// TnzCore includes

#include "tundo.h"

// TnzExt includes

#include "ext/plasticdeformerstorage.h"

// TnzLib includes

#include "toonz/txshcell.h"

#include "toonz/txshsimplelevel.h"

#include "toonz/txsheethandle.h"

#include "toonz/stage.h"

// tcg includes

#include "tcg/tcg_point_ops.h"

#include "tcg/tcg_algorithm.h"

#include "tcg/tcg_function_types.h"

#include "tcg/tcg_iterator_ops.h"

#include "plastictool.h"

using namespace PlasticToolLocals;

//****************************************************************************************

//    Local namespace  stuff

//****************************************************************************************

namespace {

TPointD closestMeshVertexPos(const TPointD &pos, double *distance = 0) {

  const TXshCell &imageCell = TTool::getImageCell();

  TXshSimpleLevel *sl = imageCell.getSimpleLevel();

  assert(sl);

  TMeshImageP mi(TTool::getImage(false));

  assert(mi);

  // Retrieve *level* dpi

  // NOTE: This is different than current IMAGE's dpi. An image is actually

  // displayed with

  //       its level owner's dpi, RATHER than its own.

  const TPointD &dpi = sl->getDpi(imageCell.getFrameId());

  assert(dpi.x > 0.0 && dpi.y > 0.0);

  // Cast pos to image coordinates

  const TPointD pos_mesh(pos.x * (dpi.x / Stage::inch),

                         pos.y * (dpi.y / Stage::inch));

  // Retrieve the closest vertex to pos_mesh

  const std::pair<double, plastictool::meshindex=""> &closest =</double,>

      PlasticToolLocals::closestVertex(*mi, pos_mesh);

  const TPointD &vxPos_mesh =

      mi->meshes()[closest.second.m_meshIdx]->vertex(closest.second.m_idx).P();

  if (distance)

    *distance =

        std::min(Stage::inch / dpi.x, Stage::inch / dpi.y) * closest.first;

  // Cast it back to world coordinates

  return TPointD(vxPos_mesh.x * (Stage::inch / dpi.x),

                 vxPos_mesh.y * (Stage::inch / dpi.y));

}

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

TPointD closestSkeletonVertexPos(const TPointD &pos) {

  struct locals {

    static inline double dist2(const TPointD &pos,

                               const PlasticSkeletonVertex &vx) {

      return tcg::point_ops::dist2(pos, vx.P());

    }

  };

  const PlasticSkeletonP &skeleton = l_plasticTool.skeleton();

  if (!skeleton || skeleton->empty()) return TConsts::napd;

  const PlasticSkeleton::vertices_container &vertices = skeleton->vertices();

  return tcg::min_transform(vertices.begin(), vertices.end(),

                            tcg::bind1st(&locals::dist2, pos))

      ->P();

}

}  // namespace

//****************************************************************************************

//    Undo  definitions

//****************************************************************************************

namespace {

class VertexUndo : public TUndo {

protected:

  int m_row, m_col;  //!< Xsheet coordinates

  int m_v, m_vParent;          //!< Indices of the added vertex and its parent

  PlasticSkeletonVertex m_vx;  //!< Added vertex

  std::vector<int> m_children;  //!< Children of the vertex to insert</int>

public:

  VertexUndo() : m_row(::row()), m_col(::column()), m_v(-1), m_vParent(-1) {}

  int getSize() const override {

    return sizeof(*this);

  }  // sizeof this is roughly ok

  void storeChildren(const PlasticSkeleton &skeleton,

                     const PlasticSkeletonVertex &vx) {

    m_children.clear();

    // Traverse vx's edges and build its children table

    PlasticSkeletonVertex::edges_const_iterator et, eEnd(vx.edgesEnd());

    for (et = vx.edgesBegin(); et != eEnd; ++et) {

      int vChild = skeleton.edge(*et).vertex(1);

      if (vChild == vx.getIndex()) continue;

      m_children.push_back(vChild);

    }

  }

  void addVertex() {

    assert(m_vx.edges().empty());

    // Load the right skeleton by moving to the stored xsheet pos

    PlasticTool::TemporaryActivation tempActivate(m_row, m_col);

    const PlasticSkeletonP &skeleton = l_plasticTool.skeleton();

