/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2015 Jean-Pierre Charras, jp.charras at wanadoo.fr
 * Copyright (C) 1992-2019 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */

/**
 * @file sch_component.cpp
 * @brief Implementation of the class SCH_COMPONENT.
 */

#include <fctsys.h>
#include <pgm_base.h>
#include <sch_draw_panel.h>
#include <gr_basic.h>
#include <kicad_string.h>
#include <richio.h>
#include <sch_edit_frame.h>
#include <plotter.h>
#include <msgpanel.h>
#include <bitmaps.h>

#include <general.h>
#include <class_library.h>
#include <lib_rectangle.h>
#include <lib_pin.h>
#include <lib_text.h>
#include <sch_component.h>
#include <sch_sheet.h>
#include <sch_sheet_path.h>
#include <netlist_object.h>
#include <lib_draw_item.h>
#include <symbol_lib_table.h>

#include <dialogs/dialog_schematic_find.h>

#include <wx/tokenzr.h>
#include <iostream>
#include <cctype>

#include <eeschema_id.h>    // for MAX_UNIT_COUNT_PER_PACKAGE definition

#include <trace_helpers.h>


/**
 * Function toUTFTildaText
 * convert a wxString to UTF8 and replace any control characters with a ~,
 * where a control character is one of the first ASCII values up to ' ' 32d.
 */
std::string toUTFTildaText( const wxString& txt )
{
    std::string ret = TO_UTF8( txt );

    for( std::string::iterator it = ret.begin();  it!=ret.end();  ++it )
    {
        if( (unsigned char) *it <= ' ' )
            *it = '~';
    }
    return ret;
}


/**
 * Used when a LIB_PART is not found in library
 * to draw a dummy shape
 * This component is a 400 mils square with the text ??
 * DEF DUMMY U 0 40 Y Y 1 0 N
 * F0 "U" 0 -350 60 H V
 * F1 "DUMMY" 0 350 60 H V
 * DRAW
 * T 0 0 0 150 0 0 0 ??
 * S -200 200 200 -200 0 1 0
 * ENDDRAW
 * ENDDEF
 */
static LIB_PART* dummy()
{
    static LIB_PART* part;

    if( !part )
    {
        part = new LIB_PART( wxEmptyString );

        LIB_RECTANGLE* square = new LIB_RECTANGLE( part );

        square->Move( wxPoint( -200, 200 ) );
        square->SetEndPosition( wxPoint( 200, -200 ) );

        LIB_TEXT* text = new LIB_TEXT( part );

        text->SetTextSize( wxSize( 150, 150 ) );
        text->SetText( wxString( wxT( "??" ) ) );

        part->AddDrawItem( square );
        part->AddDrawItem( text );
    }

    return part;
}


SCH_COMPONENT::SCH_COMPONENT( const wxPoint& aPos, SCH_ITEM* aParent ) :
    SCH_ITEM( aParent, SCH_COMPONENT_T )
{
    Init( aPos );
    m_fieldsAutoplaced = AUTOPLACED_NO;
}


SCH_COMPONENT::SCH_COMPONENT( LIB_PART& aPart, LIB_ID aLibId, SCH_SHEET_PATH* sheet,
                              int unit, int convert, const wxPoint& pos, bool setNewItemFlag ) :
    SCH_ITEM( NULL, SCH_COMPONENT_T )
{
    Init( pos );

    m_unit      = unit;
    m_convert   = convert;
    m_lib_id    = aLibId;
    m_part      = aPart.SharedPtr();
    m_fieldsAutoplaced = AUTOPLACED_NO;

    SetTimeStamp( GetNewTimeStamp() );

    if( setNewItemFlag )
        m_Flags = IS_NEW | IS_MOVED;

    // Copy fields from the library component
    UpdateFields( true, true );

    // Update the pin locations
    UpdatePins();

