosition ) {
            case StyleOptionGanttItem::Left: ta = Qt::AlignLeft; break;
            case StyleOptionGanttItem::Right: ta = Qt::AlignRight; break;
            case StyleOptionGanttItem::Center: ta = Qt::AlignCenter; break;
            }
            painter->drawText( boundingRect, ta | Qt::AlignVCenter, txt );
        }
        break;
    case TypeEvent: /* TODO */
        //qDebug() << opt.boundingRect << opt.itemRect;
        if ( opt.boundingRect.isValid() ) {
            const qreal pw = painter->pen().width() / 2. - 1;
            const QRectF r = QRectF( opt.rect ).adjusted( -pw, -pw, pw, pw );
            QPainterPath path;
            const qreal delta = static_cast< int >( r.height() / 2 );
            path.moveTo( delta, 0. );
            path.lineTo( 2.*delta, delta );
            path.lineTo( delta, 2.*delta );
            path.lineTo( 0., delta );
            path.closeSubpath();
            painter->save();
            painter->translate( r.topLeft() );
            painter->translate( 0.5, 0.5 );
//.........这里部分代码省略.........

  //-----------------------------------------------------------------------
  // Class MacroItem
  //-----------------------------------------------------------------------
  void MacroItem::paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget)
  {
    app::Macro::Ptr macroInstance = vertex().dataRef().staticCast<app::Macro>();
    Q_ASSERT(!macroInstance.isNull());

    graph::VertexItem::paint(painter,option,widget);
    QRectF rcInner = innerRect();

    // calculate text sizes
    QString macroName = macroInstance->getName();
    QFontMetrics fmName(*Resource::font(Resource::FONT_MACRONAME));
    QRect rectName = fmName.boundingRect(macroName);
    QString macroRuntime = macroInstance->getRuntimeString();
    QFontMetrics fmStatus(*Resource::font(Resource::FONT_MACROSTATUS));
    QRect rectRuntime = fmStatus.boundingRect("000.000 ms");
    QPixmap statusIcon;
    switch(macroInstance->getState())
    {
      case app::Macro::Idle:
        statusIcon = QPixmap(":/icons/resources/bullet_black.png");
        break;
      case app::Macro::Running:
        statusIcon = QPixmap(":/icons/resources/bullet_orange.png");
        break;
      case app::Macro::Ok:
        if (!toolTip().isEmpty()) setToolTip(QString());
        statusIcon = QPixmap(":/icons/resources/bullet_green.png");
        break;
      case app::Macro::Failure:
        setToolTip(macroInstance->getErrorMsg());
        statusIcon = QPixmap(":/icons/resources/bullet_red.png");
        break;
    }
    QString macroOrder = QString(QObject::tr("Order No.: "));
    if (vertex().topologicalOrder() >= 0)
    {
      macroOrder += QString("%1").arg(vertex().topologicalOrder());
    }
    else
    {
      macroOrder += '-';
    }
    QPixmap orderStatus;
    if (vertex().isInCycle() && vertex().topologicalOrder() == 0 && vertex().topologicalOrderForced())
    {
      orderStatus = QPixmap(":/icons/resources/anchor.png");
    }
    else if (vertex().isInCycle() && vertex().topologicalOrder() < 0 && !vertex().topologicalOrderForced())
    {
      orderStatus = QPixmap(":/icons/resources/cycle.png");
    }
    else if (!vertex().isInCycle() && vertex().topologicalOrder() < 0)
    {
      orderStatus = QPixmap(":/icons/resources/error.png");
    }
    QRect rectOrder = fmStatus.boundingRect(macroOrder);
    rectOrder.adjust(0,0,orderStatus.width(),16 - rectOrder.height());

