#include "toonzqt/schematicnode.h"

#include "toonzqt/stageschematicscene.h"

#include "toonzqt/fxschematicscene.h"

#include <qgraphicsscenemouseevent></qgraphicsscenemouseevent>

#include <qstyleoptiongraphicsitem></qstyleoptiongraphicsitem>

#include <qkeyevent></qkeyevent>

#include <algorithm></algorithm>

#include <qapplication></qapplication>

#include <qtextdocument></qtextdocument>

#include <qtextcursor></qtextcursor>

#include <qtextblock></qtextblock>

#include <qmenubar></qmenubar>

#include <qpolygonf></qpolygonf>

#include <qdesktopwidget></qdesktopwidget>

#include <qclipboard></qclipboard>

#include "tundo.h"

#include "toonzqt/menubarcommand.h"

#include "toonzqt/gutil.h"

#define ACCEL_KEY(k)                                                           \

  (!QCoreApplication::testAttribute(Qt::AA_DontShowShortcutsInContextMenus)    \

       ? QLatin1Char('\t') +                                                   \

             QKeySequence(k).toString(QKeySequence::NativeText)                \

       : QString())

//========================================================

//

// StageSchematicName

//

//========================================================

SchematicName::SchematicName(QGraphicsItem *parent, double width, double height)

    : QGraphicsTextItem("", parent)

    , m_width(width)

    , m_height(height)

    , m_defName("")

    , m_curName("")

    , m_refocus(false) {

  setFlag(QGraphicsItem::ItemIsSelectable, true);

  setFlag(QGraphicsItem::ItemIsFocusable, true);

  setTextInteractionFlags(Qt::TextEditorInteraction);

  popup = new QMenu();

  popup->setObjectName(QLatin1String("qt_edit_menu"));

  actionCut = popup->addAction(tr("Cu&t") + ACCEL_KEY(QKeySequence::Cut), this,

                               SLOT(onCut()));

  actionCut->setObjectName(QStringLiteral("edit-cut"));

  actionCopy = popup->addAction(tr("&Copy") + ACCEL_KEY(QKeySequence::Copy),

                                this, SLOT(onCopy()));

  actionCopy->setObjectName(QStringLiteral("edit-copy"));

  actionPaste = popup->addAction(tr("&Paste") + ACCEL_KEY(QKeySequence::Paste),

                                 this, SLOT(onPaste()));

  actionPaste->setObjectName(QStringLiteral("edit-paste"));

  actionDelete = popup->addAction(

      tr("&Delete") + ACCEL_KEY(QKeySequence::Delete), this, SLOT(onDelete()));

  actionDelete->setObjectName(QStringLiteral("edit-delete"));

  popup->addSeparator();

  actionSelectAll =

      popup->addAction(tr("Select &All") + ACCEL_KEY(QKeySequence::SelectAll),

                       this, SLOT(onSelectAll()));

  actionSelectAll->setObjectName(QStringLiteral("select-all"));

  connect(document(), SIGNAL(contentsChanged()), this,

          SLOT(onContentsChanged()));

  connect(popup, SIGNAL(aboutToHide()), this, SLOT(onPopupHide()));

}

//--------------------------------------------------------

SchematicName::~SchematicName() { delete popup; }

//--------------------------------------------------------

void SchematicName::setName(const QString &name) {

  m_defName = name;

  setPlainText(name);

}

//--------------------------------------------------------

void SchematicName::acceptName(const QString &name) {

  m_curName = name;

  m_curName.remove(QRegExp("[\\n\\r]"));  // remove all newlines

  setPlainText(m_curName);

}

//--------------------------------------------------------

void SchematicName::onContentsChanged() {

  QString text       = document()->toPlainText();

  QTextCursor cursor = textCursor();

  int position       = cursor.position();

  if (position > 0 && text.at(position - 1) == '\n') {

    text.remove("\n");

    if (text.isEmpty()) text = m_defName;

    acceptName(text);

    ;

    emit focusOut();

  }

}

//--------------------------------------------------------

void SchematicName::focusOutEvent(QFocusEvent *fe) {

  qApp->removeEventFilter(this);

  if (fe->reason() == Qt::MouseFocusReason) {

    acceptName(toPlainText());

    emit focusOut();