    // Update the reference -- just the prefix for now.
    if( sheet )
        SetRef( sheet, aPart.GetReferenceField().GetText() + wxT( "?" ) );
    else
        m_prefix = aPart.GetReferenceField().GetText() + wxT( "?" );
}


SCH_COMPONENT::SCH_COMPONENT( const SCH_COMPONENT& aComponent ) :
    SCH_ITEM( aComponent )
{
    m_Parent    = aComponent.m_Parent;
    m_Pos       = aComponent.m_Pos;
    m_unit      = aComponent.m_unit;
    m_convert   = aComponent.m_convert;
    m_lib_id    = aComponent.m_lib_id;
    m_part      = aComponent.m_part;

    SetTimeStamp( aComponent.m_TimeStamp );

    m_transform = aComponent.m_transform;
    m_prefix = aComponent.m_prefix;
    m_PathsAndReferences = aComponent.m_PathsAndReferences;
    m_Fields = aComponent.m_Fields;

    // Re-parent the fields, which before this had aComponent as parent
    for( int i = 0; i < GetFieldCount(); ++i )
    {
        GetField( i )->SetParent( this );
    }

    // Copy the pins, and re-parent them
    for( const auto& it : aComponent.m_pins )
    {
        m_pins.emplace( std::make_pair( it.first, it.second ) );
        m_pins.at( it.first ).SetParentComponent( this );
    }

    m_fieldsAutoplaced = aComponent.m_fieldsAutoplaced;
}


void SCH_COMPONENT::Init( const wxPoint& pos )
{
    m_Pos     = pos;
    m_unit    = 1;  // In multi unit chip - which unit to draw.
    m_convert = LIB_ITEM::LIB_CONVERT::BASE;  // De Morgan Handling

    // The rotation/mirror transformation matrix. pos normal
    m_transform = TRANSFORM();

    // construct only the mandatory fields, which are the first 4 only.
    for( int i = 0; i < MANDATORY_FIELDS; ++i )
    {
        SCH_FIELD field( pos, i, this, TEMPLATE_FIELDNAME::GetDefaultFieldName( i ) );

        if( i == REFERENCE )
            field.SetLayer( LAYER_REFERENCEPART );
        else if( i == VALUE )
            field.SetLayer( LAYER_VALUEPART );

        // else keep LAYER_FIELDS from SCH_FIELD constructor

        // SCH_FIELD's implicitly created copy constructor is called in here
        AddField( field );
    }

    m_prefix = wxString( wxT( "U" ) );
    m_isInNetlist = true;
}


EDA_ITEM* SCH_COMPONENT::Clone() const
{
    return new SCH_COMPONENT( *this );
}


void SCH_COMPONENT::ViewGetLayers( int aLayers[], int& aCount ) const
{
    aCount      = 2;
    aLayers[0]  = LAYER_DEVICE;
    aLayers[1]  = LAYER_DEVICE_BACKGROUND;
}


void SCH_COMPONENT::SetLibId( const LIB_ID& aLibId, PART_LIBS* aLibs )
{
    if( m_lib_id != aLibId )
    {
        m_lib_id = aLibId;
        SetModified();

        if( aLibs )
            Resolve( aLibs );
        else
            m_part.reset();
    }
}


void SCH_COMPONENT::SetLibId( const LIB_ID& aLibId, SYMBOL_LIB_TABLE* aSymLibTable,
                              PART_LIB* aCacheLib )
{
    if( m_lib_id == aLibId )
        return;

    m_lib_id = aLibId;
    SetModified();