    // paint macro name
    QRectF rcTextName(rcInner.left(),rcInner.top(),rcInner.width(),(qreal)rectName.height());
    painter->setPen(QPen(Qt::black));
    painter->setFont(*Resource::font(Resource::FONT_MACRONAME));
    painter->drawText(rcTextName,Qt::AlignCenter,macroName);
    // paint runtime including indicator
    QRectF rcTextRuntime(rcInner.left() + rcInner.width() * 0.02 + statusIcon.width(),rcInner.top() + rectName.height() + 1.0,rcInner.width() - 2 * rcInner.width() * 0.02 - statusIcon.width(),(qreal)rectRuntime.height());
    painter->setPen(QPen(Qt::blue));
    painter->setFont(*Resource::font(Resource::FONT_MACROSTATUS));
    painter->setClipRect(rcTextRuntime);
    painter->drawText(rcTextRuntime,Qt::AlignRight,macroRuntime);
    painter->setClipRect(rcInner);
    painter->drawPixmap(rcInner.left() + rcInner.width() * 0.02,rcTextRuntime.top(),statusIcon.rect().width(),statusIcon.rect().height(),statusIcon);
    // paint topological order
    QRectF rcTextOrder(rcInner.left() + orderStatus.rect().width() + (rcInner.width() - rectOrder.width()) / 2.0,rcInner.bottom() - (qreal)rectOrder.height(),rcInner.width(),(qreal)rectOrder.height());
    painter->setPen(QPen(Qt::black));
    painter->drawText(rcTextOrder,Qt::AlignLeft,macroOrder);
    if (!orderStatus.isNull())
    {
      painter->drawPixmap(rcTextOrder.left() - orderStatus.rect().width() - 1.0,rcTextOrder.top(),orderStatus.rect().width(),orderStatus.rect().height(),orderStatus);
    }
    painter->setClipRect(itemRect());
  }

static void clipSegmentToRect(qreal x0, qreal y0, qreal x1, qreal y1,
                              const QRectF &clipRect,
                              QVector<qreal> &outPoints,
                              QVector<QPainterPath::ElementType> &outTypes)
{
    int type0 = clipPointType(x0, y0, clipRect);
    int type1 = clipPointType(x1, y1, clipRect);
    bool accept = false;

    while (true) {
        if (!(type0 | type1)) {
            accept = true;
            break;
        } else if (type0 & type1) {
            break;
        } else {
            qreal x = 0.0;
            qreal y = 0.0;
            int outsideType = type0 ? type0 : type1;

            if (outsideType & BottomPoint) {
                x = x0 + (x1 - x0) * (clipRect.bottom() - y0) / (y1 - y0);
                y = clipRect.bottom() - 0.1;
            } else if (outsideType & TopPoint) {
                x = x0 + (x1 - x0) * (clipRect.top() - y0) / (y1 - y0);
                y = clipRect.top() + 0.1;
            } else if (outsideType & RightPoint) {
                y = y0 + (y1 - y0) * (clipRect.right() - x0) / (x1 - x0);
                x = clipRect.right() - 0.1;
            } else if (outsideType & LeftPoint) {
                y = y0 + (y1 - y0) * (clipRect.left() - x0) / (x1 - x0);
                x = clipRect.left() + 0.1;
            }

            if (outsideType == type0) {
                x0 = x;
                y0 = y;
                type0 = clipPointType(x0, y0, clipRect);
            } else {
                x1 = x;
                y1 = y;
                type1 = clipPointType(x1, y1, clipRect);
            }
        }
    }

    if (accept) {
        if (outPoints.size() >= 2) {
            qreal lastX, lastY;
            lastY = outPoints.at(outPoints.size() - 1);
            lastX = outPoints.at(outPoints.size() - 2);

            if (!qFuzzyCompare(lastY, y0) || !qFuzzyCompare(lastX, x0)) {
                outTypes << QPainterPath::MoveToElement;
                outPoints << x0 << y0;
            }
        } else {
            outTypes << QPainterPath::MoveToElement;
            outPoints << x0 << y0;
        }

        outTypes << QPainterPath::LineToElement;
        outPoints << x1 << y1;
    }
}

//.........这里部分代码省略.........
            {
                if ( d_data->alignCanvasToScales && rightOffset < 0 )
                {
                    canvasRect.setRight( qMin( canvasRect.right(),
                        axisRect.right() + rightOffset ) );
                }
                else
                {
                    if ( rightOffset > 0 )
                        axisRect.setRight( axisRect.right() - rightOffset );
                }
            }
        }
        else // QwtPlot::yLeft, QwtPlot::yRight
        {
            const QRectF &bottomScaleRect = scaleRect[QwtPlot::xBottom];
            const int bottomOffset =
                backboneOffset[QwtPlot::xBottom] - endDist + 1;

            if ( bottomScaleRect.isValid() )
            {
                const int dy = bottomOffset + bottomScaleRect.height();
                if ( d_data->alignCanvasToScales && dy < 0 )
                {
                    /*
                      The axis needs more space than the height
                      of the bottom scale.
                     */
                    canvasRect.setBottom( qMin( canvasRect.bottom(),
                        axisRect.bottom() + dy ) );
                }
                else
                {
                    const double maxBottom = bottomScaleRect.top() +
                        d_data->layoutData.scale[QwtPlot::xBottom].tickOffset;
                    const double bottom = axisRect.bottom() - bottomOffset;
                    axisRect.setBottom( qMin( bottom, maxBottom ) );
                }
            }
            else
            {
                if ( d_data->alignCanvasToScales && bottomOffset < 0 )
                {
                    canvasRect.setBottom( qMin( canvasRect.bottom(),
                        axisRect.bottom() + bottomOffset ) );
                }
                else
                {
                    if ( bottomOffset > 0 )
                        axisRect.setBottom( axisRect.bottom() - bottomOffset );
                }
            }