  }

}

//--------------------------------------------------------

void SchematicName::keyPressEvent(QKeyEvent *ke) {

  if (ke->key() == Qt::Key_Left || ke->key() == Qt::Key_Right) {

    QTextCursor cursor = textCursor();

    int currentPos     = cursor.position();

    if (ke->key() == Qt::Key_Left)

      cursor.setPosition(currentPos - 1);

    else

      cursor.setPosition(currentPos + 1);

    setTextCursor(cursor);

  } else if (ke->key() == Qt::Key_Escape) {

    setPlainText(m_curName);

    emit focusOut();

  } else

    QGraphicsTextItem::keyPressEvent(ke);

}

//--------------------------------------------------------

bool SchematicName::eventFilter(QObject *object, QEvent *event) {

  if (event->type() == QEvent::Shortcut ||

      event->type() == QEvent::ShortcutOverride) {

    if (!object->inherits("QGraphicsView")) {

      event->accept();

      return true;

    }

  }

  return false;

}

//--------------------------------------------------------

void SchematicName::focusInEvent(QFocusEvent *fe) {

  QGraphicsTextItem::focusInEvent(fe);

  qApp->installEventFilter(this);

  if (!m_refocus) {

    QTextDocument *doc = document();

    QTextCursor cursor(doc->begin());

    cursor.select(QTextCursor::Document);

    setTextCursor(cursor);

    m_curName = toPlainText();

  }

}

//--------------------------------------------------------

void SchematicName::contextMenuEvent(QGraphicsSceneContextMenuEvent *cme) {

  QClipboard *clipboard = QApplication::clipboard();

  QTextCursor cursor    = textCursor();

  actionCut->setEnabled(cursor.hasSelection());

  actionCopy->setEnabled(cursor.hasSelection());

  actionPaste->setEnabled(!clipboard->text().isEmpty());

  actionDelete->setEnabled(cursor.hasSelection());

  actionSelectAll->setEnabled(cursor.selectedText() != toPlainText());

  popup->popup(cme->screenPos());

}

//--------------------------------------------------------

void SchematicName::onPopupHide() {

  m_refocus = true;

  setFocus();

  m_refocus = false;

}

//--------------------------------------------------------

void SchematicName::onCut() {

  QClipboard *clipboard = QApplication::clipboard();

  QTextCursor cursor    = textCursor();

  QString plainText     = toPlainText();

  if (cursor.hasSelection()) {

    int p             = cursor.selectionStart();

    int n             = cursor.selectionEnd() - p;

    QString selection = plainText.mid(p, n);

    clipboard->setText(selection);

    plainText.remove(p, n);

    acceptName(plainText);

    cursor.setPosition(p);

    setTextCursor(cursor);

  }

}

//--------------------------------------------------------

void SchematicName::onCopy() {

  QClipboard *clipboard = QApplication::clipboard();

  QTextCursor cursor    = textCursor();

  QString plainText     = toPlainText();

  if (cursor.hasSelection()) {

    int p = cursor.selectionStart();

    int n = cursor.selectionEnd() - p;

    clipboard->setText(plainText.mid(p, n));

  } else {

    clipboard->setText(plainText);

  }

}

//--------------------------------------------------------

void SchematicName::onPaste() {

  QClipboard *clipboard = QApplication::clipboard();

  QTextCursor cursor    = textCursor();

  QString plainText     = toPlainText();

  QString clipboardText = clipboard->text();

  clipboardText.remove(QRegExp("[\\n\\r]"));  // remove all newlines

  int n, p = cursor.position();

  if (cursor.hasSelection()) {

    p = cursor.selectionStart();

    n = cursor.selectionEnd() - p;

    plainText.remove(p, n);

    plainText.insert(p, clipboardText);

  } else {

    plainText.insert(p, clipboardText);

  }

  acceptName(plainText);

  cursor.setPosition(p + clipboardText.length());

  setTextCursor(cursor);

}

//--------------------------------------------------------

void SchematicName::onDelete() {

  QClipboard *clipboard = QApplication::clipboard();

  QTextCursor cursor    = textCursor();

  QString plainText     = toPlainText();

  if (cursor.hasSelection()) {

    int p = cursor.selectionStart();

    int n = cursor.selectionEnd() - p;

    plainText.remove(p, n);

    acceptName(plainText);

    cursor.setPosition(p);

    setTextCursor(cursor);

  }

}

//--------------------------------------------------------

void SchematicName::onSelectAll() {

  QTextDocument *doc = document();

  QTextCursor cursor(doc->begin());

  cursor.select(QTextCursor::Document);

  setTextCursor(cursor);

