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qMRMLSceneModel.cxx
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qMRMLSceneModel.cxx
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/*==============================================================================
Program: 3D Slicer
Copyright (c) Kitware Inc.
See COPYRIGHT.txt
or http://www.slicer.org/copyright/copyright.txt for details.
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.
This file was originally developed by Julien Finet, Kitware Inc.
and was partially funded by NIH grant 3P41RR013218-12S1
==============================================================================*/
// Qt includes
#include <QDebug>
#include <QTimer>
// CTK includes
#include <ctkUtils.h>
// qMRML includes
#include "qMRMLSceneModel_p.h"
// MRML includes
#include <vtkMRMLDisplayableHierarchyNode.h>
#include <vtkMRMLDisplayableNode.h>
#include <vtkMRMLDisplayNode.h>
#include <vtkMRMLScene.h>
#include <vtkMRMLSelectionNode.h>
// VTK includes
#include <vtkCollection.h>
// STD includes
//------------------------------------------------------------------------------
qMRMLSceneModelPrivate::qMRMLSceneModelPrivate(qMRMLSceneModel& object)
: q_ptr(&object)
{
qRegisterMetaType<qMRMLSceneModel::NodeTypes>("qMRMLSceneModel::NodeTypes");
this->CallBack = vtkSmartPointer<vtkCallbackCommand>::New();
this->LazyUpdate = false;
this->ListenNodeModifiedEvent = qMRMLSceneModel::NoNodes;
this->PendingItemModified = -1; // -1 means not updating
this->NameColumn = -1;
this->IDColumn = -1;
this->CheckableColumn = -1;
this->VisibilityColumn = -1;
this->ToolTipNameColumn = -1;
this->ExtraItemColumn = 0;
this->HiddenIcon = QIcon(":Icons/VisibleOff.png");
this->VisibleIcon = QIcon(":Icons/VisibleOn.png");
this->PartiallyVisibleIcon = QIcon(":Icons/VisiblePartially.png");
this->DraggedItem = nullptr;
qRegisterMetaType<QStandardItem* >("QStandardItem*");
}
//------------------------------------------------------------------------------
qMRMLSceneModelPrivate::~qMRMLSceneModelPrivate()
{
if (this->MRMLScene)
{
this->MRMLScene->RemoveObserver(this->CallBack);
}
}
//------------------------------------------------------------------------------
void qMRMLSceneModelPrivate::init()
{
Q_Q(qMRMLSceneModel);
this->CallBack->SetClientData(q);
this->CallBack->SetCallback(qMRMLSceneModel::onMRMLSceneEvent);
QObject::connect(q, SIGNAL(itemChanged(QStandardItem*)),
q, SLOT(onItemChanged(QStandardItem*)));
q->setNameColumn(0);
q->setListenNodeModifiedEvent(qMRMLSceneModel::OnlyVisibleNodes);
}
//------------------------------------------------------------------------------
QModelIndexList qMRMLSceneModelPrivate::indexes(const QString& nodeID)const
{
Q_Q(const qMRMLSceneModel);
QModelIndex scene = q->mrmlSceneIndex();
if (scene == QModelIndex())
{
return QModelIndexList();
}
// QAbstractItemModel::match doesn't browse through columns
// we need to do it manually
QModelIndexList nodeIndexes = q->match(
scene, qMRMLSceneModel::UIDRole, nodeID,
1, Qt::MatchExactly | Qt::MatchRecursive);
Q_ASSERT(nodeIndexes.size() <= 1); // we know for sure it won't be more than 1
if (nodeIndexes.size() == 0)
{
return nodeIndexes;
}
// Add the QModelIndexes from the other columns
const int row = nodeIndexes[0].row();
QModelIndex nodeParentIndex = nodeIndexes[0].parent();
const int sceneColumnCount = q->columnCount(nodeParentIndex);
for (int j = 1; j < sceneColumnCount; ++j)
{
nodeIndexes << q->index(row, j, nodeParentIndex);
}
return nodeIndexes;
}
//------------------------------------------------------------------------------
void qMRMLSceneModelPrivate::listenNodeModifiedEvent()
