nodeeditor/src/FlowScene.cpp at hahaton · DigitalPulseSoftware/nodeeditor · GitHub

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#include "FlowScene.hpp"

#include <iostream>

#include <stdexcept>

#include <QtWidgets/QGraphicsSceneMoveEvent>

#include <QtWidgets/QFileDialog>

#include <QtCore/QByteArray>

#include <QtCore/QBuffer>

#include <QtCore/QDataStream>

#include <QtCore/QFile>

#include <QtCore/QJsonDocument>

#include <QtCore/QJsonObject>

#include <QtCore/QJsonArray>

#include <QDebug>

#include "Node.hpp"

#include "NodeGraphicsObject.hpp"

#include "ConnectionGraphicsObject.hpp"

#include "Connection.hpp"

#include "FlowItemInterface.hpp"

#include "FlowView.hpp"

#include "DataModelRegistry.hpp"

using QtNodes::FlowScene;

using QtNodes::Node;

using QtNodes::NodeGraphicsObject;

using QtNodes::Connection;

using QtNodes::DataModelRegistry;

using QtNodes::NodeDataModel;

//using QtNodes::Properties;

using QtNodes::PortType;

using QtNodes::PortIndex;

FlowScene::

FlowScene(std::shared_ptr<DataModelRegistry> registry)

: _registry(registry)

{

setItemIndexMethod(QGraphicsScene::NoIndex);

}

FlowScene::

~FlowScene()

{

clearScene();

}

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

std::shared_ptr<Connection>

FlowScene::

createConnection(PortType connectedPort,

Node& node,

PortIndex portIndex)

{

auto connection = std::make_shared<Connection>(connectedPort, node, portIndex);

auto cgo = std::make_unique<ConnectionGraphicsObject>(*this, *connection);

// after this function connection points are set to node port

connection->setGraphicsObject(std::move(cgo));

_connections[connection->id()] = connection;

connectionCreated(*connection);

return connection;

}

std::shared_ptr<Connection>

FlowScene::

createConnection(Node& nodeIn,

PortIndex portIndexIn,

Node& nodeOut,

PortIndex portIndexOut)

{

auto connection =

std::make_shared<Connection>(nodeIn,

portIndexIn,

nodeOut,

portIndexOut);

auto cgo = std::make_unique<ConnectionGraphicsObject>(*this, *connection);

nodeIn.nodeState().setConnection(PortType::In, portIndexIn, *connection);

nodeOut.nodeState().setConnection(PortType::Out, portIndexOut, *connection);

// after this function connection points are set to node port

connection->setGraphicsObject(std::move(cgo));

// trigger data propagation

nodeOut.onDataUpdated(portIndexOut);

_connections[connection->id()] = connection;

connectionCreated(*connection);

return connection;

}

std::shared_ptr<Connection>

FlowScene::

restoreConnection(QJsonObject const &connectionJson)

{

QUuid nodeInId = QUuid(connectionJson["in_id"].toString());

QUuid nodeOutId = QUuid(connectionJson["out_id"].toString());

PortIndex portIndexIn = connectionJson["in_index"].toInt();

PortIndex portIndexOut = connectionJson["out_index"].toInt();

auto nodeIn = _nodes[nodeInId].get();

auto nodeOut = _nodes[nodeOutId].get();

return createConnection(*nodeIn, portIndexIn, *nodeOut, portIndexOut);

}

void

FlowScene::

deleteConnection(Connection& connection)

{

connectionDeleted(connection);

connection.removeFromNodes();

_connections.erase(connection.id());

}

Node&

FlowScene::

createNode(std::unique_ptr<NodeDataModel> && dataModel)

{

auto node = std::make_unique<Node>(std::move(dataModel));

auto ngo = std::make_unique<NodeGraphicsObject>(*this, *node);

node->setGraphicsObject(std::move(ngo));

auto nodePtr = node.get();

_nodes[node->id()] = std::move(node);

nodeCreated(*nodePtr);

return *nodePtr;

}

Node&

FlowScene::

restoreNode(QJsonObject const& nodeJson)