}

//========================================================

//

// class SchematicThumbnailToggle

//

//========================================================

SchematicThumbnailToggle::SchematicThumbnailToggle(SchematicNode *parent,

                                                   bool isOpened)

    : QGraphicsItem(parent), m_isDown(!isOpened) {}

//--------------------------------------------------------

SchematicThumbnailToggle::~SchematicThumbnailToggle() {}

//--------------------------------------------------------

QRectF SchematicThumbnailToggle::boundingRect() const {

  return QRectF(0, 0, 14, 14);

}

//--------------------------------------------------------

void SchematicThumbnailToggle::paint(QPainter *painter,

                                     const QStyleOptionGraphicsItem *option,

                                     QWidget *widget) {

  QRect rect(3, 3, 8, 8);

  QRect sourceRect = scene()->views()[0]->matrix().mapRect(rect);

  static QIcon onIcon(":Resources/schematic_thumbtoggle_on.svg");

  static QIcon offIcon(":Resources/schematic_thumbtoggle_off.svg");

  QPixmap pixmap;

  if (m_isDown)

    pixmap = offIcon.pixmap(sourceRect.size());

  else

    pixmap = onIcon.pixmap(sourceRect.size());

  painter->drawPixmap(rect, pixmap);

}

//--------------------------------------------------------

void SchematicThumbnailToggle::setIsDown(bool value) {

  m_isDown = value;

  emit(toggled(!m_isDown));

}

//--------------------------------------------------------

void SchematicThumbnailToggle::mousePressEvent(QGraphicsSceneMouseEvent *me) {

  m_isDown = !m_isDown;

  emit(toggled(!m_isDown));

}

//========================================================

//

// SchematicToggle

//

//========================================================

SchematicToggle::SchematicToggle(SchematicNode *parent, const QIcon &imageOn,

                                 QColor colorOn, int flags,

                                 bool isNormalIconView)

    : QGraphicsItem(parent)

    , m_imageOn(imageOn)

    , m_imageOn2()

    , m_imageOff()

    , m_state(0)

    , m_flags(flags)

    , m_width(isNormalIconView ? 18 : 30)

    , m_height(isNormalIconView ? 7 : 5)

    , m_colorOn(colorOn)

    , m_colorOff(QColor(0, 0, 0, 0)) {}

//--------------------------------------------------------

SchematicToggle::SchematicToggle(SchematicNode *parent, const QIcon &imageOn,

                                 QColor colorOn, const QIcon &imageOff,

                                 QColor colorOff, int flags,

                                 bool isNormalIconView)

    : QGraphicsItem(parent)

    , m_imageOn(imageOn)

    , m_imageOn2()

    , m_imageOff(imageOff)

    , m_state(0)

    , m_flags(flags)

    , m_width(isNormalIconView ? 18 : 30)

    , m_height(isNormalIconView ? 7 : 5)

    , m_colorOn(colorOn)

    , m_colorOff(colorOff) {}

//--------------------------------------------------------

SchematicToggle::SchematicToggle(SchematicNode *parent, const QIcon &imageOn,

                                 const QIcon &imageOn2, QColor colorOn,

                                 int flags, bool isNormalIconView)

    : QGraphicsItem(parent)

    , m_imageOn(imageOn)

    , m_imageOn2(imageOn2)

    , m_imageOff()

    , m_state(0)

    , m_flags(flags)

    , m_width(isNormalIconView ? 18 : 30)

    , m_height(isNormalIconView ? 7 : 5)

    , m_colorOn(colorOn)

    , m_colorOff(QColor(0, 0, 0, 0)) {}

//--------------------------------------------------------

SchematicToggle::SchematicToggle(SchematicNode *parent, const QIcon &imageOn,

                                 const QIcon &imageOn2, QColor colorOn,

                                 const QIcon &imageOff, QColor colorOff,

                                 int flags, bool isNormalIconView)

    : QGraphicsItem(parent)

    , m_imageOn(imageOn)

    , m_imageOn2(imageOn2)

    , m_imageOff(imageOff)

    , m_state(0)

    , m_flags(flags)

    , m_width(isNormalIconView ? 18 : 30)

    , m_height(isNormalIconView ? 7 : 5)

    , m_colorOn(colorOn)

    , m_colorOff(colorOff) {}

//--------------------------------------------------------

SchematicToggle::~SchematicToggle() {}

//--------------------------------------------------------

QRectF SchematicToggle::boundingRect() const {

  return QRectF(0, 0, m_width, m_height);