{
Q_Q(qMRMLSceneModel);
QModelIndex sceneIndex = q->mrmlSceneIndex();
const int count = q->rowCount(sceneIndex);
for (int i = 0; i < count; ++i)
{
vtkMRMLNode* node = q->mrmlNodeFromIndex(ctk::modelChildIndex(q, sceneIndex, i, 0));
q->qvtkDisconnect(node, vtkCommand::NoEvent, q, nullptr);
if (this->ListenNodeModifiedEvent == qMRMLSceneModel::AllNodes)
{
q->observeNode(node);
}
}
}
//------------------------------------------------------------------------------
void qMRMLSceneModelPrivate::insertExtraItem(int row, QStandardItem* parent,
const QString& text,
const QString& extraType,
const Qt::ItemFlags& flags)
{
Q_ASSERT(parent);
QList<QStandardItem*> items;
// fill with empty column items
for (int column = 0; column < parent->columnCount(); ++column)
{
QStandardItem* extraItem = new QStandardItem;
if (column == this->ExtraItemColumn)
{
extraItem->setData(extraType, qMRMLSceneModel::UIDRole);
if (text == "separator")
{
extraItem->setData("separator", Qt::AccessibleDescriptionRole);
}
else
{
extraItem->setText(text);
}
extraItem->setFlags(flags);
}
else
{
extraItem->setFlags(Qt::NoItemFlags);
}
items << extraItem;
}
parent->insertRow(row, items);
// update extra item cache info (for faster retrieval)
QMap<QString, QVariant> extraItems = parent->data(qMRMLSceneModel::ExtraItemsRole).toMap();
extraItems[extraType] = extraItems[extraType].toStringList() << text;
parent->setData(extraItems, qMRMLSceneModel::ExtraItemsRole );
}
//------------------------------------------------------------------------------
QStringList qMRMLSceneModelPrivate::extraItems(QStandardItem* parent, const QString& extraType)const
{
QStringList res;
if (parent == nullptr)
{
//parent = q->invisibleRootItem();
return res;
}
// It is expensive to search, cache the extra items.
res = parent->data(qMRMLSceneModel::ExtraItemsRole).toMap()[extraType].toStringList();
/*
const int rowCount = parent->rowCount();
for (int i = 0; i < rowCount; ++i)
{
QStandardItem* child = parent->child(i);
if (child && child->data(qMRMLSceneModel::UIDRole).toString() == extraType)
{
if (child->data(Qt::AccessibleDescriptionRole) == "separator")
{
res << "separator";
}
else
{
res << child->text();
}
}
}
*/
return res;
}
//------------------------------------------------------------------------------
void qMRMLSceneModelPrivate::removeAllExtraItems(QStandardItem* parent, const QString extraType)
{
Q_Q(qMRMLSceneModel);
Q_ASSERT(parent);
QMap<QString, QVariant> extraItems =
parent->data(qMRMLSceneModel::ExtraItemsRole).toMap();
if (extraItems[extraType].toStringList().size() == 0)
{
return;
}
QModelIndex start = parent ? ctk::modelChildIndex(q, parent->index(), 0, 0) : ctk::modelChildIndex(q, QModelIndex(), 0, 0);
QModelIndexList indexes =
q->match(start, qMRMLSceneModel::UIDRole, extraType, 1, Qt::MatchExactly);
while (start != QModelIndex() && indexes.size())
{
QModelIndex parentIndex = indexes[0].parent();
int row = indexes[0].row();
q->removeRow(row, parentIndex);
// don't start the whole search from scratch, only from where we ended it
start = ctk::modelChildIndex(q, parentIndex, row, 0);
indexes = q->match(start, qMRMLSceneModel::UIDRole, extraType, 1, Qt::MatchExactly);
}
extraItems[extraType] = QStringList();
parent->setData(extraItems, qMRMLSceneModel::ExtraItemsRole);
}
//------------------------------------------------------------------------------
bool qMRMLSceneModelPrivate::isExtraItem(const QStandardItem* item)const
{
QString uid =
item ? item->data(qMRMLSceneModel::UIDRole).toString() : QString();
return uid == "preItem" || uid == "postItem";
}
//------------------------------------------------------------------------------