{

QString modelName = nodeJson["model"].toObject()["name"].toString();

auto dataModel = registry().create(modelName);

if (!dataModel)

throw std::logic_error(std::string("No registered model with name ") +

modelName.toLocal8Bit().data());

auto node = std::make_unique<Node>(std::move(dataModel));

auto ngo = std::make_unique<NodeGraphicsObject>(*this, *node);

node->setGraphicsObject(std::move(ngo));

node->restore(nodeJson);

auto nodePtr = node.get();

_nodes[node->id()] = std::move(node);

nodeCreated(*nodePtr);

return *nodePtr;

}

void

FlowScene::

removeNode(Node& node)

{

// call signal

nodeDeleted(node);

auto deleteConnections =

[&node, this] (PortType portType)

{

auto nodeState = node.nodeState();

auto const & nodeEntries = nodeState.getEntries(portType);

for (auto &connections : nodeEntries)

{

for (auto const &pair : connections)

deleteConnection(*pair.second);

}

};

deleteConnections(PortType::In);

deleteConnections(PortType::Out);

_nodes.erase(node.id());

}

DataModelRegistry&

FlowScene::

registry() const

{

return *_registry;

}

void

FlowScene::

setRegistry(std::shared_ptr<DataModelRegistry> registry)

{

_registry = registry;

}

void

FlowScene::

iterateOverNodes(std::function<void(Node*)> visitor)

{

for (const auto& _node : _nodes)

{

visitor(_node.second.get());

}

void

FlowScene::

iterateOverNodeData(std::function<void(NodeDataModel*)> visitor)

{

for (const auto& _node : _nodes)

{

visitor(_node.second->nodeDataModel());

}

void

FlowScene::

iterateOverNodeDataDependentOrder(std::function<void(NodeDataModel*)> visitor)

{

std::set<QUuid> visitedNodesSet;

//A leaf node is a node with no input ports, or all possible input ports empty

auto isNodeLeaf =

[](Node const &node, NodeDataModel const &model)

{

for (size_t i = 0; i < model.nPorts(PortType::In); ++i)

{

auto connections = node.nodeState().connections(PortType::In, i);

if (!connections.empty())

{

return false;

}

return true;

};

//Iterate over "leaf" nodes

for (auto const &_node : _nodes)

{

auto const &node = _node.second;

auto model = node->nodeDataModel();

if (isNodeLeaf(*node, *model))

{

visitor(model);

visitedNodesSet.insert(node->id());

}

auto areNodeInputsVisitedBefore =

[&](Node const &node, NodeDataModel const &model)

{

for (size_t i = 0; i < model.nPorts(PortType::In); ++i)

{

auto connections = node.nodeState().connections(PortType::In, i);

for (auto& conn : connections)

{

if (visitedNodesSet.find(conn.second->getNode(PortType::Out)->id()) == visitedNodesSet.end())

{

return false;

}

return true;

};

//Iterate over dependent nodes

while (_nodes.size() != visitedNodesSet.size())

{

for (auto const &_node : _nodes)

{

auto const &node = _node.second;

if (visitedNodesSet.find(node->id()) != visitedNodesSet.end())

continue;

auto model = node->nodeDataModel();

if (areNodeInputsVisitedBefore(*node, *model))

{

visitor(model);

visitedNodesSet.insert(node->id());

}

QPointF

FlowScene::

getNodePosition(const Node& node) const

{

return node.nodeGraphicsObject().pos();

}

void

FlowScene::

setNodePosition(Node& node, const QPointF& pos) const

{

node.nodeGraphicsObject().setPos(pos);

node.nodeGraphicsObject().moveConnections();

}

QSizeF

FlowScene::

getNodeSize(const Node& node) const

{

return QSizeF(node.nodeGeometry().width(), node.nodeGeometry().height());

}

std::unordered_map<QUuid, std::unique_ptr<Node> > const &

FlowScene::

nodes() const

{

return _nodes;

}

std::unordered_map<QUuid, std::shared_ptr<Connection> > const &

FlowScene::

connections() const

{

return _connections;