            const QRectF &topScaleRect = scaleRect[QwtPlot::xTop];
            const int topOffset = backboneOffset[QwtPlot::xTop] - startDist;

            if ( topScaleRect.isValid() )
            {
                const int dy = topOffset + topScaleRect.height();
                if ( d_data->alignCanvasToScales && dy < 0 )
                {
                    /*
                      The axis needs more space than the height
                      of the top scale.
                     */
                    canvasRect.setTop( qMax( canvasRect.top(),

	QRectF closeButtonRect(const QRectF& rect) const {
		return QRectF(rect.right()-closeButtonRectSize, rect.top(), closeButtonRectSize, closeButtonRectSize);
	}

/*!
  \brief Draw the scale
*/
void QwtPlotScaleItem::draw( QPainter *painter,
    const QwtScaleMap &xMap, const QwtScaleMap &yMap,
    const QRectF &canvasRect ) const
{
    QwtScaleDraw *sd = d_data->scaleDraw;

    if ( d_data->scaleDivFromAxis )
    {
        const QwtInterval interval = 
            d_data->scaleInterval( canvasRect, xMap, yMap );

        if ( interval != sd->scaleDiv().interval() )
        {
            QwtScaleDiv scaleDiv = sd->scaleDiv();
            scaleDiv.setInterval( interval );
            sd->setScaleDiv( scaleDiv );
        }
    }

    QPen pen = painter->pen();
    pen.setStyle( Qt::SolidLine );
    painter->setPen( pen );

    if ( sd->orientation() == Qt::Horizontal )
    {
        double y;
        if ( d_data->borderDistance >= 0 )
        {
            if ( sd->alignment() == QwtScaleDraw::BottomScale )
                y = canvasRect.top() + d_data->borderDistance;
            else
            {
                y = canvasRect.bottom() - d_data->borderDistance;
            }

        }
        else
        {
            y = yMap.transform( d_data->position );
        }

        if ( y < canvasRect.top() || y > canvasRect.bottom() )
            return;

        sd->move( canvasRect.left(), y );
        sd->setLength( canvasRect.width() - 1 );

        QwtTransform *transform = NULL;
        if ( xMap.transformation() )
            transform = xMap.transformation()->copy();

        sd->setTransformation( transform );
    }
    else // == Qt::Vertical
    {
        double x;
        if ( d_data->borderDistance >= 0 )
        {
            if ( sd->alignment() == QwtScaleDraw::RightScale )
                x = canvasRect.left() + d_data->borderDistance;
            else
            {
                x = canvasRect.right() - d_data->borderDistance;
            }
        }
        else
        {
            x = xMap.transform( d_data->position );
        }
        if ( x < canvasRect.left() || x > canvasRect.right() )
            return;

        sd->move( x, canvasRect.top() );
        sd->setLength( canvasRect.height() - 1 );

        QwtTransform *transform = NULL;
        if ( yMap.transformation() )
            transform = yMap.transformation()->copy();

        sd->setTransformation( transform );
    }

    painter->setFont( d_data->font );

    sd->draw( painter, d_data->palette );
}

void SCgAlphabet::paintStruct(QPainter *painter, const QColor &color,
                              const QRectF &boundRect, const SCgNodeStructType &type)
{
    QPen pen = QPen(QBrush(color, Qt::SolidPattern), 2, Qt::SolidLine, Qt::FlatCap, Qt::MiterJoin);
    painter->setPen(pen);