void qMRMLSceneModelPrivate::reparentItems(
QList<QStandardItem*>& children, int newIndex, QStandardItem* newParentItem)
{
Q_Q(qMRMLSceneModel);
int min = q->preItems(newParentItem).count();
int max = newParentItem->rowCount() - q->postItems(newParentItem).count();
int pos = qMin(min + newIndex, max);
newParentItem->insertRow(pos, children);
}
//------------------------------------------------------------------------------
// qMRMLSceneModel
//------------------------------------------------------------------------------
qMRMLSceneModel::qMRMLSceneModel(QObject *_parent)
:QStandardItemModel(_parent)
, d_ptr(new qMRMLSceneModelPrivate(*this))
{
Q_D(qMRMLSceneModel);
d->init(/*new qMRMLSceneModelItemHelperFactory*/);
}
//------------------------------------------------------------------------------
qMRMLSceneModel::qMRMLSceneModel(qMRMLSceneModelPrivate* pimpl, QObject *parentObject)
:QStandardItemModel(parentObject)
, d_ptr(pimpl)
{
Q_D(qMRMLSceneModel);
d->init(/*factory*/);
}
//------------------------------------------------------------------------------
qMRMLSceneModel::~qMRMLSceneModel() = default;
//------------------------------------------------------------------------------
void qMRMLSceneModel::setPreItems(const QStringList& extraItems, QStandardItem* parent)
{
Q_D(qMRMLSceneModel);
if (parent == nullptr)
{
return;
}
QStringList currentExtraItems = d->extraItems(parent, "preItem");
if (currentExtraItems == extraItems)
{
// no change
return;
}
d->removeAllExtraItems(parent, "preItem");
int row = 0;
foreach(QString extraItem, extraItems)
{
d->insertExtraItem(row++, parent, extraItem, "preItem", Qt::ItemIsEnabled | Qt::ItemIsSelectable);
}
}
//------------------------------------------------------------------------------
QStringList qMRMLSceneModel::preItems(QStandardItem* parent)const
{
Q_D(const qMRMLSceneModel);
return d->extraItems(parent, "preItem");
}
//------------------------------------------------------------------------------
void qMRMLSceneModel::setPostItems(const QStringList& extraItems, QStandardItem* parent)
{
Q_D(qMRMLSceneModel);
if (parent == nullptr)
{
return;
}
QStringList currentExtraItems = d->extraItems(parent, "postItem");
if (currentExtraItems == extraItems)
{
// no change
return;
}
d->removeAllExtraItems(parent, "postItem");
foreach(QString extraItem, extraItems)
{
d->insertExtraItem(parent->rowCount(), parent, extraItem, "postItem", Qt::ItemIsEnabled);
}
}
//------------------------------------------------------------------------------
QStringList qMRMLSceneModel::postItems(QStandardItem* parent)const
{
Q_D(const qMRMLSceneModel);
return d->extraItems(parent, "postItem");
}
//------------------------------------------------------------------------------
void qMRMLSceneModel::setMRMLScene(vtkMRMLScene* scene)
{
Q_D(qMRMLSceneModel);
/// it could go wrong if you try to set the same scene (specially because
/// while updating the scene your signals/slots might call setMRMLScene again
if (scene == d->MRMLScene)
{
return;
}
if (d->MRMLScene)
{
d->MRMLScene->RemoveObserver(d->CallBack);
}
d->MRMLScene = scene;
this->updateScene();
if (scene)
{
scene->AddObserver(vtkMRMLScene::NodeAboutToBeAddedEvent, d->CallBack, -10.);
scene->AddObserver(vtkMRMLScene::NodeAddedEvent, d->CallBack, 10.);
scene->AddObserver(vtkMRMLScene::NodeAboutToBeRemovedEvent, d->CallBack, -10.);
scene->AddObserver(vtkMRMLScene::NodeRemovedEvent, d->CallBack, 10.);
scene->AddObserver(vtkCommand::DeleteEvent, d->CallBack);
scene->AddObserver(vtkMRMLScene::StartCloseEvent, d->CallBack);
scene->AddObserver(vtkMRMLScene::EndCloseEvent, d->CallBack);