}

//--------------------------------------------------------

void SchematicToggle::paint(QPainter *painter,

                            const QStyleOptionGraphicsItem *option,

                            QWidget *widget) {

  int rectHeight = boundingRect().height();

  int rectWidth  = boundingRect().width();

  int rectX      = boundingRect().left();

  int rectY      = boundingRect().top();

  QRect rect =

      QRect(0, 0, rectHeight, rectHeight)

          .translated(rectX + (rectWidth / 2) - (rectHeight / 2), rectY);

  if (m_state != 0) {

    QIcon &pix =

        (m_state == 2 && !m_imageOn2.isNull()) ? m_imageOn2 : m_imageOn;

    painter->fillRect(boundingRect().toRect(), m_colorOn);

    QRect sourceRect =

        scene()->views()[0]->matrix().mapRect(QRect(0, 0, 18, 17));

    QPixmap redPm = pix.pixmap(sourceRect.size());

    painter->drawPixmap(rect, redPm);

  } else if (!m_imageOff.isNull()) {

    QPen pen(m_colorOn);

    pen.setWidthF(0.5);

    painter->setPen(pen);

    painter->setBrush(m_colorOff);

    double d = pen.widthF() / 2.0;

    painter->drawRect(boundingRect().adjusted(d, d, -d, -d));

    QRect sourceRect =

        scene()->views()[0]->matrix().mapRect(QRect(0, 0, 18, 17));

    QPixmap redPm = m_imageOff.pixmap(sourceRect.size());

    painter->drawPixmap(rect, redPm);

  }

}

//--------------------------------------------------------

void SchematicToggle::mousePressEvent(QGraphicsSceneMouseEvent *me) {

  if (me->button() == Qt::LeftButton) {

    if (m_imageOn2.isNull()) {

      m_state = 1 - m_state;

      emit(toggled(m_state != 0));

    } else if (m_flags & eEnableNullState) {

      m_state = (m_state + 1) % 3;

      emit(stateChanged(m_state));

    } else {

      m_state = 3 - m_state;

      emit(stateChanged(m_state));

    }

  }

  if (me->button() == Qt::RightButton) {

    SchematicNode *parent = dynamic_cast<schematicnode *="">(this->parentItem());</schematicnode>

    if (parent) parent->onClicked();

  }

}

//--------------------------------------------------------

void SchematicToggle::contextMenuEvent(QGraphicsSceneContextMenuEvent *cme) {

  if (!(m_flags & eIsParentColumn)) return;

  if (m_imageOn2.isNull()) {

    QMenu *menu                = new QMenu(0);

    CommandManager *cmdManager = CommandManager::instance();

    menu->addAction(cmdManager->getAction("MI_EnableThisColumnOnly"));

    menu->addAction(cmdManager->getAction("MI_EnableSelectedColumns"));

    menu->addAction(cmdManager->getAction("MI_EnableAllColumns"));

    menu->addAction(cmdManager->getAction("MI_DisableAllColumns"));

    menu->addAction(cmdManager->getAction("MI_DisableSelectedColumns"));

    menu->addAction(cmdManager->getAction("MI_SwapEnabledColumns"));

    QAction *action = menu->exec(cme->screenPos());

  } else {

    QMenu *menu                = new QMenu(0);

    CommandManager *cmdManager = CommandManager::instance();

    menu->addAction(cmdManager->getAction("MI_ActivateThisColumnOnly"));

    menu->addAction(cmdManager->getAction("MI_ActivateSelectedColumns"));

    menu->addAction(cmdManager->getAction("MI_ActivateAllColumns"));

    menu->addAction(cmdManager->getAction("MI_DeactivateAllColumns"));

    menu->addAction(cmdManager->getAction("MI_DeactivateSelectedColumns"));

    menu->addAction(cmdManager->getAction("MI_ToggleColumnsActivation"));

    QAction *action = menu->exec(cme->screenPos());

  }

}

//========================================================

//--------------------------------------------------------

/*! for Spline Aim and CP toggles

 */

void SchematicToggle_SplineOptions::paint(

    QPainter *painter, const QStyleOptionGraphicsItem *option,

    QWidget *widget) {

  QRectF rect = boundingRect();

  painter->fillRect(rect, Qt::white);

  if (m_state != 0) {

    QIcon &pix =

        (m_state == 2 && !m_imageOn2.isNull()) ? m_imageOn2 : m_imageOn;