    // structure types
    QPointF c, d;
    switch (type)
    {
    case StructType_Struct:
        float w, h;
        w = boundRect.width() / 10.f;
        h = boundRect.height() / 10.f;
        painter->setBrush(QBrush(color, Qt::SolidPattern));
        painter->drawEllipse(-w, -h, w * 2 - 1, h * 2 - 1);
        painter->setBrush(QBrush(Qt::NoBrush));
        break;

    case StructType_Abstract:
    {
        QPen p = painter->pen();
        p.setWidthF(0);
        painter->setPen(p);
        qreal x1, x2, top, bottom;
        top = boundRect.top();
        bottom = boundRect.bottom();
        x1 = boundRect.left();
        x2 = boundRect.right();

        for (qreal y = top; y < bottom; y += 3)
            painter->drawLine(QLineF(x1, y, x2, y));

        break;
    }

    case StructType_Material:
    {
        QPen p = painter->pen();
        p.setWidthF(0);
        painter->setPen(p);
        qreal y1, y2, left, right;
        left = boundRect.left();
        right = boundRect.right();


        qreal dist = right - left;

        y1 = boundRect.top();
        y2 = boundRect.bottom();

        for (qreal d = 0; d <= dist; d += 4.2)
        {
            painter->drawLine(QLineF(left + d, y1, left, y1 + d));
            painter->drawLine(QLineF(right - d, y2, right, y2 - d));
        }

        break;
    }

    case StructType_Tuple:
        c = boundRect.center();
        d = QPointF(boundRect.width() / 2.0, 0.f);
        painter->drawLine(c - d, c + d);
        break;

    case StructType_Role:
        c = boundRect.center();
        d = QPointF(boundRect.width() / 2.0, 0.f);
        painter->drawLine(c - d, c + d);
        d = QPointF(0.f, boundRect.height() / 2.0);
        painter->drawLine(c - d, c + d);
        break;

    case StructType_Relation:
        painter->drawLine(boundRect.topLeft(), boundRect.bottomRight());
        painter->drawLine(boundRect.topRight(), boundRect.bottomLeft());
        break;

    case StructType_Group:
        painter->drawLine(boundRect.topLeft(), boundRect.bottomRight());
        painter->drawLine(boundRect.topRight(), boundRect.bottomLeft());
        painter->drawLine(boundRect.left(), boundRect.center().y(), boundRect.right(), boundRect.center().y());
        break;

    default:
        break;
    }
}

QVariant Pin::itemChange(GraphicsItemChange change, const QVariant &value)
{
	// Note that pins are only movable within the symbol editor.

	PageScene *pageScene = dynamic_cast<PageScene *>(scene());
	if (ItemPositionChange == change && pageScene) {
		QPointF p = value.toPointF() + pageScene->reparentOffset(this);	// p is now the position relative to the current parent.
		SymbolEditor *se = dynamic_cast<SymbolEditor *>(pageScene->parent());
		if (se) {
			QGraphicsItem *anchor = se->closestPinAnchor(parentItem()->mapToScene(p), this);
			if (parentItem() != anchor) {
				pageScene->reparentWhileDragging(this, anchor);
				p = value.toPointF() + pageScene->reparentOffset(this);
				setData(FreeSCH::SectionChanged, true);
			}
			if (QGraphicsLineItem::Type == anchor->type()) {
				p.setX(anchor->pos().x());
				if (position.side() != PinPosition::Right) {
					position.setSide(PinPosition::Right);
					attributes.setValue("side", PinPosition::sideNames.at(PinPosition::Right));
					reorient();
				}
			} else if (Section::Type == anchor->type()) {
				Section *section = qgraphicsitem_cast<Section *>(anchor);
				if (section) {
					QRectF r = QRectF(QPointF(0,0), section->rect().size());
					PinPosition::PinSide newside = PinPosition::sideIndex(r, p);
					switch (newside) {
					case PinPosition::Right:
						p.setX(r.right());
						break;
					case PinPosition::Bottom:
						p.setY(r.bottom());
						break;
					case PinPosition::Left:
						p.setX(r.left());
						break;
					default: // top
						p.setY(r.top());
						break;
					}
					if (p.x() < 0)
						p.setX(0);
					if (p.x() > r.width())
						p.setX(r.width());
					if (p.y() < 0)
						p.setY(0);
					if (p.y() > r.height())
						p.setY(r.height());

					if (position.side() != newside) {
						position.setSide(newside);
						attributes.setValue("side", PinPosition::sideNames.at(newside));
						updateOffset(snap(p).toPoint());
						reorient();
						// As the pin moves around a corner of a section, it can switch sides without its pos() changing.
						// In that case the ItemPositionHasChanged event doesn't occur. So we need to emit the moved signal here.