    TCG_ASSERT(skeleton || m_vParent < 0, return );

    // Perform addition

    l_plasticTool.setSkeletonSelection(m_vParent);

    l_plasticTool.addVertex(m_vx);

    // Store data to invert the operation

    assert(l_plasticTool.skeletonVertexSelection().hasSingleObject());

    m_v = l_plasticTool.skeletonVertexSelection();

  }

  void insertVertex() {

    if (m_children.empty()) {

      addVertex();

      return;

    }

    assert(m_vx.edges().empty());

    TCG_ASSERT(m_vParent >= 0, return );

    PlasticTool::TemporaryActivation tempActivate(m_row, m_col);

    const PlasticSkeletonP &skeleton = l_plasticTool.skeleton();

    TCG_ASSERT(skeleton, return );

    // Perform insertion

    l_plasticTool.insertVertex(m_vx, m_vParent, m_children);

    // Store data to invert the operation

    assert(l_plasticTool.skeletonVertexSelection().hasSingleObject());

    m_v = l_plasticTool.skeletonVertexSelection();

  }

  void removeVertex() {

    TCG_ASSERT(m_v >= 0, return );

    PlasticTool::TemporaryActivation tempActivate(m_row, m_col);

    const PlasticSkeletonP &skeleton = l_plasticTool.skeleton();

    TCG_ASSERT(skeleton, return );

    // Store data to invert the operation

    {

      const PlasticSkeletonVertex &vx = skeleton->vertex(m_v);

      m_vParent = vx.parent();

      m_vx      = PlasticSkeletonVertex(vx.P());

      storeChildren(*skeleton, vx);

    }

    // Perform removal

    if (m_v > 0) {

      l_plasticTool.setSkeletonSelection(m_v);

      l_plasticTool.removeVertex();

    } else

      l_plasticTool.removeSkeleton(::skeletonId());

  }

};

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

class AddVertexUndo final : public VertexUndo {

public:

  AddVertexUndo(int vParent, const PlasticSkeletonVertex &vx) {

    m_vParent = vParent, m_vx = vx;

    assert(m_vx.edges().empty());

  }

  void redo() const override {

    const_cast<addvertexundo &="">(*this).VertexUndo::addVertex();</addvertexundo>

  }

  void undo() const override {

    const_cast<addvertexundo &="">(*this).VertexUndo::removeVertex();</addvertexundo>

  }

};

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

class RemoveVertexUndo final : public VertexUndo {

public:

  RemoveVertexUndo(int v) {

    assert(v >= 0);

    m_v = v;

  }

  void redo() const override {

    const_cast<removevertexundo &="">(*this).VertexUndo::removeVertex();</removevertexundo>

  }

  void undo() const override {

    const_cast<removevertexundo &="">(*this).VertexUndo::insertVertex();</removevertexundo>

  }

};

//========================================================================

class InsertVertexUndo final : public VertexUndo {

public:

  InsertVertexUndo(int e, const PlasticSkeletonVertex &vx) {

    const PlasticSkeleton &skeleton      = *l_plasticTool.skeleton();

    const PlasticSkeleton::edge_type &ed = skeleton.edge(e);

    m_vParent = ed.vertex(0), m_vx = vx;

    std::vector<int>(1, ed.vertex(1)).swap(m_children);</int>

  }

  void redo() const override {

    const_cast<insertvertexundo &="">(*this).VertexUndo::insertVertex();</insertvertexundo>

  }

  void undo() const override {

    TCG_ASSERT(!m_children.empty(), return );

    const_cast<insertvertexundo &="">(*this).VertexUndo::removeVertex();</insertvertexundo>

  }

};

//========================================================================

class AddSkeletonUndo : public TUndo {

protected:

  int m_row, m_col;  //!< Xsheet coordinates

  int m_skelId;                 //!< The added skeleton's id

  PlasticSkeletonP m_skeleton;  //!< A COPY of the added skeleton

public:

  AddSkeletonUndo(int skelId, const PlasticSkeletonP &skeletonCopy)

      : m_row(::row())

      , m_col(::column())

