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Copy pathNodeConnectionInteraction.hpp
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68 lines (50 loc) · 2 KB
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#pragma once
#include "Node.hpp"
#include "Connection.hpp"
namespace QtNodes
{
class DataModelRegistry;
class FlowScene;
class NodeDataModel;
/// Class performs various operations on the Node and Connection pair.
/// An instance should be created on the stack and destroyed when
/// the operation is completed
class NodeConnectionInteraction
{
public:
NodeConnectionInteraction(Node& node,
Connection& connection,
FlowScene& scene);
/// Can connect when following conditions are met:
/// 1) Connection 'requires' a port
/// 2) Connection's vacant end is above the node port
/// 3) Node port is vacant
/// 4) Connection type equals node port type, or there is a registered type conversion that can translate between the two
bool canConnect(PortIndex & portIndex,
TypeConverter & converter) const;
/// 1) Check conditions from 'canConnect'
/// 1.5) If the connection is possible but a type conversion is needed, add a converter node to the scene, and connect it properly
/// 2) Assign node to required port in Connection
/// 3) Assign Connection to empty port in NodeState
/// 4) Adjust Connection geometry
/// 5) Poke model to initiate data transfer
bool tryConnect() const;
/// 1) Node and Connection should be already connected
/// 2) If so, clear Connection entry in the NodeState
/// 3) Propagate invalid data to IN node
/// 4) Set Connection end to 'requiring a port'
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;
bool nodePortIsEmpty(PortType portType, PortIndex portIndex) const;
private:
Node* _node;
Connection* _connection;
FlowScene* _scene;
};
}