    LIB_ALIAS* alias = nullptr;

    if( aSymLibTable && aSymLibTable->HasLibrary( m_lib_id.GetLibNickname() ) )
        alias = aSymLibTable->LoadSymbol( m_lib_id.GetLibNickname(), m_lib_id.GetLibItemName() );

    if( !alias && aCacheLib )
        alias = aCacheLib->FindAlias( m_lib_id.Format().wx_str() );

    if( alias && alias->GetPart() )
        m_part = alias->GetPart()->SharedPtr();
    else
        m_part.reset();
}


wxString SCH_COMPONENT::GetDescription() const
{
    if( PART_SPTR part = m_part.lock() )
    {
        LIB_ALIAS* alias = part->GetAlias( GetLibId().GetLibItemName() );

        if( !alias )
            return wxEmptyString;

        return alias->GetDescription();
    }

    return wxEmptyString;
}


wxString SCH_COMPONENT::GetDatasheet() const
{
    if( PART_SPTR part = m_part.lock() )
    {
        LIB_ALIAS* alias = part->GetAlias( GetLibId().GetLibItemName() );

        if( !alias )
            return wxEmptyString;

        return alias->GetDocFileName();
    }

    return wxEmptyString;
}


bool SCH_COMPONENT::Resolve( PART_LIBS* aLibs )
{
    // I've never been happy that the actual individual PART_LIB is left up to
    // flimsy search path ordering.  None-the-less find a part based on that design:
    if( LIB_PART* part = aLibs->FindLibPart( m_lib_id ) )
    {
        m_part = part->SharedPtr();
        return true;
    }

    return false;
}


bool SCH_COMPONENT::Resolve( SYMBOL_LIB_TABLE& aLibTable, PART_LIB* aCacheLib )
{
    LIB_ALIAS* alias = nullptr;

    try
    {
        // LIB_TABLE_BASE::LoadSymbol() throws an IO_ERROR if the the library nickname
        // is not found in the table so check if the library still exists in the table
        // before attempting to load the symbol.
        if( m_lib_id.IsValid() && aLibTable.HasLibrary( m_lib_id.GetLibNickname() ) )
            alias = aLibTable.LoadSymbol( m_lib_id );

        // Fall back to cache library.  This is temporary until the new schematic file
        // format is implemented.
        if( !alias && aCacheLib )
            alias = aCacheLib->FindAlias( m_lib_id.Format().wx_str() );

        if( alias && alias->GetPart() )
        {
            m_part = alias->GetPart()->SharedPtr();
            return true;
        }
    }
    catch( const IO_ERROR& )
    {
        wxLogDebug( "Cannot resolve library symbol %s", m_lib_id.Format().wx_str() );
    }

    return false;
}


// Helper sort function, used in SCH_COMPONENT::ResolveAll, to sort
// sch component by lib_id
static bool sort_by_libid( const SCH_COMPONENT* ref, SCH_COMPONENT* cmp )
{
    if( ref->GetLibId() == cmp->GetLibId() )
    {
        if( ref->GetUnit() == cmp->GetUnit() )
            return ref->GetConvert() < cmp->GetConvert();

        return ref->GetUnit() < cmp->GetUnit();
    }

    return ref->GetLibId() < cmp->GetLibId();
}


void SCH_COMPONENT::ResolveAll( const SCH_COLLECTOR& aComponents, SYMBOL_LIB_TABLE& aLibTable,
                                PART_LIB* aCacheLib )
{
    std::vector<SCH_COMPONENT*> cmp_list;

    for( int i = 0;  i < aComponents.GetCount();  ++i )
    {
        SCH_COMPONENT* cmp = dynamic_cast<SCH_COMPONENT*>( aComponents[i] );

        wxCHECK2_MSG( cmp, continue, "Invalid SCH_COMPONENT pointer in list." );

        cmp_list.push_back( cmp );
    }

    // sort it by lib part. Cmp will be grouped by same lib part.
    std::sort( cmp_list.begin(), cmp_list.end(), sort_by_libid );

    LIB_ID curr_libid;

    for( unsigned ii = 0; ii < cmp_list.size (); ++ii )
    {
        SCH_COMPONENT* cmp = cmp_list[ii];
        curr_libid = cmp->m_lib_id;
        cmp->Resolve( aLibTable, aCacheLib );
        cmp->UpdatePins();