      , m_skelId(skelId)

      , m_skeleton(skeletonCopy) {}

  // This is not correct... it's tough to build the right one! We're like

  // storing the whole

  // cleared deformation! So, I guess 1 MB (100 of these in the standard undos

  // pool)

  // is a reasonable estimate...

  int getSize() const override { return 1 << 20; }

  void redo() const override {

    PlasticTool::TemporaryActivation tempActivate(m_row, m_col);

    l_plasticTool.addSkeleton(m_skelId, new PlasticSkeleton(*m_skeleton));

    ::invalidateXsheet();

  }

  void undo() const override {

    PlasticTool::TemporaryActivation tempActivate(m_row, m_col);

    l_plasticTool.removeSkeleton(m_skelId);

  }

};

//========================================================================

class RemoveSkeletonUndo : public AddSkeletonUndo {

public:

  RemoveSkeletonUndo(int skelId)

      : AddSkeletonUndo(skelId, l_plasticTool.skeleton()) {}

  void redo() const override { AddSkeletonUndo::undo(); }

  void undo() const override { AddSkeletonUndo::redo(); }

};

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

class RemoveSkeletonUndo_WithKeyframes final : public RemoveSkeletonUndo {

  mutable std::vector<tdoublekeyframe></tdoublekeyframe>

      m_skelIdsKeyframes;  //!< Skeleton Ids param curve keyframes

                           //!< for m_skelId

public:

  RemoveSkeletonUndo_WithKeyframes(int skelId) : RemoveSkeletonUndo(skelId) {}

  void redo() const override {

    // Erase all keyframes corresponding to m_skelId from sd's skeleton ids

    // curve

    const SkDP &sd = l_plasticTool.deformation();

    TCG_ASSERT(sd, return );

    const TDoubleParamP &skelIdsParam = sd->skeletonIdsParam();

    if (skelIdsParam->getKeyframeCount() > 0) {

      double frame;

      for (int k = 0; k >= 0; k = skelIdsParam->getNextKeyframe(frame)) {

        const TDoubleKeyframe &kf = skelIdsParam->getKeyframe(k);

        frame                     = kf.m_frame;

        if (m_skelId == (int)kf.m_value) {

          m_skelIdsKeyframes.push_back(kf);

          skelIdsParam->deleteKeyframe(frame);

        }

      }

    }

    RemoveSkeletonUndo::redo();  // Invalidates the xsheet

  }

  void undo() const override {

    l_plasticTool

        .touchDeformation();  // Skeleton removal could have destroyed the sd

    // Restore saved keyframes to sd's skelIdsParam curve

    const SkDP &sd = l_plasticTool.deformation();

    assert(sd);

    const TDoubleParamP &skelIdsParam = sd->skeletonIdsParam();

    std::vector<tdoublekeyframe>::iterator kt, kEnd(m_skelIdsKeyframes.end());</tdoublekeyframe>

    for (kt = m_skelIdsKeyframes.begin(); kt != kEnd; ++kt)

      skelIdsParam->setKeyframe(*kt);

    m_skelIdsKeyframes.clear();

    RemoveSkeletonUndo::undo();  // Invalidates the xsheet

  }

};

//========================================================================

class SetSkeletonIdUndo final : public TUndo {

  int m_row, m_col;  //!< Xsheet coordinates

  int m_skelId;  //!< The new skeleton id value

  mutable TDoubleKeyframe

      m_oldKf;  //!< Old keyframe values for skelIds parameter

  mutable bool m_added1stKeyframe;  //!< Whether the redo() added the first

                                    //! skelIds keyframe

public:

  SetSkeletonIdUndo(int skelId)

      : m_row(::row()), m_col(::column()), m_skelId(skelId) {}

  int getSize() const override { return sizeof(*this); }

  void redo() const override {

    PlasticTool::TemporaryActivation tempActivate(m_row, m_col);

    const SkDP &sd = l_plasticTool.deformation();