						emit moved();
					}
				}
			}
		}
		return snap(p);
	}
	if (ItemPositionHasChanged == change && pageScene) {
		updateOffset(pos().toPoint());

		if (data(FreeSCH::SectionChanged).toBool()) {
			setData(FreeSCH::SectionChanged, false);
			emit sectionChanged(this, parentItem());
		}
		emit moved();
	}
	return QGraphicsItem::itemChange(change, value);
}

void UBGraphicsTriangle::calculatePoints(const QRectF& r)
{
    switch(mOrientation)
    {

    case BottomLeft:
        A1.setX(r.left()); A1.setY(r.top());
        B1.setX(r.left()); B1.setY(r.bottom());
        C1.setX(r.right()); C1.setY(r.bottom());
        break;
    case TopLeft:
        A1.setX(r.left()); A1.setY(r.bottom());
        B1.setX(r.left()); B1.setY(r.top());
        C1.setX(r.right()); C1.setY(r.top());
        break;
    case TopRight:
        A1.setX(r.right()); A1.setY(r.bottom());
        B1.setX(r.right()); B1.setY(r.top());
        C1.setX(r.left()); C1.setY(r.top());
        break;
    case BottomRight:
        A1.setX(r.right()); A1.setY(r.top());
        B1.setX(r.right()); B1.setY(r.bottom());
        C1.setX(r.left()); C1.setY(r.bottom());
        break;
    }

    C = sqrt(rect().width() * rect().width() + rect().height() * rect().height());
    qreal L = (C * d + rect().width() * d)/ rect().height();
    qreal K = (C * d + rect().height() * d)/ rect().width();

    switch(mOrientation)
    {
        case BottomLeft:
            A2.setX(r.left() + d); A2.setY(r.top() + K);
            B2.setX(r.left() + d); B2.setY(r.bottom() - d);
            C2.setX(r.right() - L); C2.setY(r.bottom() - d);
            break;
        case TopLeft:
            A2.setX(r.left() + d); A2.setY(r.bottom() - K);
            B2.setX(r.left() + d); B2.setY(r.top() + d);
            C2.setX(r.right() - L); C2.setY(r.top() + d);
            break;
        case TopRight:
            A2.setX(r.right() - d); A2.setY(r.bottom() - K);
            B2.setX(r.right() - d); B2.setY(r.top() + d);
            C2.setX(r.left() + L); C2.setY(r.top() + d);
            break;
        case BottomRight:
            A2.setX(r.right() - d); A2.setY(r.top() + K);
            B2.setX(r.right() - d); B2.setY(r.bottom() - d);
            C2.setX(r.left() + L); C2.setY(r.bottom() - d);
            break;
    }
    W1 = rect().height() * d / C;
    H1 = rect().width() * d / C;

    switch(mOrientation)
    {
        case BottomLeft:
            CC.setX(r.right() - L + W1); CC.setY(r.bottom() - d - H1);
            break;
        case TopLeft:
            CC.setX(r.right() - L + W1); CC.setY(r.top() + d + H1);
            break;
        case TopRight:
            CC.setX(r.left() + L - W1); CC.setY(r.top() + d + H1);
            break;
        case BottomRight:
            CC.setX(r.left() + L - W1); CC.setY(r.top() - d - H1);
            break;
    }
}

static void _q_boundGeometryToSizeConstraints(const QRectF &startGeometry,
                                              QRectF *rect, Qt::WindowFrameSection section,
                                              const QSizeF &min, const QSizeF &max,
                                              const QGraphicsWidget *widget)
{
    const QRectF proposedRect = *rect;
    qreal width = qBound(min.width(), proposedRect.width(), max.width());
    qreal height = qBound(min.height(), proposedRect.height(), max.height());

    const bool hasHFW = QGraphicsLayoutItemPrivate::get(widget)->hasHeightForWidth();
    const bool hasWFH = QGraphicsLayoutItemPrivate::get(widget)->hasWidthForHeight();

    const bool widthChanged = proposedRect.width() != widget->size().width();
    const bool heightChanged = proposedRect.height() != widget->size().height();

    if (hasHFW || hasWFH) {
        if (widthChanged || heightChanged) {
            qreal minExtent;
            qreal maxExtent;
            qreal constraint;
            qreal proposed;
            if (hasHFW) {
                minExtent = min.height();
                maxExtent = max.height();
                constraint = width;
                proposed = proposedRect.height();
            } else {
                // width for height
                minExtent = min.width();
                maxExtent = max.width();
                constraint = height;
                proposed = proposedRect.width();
            }
            if (minimumHeightForWidth(constraint, minExtent, maxExtent, widget, hasHFW) > proposed) {
                QSizeF effectiveSize = closestAcceptableSize(QSizeF(width, height), widget);
                width = effectiveSize.width();
                height = effectiveSize.height();
            }
        }
    }

