qt-creator/share/qtcreator/qml/qmljsdebugger/editor/selectionrectangle.cpp

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#include "selectionrectangle.h"
#include "qmlobserverconstants.h"

#include <QPen>
#include <QGraphicsScene>
#include <QtDebug>
#include <cmath>
#include <QGraphicsScene>

namespace QmlJSDebugger {

class SelectionRectShape : public QGraphicsRectItem
{
public:
    SelectionRectShape(QGraphicsItem *parent = 0) : QGraphicsRectItem(parent) {}
    int type() const { return Constants::EditorItemType; }
};

SelectionRectangle::SelectionRectangle(QGraphicsObject *layerItem)
    : m_controlShape(new SelectionRectShape(layerItem)),
      m_layerItem(layerItem)
{
    m_controlShape->setPen(QPen(Qt::black));
    m_controlShape->setBrush(QColor(128, 128, 128, 50));
}

SelectionRectangle::~SelectionRectangle()
{
    if (m_layerItem)
        m_layerItem.data()->scene()->removeItem(m_controlShape);
}

void SelectionRectangle::clear()
{
    hide();
}
void SelectionRectangle::show()
{
    m_controlShape->show();
}

void SelectionRectangle::hide()
{
    m_controlShape->hide();
}

QRectF SelectionRectangle::rect() const
{
    return m_controlShape->mapFromScene(m_controlShape->rect()).boundingRect();
}

void SelectionRectangle::setRect(const QPointF &firstPoint,
                                 const QPointF &secondPoint)
{
    double firstX = std::floor(firstPoint.x()) + 0.5;
    double firstY = std::floor(firstPoint.y()) + 0.5;
    double secondX = std::floor(secondPoint.x()) + 0.5;
    double secondY = std::floor(secondPoint.y()) + 0.5;
    QPointF topLeftPoint(firstX < secondX ? firstX : secondX,
                         firstY < secondY ? firstY : secondY);
    QPointF bottomRightPoint(firstX > secondX ? firstX : secondX,
                             firstY > secondY ? firstY : secondY);

    QRectF rect(topLeftPoint, bottomRightPoint);
    m_controlShape->setRect(rect);
}

}