    TCG_ASSERT(sd, return );

    const TDoubleParamP &skelIdsParam = sd->skeletonIdsParam();

    double frame                      = ::frame();

    m_oldKf            = skelIdsParam->getKeyframeAt(frame);

    m_added1stKeyframe = false;

    if (frame > 0.0 && (skelIdsParam->getKeyframeCount() == 0 ||

                        skelIdsParam->getKeyframe(0).m_frame >= frame)) {

      // Put a keyframe at the previous cell to preserve values before current

      // frame

      TDoubleKeyframe kf(frame - 1.0, skelIdsParam->getDefaultValue());

      kf.m_type = TDoubleKeyframe::Constant;

      skelIdsParam->setKeyframe(kf);

      m_added1stKeyframe = true;

    }

    TDoubleKeyframe kf(frame, m_skelId);

    kf.m_type = TDoubleKeyframe::Constant;

    skelIdsParam->setKeyframe(kf);

    // No need to invoke PlasticTool::storeSkeletonId() - automatic through

    // onChange()

  }

  void undo() const override {

    PlasticTool::TemporaryActivation tempActivate(m_row, m_col);

    const SkDP &sd = l_plasticTool.deformation();

    TCG_ASSERT(sd, return );

    const TDoubleParamP &skelIdsParam = sd->skeletonIdsParam();

    if (m_oldKf.m_isKeyframe)

      skelIdsParam->setKeyframe(m_oldKf);

    else

      skelIdsParam->deleteKeyframe(m_oldKf.m_frame);

    if (m_added1stKeyframe) {

      const TDoubleKeyframe &kf = skelIdsParam->getKeyframe(0);

      assert(kf.m_value == skelIdsParam->getDefaultValue());

      if (kf.m_value == skelIdsParam->getDefaultValue())

        skelIdsParam->deleteKeyframe(kf.m_frame);

    }

  }

};

//========================================================================

class MoveVertexUndo_Build final : public TUndo {

  int m_row, m_col;  //!< Xsheet coordinates

  std::vector<int> m_vIdxs;           //!< Moved vertices</int>

  std::vector<tpointd> m_origVxsPos;  //!< Original vertex positions</tpointd>

  TPointD m_posShift;                 //!< Vertex positions shift

public:

  MoveVertexUndo_Build(const std::vector<int> &vIdxs,</int>

                       const std::vector<tpointd> &origVxsPos,</tpointd>

                       const TPointD &posShift)

      : m_row(::row())

      , m_col(::column())

      , m_vIdxs(vIdxs)

      , m_origVxsPos(origVxsPos)

      , m_posShift(posShift) {

    assert(m_vIdxs.size() == m_origVxsPos.size());

  }

  int getSize() const override {

    return int(sizeof(*this) +

               m_vIdxs.size() * (sizeof(int) + 2 * sizeof(TPointD)));

  }

  void redo() const override {

    PlasticTool::TemporaryActivation tempActivate(m_row, m_col);

    l_plasticTool.setSkeletonSelection(m_vIdxs);

    l_plasticTool.moveVertex_build(m_origVxsPos, m_posShift);

    ::stageObject()

        ->invalidate();  // Should be a TStageObject's implementation detail ...

    l_plasticTool.invalidate();

  }

  void undo() const override {

    PlasticTool::TemporaryActivation tempActivate(m_row, m_col);

    l_plasticTool.setSkeletonSelection(m_vIdxs);

    l_plasticTool.moveVertex_build(m_origVxsPos, TPointD());

    ::stageObject()

        ->invalidate();  // Should be a TStageObject's implementation detail ...

    l_plasticTool.invalidate();

  }

};

}  // namespace

//****************************************************************************************

//    PlasticTool  functions

//****************************************************************************************

void PlasticTool::mouseMove_build(const TPointD &pos, const TMouseEvent &me) {

  // Track mouse position

  m_pos = pos;  // Needs to be done now - ensures m_pos is valid

  m_svHigh = m_seHigh = -1;  // Reset highlighted primitives

  double d, highlightRadius = getPixelSize() * HIGHLIGHT_DISTANCE;

  const PlasticSkeletonP &skeleton = this->skeleton();

  if (skeleton) {

    // Search nearest skeleton entities

    // Look for nearest vertex

    int v = skeleton->closestVertex(pos, &d);

    if (v >= 0 && d < highlightRadius)

      m_svHigh = v;

    else {

      // Look for nearest edge

      int e = skeleton->closestEdge(pos, &d);

      if (e >= 0 && d < highlightRadius) m_seHigh = e;