    switch (section) {
    case Qt::LeftSection:
        rect->setRect(startGeometry.right() - qRound(width), startGeometry.top(),
                      qRound(width), startGeometry.height());
        break;
    case Qt::TopLeftSection:
        rect->setRect(startGeometry.right() - qRound(width), startGeometry.bottom() - qRound(height),
                      qRound(width), qRound(height));
        break;
    case Qt::TopSection:
        rect->setRect(startGeometry.left(), startGeometry.bottom() - qRound(height),
                      startGeometry.width(), qRound(height));
        break;
    case Qt::TopRightSection:
        rect->setTop(rect->bottom() - qRound(height));
        rect->setWidth(qRound(width));
        break;
    case Qt::RightSection:
        rect->setWidth(qRound(width));
        break;
    case Qt::BottomRightSection:
        rect->setWidth(qRound(width));
        rect->setHeight(qRound(height));
        break;
    case Qt::BottomSection:
        rect->setHeight(qRound(height));
        break;
    case Qt::BottomLeftSection:
        rect->setRect(startGeometry.right() - qRound(width), startGeometry.top(),
                      qRound(width), qRound(height));
        break;
    default:
        break;
    }
}

static QPointF topCenter(const QRectF &rect)
{
    return QPointF(rect.center().x(), rect.top());
}

void ShaderEffect::updateRenderTargets()
{
    if (!m_changed)
        return;

    m_changed = false;

    int count = m_renderTargets.count();
    for (int i = 0; i < count; i++) {
        if (m_renderTargets[i]->isLive() || m_renderTargets[i]->isDirtyTexture()) {
            m_renderTargets[i]->updateBackbuffer();
            ShaderEffectBuffer* target = m_renderTargets[i]->fbo();
            if (target && target->isValid() && target->width() > 0 && target->height() > 0) {
                QPainter p(target);
                p.setCompositionMode(QPainter::CompositionMode_Clear);
                p.fillRect(QRect(QPoint(0, 0), target->size()), Qt::transparent);
                p.setCompositionMode(QPainter::CompositionMode_SourceOver);

                QRectF sourceRect = m_renderTargets[i]->sourceRect();
                QSize textureSize = m_renderTargets[i]->textureSize();

                qreal yflip = m_renderTargets[i]->isMirrored() ? -1.0 : 1.0; // flip y to match scenegraph, it also flips texturecoordinates
                qreal xscale = 1.0;
                qreal yscale = 1.0 * yflip;

                qreal leftMargin = 0.0;
                qreal rightMargin = 0.0;
                qreal topMargin = 0.0;
                qreal bottomMargin = 0.0;

                qreal width = m_renderTargets[i]->sourceItem()->width();
                qreal height = m_renderTargets[i]->sourceItem()->height();

                if (!sourceRect.isEmpty()) {
                    leftMargin = -sourceRect.left();
                    rightMargin = sourceRect.right() - width;
                    topMargin = -sourceRect.top();
                    bottomMargin = sourceRect.bottom() - height;
                }

                if ((width + leftMargin + rightMargin) > 0 && (height + topMargin + bottomMargin) > 0) {
                    if (!textureSize.isEmpty()) {
                        qreal textureWidth = textureSize.width();
                        qreal textureHeight = textureSize.height();

                        xscale = width / (width + leftMargin + rightMargin);
                        yscale = height / (height + topMargin + bottomMargin);

                        p.translate(textureWidth / 2, textureHeight / 2);
                        p.scale(xscale, yscale * yflip);
                        p.translate(-textureWidth / 2, -textureHeight / 2);
                        p.scale(textureWidth / width, textureHeight / height);
                    } else {
                        xscale = width / (width + leftMargin + rightMargin);
                        yscale = height / (height + topMargin + bottomMargin);

                        p.translate(width / 2, height / 2);
                        p.scale(xscale, yscale * yflip);
                        p.translate(-width / 2, -height / 2);
                    }
                }

                drawSource(&p);
                p.end();
                m_renderTargets[i]->markSceneGraphDirty();
            }
        }
    }
}

QRectF QgsComposerItem::evalItemRect( const QRectF &newRect, const bool resizeOnly, const QgsExpressionContext* context )
{
  QRectF result = newRect;

  //TODO QGIS 3.0
  //maintain pre 2.12 API. remove when API break allowed
  QScopedPointer< QgsExpressionContext > scopedContext;
  const QgsExpressionContext* evalContext = context;
  if ( !evalContext )
  {
    scopedContext.reset( createExpressionContext() );
    evalContext = scopedContext.data();
  }