        // Propagate the m_part pointer to other members using the same lib_id
        for( unsigned jj = ii+1; jj < cmp_list.size (); ++jj )
        {
            SCH_COMPONENT* next_cmp = cmp_list[jj];

            if( curr_libid != next_cmp->m_lib_id )
                break;

            next_cmp->m_part = cmp->m_part;

            next_cmp->UpdatePins();

            ii = jj;
        }
    }
}


void SCH_COMPONENT::UpdatePins( const SCH_COLLECTOR& aComponents )
{
    for( int i = 0;  i < aComponents.GetCount();  ++i )
    {
        SCH_COMPONENT* cmp = dynamic_cast<SCH_COMPONENT*>( aComponents[i] );
        wxASSERT( cmp );

        cmp->UpdatePins();
    }
}


void SCH_COMPONENT::UpdatePins( SCH_SHEET_PATH* aSheet )
{
    if( PART_SPTR part = m_part.lock() )
    {
        std::set<LIB_PIN*> stalePins;

        for( auto& it : m_pins )
            stalePins.insert( it.first );

        for( LIB_PIN* libPin = part->GetNextPin(); libPin; libPin = part->GetNextPin( libPin ) )
        {
            wxASSERT( libPin->Type() == LIB_PIN_T );

            if( libPin->GetUnit() && m_unit && ( m_unit != libPin->GetUnit() ) )
                continue;

            if( libPin->GetConvert() && m_convert && ( m_convert != libPin->GetConvert() ) )
                continue;

            if( !m_pins.count( libPin ) )
                m_pins.emplace( std::make_pair( libPin, SCH_PIN( libPin, this ) ) );

            if( aSheet )
                m_pins.at( libPin ).InitializeConnection( *aSheet );

            stalePins.erase( libPin );
        }

        for( auto& stalePin : stalePins )
            m_pins.erase( stalePin );
    }
}


SCH_CONNECTION* SCH_COMPONENT::GetConnectionForPin( LIB_PIN* aPin, const SCH_SHEET_PATH& aSheet )
{
    if( m_pins.count( aPin ) )
        return m_pins.at( aPin ).Connection( aSheet );

    return nullptr;
}


void SCH_COMPONENT::SetUnit( int aUnit )
{
    if( m_unit != aUnit )
    {
        m_unit = aUnit;
        SetModified();
    }
}


void SCH_COMPONENT::UpdateUnit( int aUnit )
{
    m_unit = aUnit;
}


void SCH_COMPONENT::SetConvert( int aConvert )
{
    if( m_convert != aConvert )
    {
        m_convert = aConvert;
        SetModified();
    }
}


void SCH_COMPONENT::SetTransform( const TRANSFORM& aTransform )
{
    if( m_transform != aTransform )
    {
        m_transform = aTransform;
        SetModified();
    }
}


int SCH_COMPONENT::GetUnitCount() const
{
    if( PART_SPTR part = m_part.lock() )
    {
        return part->GetUnitCount();
    }

    return 0;
}


void SCH_COMPONENT::Draw( EDA_DRAW_PANEL* aPanel, wxDC* aDC, const wxPoint& aOffset )
{
    auto opts = PART_DRAW_OPTIONS::Default();
    opts.transform = m_transform;
    opts.draw_visible_fields = false;
    opts.draw_hidden_fields = false;

    if( PART_SPTR part = m_part.lock() )
    {
        part->Draw( aPanel, aDC, m_Pos + aOffset, m_unit, m_convert, opts );
    }
    else    // Use dummy() part if the actual cannot be found.
    {
        dummy()->Draw( aPanel, aDC, m_Pos + aOffset, 0, 0, opts );
    }

