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