scene->AddObserver(vtkMRMLScene::StartImportEvent, d->CallBack);
scene->AddObserver(vtkMRMLScene::EndImportEvent, d->CallBack);
scene->AddObserver(vtkMRMLScene::StartBatchProcessEvent, d->CallBack);
scene->AddObserver(vtkMRMLScene::EndBatchProcessEvent, d->CallBack);
}
}
//------------------------------------------------------------------------------
vtkMRMLScene* qMRMLSceneModel::mrmlScene()const
{
Q_D(const qMRMLSceneModel);
return d->MRMLScene;
}
//------------------------------------------------------------------------------
QStandardItem* qMRMLSceneModel::mrmlSceneItem()const
{
Q_D(const qMRMLSceneModel);
if (d->MRMLScene == nullptr || this->maxColumnId() == -1)
{
return nullptr;
}
int count = this->invisibleRootItem()->rowCount();
for (int i = 0; i < count; ++i)
{
QStandardItem* child = this->invisibleRootItem()->child(i);
if (!child)
{
continue;
}
QVariant uid = child->data(qMRMLSceneModel::UIDRole);
if (uid.type() == QVariant::String &&
uid.toString() == "scene")
{
return child;
}
}
return nullptr;
}
//------------------------------------------------------------------------------
QModelIndex qMRMLSceneModel::mrmlSceneIndex()const
{
QStandardItem* scene = this->mrmlSceneItem();
if (scene == nullptr)
{
return QModelIndex();
}
return scene ? scene->index() : QModelIndex();
}
//------------------------------------------------------------------------------
vtkMRMLNode* qMRMLSceneModel::mrmlNodeFromItem(QStandardItem* nodeItem)const
{
Q_D(const qMRMLSceneModel);
// TODO: fasten by saving the pointer into the data
if (d->MRMLScene == nullptr || nodeItem == nullptr)
{
return nullptr;
}
QVariant nodePointer = nodeItem->data(qMRMLSceneModel::PointerRole);
if (!nodePointer.isValid() || nodeItem->data(qMRMLSceneModel::UIDRole).toString() == "scene")
{
return nullptr;
}
return nodeItem ? d->MRMLScene->GetNodeByID(
nodeItem->data(qMRMLSceneModel::UIDRole).toString().toUtf8()) : nullptr;
}
//------------------------------------------------------------------------------
QStandardItem* qMRMLSceneModel::itemFromNode(vtkMRMLNode* node, int column)const
{
QModelIndex nodeIndex = this->indexFromNode(node, column);
QStandardItem* nodeItem = this->itemFromIndex(nodeIndex);
return nodeItem;
}
//------------------------------------------------------------------------------
QModelIndex qMRMLSceneModel::indexFromNode(vtkMRMLNode* node, int column)const
{
Q_D(const qMRMLSceneModel);
if (node == nullptr || node->GetID() == nullptr )
{
return QModelIndex();
}
QModelIndex nodeIndex;
// Try to find the nodeIndex in the cache first
QMap<vtkMRMLNode*,QPersistentModelIndex>::iterator rowCacheIt=d->RowCache.find(node);
if (rowCacheIt==d->RowCache.end())
{
// not found in cache, therefore it cannot be in the model
return nodeIndex;
}
if (rowCacheIt.value().isValid())
{
// An entry found in the cache. If the item at the cached index matches the requested node ID
// then we use it.
QStandardItem* nodeItem = this->itemFromIndex(rowCacheIt.value());
if (nodeItem!=nullptr)
{
if (nodeItem->data(qMRMLSceneModel::UIDRole).toString().compare(QString::fromUtf8(node->GetID()))==0)
{
// id matched
nodeIndex=rowCacheIt.value();
}
}
}
// The cache was not up-to-date. Do a slow linear search.
if (!nodeIndex.isValid())
{
// QAbstractItemModel::match doesn't browse through columns
// we need to do it manually
QModelIndexList nodeIndexes = this->match(
this->mrmlSceneIndex(), qMRMLSceneModel::UIDRole, QString(node->GetID()),
1, Qt::MatchExactly | Qt::MatchRecursive);
Q_ASSERT(nodeIndexes.size() <= 1); // we know for sure it won't be more than 1
if (nodeIndexes.size() == 0)
{
// maybe the node hasn't been added to the scene yet...