    QRect sourceRect = scene()->views()[0]->matrix().mapRect(rect.toRect());

    QPixmap redPm    = pix.pixmap(sourceRect.size());

    painter->drawPixmap(rect.toRect(), redPm);

  }

  painter->setBrush(Qt::NoBrush);

  painter->setPen(QColor(180, 180, 180, 255));

  painter->drawRect(rect);

}

//--------------------------------------------------------

/*! for Spline Aim and CP toggles

 */

void SchematicToggle_SplineOptions::mousePressEvent(

    QGraphicsSceneMouseEvent *me) {

  SchematicToggle::mousePressEvent(me);

  update();

}

//========================================================

//

// SchematicHandleSpinBox

//

//========================================================

SchematicHandleSpinBox::SchematicHandleSpinBox(QGraphicsItem *parent)

    : QGraphicsItem(parent), m_buttonState(Qt::NoButton), m_delta(0) {

  setFlag(QGraphicsItem::ItemIsSelectable, false);

  setFlag(QGraphicsItem::ItemIsFocusable, false);

  m_pixmap = QPixmap(":Resources/schematic_spin_arrows.svg");

}

//--------------------------------------------------------

SchematicHandleSpinBox::~SchematicHandleSpinBox() {}

//--------------------------------------------------------

QRectF SchematicHandleSpinBox::boundingRect() const {

  return QRectF(0, 0, 10, 10);

}

//--------------------------------------------------------

void SchematicHandleSpinBox::paint(QPainter *painter,

                                   const QStyleOptionGraphicsItem *option,

                                   QWidget *widget) {

  QRectF rect = boundingRect();

  painter->drawPixmap(rect.toRect(), m_pixmap);

  painter->setBrush(QColor(0, 0, 0, 0));

  painter->setPen(QColor(128, 128, 128, 255));

  painter->drawRect(rect);

}

//--------------------------------------------------------

void SchematicHandleSpinBox::mouseMoveEvent(QGraphicsSceneMouseEvent *me) {

  if (m_buttonState == Qt::LeftButton) {

    bool increase = false;

    int delta     = me->screenPos().y() - me->lastScreenPos().y();

    if (delta < 0) increase = true;

    m_delta += abs(delta);

    if (m_delta > 5) {

      if (increase)

        emit(modifyHandle(1));

      else

        emit(modifyHandle(-1));

      m_delta = 0;

      emit sceneChanged();

    }

  }

}

//--------------------------------------------------------

void SchematicHandleSpinBox::mousePressEvent(QGraphicsSceneMouseEvent *me) {

  m_buttonState = me->button();

  TUndoManager::manager()->beginBlock();

}

//--------------------------------------------------------

void SchematicHandleSpinBox::mouseReleaseEvent(QGraphicsSceneMouseEvent *me) {

  m_buttonState = Qt::NoButton;

  m_delta       = 0;

  TUndoManager::manager()->endBlock();

  emit handleReleased();

}

//========================================================

//

// class SchematicLink

//

//========================================================

SchematicLink::SchematicLink(QGraphicsItem *parent, QGraphicsScene *scene)

#if QT_VERSION >= 0x050000

    : QGraphicsItem(parent)

#else

    : QGraphicsItem(parent, scene)

#endif

    , m_startPort(0)

    , m_endPort(0)

    , m_path()

    , m_hitPath()

    , m_lineShaped(false)

    , m_highlighted(false) {

#if QT_VERSION >= 0x050000

  scene->addItem(this);

#endif

  setFlag(QGraphicsItem::ItemIsMovable, false);

  setFlag(QGraphicsItem::ItemIsSelectable, true);

  setFlag(QGraphicsItem::ItemIsFocusable, false);

  setZValue(0.0);

}

//--------------------------------------------------------

SchematicLink::~SchematicLink() { m_startPort = m_endPort = 0; }

//--------------------------------------------------------

QRectF SchematicLink::boundingRect() const {

  return m_hitPath.boundingRect().adjusted(-5, -5, 5, 5);

}

//--------------------------------------------------------

QPainterPath SchematicLink::shape() const { return m_hitPath; }

//--------------------------------------------------------

void SchematicLink::paint(QPainter *painter,

                          const QStyleOptionGraphicsItem *option,

                          QWidget *widget) {

  SchematicViewer *viewer;