    }

  }

  if (m_svHigh < 0 && m_seHigh < 0) {

    // No highlighted skeleton primitive. Mouse position may be

    // a candidate for vertex addition - snap to mesh if required

    if (m_snapToMesh.getValue()) {

      const TPointD &mvPos = ::closestMeshVertexPos(

          pos, &d);  // No need to check against closest skeleton vertex,

                     // since vertex highlighting kicks in at the same time

      if (d < highlightRadius)  // the snapping would take place.

        m_pos = mvPos;

    }

  }

  invalidate();

}

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

void PlasticTool::leftButtonDown_build(const TPointD &pos,

                                       const TMouseEvent &me) {

  // Track mouse position

  m_pressedPos = m_pos = pos;

  // Update selections

  {

    const PlasticSkeletonP &skel = skeleton();

    if (m_svHigh >= 0) {

      PlasticVertexSelection vSel(

          me.isShiftPressed()

              ? PlasticVertexSelection(branchSelection(m_svHigh))

              : PlasticVertexSelection(m_svHigh));

      if (me.isCtrlPressed())

        toggleSkeletonSelection(vSel);

      else if (!m_svSel.contains(vSel))

        setSkeletonSelection(vSel);

    } else if (m_seHigh >= 0) {

      // Insert a vertex in the edge

      TUndo *op = new InsertVertexUndo(

          m_seHigh, PlasticSkeletonVertex(projection(*skel, m_seHigh, m_pos)));

      TUndoManager::manager()->add(op);

      op->redo();

    } else if (!skel || skel->empty() || m_svSel.hasSingleObject()) {

      // Snap to mesh if required

      if (m_snapToMesh.getValue()) {

        double d, highlightRadius = getPixelSize() * HIGHLIGHT_DISTANCE;

        const TPointD &mvPos = ::closestMeshVertexPos(

            pos, &d);  // Again, no need to check against closest

                       // skeleton vertex.

        if (d < highlightRadius) m_pos = mvPos;

      }

      // Add a new vertex

      TUndo *op = new AddVertexUndo(m_svSel, PlasticSkeletonVertex(m_pos));

      TUndoManager::manager()->add(op);

      op->redo();

      assert(skeleton());

    } else

      setSkeletonSelection(-1);

  }

  // Start move vertex operation

  if (!m_svSel.isEmpty()) {

    struct locals {

      static TPointD vertexPos(const PlasticSkeleton &skel, int v) {

        return skel.vertex(v).P();

      }

    };

    const PlasticSkeletonP &skel = skeleton();

    assert(skel);

    // Adjust mouse press to the selected skeleton vertex, if necessary

    if (m_svSel.hasSingleObject()) m_pressedPos = skel->vertex(m_svSel).P();

    // Store original vertex positions

    m_pressedVxsPos = std::vector<tpointd>(</tpointd>

        tcg::make_cast_it(m_svSel.objects().begin(),

                          tcg::bind1st(&locals::vertexPos, *skel)),

        tcg::make_cast_it(m_svSel.objects().end(),

                          tcg::bind1st(&locals::vertexPos, *skel)));

  }

  invalidate();

}

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

void PlasticTool::leftButtonDrag_build(const TPointD &pos,

                                       const TMouseEvent &me) {

  // Track mouse position

  if (m_snapToMesh.getValue()) {

    const TPointD &mvPos = ::closestMeshVertexPos(pos),

                  &svPos = ::closestSkeletonVertexPos(mvPos);

    if (tcg::point_ops::dist(mvPos, svPos) >

        getPixelSize())  // 1) If said distance is sub-pixel, the user

      m_pos = mvPos;  //    just cannot see the assignment - so it's not safe.