// (if it's called from populateScene/inserteNode)
d->RowCache.remove(node);
return QModelIndex();
}
nodeIndex=nodeIndexes[0];
d->RowCache[node]=nodeIndex;
}
if (column == 0)
{
// QAbstractItemModel::match only search through the first column
// (because scene is in the first column)
Q_ASSERT(nodeIndex.isValid());
return nodeIndex;
}
// Add the QModelIndexes from the other columns
const int row = nodeIndex.row();
QModelIndex nodeParentIndex = nodeIndex.parent();
Q_ASSERT( column < this->columnCount(nodeParentIndex) );
return ctk::modelChildIndex(const_cast<qMRMLSceneModel*>(this), nodeParentIndex, row, column);
}
//------------------------------------------------------------------------------
QModelIndexList qMRMLSceneModel::indexes(vtkMRMLNode* node)const
{
Q_D(const qMRMLSceneModel);
return d->indexes(QString(node->GetID()));
}
//------------------------------------------------------------------------------
vtkMRMLNode* qMRMLSceneModel::parentNode(vtkMRMLNode* node)const
{
Q_UNUSED(node);
return nullptr;
}
//------------------------------------------------------------------------------
int qMRMLSceneModel::nodeIndex(vtkMRMLNode* node)const
{
Q_D(const qMRMLSceneModel);
if (!d->MRMLScene)
{
return -1;
}
const char* nodeId = node ? node->GetID() : nullptr;
if (nodeId == nullptr)
{
return -1;
}
const char* nId = nullptr;
int index = -1;
vtkMRMLNode* parent = this->parentNode(node);
// Iterate through the scene and see if there is any matching node.
// First try to find based on ptr value, as it's much faster than comparing string IDs.
vtkCollection* nodes = d->MRMLScene->GetNodes();
vtkMRMLNode* n = nullptr;
vtkCollectionSimpleIterator it;
for (nodes->InitTraversal(it);
(n = (vtkMRMLNode*)(nodes->GetNextItemAsObject(it))) ;)
{
// note: parent can be nullptr, it means that the scene is the parent
if (parent == this->parentNode(n))
{
++index;
if (node==n)
{
// found the node
return index;
}
}
}
// Not found by node ptr, try to find it by ID (much slower)
for (nodes->InitTraversal(it);
(n = (vtkMRMLNode*)nodes->GetNextItemAsObject(it)) ;)
{
// note: parent can be nullptr, it means that the scene is the parent
if (parent == this->parentNode(n))
{
++index;
nId = n->GetID();
if (nId && !strcmp(nodeId, nId))
{
return index;
}
}
}
// Not found
return -1;
}
//------------------------------------------------------------------------------
bool qMRMLSceneModel::canBeAChild(vtkMRMLNode* node)const
{
Q_UNUSED(node);
return false;
}
//------------------------------------------------------------------------------
bool qMRMLSceneModel::canBeAParent(vtkMRMLNode* node)const
{
Q_UNUSED(node);
return false;
}
//------------------------------------------------------------------------------
bool qMRMLSceneModel::reparent(vtkMRMLNode* node, vtkMRMLNode* newParent)
{
Q_UNUSED(node);
Q_UNUSED(newParent);
return false;
}
//------------------------------------------------------------------------------
bool qMRMLSceneModel::isParentNode(vtkMRMLNode* child, vtkMRMLNode* parent)const
{
for (; child; child = this->parentNode(child))
{
if (child == parent)
{
return true;
}
}
return false;
}
//------------------------------------------------------------------------------
bool qMRMLSceneModel
::isAffiliatedNode(vtkMRMLNode* nodeA, vtkMRMLNode* nodeB)const
{
return this->isParentNode(nodeA, nodeB) || this->isParentNode(nodeB, nodeA);
}
//------------------------------------------------------------------------------
void qMRMLSceneModel::setListenNodeModifiedEvent(qMRMLSceneModel::NodeTypes listen)
{
Q_D(qMRMLSceneModel);
if (d->ListenNodeModifiedEvent == listen)
{
return;
}
d->ListenNodeModifiedEvent = listen;
d->listenNodeModifiedEvent();
}
//------------------------------------------------------------------------------