  FxSchematicScene *fxScene = dynamic_cast<fxschematicscene *="">(scene());</fxschematicscene>

  StageSchematicScene *stageScene =

      dynamic_cast<stageschematicscene *="">(scene());</stageschematicscene>

  if (fxScene) {

    viewer = fxScene->getSchematicViewer();

  } else if (stageScene) {

    viewer = stageScene->getSchematicViewer();

  } else {

    return;

  }

  if (getStartPort() && (getStartPort()->getType() == 100  // eStageSplinePort

                         || getStartPort()->getType() == 202)) {  // eFxLinkPort

    if (isSelected() || isHighlighted())

      painter->setPen(QPen(viewer->getMotionPathSelectedLinkColor()));

    else

      painter->setPen(QColor(viewer->getMotionPathLinkColor()));

  } else if (isSelected() || isHighlighted())

    painter->setPen(QPen(viewer->getSelectedLinkColor()));

  else if (!m_lineShaped)

    painter->setPen(QPen(viewer->getLinkColor()));

  else

    painter->setPen(QPen(QColor(170, 170, 10), 0, Qt::DashLine));

  painter->setRenderHint(QPainter::Antialiasing, true);

  painter->drawPath(m_path);

}

//--------------------------------------------------------

void SchematicLink::updatePath(const QPointF &startPos, const QPointF &endPos) {

  prepareGeometryChange();

  setPos(startPos);

  if (!m_lineShaped) {

    QPointF p0((endPos.x() - startPos.x()) * 0.5, 0);

    QPointF p1(p0.x(), endPos.y() - startPos.y());

    QPointF p2(endPos - startPos);

    m_path = QPainterPath(QPointF(0, 0));

    m_path.cubicTo(p0, p1, p2);

    QPointF h(0, 5);

    QPointF p = h;

    if (p2.y() > 0)

      p.setX(p2.x() > 0 ? -5 : 5);

    else

      p.setX(p2.x() > 0 ? 5 : -5);

    m_hitPath = QPainterPath(QPointF(0, 0));

    m_hitPath.lineTo(h);

    m_hitPath.cubicTo(p0 + p, p1 + p, p2 + h);

    m_hitPath.lineTo(p2 - h);

    m_hitPath.cubicTo(p1 - p, p0 - p, -h);

    m_hitPath.lineTo(0, 0);

  } else {

    m_path = QPainterPath(QPointF(0, 0));

    m_path.lineTo(endPos - startPos);

    m_hitPath = QPainterPath(QPointF(0, 0));

    m_hitPath.lineTo(endPos - startPos);

  }

}

//--------------------------------------------------------

void SchematicLink::updatePath(SchematicPort *startPort,

                               SchematicPort *endPort) {

  updatePath(startPort->getLinkEndPoint(), endPort->getLinkEndPoint());

}

//--------------------------------------------------------

void SchematicLink::updateEndPos(const QPointF &endPos) {

  if (m_startPort) updatePath(m_startPort->getLinkEndPoint(), endPos);

}

//--------------------------------------------------------

SchematicPort *SchematicLink::getOtherPort(const SchematicPort *port) const {

  if (port == m_startPort)

    return m_endPort;

  else if (port == m_endPort)

    return m_startPort;

  else

    return 0;

}

//--------------------------------------------------------

SchematicNode *SchematicLink::getOtherNode(const SchematicNode *node) const {

  if (node == m_startPort->getNode())

    return m_endPort->getNode();

  else if (node == m_endPort->getNode())

    return m_startPort->getNode();

  else

    return 0;

}

//--------------------------------------------------------

void SchematicLink::mousePressEvent(QGraphicsSceneMouseEvent *me) {

  QPointF pos              = me->scenePos();

  SchematicPort *startPort = getStartPort();

  SchematicPort *endPort   = getEndPort();

  if (!startPort || !endPort) {

    me->ignore();

    return;

  }

  if (startPort && endPort) {

    QRectF startRect = startPort->boundingRect();

    startRect.moveTopLeft(startPort->scenePos());

    QRectF endRect = endPort->boundingRect();

    endRect.moveTopLeft(endPort->scenePos());

    if (startRect.contains(pos) || endRect.contains(pos)) {

      me->ignore();

      return;

    }

  }

  QMatrix matrix = scene()->views()[0]->matrix();

#if QT_VERSION >= 0x050000

  double scaleFactor = sqrt(matrix.determinant());