    SCH_FIELD* field = GetField( REFERENCE );

    if( field->IsVisible() )
        field->Draw( aPanel, aDC, aOffset );

    for( int ii = VALUE; ii < GetFieldCount(); ii++ )
    {
        field = GetField( ii );
        field->Draw( aPanel, aDC, aOffset );
    }
}


void SCH_COMPONENT::AddHierarchicalReference( const wxString& aPath,
                                              const wxString& aRef,
                                              int             aMulti )
{
    wxString          h_path, h_ref;
    wxStringTokenizer tokenizer;
    wxString          separators( wxT( " " ) );

    // Search for an existing path and remove it if found (should not occur)
    for( unsigned ii = 0; ii < m_PathsAndReferences.GetCount(); ii++ )
    {
        tokenizer.SetString( m_PathsAndReferences[ii], separators );
        h_path = tokenizer.GetNextToken();

        if( h_path.Cmp( aPath ) == 0 )
        {
            m_PathsAndReferences.RemoveAt( ii );
            ii--;
        }
    }

    h_ref = aPath + wxT( " " ) + aRef;
    h_ref << wxT( " " ) << aMulti;
    m_PathsAndReferences.Add( h_ref );
}


wxString SCH_COMPONENT::GetPath( const SCH_SHEET_PATH* sheet ) const
{
    wxCHECK_MSG( sheet != NULL, wxEmptyString,
                 wxT( "Cannot get component path with invalid sheet object." ) );

    wxString str;

    str.Printf( wxT( "%8.8lX" ), (long unsigned) m_TimeStamp );
    return sheet->Path() + str;
}


const wxString SCH_COMPONENT::GetRef( const SCH_SHEET_PATH* sheet )
{
    wxString          path = GetPath( sheet );
    wxString          h_path;
    wxStringTokenizer tokenizer;
    wxString          separators( wxT( " " ) );

    for( unsigned ii = 0; ii < m_PathsAndReferences.GetCount(); ii++ )
    {
        tokenizer.SetString( m_PathsAndReferences[ii], separators );
        h_path = tokenizer.GetNextToken();

        if( h_path.Cmp( path ) == 0 )
            return tokenizer.GetNextToken();
    }

    // if it was not found in m_Paths array, then see if it is in
    // m_Field[REFERENCE] -- if so, use this as a default for this path.
    // this will happen if we load a version 1 schematic file.
    // it will also mean that multiple instances of the same sheet by default
    // all have the same component references, but perhaps this is best.
    if( !GetField( REFERENCE )->GetText().IsEmpty() )
    {
        SetRef( sheet, GetField( REFERENCE )->GetText() );
        return GetField( REFERENCE )->GetText();
    }

    return m_prefix;
}


bool SCH_COMPONENT::IsReferenceStringValid( const wxString& aReferenceString )
{
    wxString text = aReferenceString;
    bool ok = true;

    // Try to unannotate this reference
    while( !text.IsEmpty() && ( text.Last() == '?' || wxIsdigit( text.Last() ) ) )
        text.RemoveLast();

    if( text.IsEmpty() )
        ok = false;

    // Add here other constraints
    // Currently:no other constraint

    return ok;
}


void SCH_COMPONENT::SetRef( const SCH_SHEET_PATH* sheet, const wxString& ref )
{
    wxString          path = GetPath( sheet );

    bool              notInArray = true;

    wxString          h_path, h_ref;
    wxStringTokenizer tokenizer;
    wxString          separators( wxT( " " ) );

    // check to see if it is already there before inserting it
    for( unsigned ii = 0; ii < m_PathsAndReferences.GetCount(); ii++ )
    {
        tokenizer.SetString( m_PathsAndReferences[ii], separators );
        h_path = tokenizer.GetNextToken();

        if( h_path.Cmp( path ) == 0 )
        {
            // just update the reference text, not the timestamp.
            h_ref  = h_path + wxT( " " ) + ref;
            h_ref += wxT( " " );
            tokenizer.GetNextToken();               // Skip old reference
            h_ref += tokenizer.GetNextToken();      // Add part selection

