NodeEditor Class Reference

The NodeEditor class implement for QGraphicsScene an editable schematic of the dependency graph, displaying nodes and the connections between their attributes. More...

Inheritance diagram for NodeEditor:

Collaboration diagram for NodeEditor:

Signals
void	connectionIsEstablished (NodeEditorConnection *)
void	selectionModeChangeRequest (int)

Public Member Functions
	NodeEditor (QObject *parent=0)
bool	eventFilter (QObject *object, QEvent *event)
void	install (QGraphicsScene *scene)

Private Member Functions
QGraphicsItem *	itemAt (const QPointF &)
bool	processMouseMove (QGraphicsSceneMouseEvent *event)
bool	processMousePress (QGraphicsSceneMouseEvent *event)
bool	processMouseRelease (QGraphicsSceneMouseEvent *event)

Private Attributes
NodeEditorConnection *	m_conn
QGraphicsScene *	m_scene

Detailed Description

The NodeEditor class implement for QGraphicsScene an editable schematic of the dependency graph, displaying nodes and the connections between their attributes.

Definition at line 35 of file NodeEditor.h.

Constructor & Destructor Documentation

NodeEditor()

NodeEditor::NodeEditor ( QObject *  parent = 0 )

explicit

Definition at line 23 of file NodeEditor.cpp.

: QObject(parent), m_scene(0), m_conn(0) {}

Member Function Documentation

connectionIsEstablished

void NodeEditor::connectionIsEstablished ( NodeEditorConnection *  )

signal

Referenced by DesignerScene::DesignerScene(), and processMouseRelease().

eventFilter()

bool NodeEditor::eventFilter	(	QObject *	object,
		QEvent *	event
	)

Definition at line 42 of file NodeEditor.cpp.

{
    QGraphicsSceneMouseEvent* mouseEvent = dynamic_cast<QGraphicsSceneMouseEvent*>(event);
    if (!mouseEvent)
        return QObject::eventFilter(object, event);
 
    bool isProcessedEvent(false);
 
    if (event->type() == QEvent::GraphicsSceneMousePress) {
        isProcessedEvent = processMousePress(mouseEvent);
    } else if (event->type() == QEvent::GraphicsSceneMouseMove) {
        isProcessedEvent = processMouseMove(mouseEvent);
    } else if (event->type() == QEvent::GraphicsSceneMouseRelease) {
        isProcessedEvent = processMouseRelease(mouseEvent);
    }
    return isProcessedEvent ? isProcessedEvent : QObject::eventFilter(object, event);
}

References processMouseMove(), processMousePress(), and processMouseRelease().

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install()

void NodeEditor::install

(

QGraphicsScene *

scene

)

Definition at line 25 of file NodeEditor.cpp.

{
    scene->installEventFilter(this);
    m_scene = scene;
}

References m_scene.

Referenced by DesignerScene::DesignerScene().

itemAt()

QGraphicsItem * NodeEditor::itemAt ( const QPointF &  pos )

private

Definition at line 31 of file NodeEditor.cpp.

{
    QList<QGraphicsItem*> items = m_scene->items(QRectF(pos - QPointF(1, 1), QSize(3, 3)));
 
    for (QGraphicsItem* item : items)
        if (item->type() > QGraphicsItem::UserType)
            return item;
 
    return nullptr;
}

References m_scene.

Referenced by processMousePress(), and processMouseRelease().

processMouseMove()

bool NodeEditor::processMouseMove ( QGraphicsSceneMouseEvent *  event )

private

Definition at line 80 of file NodeEditor.cpp.

{
    bool result(false);
 
    if (m_conn) {
        m_conn->setPos2(event->scenePos());
        m_conn->updatePath();
        result = true;
    }
    return result;
}

References m_conn, NodeEditorConnection::setPos2(), and NodeEditorConnection::updatePath().

Referenced by eventFilter().

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processMousePress()

bool NodeEditor::processMousePress ( QGraphicsSceneMouseEvent *  event )

private

Definition at line 60 of file NodeEditor.cpp.

{
    bool result(false);
 
    if (m_conn == 0 && event->button() == Qt::LeftButton) {
        QGraphicsItem* item = itemAt(event->scenePos());
        if (item && item->type() == ViewTypes::NODE_EDITOR_PORT) {
            emit selectionModeChangeRequest(DesignerView::SIMPLE_SELECTION);
            m_conn = new NodeEditorConnection(0, m_scene);
            m_conn->setPort1((NodeEditorPort*)item);
            m_conn->setPos1(item->scenePos());
            m_conn->setPos2(event->scenePos());
            m_conn->updatePath();
 
            result = true;
        }
    }
    return result;
}

References itemAt(), m_conn, m_scene, ViewTypes::NODE_EDITOR_PORT, selectionModeChangeRequest(), NodeEditorConnection::setPort1(), NodeEditorConnection::setPos1(), NodeEditorConnection::setPos2(), DesignerView::SIMPLE_SELECTION, and NodeEditorConnection::updatePath().

Referenced by eventFilter().

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processMouseRelease()

bool NodeEditor::processMouseRelease ( QGraphicsSceneMouseEvent *  event )

private

Definition at line 92 of file NodeEditor.cpp.

{
    bool result(false);
 
    if (m_conn && event->button() == Qt::LeftButton) {
        emit selectionModeChangeRequest(DesignerView::RUBBER_SELECTION);
 
        QGraphicsItem* item = itemAt(event->scenePos());
        if (item && item->type() == ViewTypes::NODE_EDITOR_PORT) {
            NodeEditorPort* port1 = m_conn->port1();
            NodeEditorPort* port2 = (NodeEditorPort*)item;
 
            if (port1->parentItem() != port2->parentItem() && port1->isOutput() != port2->isOutput()
                && !port1->isConnected(port2) && port1->getPortType() == port2->getPortType()) {
                m_conn->setPos2(port2->scenePos());
                m_conn->setPort2(port2);
                m_conn->updatePath();
                emit connectionIsEstablished(m_conn);
                m_conn = 0;
                return true;
            }
        }
        delete m_conn;
        m_conn = 0;
        result = true;
    }
    return result;
}

References connectionIsEstablished(), NodeEditorPort::getPortType(), NodeEditorPort::isConnected(), NodeEditorPort::isOutput(), itemAt(), m_conn, ViewTypes::NODE_EDITOR_PORT, NodeEditorConnection::port1(), DesignerView::RUBBER_SELECTION, selectionModeChangeRequest(), NodeEditorConnection::setPort2(), NodeEditorConnection::setPos2(), and NodeEditorConnection::updatePath().

Referenced by eventFilter().

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selectionModeChangeRequest

void NodeEditor::selectionModeChangeRequest ( int  )

signal

Referenced by DesignerScene::DesignerScene(), processMousePress(), and processMouseRelease().

Member Data Documentation

m_conn

NodeEditorConnection* NodeEditor::m_conn

private

Definition at line 58 of file NodeEditor.h.

Referenced by processMouseMove(), processMousePress(), and processMouseRelease().

m_scene

QGraphicsScene* NodeEditor::m_scene

private

Definition at line 57 of file NodeEditor.h.

Referenced by install(), itemAt(), and processMousePress().

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The documentation for this class was generated from the following files:

• /home/www/ba/GUI/coregui/Views/SampleDesigner/NodeEditor.h
• /home/www/ba/GUI/coregui/Views/SampleDesigner/NodeEditor.cpp