}

std::vector<Node*>

FlowScene::

selectedNodes() const

{

QList<QGraphicsItem*> graphicsItems = selectedItems();

std::vector<Node*> ret;

ret.reserve(graphicsItems.size());

for (QGraphicsItem* item : graphicsItems)

{

auto ngo = qgraphicsitem_cast<NodeGraphicsObject*>(item);

if (ngo != nullptr)

{

ret.push_back(&ngo->node());

}

return ret;

}

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

void

FlowScene::

clearScene()

{

//Manual node cleanup. Simply clearing the holding datastructures doesn't work, the code crashes when

// there are both nodes and connections in the scene. (The data propagation internal logic tries to propagate

// data through already freed connections.)

std::vector<Node*> nodesToDelete;

for (auto& node : _nodes)

{

nodesToDelete.push_back(node.second.get());

}

for (auto& node : nodesToDelete)

{

removeNode(*node);

}

void

FlowScene::

save() const

{

QString fileName =

QFileDialog::getSaveFileName(nullptr,

tr("Open Flow Scene"),

QDir::homePath(),

tr("Flow Scene Files (*.flow)"));

if (!fileName.isEmpty())

{

if (!fileName.endsWith("flow", Qt::CaseInsensitive))

fileName += ".flow";

QFile file(fileName);

if (file.open(QIODevice::WriteOnly))

{

file.write(saveToMemory());

}

void

FlowScene::

load()

{

clearScene();

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

QString fileName =

QFileDialog::getOpenFileName(nullptr,

tr("Open Flow Scene"),

QDir::homePath(),

tr("Flow Scene Files (*.flow)"));

if (!QFileInfo::exists(fileName))

return;

QFile file(fileName);

if (!file.open(QIODevice::ReadOnly))

return;

QByteArray wholeFile = file.readAll();

loadFromMemory(wholeFile);

}

QByteArray

FlowScene::

saveToMemory() const

{

QJsonObject sceneJson;

QJsonArray nodesJsonArray;

for (auto const & pair : _nodes)

{

auto const &node = pair.second;

nodesJsonArray.append(node->save());

}

sceneJson["nodes"] = nodesJsonArray;

QJsonArray connectionJsonArray;

for (auto const & pair : _connections)

{

auto const &connection = pair.second;

QJsonObject connectionJson = connection->save();

if (!connectionJson.isEmpty())

connectionJsonArray.append(connectionJson);

}

sceneJson["connections"] = connectionJsonArray;

QJsonDocument document(sceneJson);

return document.toJson();

}

void

FlowScene::

loadFromMemory(const QByteArray& data)

{

QJsonObject const jsonDocument = QJsonDocument::fromJson(data).object();

QJsonArray nodesJsonArray = jsonDocument["nodes"].toArray();

for (int i = 0; i < nodesJsonArray.size(); ++i)

{

restoreNode(nodesJsonArray[i].toObject());

}

QJsonArray connectionJsonArray = jsonDocument["connections"].toArray();

for (int i = 0; i < connectionJsonArray.size(); ++i)

{

restoreConnection(connectionJsonArray[i].toObject());

}

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

namespace QtNodes

{

Node*

locateNodeAt(QPointF scenePoint, FlowScene &scene,

QTransform viewTransform)

{

// items under cursor

QList<QGraphicsItem*> items =

scene.items(scenePoint,

Qt::IntersectsItemShape,

Qt::DescendingOrder,

viewTransform);

//// items convertable to NodeGraphicsObject

std::vector<QGraphicsItem*> filteredItems;

std::copy_if(items.begin(),

items.end(),

std::back_inserter(filteredItems),

[] (QGraphicsItem * item)

{

return (dynamic_cast<NodeGraphicsObject*>(item) != nullptr);

});

Node* resultNode = nullptr;

if (!filteredItems.empty())

{

QGraphicsItem* graphicsItem = filteredItems.front();

auto ngo = dynamic_cast<NodeGraphicsObject*>(graphicsItem);

resultNode = &ngo->node();

}

return resultNode;

}

nodeeditor/src/FlowScene.cpp at hahaton · DigitalPulseSoftware/nodeeditor · GitHub

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