            // Add the part selection
            m_PathsAndReferences[ii] = h_ref;
            notInArray = false;
        }
    }

    if( notInArray )
        AddHierarchicalReference( path, ref, m_unit );

    SCH_FIELD* rf = GetField( REFERENCE );

    if( rf->GetText().IsEmpty()
      || ( abs( rf->GetTextPos().x - m_Pos.x ) + abs( rf->GetTextPos().y - m_Pos.y ) > 10000 ) )
    {
        // move it to a reasonable position
        rf->SetTextPos( m_Pos + wxPoint( 50, 50 ) );
    }

    rf->SetText( ref );  // for drawing.

    // Reinit the m_prefix member if needed
    wxString prefix = ref;

    if( IsReferenceStringValid( prefix ) )
    {
        while( prefix.Last() == '?' || wxIsdigit( prefix.Last() ) )
            prefix.RemoveLast();
    }
    else
    {
        prefix = wxT( "U" );        // Set to default ref prefix
    }

    if( m_prefix != prefix )
        m_prefix = prefix;

    // Power components have references starting with # and are not included in netlists
    m_isInNetlist = ! ref.StartsWith( wxT( "#" ) );
}


void SCH_COMPONENT::SetTimeStamp( timestamp_t aNewTimeStamp )
{
    wxString string_timestamp, string_oldtimestamp;

    string_timestamp.Printf( wxT( "%08lX" ), (long unsigned) aNewTimeStamp );
    string_oldtimestamp.Printf( wxT( "%08lX" ), (long unsigned) m_TimeStamp );
    EDA_ITEM::SetTimeStamp( aNewTimeStamp );

    for( unsigned ii = 0; ii < m_PathsAndReferences.GetCount(); ii++ )
    {
        m_PathsAndReferences[ii].Replace( string_oldtimestamp.GetData(),
                                          string_timestamp.GetData() );
    }
}


int SCH_COMPONENT::GetUnitSelection( SCH_SHEET_PATH* aSheet )
{
    wxString          path = GetPath( aSheet );
    wxString          h_path, h_multi;
    wxStringTokenizer tokenizer;
    wxString          separators( wxT( " " ) );

    for( unsigned ii = 0; ii < m_PathsAndReferences.GetCount(); ii++ )
    {
        tokenizer.SetString( m_PathsAndReferences[ii], separators );
        h_path = tokenizer.GetNextToken();

        if( h_path.Cmp( path ) == 0 )
        {
            tokenizer.GetNextToken();   // Skip reference
            h_multi = tokenizer.GetNextToken();
            long imulti = 1;
            h_multi.ToLong( &imulti );
            return imulti;
        }
    }

    // if it was not found in m_Paths array, then use m_unit.
    // this will happen if we load a version 1 schematic file.
    return m_unit;
}


void SCH_COMPONENT::SetUnitSelection( SCH_SHEET_PATH* aSheet, int aUnitSelection )
{
    wxString          path = GetPath( aSheet );

    bool              notInArray = true;

    wxString          h_path, h_ref;
    wxStringTokenizer tokenizer;
    wxString          separators( wxT( " " ) );

    //check to see if it is already there before inserting it
    for( unsigned ii = 0; ii < m_PathsAndReferences.GetCount(); ii++ )
    {
        tokenizer.SetString( m_PathsAndReferences[ii], separators );
        h_path = tokenizer.GetNextToken();

        if( h_path.Cmp( path ) == 0 )
        {
            //just update the unit selection.
            h_ref  = h_path + wxT( " " );
            h_ref += tokenizer.GetNextToken();      // Add reference
            h_ref += wxT( " " );
            h_ref << aUnitSelection;                // Add part selection

            // Ann the part selection
            m_PathsAndReferences[ii] = h_ref;
            notInArray = false;
        }
    }

    if( notInArray )
        AddHierarchicalReference( path, m_prefix, aUnitSelection );
}