#else

  double scaleFactor = sqrt(matrix.det());

#endif

  QPointF startPos = getStartPort()->getLinkEndPoint();

  QPointF endPos   = getEndPort()->getLinkEndPoint();

  QPointF p0((endPos.x() - startPos.x()) * 0.5, 0);

  QPointF p1(p0.x(), endPos.y() - startPos.y());

  QPointF p2(endPos - startPos);

  double sensitivity = 5 / scaleFactor;

  QPointF h(0, sensitivity);

  QPointF p = h;

  if (p2.y() > 0)

    p.setX(p2.x() > 0 ? -sensitivity : sensitivity);

  else

    p.setX(p2.x() > 0 ? sensitivity : -sensitivity);

  QPainterPath path(QPointF(0, 0));

  path.lineTo(h);

  path.cubicTo(p0 + p, p1 + p, p2 + h);

  path.lineTo(p2 - h);

  path.cubicTo(p1 - p, p0 - p, -h);

  path.lineTo(0, 0);

  if (!path.contains(me->scenePos() - scenePos())) {

    me->ignore();

    return;

  }

  if (!isSelected()) {

    if (me->modifiers() != Qt::ControlModifier) scene()->clearSelection();

    if (me->button() == Qt::LeftButton || me->button() == Qt::RightButton)

      setSelected(true);

  } else {

    if (me->modifiers() == Qt::ControlModifier &&

        me->button() == Qt::LeftButton)

      setSelected(false);

  }

}

//--------------------------------------------------------

void SchematicLink::mouseReleaseEvent(QGraphicsSceneMouseEvent *me) {

  if (me->modifiers() != Qt::ControlModifier && me->button() != Qt::RightButton)

    QGraphicsItem::mouseReleaseEvent(me);

}

//========================================================

//

// class SchematicPort

//

//========================================================

SchematicPort::SchematicPort(QGraphicsItem *parent, SchematicNode *node,

                             int type)

    : QGraphicsItem(parent)

    , m_node(node)

    , m_buttonState(Qt::NoButton)

    , m_highlighted(false)

    , m_linkingTo(0)

    , m_hook(0, 0)

    , m_type(type) {

#if QT_VERSION >= 0x050000

  setAcceptHoverEvents(false);

#else

  setAcceptsHoverEvents(false);

#endif

  setFlag(QGraphicsItem::ItemIsSelectable, false);

  setFlag(QGraphicsItem::ItemIsFocusable, false);

}

//--------------------------------------------------------

SchematicPort::~SchematicPort() { m_links.clear(); }

//--------------------------------------------------------

void SchematicPort::mouseMoveEvent(QGraphicsSceneMouseEvent *me) {

  if (m_buttonState != Qt::LeftButton) return;

  if (m_ghostLinks.isEmpty()) return;

  // Snapping

  SchematicPort *linkingTo = searchPort(me->scenePos());

  if (!linkingTo) {

    for (SchematicLink *ghostLink : m_ghostLinks) {

      ghostLink->updateEndPos(me->scenePos());

      ghostLink->getStartPort()->showSnappedLinks(m_linkingTo);

    }

    if (m_linkingTo) {

      m_linkingTo->highLight(false);

      m_linkingTo->update();

      m_linkingTo = nullptr;

    }

  }

  // if to be connected something new

  else if (linkingTo != this && m_linkingTo != linkingTo) {

    if (m_linkingTo) {

      m_linkingTo->highLight(false);

      m_linkingTo->update();

    }

    m_linkingTo = linkingTo;

    for (SchematicLink *ghostLink : m_ghostLinks) {

      ghostLink->updatePath(ghostLink->getStartPort(), linkingTo);

      ghostLink->getStartPort()->hideSnappedLinks(m_linkingTo);

    }

  }

  // autopan

  QGraphicsView *viewer = scene()->views()[0];

  viewer->setInteractive(false);

  viewer->ensureVisible(QRectF(me->scenePos(), QSizeF(1, 1)), 5, 5);

  viewer->setInteractive(true);

}

//--------------------------------------------------------

void SchematicPort::mousePressEvent(QGraphicsSceneMouseEvent *me) {

  if (!isSelected()) {

    if (me->modifiers() != Qt::ControlModifier) scene()->clearSelection();

    if (me->button() == Qt::LeftButton || me->button() == Qt::RightButton)

      getNode()->setSelected(true);

  } else {

    if (me->modifiers() == Qt::ControlModifier &&