qMRMLSceneModel::NodeTypes qMRMLSceneModel::listenNodeModifiedEvent()const
{
Q_D(const qMRMLSceneModel);
return d->ListenNodeModifiedEvent;
}
//------------------------------------------------------------------------------
void qMRMLSceneModel::setLazyUpdate(bool lazy)
{
Q_D(qMRMLSceneModel);
if (d->LazyUpdate == lazy)
{
return;
}
d->LazyUpdate = lazy;
}
//------------------------------------------------------------------------------
bool qMRMLSceneModel::lazyUpdate()const
{
Q_D(const qMRMLSceneModel);
return d->LazyUpdate;
}
//------------------------------------------------------------------------------
QMimeData* qMRMLSceneModel::mimeData(const QModelIndexList& indexes)const
{
Q_D(const qMRMLSceneModel);
if (!indexes.size())
{
return nullptr;
}
QModelIndexList allColumnsIndexes;
foreach(const QModelIndex& index, indexes)
{
QModelIndex parent = index.parent();
for (int column = 0; column < this->columnCount(parent); ++column)
{
allColumnsIndexes << this->index(index.row(), column, parent);
}
d->DraggedNodes << this->mrmlNodeFromIndex(index);
}
// Remove duplicates
#if (QT_VERSION >= QT_VERSION_CHECK(5, 14, 0))
allColumnsIndexes = QSet<QModelIndex>(allColumnsIndexes.begin(), allColumnsIndexes.end()).values();
#else
allColumnsIndexes = allColumnsIndexes.toSet().values();
#endif
return this->QStandardItemModel::mimeData(allColumnsIndexes);
}
//------------------------------------------------------------------------------
bool qMRMLSceneModel::dropMimeData(const QMimeData *data, Qt::DropAction action,
int row, int column, const QModelIndex &parent)
{
Q_UNUSED(column);
// We want to do drag&drop only into the first item of a line (and not on a
// random column.
bool res = this->Superclass::dropMimeData(
data, action, row, 0, parent.sibling(parent.row(), 0));
// Do not clear d->DraggedNodes yet, as node modification events may come
// in before delayedItemChanged() is executed.
return res;
}
//------------------------------------------------------------------------------
void qMRMLSceneModel::updateScene()
{
Q_D(qMRMLSceneModel);
// Stop listening to all the nodes before we remove them (setRowCount) as some
// weird behavior could arise when removing the nodes (e.g onMRMLNodeModified
// could be called ...)
qvtkDisconnect(nullptr, vtkCommand::ModifiedEvent,
this, SLOT(onMRMLNodeModified(vtkObject*)));
qvtkDisconnect(nullptr, vtkMRMLNode::IDChangedEvent,
this, SLOT(onMRMLNodeIDChanged(vtkObject*,void*)));
d->RowCache.clear();
// Enabled so it can be interacted with
this->invisibleRootItem()->setFlags(Qt::ItemIsEnabled);
// Extra items before the scene item. Typically there is no top-level extra
// items, only at the Scene level (before and after the nodes)
const int preSceneItemCount = this->preItems(nullptr).count();
const int postSceneItemCount = this->postItems(nullptr).count();
if (!this->mrmlSceneItem() && d->MRMLScene)
{
// No scene item has been created yet, but the MRMLScene is valid so we
// need to create one.
QList<QStandardItem*> sceneItems;
QStandardItem* sceneItem = new QStandardItem;
sceneItem->setFlags(Qt::ItemIsDropEnabled | Qt::ItemIsEnabled);
sceneItem->setText("Scene");
sceneItem->setData("scene", qMRMLSceneModel::UIDRole);
sceneItems << sceneItem;
for (int i = 1; i < this->columnCount(); ++i)
{
QStandardItem* sceneOtherColumn = new QStandardItem;
sceneOtherColumn->setFlags(Qt::NoItemFlags);
sceneItems << sceneOtherColumn;
}
// We need to set the column count in case there extra items,
// they need to know how many columns the scene item has.
sceneItem->setColumnCount(this->columnCount());
this->insertRow(preSceneItemCount, sceneItems);
}
else if (!d->MRMLScene)
{
// TBD: Because we don't call clear, I don't think restoring the column
// count is necessary because it shouldn't be changed.
