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NodeConnectionInteraction.hpp

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NodeConnectionInteraction.hpp

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#pragma once
#include <memory>
#include <QtCore/QPointF>
#include "Definitions.hpp"
namespace QtNodes {
class ConnectionGraphicsObject;
class NodeGraphicsObject;
class BasicGraphicsScene;
/// Class wraps conecting and disconnecting checks.
/**
* An instance should be created on the stack and destroyed
* automatically when the operation is completed
*/
class NodeConnectionInteraction
{
public:
NodeConnectionInteraction(NodeGraphicsObject &ngo,
ConnectionGraphicsObject &cgo,
BasicGraphicsScene &scene);
/**
* Can connect when following conditions are met:
* 1. Connection 'requires' a port.
* 2. Connection loose end is above the node port.
* 3. Source and target `nodeId`s are different.
* 4. GraphModel permits connection.
*/
bool canConnect(PortIndex *portIndex) const;
/// Creates a new connectino if possible.
/**
* 1. Check conditions from 'canConnect'.
* 2. Creates new connection with `GraphModel::addConnection`.
* 3. Adjust connection geometry.
*/
bool tryConnect() const;
/**
* 1. Delete connection with `GraphModel::deleteConnection`.
* 2. Create a "draft" connection with incomplete `ConnectionId`.
* 3. Repaint both previously connected nodes.
*/
bool disconnect(PortType portToDisconnect) const;
private:
PortType connectionRequiredPort() const;
QPointF connectionEndScenePosition(PortType) const;
QPointF nodePortScenePosition(PortType portType, PortIndex portIndex) const;
PortIndex nodePortIndexUnderScenePoint(PortType portType, QPointF const &p) const;
private:
NodeGraphicsObject &_ngo;
ConnectionGraphicsObject &_cgo;
BasicGraphicsScene &_scene;
};
} // namespace QtNodes
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