  //data defined position or size set? if so, update rect with data defined values
  QVariant exprVal;
  //evaulate width and height first, since they may affect position if non-top-left reference point set
  if ( dataDefinedEvaluate( QgsComposerObject::ItemWidth, exprVal, *evalContext ) )
  {
    bool ok;
    double width = exprVal.toDouble( &ok );
    QgsDebugMsg( QString( "exprVal Width:%1" ).arg( width ) );
    if ( ok && !exprVal.isNull() )
    {
      result.setWidth( width );
    }
  }
  if ( dataDefinedEvaluate( QgsComposerObject::ItemHeight, exprVal, *evalContext ) )
  {
    bool ok;
    double height = exprVal.toDouble( &ok );
    QgsDebugMsg( QString( "exprVal Height:%1" ).arg( height ) );
    if ( ok && !exprVal.isNull() )
    {
      result.setHeight( height );
    }
  }

  double x = result.left();
  //initially adjust for position mode to get x coordinate
  if ( !resizeOnly )
  {
    //adjust x-coordinate if placement is not done to a left point
    if ( mLastUsedPositionMode == UpperMiddle || mLastUsedPositionMode == Middle || mLastUsedPositionMode == LowerMiddle )
    {
      x += newRect.width() / 2.0;
    }
    else if ( mLastUsedPositionMode == UpperRight || mLastUsedPositionMode == MiddleRight || mLastUsedPositionMode == LowerRight )
    {
      x += newRect.width();
    }
  }
  else
  {
    if ( mLastUsedPositionMode == UpperMiddle || mLastUsedPositionMode == Middle || mLastUsedPositionMode == LowerMiddle )
    {
      x += rect().width() / 2.0;
    }
    else if ( mLastUsedPositionMode == UpperRight || mLastUsedPositionMode == MiddleRight || mLastUsedPositionMode == LowerRight )
    {
      x += rect().width();
    }
  }
  if ( dataDefinedEvaluate( QgsComposerObject::PositionX, exprVal, *evalContext ) )
  {
    bool ok;
    double positionX = exprVal.toDouble( &ok );
    QgsDebugMsg( QString( "exprVal Position X:%1" ).arg( positionX ) );
    if ( ok && !exprVal.isNull() )
    {
      x = positionX;
    }
  }

  double y = result.top();
  //initially adjust for position mode to get y coordinate
  if ( !resizeOnly )
  {
    //adjust y-coordinate if placement is not done to an upper point
    if ( mLastUsedPositionMode == MiddleLeft || mLastUsedPositionMode == Middle || mLastUsedPositionMode == MiddleRight )
    {
      y += newRect.height() / 2.0;
    }
    else if ( mLastUsedPositionMode == LowerLeft || mLastUsedPositionMode == LowerMiddle || mLastUsedPositionMode == LowerRight )
    {
      y += newRect.height();
    }
  }
  else
  {
    if ( mLastUsedPositionMode == MiddleLeft || mLastUsedPositionMode == Middle || mLastUsedPositionMode == MiddleRight )
    {
      y += rect().height() / 2.0;
    }
    else if ( mLastUsedPositionMode == LowerLeft || mLastUsedPositionMode == LowerMiddle || mLastUsedPositionMode == LowerRight )
    {
      y += rect().height();
    }
  }
  if ( dataDefinedEvaluate( QgsComposerObject::PositionY, exprVal, *evalContext ) )
//.........这里部分代码省略.........

void GridItem::draw( QPainter *painter,
    const QwtScaleMap &xMap, const QwtScaleMap &yMap,
    const QRectF &canvasRect ) const
{
    const bool doAlign = QwtPainter::roundingAlignment( painter );

    const QRectF area = QwtScaleMap::invTransform( xMap, yMap, canvasRect );

    QList<double> xValues;
    if ( m_orientations & Qt::Horizontal )
    {
        xValues = m_xScaleDiv.ticks( QwtScaleDiv::MajorTick );

        if ( m_isXMinEnabled )
        {
            xValues += m_xScaleDiv.ticks( QwtScaleDiv::MediumTick );
            xValues += m_xScaleDiv.ticks( QwtScaleDiv::MinorTick );
        }

        if ( m_gridAttributes & FillCanvas )
        {
            xValues += area.left();
            xValues += area.right();
        }

        qSort( xValues );
    }

    QList<double> yValues;
    if ( m_orientations & Qt::Vertical )
    {
        yValues = m_yScaleDiv.ticks( QwtScaleDiv::MajorTick );

        if ( m_isYMinEnabled )
        {
            yValues += m_yScaleDiv.ticks( QwtScaleDiv::MediumTick );
            yValues += m_yScaleDiv.ticks( QwtScaleDiv::MinorTick );
        }

