editor/item.cpp

#include "item.h"
#include <QPainter>
#include <QStyleOptionGraphicsItem>

Item::Item(const QString &type, QGraphicsItem *parent)
    : QGraphicsObject(parent), type_(type)
{
    if (type == "常开")        color_ = Qt::blue;
    else if (type == "常闭")   color_ = Qt::red;
    else if (type == "比较指令") color_ = Qt::green;
    else                       color_ = Qt::darkYellow;

    setFlags(QGraphicsItem::ItemIsMovable |
             QGraphicsItem::ItemIsSelectable |
             QGraphicsItem::ItemSendsGeometryChanges);
}

QRectF Item::boundingRect() const
{
    return QRectF(0, 0, 80, 40);
}

void Item::paint(QPainter *painter,
                 const QStyleOptionGraphicsItem *,
                 QWidget *)
{
    painter->setBrush(color_.lighter(150));
    painter->setPen(QPen(color_, 2));
    painter->drawRoundedRect(boundingRect(), 5, 5);

    painter->setPen(Qt::black);
    painter->drawText(boundingRect(), Qt::AlignCenter, type_);
}