const int oldColumnCount = this->columnCount();
this->removeRows(
preSceneItemCount,
this->rowCount() - preSceneItemCount - postSceneItemCount);
this->setColumnCount(oldColumnCount);
return;
}
// if there is no column, there is no scene item.
if (!this->mrmlSceneItem())
{
return;
}
// Update the scene pointer in case d->MRMLScene has changed
this->mrmlSceneItem()->setData(
QVariant::fromValue(reinterpret_cast<long long>(d->MRMLScene.GetPointer())),
qMRMLSceneModel::PointerRole);
const int preNodesItemCount = this->preItems(this->mrmlSceneItem()).count();
const int postNodesItemCount = this->postItems(this->mrmlSceneItem()).count();
// Just remove the nodes, not the extra items like "None", "Create node" etc.
this->mrmlSceneItem()->removeRows(
preNodesItemCount,
this->mrmlSceneItem()->rowCount() - preNodesItemCount - postNodesItemCount);
// Populate scene with nodes
this->populateScene();
}
//------------------------------------------------------------------------------
void qMRMLSceneModel::populateScene()
{
Q_D(qMRMLSceneModel);
// Add nodes
int index = -1;
vtkMRMLNode *node = nullptr;
vtkCollectionSimpleIterator it;
d->MisplacedNodes.clear();
if (!d->MRMLScene)
{
return;
}
for (d->MRMLScene->GetNodes()->InitTraversal(it);
(node = (vtkMRMLNode*)d->MRMLScene->GetNodes()->GetNextItemAsObject(it)) ;)
{
index++;
d->insertNode(node, index);
}
foreach(vtkMRMLNode* misplacedNode, d->MisplacedNodes)
{
this->onMRMLNodeModified(misplacedNode);
}
}
//------------------------------------------------------------------------------
QStandardItem* qMRMLSceneModel::insertNode(vtkMRMLNode* node)
{
Q_D(qMRMLSceneModel);
return d->insertNode(node, this->nodeIndex(node));
}
//------------------------------------------------------------------------------
QStandardItem* qMRMLSceneModelPrivate::insertNode(vtkMRMLNode* node, int nodeIndex)
{
Q_Q(qMRMLSceneModel);
QStandardItem* nodeItem = q->itemFromNode(node);
if (nodeItem != nullptr)
{
// It is possible that the node has been already added if it is the parent
// of a child node already inserted.
return nodeItem;
}
vtkMRMLNode* parentNode = q->parentNode(node);
QStandardItem* parentItem =
parentNode ? q->itemFromNode(parentNode) : q->mrmlSceneItem();
if (!parentItem)
{
Q_ASSERT(parentNode);
parentItem = q->insertNode(parentNode);
Q_ASSERT(parentItem);
}
int min = q->preItems(parentItem).count();
int max = parentItem->rowCount() - q->postItems(parentItem).count();
int row = min + nodeIndex;
if (row > max)
{
this->MisplacedNodes << node;
row = max;
}
nodeItem = q->insertNode(node, parentItem, row);
Q_ASSERT(q->itemFromNode(node) == nodeItem);
return nodeItem;
}
//------------------------------------------------------------------------------
QStandardItem* qMRMLSceneModel::insertNode(vtkMRMLNode* node, QStandardItem* parent, int row)
{
Q_D(qMRMLSceneModel);
Q_ASSERT(vtkMRMLNode::SafeDownCast(node));
QList<QStandardItem*> items;
for (int i= 0; i < this->columnCount(); ++i)
{
QStandardItem* newNodeItem = new QStandardItem();
this->updateItemFromNode(newNodeItem, node, i);
items.append(newNodeItem);
}
// Insert an invalid item in the cache to indicate that the node is in the model
// but we don't know its index yet. This is needed because a custom widget may be notified
// about row insertion before insertRow() returns (and the RowCache entry is added).