        if ( m_gridAttributes & FillCanvas )
        {
            yValues += area.top();
            yValues += area.bottom();
        }

        qSort( yValues );
    }

    painter->setPen( Qt::NoPen );

    if ( ( m_orientations & Qt::Horizontal ) &&
        ( m_orientations & Qt::Vertical ) )
    {
        for ( int i = 1; i < xValues.size(); i++ )
        {
            double x1 = xMap.transform( xValues[i - 1] );
            double x2 = xMap.transform( xValues[i] );

            if ( doAlign )
            {
                x1 = qRound( x1 );
                x2 = qRound( x2 );
            }

            for ( int j = 1; j < yValues.size(); j++ )
            {
                const QRectF rect( xValues[i - 1], yValues[j - 1],
                    xValues[i] - xValues[i - 1], yValues[j] - yValues[j - 1] );

                painter->setBrush( brush( i - 1, j - 1, rect ) );

                double y1 = yMap.transform( yValues[j - 1] );
                double y2 = yMap.transform( yValues[j] );

                if ( doAlign )
                {
                    y1 = qRound( y1 );
                    y2 = qRound( y2 );
                }

                QwtPainter::drawRect( painter, x1, y1, x2 - x1, y2 - y1 );
            }
        }
    }
    else if ( m_orientations & Qt::Horizontal )
    {
        for ( int i = 1; i < xValues.size(); i++ )
        {
            const QRectF rect( xValues[i - 1], area.top(),
                xValues[i] - xValues[i - 1], area.bottom() );

            painter->setBrush( brush( i - 1, 0, rect ) );

            double x1 = xMap.transform( xValues[i - 1] );
            double x2 = xMap.transform( xValues[i] );

            if ( doAlign )
            {
                x1 = qRound( x1 );
                x2 = qRound( x2 );
//.........这里部分代码省略.........

TableHandle PageItem_Table::hitTest(const QPointF& point, double threshold) const
{
	const QPointF framePoint = getTransform().inverted().map(point);
	const QPointF gridPoint = framePoint - gridOffset();
	const QRectF gridRect = QRectF(0.0, 0.0, tableWidth(), tableHeight());

	// Test if hit is outside frame.
	if (!QRectF(0.0, 0.0, width(), height()).contains(framePoint))
		return TableHandle(TableHandle::None);

	// Test if hit is outside table.
	if (!gridRect.adjusted(-threshold, -threshold, threshold, threshold).contains(gridPoint))
		return TableHandle(TableHandle::None);

	const double tableHeight = this->tableHeight();
	const double tableWidth = this->tableWidth();
	const double x = gridPoint.x();
	const double y = gridPoint.y();

	// Test if hit is on left edge of table.
	if (x <= threshold)
		return TableHandle(TableHandle::RowSelect);

	// Test if hit is on top edge of table.
	if (y <= threshold)
		return TableHandle(TableHandle::ColumnSelect);

	// Test if hit is on bottom right corner of table.
	if (x >= tableWidth - threshold && y >= tableHeight - threshold)
		return TableHandle(TableHandle::TableResize);

	// Test if hit is on right edge of table.
	if (y >= tableHeight - threshold && y <= tableHeight + threshold)
		return TableHandle(TableHandle::RowResize, rows() - 1);

	// Test if hit is on bottom edge of table.
	if (x >= tableWidth - threshold && x <= tableWidth + threshold)
		return TableHandle(TableHandle::ColumnResize, columns() - 1);

	const TableCell hitCell = cellAt(point);
	const QRectF hitRect = hitCell.boundingRect();

	// Test if hit is on cell interior.
	if (hitRect.adjusted(threshold, threshold, -threshold, -threshold).contains(gridPoint))
		return TableHandle(TableHandle::CellSelect); // Hit interior of cell.

	const double toLeft = x - hitRect.left();
	const double toRight = hitRect.right() - x;
	const double toTop = y - hitRect.top();
	const double toBottom = hitRect.bottom() - y;
	TableHandle handle(TableHandle::None);

	// Test which side of the cell was hit.
	if (qMin(toLeft, toRight) < qMin(toTop, toBottom))
	{
		handle.setType(TableHandle::ColumnResize);
		handle.setIndex((toLeft < toRight ? hitCell.column() : hitCell.column() + hitCell.columnSpan()) - 1);
	}
	else
	{
		handle.setType(TableHandle::RowResize);
		handle.setIndex((toTop < toBottom ? hitCell.row() : hitCell.row() + hitCell.rowSpan()) - 1);
	}
	return handle;
}