/*!

@file QNodeViewEditor.cpp

Copyright (c) 2014 Graham Wihlidal

Licensed under the Apache License, Version 2.0 (the "License");

you may not use this file except in compliance with the License.

You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software

distributed under the License is distributed on an "AS IS" BASIS,

WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

See the License for the specific language governing permissions and

limitations under the License.

@author Graham Wihlidal

@date January 19, 2014

*/

#include <QEvent>

#include <QMenu>

#include <QGraphicsView>

#include <QGraphicsScene>

#include <QGraphicsSceneMouseEvent>

#include <QNodeViewEditor.h>

#include <QNodeViewPort.h>

#include <QNodeViewConnection.h>

#include <QNodeViewBlock.h>

QNodeViewEditor::QNodeViewEditor(QObject* parent)

: QObject(parent)

, m_connection(NULL)

{

}

void QNodeViewEditor::install(QGraphicsScene* scene)

{

Q_ASSERT(scene);

scene->installEventFilter(this);

m_scene = scene;

}

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

{

QGraphicsSceneMouseEvent* mouseEvent = static_cast<QGraphicsSceneMouseEvent*>(event);

switch (static_cast<qint32>(event->type()))

{

case QEvent::GraphicsSceneMousePress:

{

switch (static_cast<qint32>(mouseEvent->button()))

{

case Qt::LeftButton:

{

QGraphicsItem* item = itemAt(mouseEvent->scenePos());

if (!item)

break;

if (item->type() == QNodeViewType_Port)

{

m_connection = new QNodeViewConnection(NULL);

m_scene->addItem(m_connection);

m_connection->setStartPort(static_cast<QNodeViewPort*>(item));

m_connection->setStartPosition(item->scenePos());

m_connection->setEndPosition(mouseEvent->scenePos());

m_connection->updatePath();

return true;

}

else if (item->type() == QNodeViewType_Block)

{

// GW-TODO: Some form of property editor callback?

}

break;

}

case Qt::RightButton:

{

QGraphicsItem* item = itemAt(mouseEvent->scenePos());

if (!item)

break;

const QPoint menuPosition = mouseEvent->screenPos();

if (item->type() == QNodeViewType_Connection)

{

showConnectionMenu(menuPosition, static_cast<QNodeViewConnection*>(item));

}

else if (item->type() == QNodeViewType_Block)

{

showBlockMenu(menuPosition, static_cast<QNodeViewBlock*>(item));

}

else if (item->type() == QNodeViewType_ConnectionSplit)

{

QNodeViewConnectionSplit* split = static_cast<QNodeViewConnectionSplit*>(item);

QNodeViewConnection* connection = split->connection();

connection->splits().removeAll(split);

delete split;

connection->updatePath();

}

break;

}

}

}

case QEvent::GraphicsSceneMouseMove:

{

if (m_connection)

{

m_connection->setEndPosition(mouseEvent->scenePos());

m_connection->updatePath();

return true;

}

break;

}

case QEvent::GraphicsSceneMouseRelease:

{

if (m_connection && mouseEvent->button() == Qt::LeftButton)

{

QGraphicsItem* item = itemAt(mouseEvent->scenePos());

if (item && item->type() == QNodeViewType_Port)

{

QNodeViewPort* startPort = m_connection->startPort();

QNodeViewPort* endPort = static_cast<QNodeViewPort*>(item);

if (startPort->block() != endPort->block() &&

startPort->isOutput() != endPort->isOutput() &&

!startPort->isConnected(endPort))

{

m_connection->setEndPosition(endPort->scenePos());

m_connection->setEndPort(endPort);

m_connection->updatePath();

m_connection = NULL;

return true;

}

}

delete m_connection;

m_connection = NULL;

return true;

}

break;

}

}

return QObject::eventFilter(object, event);

}

void QNodeViewEditor::save(QDataStream& stream)

{

Q_FOREACH (QGraphicsItem* item, m_scene->items())

{

if (item->type() == QNodeViewType_Block)

{

stream << item->type();

static_cast<QNodeViewBlock*>(item)->save(stream);

}

}

Q_FOREACH (QGraphicsItem* item, m_scene->items())

{

if (item->type() == QNodeViewType_Connection)

{

stream << item->type();

static_cast<QNodeViewConnection*>(item)->save(stream);

}

}

}

void QNodeViewEditor::load(QDataStream& stream)

{

QMap<quint64, QNodeViewPort*> portMap;

Q_ASSERT(m_scene);

m_scene->clear();

while (!stream.atEnd())

{

qint32 type;

stream >> type;

if (type == QNodeViewType_Block)

{

QNodeViewBlock* block = new QNodeViewBlock(NULL);

m_scene->addItem(block);

block->load(stream, portMap);

}

else if (type == QNodeViewType_Connection)

{

QNodeViewConnection* connection = new QNodeViewConnection(NULL);

m_scene->addItem(connection);

connection->load(stream, portMap);

}

}

}

QGraphicsItem* QNodeViewEditor::itemAt(const QPointF& point)

{

Q_ASSERT(m_scene);

QList<QGraphicsItem*> items = m_scene->items(QRectF(point - QPointF(1, 1), QSize(3, 3)));

Q_FOREACH (QGraphicsItem* item, items)

{

// Filter out non-user scene items

if (item->type() > QGraphicsItem::UserType)

return item;

}

// No user scene items found at point

return NULL;

}

void QNodeViewEditor::showBlockMenu(const QPoint& point, QNodeViewBlock* block)

{

QMenu menu;

QAction* deleteAction = menu.addAction("Delete");

QAction* selection = menu.exec(point);

if (selection == deleteAction)

{

delete block;

}

}

void QNodeViewEditor::showConnectionMenu(const QPoint& point, QNodeViewConnection* connection)

{

QMenu menu;

QAction* splitAction = menu.addAction("Split");

menu.addSeparator();

QAction* deleteAction = menu.addAction("Delete");

QAction* selection = menu.exec(point);

if (selection == deleteAction)

{

delete connection;

}

else if (selection == splitAction)

{

QNodeViewConnectionSplit* split = new QNodeViewConnectionSplit(connection);

m_scene->addItem(split);

// GW-TODO: Temp: Need to calculate multiple points

QPointF splitPosition = (connection->startPosition() + connection->endPosition()) / 2;

split->setSplitPosition(splitPosition);

split->updatePath();

connection->splits().append(split);

connection->updatePath();

}

}