// For example, qSlicerPresetComboBox::setIconToPreset() is called at the end of insertRow,
// before the RowCache entry is added.
d->RowCache[node]=QModelIndex();
if (parent)
{
parent->insertRow(row, items);
//Q_ASSERT(parent->columnCount() == 2);
}
else
{
this->insertRow(row,items);
}
d->RowCache[node]=items[0]->index();
// TODO: don't listen to nodes that are hidden from editors ?
if (d->ListenNodeModifiedEvent == AllNodes)
{
this->observeNode(node);
}
return items[0];
}
//------------------------------------------------------------------------------
void qMRMLSceneModel::observeNode(vtkMRMLNode* node)
{
qvtkConnect(node, vtkCommand::ModifiedEvent,
this, SLOT(onMRMLNodeModified(vtkObject*)));
qvtkConnect(node, vtkMRMLNode::IDChangedEvent,
this, SLOT(onMRMLNodeIDChanged(vtkObject*,void*)));
}
//------------------------------------------------------------------------------
void qMRMLSceneModel::updateItemFromNode(QStandardItem* item, vtkMRMLNode* node, int column)
{
Q_D(qMRMLSceneModel);
// We are going to make potentially multiple changes to the item. We want to
// refresh the node only once, so we "block" the updates in onItemChanged().
d->PendingItemModified = 0;
item->setFlags(this->nodeFlags(node, column));
// set UIDRole and set PointerRole need to be atomic
bool blocked = this->blockSignals(true);
item->setData(QString(node->GetID()), qMRMLSceneModel::UIDRole);
item->setData(QVariant::fromValue(reinterpret_cast<long long>(node)), qMRMLSceneModel::PointerRole);
this->blockSignals(blocked);
this->updateItemDataFromNode(item, node, column);
bool itemChanged = (d->PendingItemModified > 0);
d->PendingItemModified = -1;
// Update parent, but only if the item is not being drag-and-dropped
// (drag-and-drop is performed using delayed update, therefore
// any node modifications, even those unrelated to changing the parent
// would override drag-and-drop result).
if (this->canBeAChild(node) && !d->DraggedNodes.contains(node))
{
QStandardItem* parentItem = item->parent();
QStandardItem* newParentItem = this->itemFromNode(this->parentNode(node));
if (newParentItem == nullptr)
{
newParentItem = this->mrmlSceneItem();
}
// If the item has no parent, then it means it hasn't been put into the scene yet.
// and it will do it automatically.
if (parentItem && parentItem != newParentItem)
{
int newIndex = this->nodeIndex(node);
if (parentItem != newParentItem ||
newIndex != item->row())
{
QList<QStandardItem*> children = parentItem->takeRow(item->row());
d->reparentItems(children, newIndex, newParentItem);
}
}
}
if (itemChanged)
{
this->onItemChanged(item);
}
}
//------------------------------------------------------------------------------
QFlags<Qt::ItemFlag> qMRMLSceneModel::nodeFlags(vtkMRMLNode* node, int column)const
{
QFlags<Qt::ItemFlag> flags = Qt::ItemIsEnabled
| Qt::ItemIsSelectable;
if (column == this->checkableColumn() && node->GetSelectable())
{
flags = flags | Qt::ItemIsUserCheckable;
}
if (column == this->nameColumn())
{
flags = flags | Qt::ItemIsEditable;
}
if (this->canBeAChild(node))
{
flags = flags | Qt::ItemIsDragEnabled;
}
if (this->canBeAParent(node))
{
flags = flags | Qt::ItemIsDropEnabled;
}
return flags;
}
//------------------------------------------------------------------------------
void qMRMLSceneModel::updateItemDataFromNode(
QStandardItem* item, vtkMRMLNode* node, int column)
{
Q_D(qMRMLSceneModel);
if (column == this->nameColumn())
{
item->setText(QString(node->GetName()));
item->setToolTip(node->GetNodeTagName());
}
if (column == this->toolTipNameColumn())
{
item->setToolTip(QString(node->GetName()));
}
if (column == this->idColumn())
{
item->setText(QString(node->GetID()));
}
if (column == this->checkableColumn())
{
item->setCheckState(node->GetSelected() ? Qt::Checked : Qt::Unchecked);
}
if (column == this->visibilityColumn())
{
vtkMRMLDisplayNode* displayNode = vtkMRMLDisplayNode::SafeDownCast(node);
vtkMRMLDisplayableNode* displayableNode =
vtkMRMLDisplayableNode::SafeDownCast(node);
vtkMRMLDisplayableHierarchyNode* displayableHierarchyNode =
vtkMRMLDisplayableHierarchyNode::SafeDownCast(node);
if (displayableHierarchyNode)