SCH_FIELD* SCH_COMPONENT::GetField( int aFieldNdx ) const
{
    const SCH_FIELD* field;

    if( (unsigned) aFieldNdx < m_Fields.size() )
        field = &m_Fields[aFieldNdx];
    else
        field = NULL;

    wxASSERT( field );

    // use cast to remove const-ness
    return (SCH_FIELD*) field;
}


wxString SCH_COMPONENT::GetFieldText( const wxString& aFieldName, SCH_EDIT_FRAME* aFrame ) const
{
    for( unsigned int ii = 0; ii < m_Fields.size(); ii++ )
    {
        if( aFieldName == m_Fields[ii].GetName() )
            return m_Fields[ii].GetText();
    }

    return wxEmptyString;
}


void SCH_COMPONENT::GetFields( std::vector<SCH_FIELD*>& aVector, bool aVisibleOnly )
{
    for( SCH_FIELD& each_field : m_Fields )
    {
        if( !aVisibleOnly || ( each_field.IsVisible() && !each_field.IsVoid() ) )
            aVector.push_back( &each_field );
    }
}


SCH_FIELD* SCH_COMPONENT::AddField( const SCH_FIELD& aField )
{
    int newNdx = m_Fields.size();

    m_Fields.push_back( aField );
    return &m_Fields[newNdx];
}


void SCH_COMPONENT::RemoveField( const wxString& aFieldName )
{
    for( unsigned i = MANDATORY_FIELDS; i < m_Fields.size(); ++i )
    {
        if( aFieldName == m_Fields[i].GetName( false ) )
        {
            m_Fields.erase( m_Fields.begin() + i );
            return;
        }
    }
}


SCH_FIELD* SCH_COMPONENT::FindField( const wxString& aFieldName, bool aIncludeDefaultFields )
{
    unsigned start = aIncludeDefaultFields ? 0 : MANDATORY_FIELDS;

    for( unsigned i = start;  i<m_Fields.size();  ++i )
    {
        if( aFieldName == m_Fields[i].GetName( false ) )
        {
            return &m_Fields[i];
        }
    }

    return NULL;
}


void SCH_COMPONENT::UpdateFields( bool aResetStyle, bool aResetRef )
{
    if( PART_SPTR part = m_part.lock() )
    {
        LIB_FIELDS fields;
        part->GetFields( fields );

        for( const LIB_FIELD& field : fields )
        {
            // Can no longer insert an empty name, since names are now keys.  The
            // field index is not used beyond the first MANDATORY_FIELDS
            if( field.GetName().IsEmpty() )
                continue;

            // See if field already exists (mandatory fields always exist).
            // for mandatory fields, the name and field id are fixed, so we use the
            // known and fixed id to get them (more reliable than names, which can be translated)
            // for other fields (custom fields), locate the field by same name
            // (field id has no known meaning for custom fields)
            int idx = field.GetId();
            SCH_FIELD* schField;

            if( idx == REFERENCE && !aResetRef )
                continue;
            if( (unsigned) idx < MANDATORY_FIELDS )
                schField = GetField( idx );
            else
                schField = FindField( field.GetName() );

            if( !schField )
            {
                SCH_FIELD newField( wxPoint( 0, 0 ), GetFieldCount(), this, field.GetName() );
                schField = AddField( newField );
            }

            if( aResetStyle )
            {
                schField->ImportValues( field );
                schField->SetTextPos( m_Pos + field.GetTextPos() );
            }

            if( idx == VALUE )
                schField->SetText( m_lib_id.GetLibItemName() ); // fetch alias-specific value
            else if( idx == DATASHEET )
                schField->SetText( GetDatasheet() );            // fetch alias-specific value
            else
                schField->SetText( field.GetText() );
        }
    }
}