  }                   // 2) The moveVertex_build() below manipulates m_pos

  else                //    (not how m_pressedPos is subtracted), so !=

    m_pos = pos;      //    is not a choice.

  moveVertex_build(m_pressedVxsPos, m_pos - m_pressedPos);

  invalidate();

}

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

void PlasticTool::leftButtonUp_build(const TPointD &pos,

                                     const TMouseEvent &me) {

  // Track mouse position

  if (m_snapToMesh.getValue()) {

    const TPointD &mvPos = ::closestMeshVertexPos(pos),

                  &svPos = ::closestSkeletonVertexPos(mvPos);

    if (tcg::point_ops::dist(mvPos, svPos) > getPixelSize())  // Same as above

      m_pos = mvPos;

  } else

    m_pos = pos;

  if (!m_svSel.isEmpty() && m_dragged) {

    TUndoManager::manager()->add(new MoveVertexUndo_Build(

        m_svSel.objects(), m_pressedVxsPos, m_pos - m_pressedPos));

    ::stageObject()

        ->invalidate();  // Should be a TStageObject's implementation detail ...

    invalidate();        // .. it's that it caches placement data and we must

  }                      // invalidate it. Gross. Can't we do anything about it?

}

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

void PlasticTool::addContextMenuActions_build(QMenu *menu) {

  bool ret = true;

  if (!m_svSel.isEmpty()) {

    QAction *deleteVertex = menu->addAction(tr("Delete Vertex"));

    ret = ret && connect(deleteVertex, SIGNAL(triggered()), &l_plasticTool,

                         SLOT(deleteSelectedVertex_undo()));

    menu->addSeparator();

  }

  assert(ret);

}

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

void PlasticTool::moveVertex_build(const std::vector<tpointd> &origVxsPos,</tpointd>

                                   const TPointD &posShift) {

  if (!m_svSel.isEmpty()) {

    const PlasticSkeletonP &skeleton = this->skeleton();

    // Move selected vertices

    int v, vCount = int(m_svSel.objects().size());

    for (v = 0; v != vCount; ++v)

      skeleton->moveVertex(m_svSel.objects()[v], origVxsPos[v] + posShift);

    // Deformation must be recompiled

    PlasticDeformerStorage::instance()->invalidateSkeleton(

        m_sd.getPointer(), ::skeletonId(), PlasticDeformerStorage::ALL);

    if (m_mode.getIndex() == ANIMATE_IDX)

      storeDeformation();  // Rebuild deformed skeleton - default values have

                           // changed

  }

}

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

void PlasticTool::addVertex(const PlasticSkeletonVertex &vx) {

  touchSkeleton();

  const PlasticSkeletonP &skeleton = this->skeleton();

  l_suspendParamsObservation =

      true;  // Some vertex parameters change during insert

  assert(

      m_svSel.isEmpty() ||

      m_svSel

          .hasSingleObject());  // Could there be no parent (inserting the root)

  setSkeletonSelection(skeleton->addVertex(vx, m_svSel));

  l_suspendParamsObservation = false;

  onChange();  // Update once after add

  // NOTE: Root addition does NOT currently add channels, so the above

  // onChange() is

  // quite necessary to cover that case too!

  // Xsheet change notification is necessary to inform the Function Editor that

  // new

  // channels (the vertex deformation ones) have been introduced

  TTool::getApplication()->getCurrentXsheet()->notifyXsheetChanged();

  PlasticDeformerStorage::instance()->invalidateSkeleton(

      m_sd.getPointer(), ::skeletonId(), PlasticDeformerStorage::ALL);

}

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

void PlasticTool::insertVertex(const PlasticSkeletonVertex &vx, int parent,

                               const std::vector<int> &children) {</int>

  const PlasticSkeletonP &skeleton = this->skeleton();

  assert(skeleton);

  l_suspendParamsObservation =

      true;  // Some vertex parameters change during insert.

  setSkeletonSelection(skeleton->insertVertex(vx, parent, children));

  l_suspendParamsObservation = false;

  onChange();  // Update once after insertion

  TTool::getApplication()->getCurrentXsheet()->notifyXsheetChanged();

  PlasticDeformerStorage::instance()->invalidateSkeleton(

      m_sd.getPointer(), ::skeletonId(), PlasticDeformerStorage::ALL);

}

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

void PlasticTool::insertVertex(const PlasticSkeletonVertex &vx, int e) {

  const PlasticSkeletonP &skeleton = this->skeleton();

  assert(skeleton);

  const PlasticSkeleton::edge_type &ed = skeleton->edge(e);

  insertVertex(vx, ed.vertex(0),

               std::vector<int>(1, skeleton->edge(e).vertex(1)));</int>

}

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

void PlasticTool::removeVertex() {

  const PlasticSkeletonP &skeleton = this->skeleton();

  assert(skeleton && m_svSel.hasSingleObject() && m_svSel > 0);

  l_suspendParamsObservation =

      true;  // Some vertex parameters change during removal.

