qetgraphicsitem.cpp

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/*
    Copyright 2006-2019 The QElectroTech Team
    This file is part of QElectroTech.

    QElectroTech is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 2 of the License, or
    (at your option) any later version.

    QElectroTech is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
*/
#include "qetgraphicsitem.h"
#include "diagram.h"

QetGraphicsItem::QetGraphicsItem(QGraphicsItem *parent):
    QGraphicsObject(parent),
    is_movable_(true),
    m_first_move(true),
    snap_to_grid_(true)
{}

QetGraphicsItem::~QetGraphicsItem()
{}

Diagram* QetGraphicsItem::diagram() const{
    return(qobject_cast<Diagram *>(scene()));
}

void QetGraphicsItem::setPos(const QPointF &p) {
    QPointF pp = Diagram::snapToGrid(p);
    if (pp == pos() || !is_movable_)
        return;
    QGraphicsItem::setPos(pp);
}

void QetGraphicsItem::setPos(qreal x, qreal y) {
    setPos(QPointF(x, y));
}

QET::GraphicsItemState QetGraphicsItem::state() const {
    return m_state;
}

void QetGraphicsItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
    if (event->button() == Qt::LeftButton)
    {
        m_first_move = true;
        if (event->modifiers() & Qt::ControlModifier) {
            setSelected(!isSelected());
        }
    }

    QGraphicsItem::mousePressEvent(event);
}

void QetGraphicsItem::mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event)
{
    editProperty();
    event->accept();
}

void QetGraphicsItem::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
{
    if (isSelected() && event->buttons() & Qt::LeftButton)
    {
            //Item is moving
        if(diagram() && m_first_move) {
                //It's the first movement, we signal it to parent diagram
            diagram()->elementsMover().beginMovement(diagram(), this);
        }

            //we apply the mouse movement
        QPointF old_pos = pos();
        if (m_first_move) {
            m_mouse_to_origin_movement = old_pos - event -> buttonDownScenePos(Qt::LeftButton);
        }
        QPointF expected_pos = event->scenePos() + m_mouse_to_origin_movement;
        setPos(expected_pos); // setPos() will snap the expected position to the grid

            //we calcul the real movement apply by setPos()
        QPointF effective_movement = pos() - old_pos;
        if (diagram()) {
                //we signal the real movement apply to diagram,
                //who he apply to other selected item
            diagram()->elementsMover().continueMovement(effective_movement);
        }
        event->accept();
    }
    else {
        event->ignore();
    }

    if (m_first_move) {
        m_first_move = false;
    }
}

void QetGraphicsItem::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
{
    if (diagram()) {
        diagram()->elementsMover().endMovement();
        event->accept();
    }
}