             // We need to avoid updating WHILE removing.

  skeleton->removeVertex(m_svSel);

  PlasticDeformerStorage::instance()->invalidateSkeleton(

      m_sd.getPointer(), ::skeletonId(), PlasticDeformerStorage::ALL);

  l_suspendParamsObservation = false;

  onChange();

  clearSkeletonSelections();  // Remove mesh references - could be

                              // invalidated...

  // Xsheet change notification is necessary to inform the Function Editor that

  // some

  // channels (the vertex deformation ones) have been removed

  TTool::getApplication()

      ->getCurrentXsheet()

      ->notifyXsheetChanged();  // NOTE: This COULD invoke invalidate()...

  // Rebuild the stage object's keyframes table

  stageObject()->updateKeyframes();

}

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

int PlasticTool::addSkeleton(const PlasticSkeletonP &skeleton) {

  assert(TTool::isEnabled());

  touchDeformation();

  int skelId;

  {

    if (m_sd->empty())

      skelId = 1;

    else {

      // Get the first unused skeleton id in m_sd

      SkD::skelId_iterator st, sEnd;

      m_sd->skeletonIds(st, sEnd);

      for (skelId = 1; st != sEnd && skelId == *st; ++skelId, ++st)

        ;

    }

  }

  addSkeleton(skelId, skeleton);

  return skelId;

}

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

void PlasticTool::addSkeleton(int skelId, const PlasticSkeletonP &skeleton) {

  assert(TTool::isEnabled());

  touchDeformation();

  m_sd->attach(skelId, skeleton.getPointer());

  emit skelIdsListChanged();

}

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

void PlasticTool::removeSkeleton(int skelId) {

  // Remove the entire deformation

  clearSkeletonSelections();

  if (m_sd) {

    m_sd->detach(skelId);

    if (m_sd->empty())

      stageObject()->setPlasticSkeletonDeformation(

          PlasticSkeletonDeformationP());

    ::invalidateXsheet();  // Updates m_sd

    emit skelIdsListChanged();

  }

}

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

void PlasticTool::deleteSelectedVertex_undo() {

  if (m_svSel.isEmpty()) return;

  TUndoManager *manager = TUndoManager::manager();

  if (m_svSel.contains(0)) {

    TUndo *op = new RemoveSkeletonUndo(::skeletonId());

    manager->add(op);

    op->redo();

  } else {

    typedef PlasticVertexSelection::objects_container objects_container;

    objects_container vertexIdxs =

        m_svSel.objects();  // Each undo will reset the vertex selection,

                            // so we need a copy

    manager->beginBlock();

    {

      objects_container::const_iterator vit, viEnd = vertexIdxs.end();

      for (vit = vertexIdxs.begin(); vit != viEnd; ++vit) {

        TUndo *op = new RemoveVertexUndo(*vit);

        manager->add(op);

        op->redo();

      }

    }

    manager->endBlock();

  }

}

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

int PlasticTool::addSkeleton_undo(const PlasticSkeletonP &skeleton) {

  int skelId;

  TUndoManager *manager = TUndoManager::manager();

  manager->beginBlock();

  {

    skelId = l_plasticTool.addSkeleton(skeleton);

    assert(l_plasticTool.deformation());

    TUndo *addUndo =

        new AddSkeletonUndo(skelId, new PlasticSkeleton(*skeleton));

    manager->add(addUndo);

    TUndo *setIdUndo = new SetSkeletonIdUndo(skelId);

    manager->add(setIdUndo);

    setIdUndo->redo();

  }

  manager->endBlock();

  ::invalidateXsheet();

  return skelId;

}

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

void PlasticTool::addSkeleton_undo(int skelId,