LIB_PIN* SCH_COMPONENT::GetPin( const wxString& number )
{
    if( PART_SPTR part = m_part.lock() )
    {
        return part->GetPin( number, m_unit, m_convert );
    }
    return NULL;
}


void SCH_COMPONENT::GetPins( std::vector<LIB_PIN*>& aPinsList )
{
    if( m_part.expired() )
    {
        // no pins; nothing to get
    }
    else if( PART_SPTR part = m_part.lock() )
    {
        part->GetPins( aPinsList, m_unit, m_convert );
    }
    else
        wxFAIL_MSG( "Could not obtain PART_SPTR lock" );
}


SCH_PINS& SCH_COMPONENT::GetPinMap()
{
    return m_pins;
}


void SCH_COMPONENT::SwapData( SCH_ITEM* aItem )
{
    wxCHECK_RET( (aItem != NULL) && (aItem->Type() == SCH_COMPONENT_T),
                 wxT( "Cannot swap data with invalid component." ) );

    SCH_COMPONENT* component = (SCH_COMPONENT*) aItem;

    std::swap( m_lib_id, component->m_lib_id );
    std::swap( m_part, component->m_part );
    std::swap( m_Pos, component->m_Pos );
    std::swap( m_unit, component->m_unit );
    std::swap( m_convert, component->m_convert );
    std::swap( m_pins, component->m_pins );

    TRANSFORM tmp = m_transform;

    m_transform = component->m_transform;
    component->m_transform = tmp;

    m_Fields.swap( component->m_Fields );    // std::vector's swap()

    // Reparent items after copying data
    // (after swap(), m_Parent member does not point to the right parent):
    for( int ii = 0; ii < component->GetFieldCount();  ++ii )
        component->GetField( ii )->SetParent( component );

    for( int ii = 0; ii < GetFieldCount();  ++ii )
        GetField( ii )->SetParent( this );

    std::swap( m_PathsAndReferences, component->m_PathsAndReferences );
}


void SCH_COMPONENT::ClearAnnotation( SCH_SHEET_PATH* aSheetPath )
{
    wxArrayString  reference_fields;
    static const wxChar separators[] = wxT( " " );
    PART_SPTR part = m_part.lock();

    // Build a reference with no annotation,
    // i.e. a reference ended by only one '?'
    wxString defRef = m_prefix;

    if( !IsReferenceStringValid( defRef ) )
    {   // This is a malformed reference: reinit this reference
        m_prefix = defRef = wxT("U");        // Set to default ref prefix
    }

    while( defRef.Last() == '?' )
        defRef.RemoveLast();

    defRef.Append( wxT( "?" ) );

    wxString path;

    if( aSheetPath )
        path = GetPath( aSheetPath );

    for( unsigned int ii = 0; ii < m_PathsAndReferences.GetCount(); ii++ )
    {
        // Break hierarchical reference in path, ref and multi selection:
        reference_fields = wxStringTokenize( m_PathsAndReferences[ii], separators );

        // For all components: if aSheetPath is not NULL,
        // remove annotation only for the given path
        if( aSheetPath == NULL || reference_fields[0].Cmp( path ) == 0 )
        {
            wxString NewHref = reference_fields[0];
            NewHref << wxT( " " ) << defRef << wxT( " " ) << reference_fields[2];
            m_PathsAndReferences[ii] = NewHref;
        }
    }

    // These 2 changes do not work in complex hierarchy.
    // When a clear annotation is made, the calling function must call a
    // UpdateAllScreenReferences for the active sheet.
    // But this call cannot made here.
    m_Fields[REFERENCE].SetText( defRef ); //for drawing.

    SetModified();
}


bool SCH_COMPONENT::AddSheetPathReferenceEntryIfMissing( const wxString& aSheetPathName )
{
    // a empty sheet path is illegal:
    wxCHECK( !aSheetPathName.IsEmpty(), false );

    wxString reference_path;

    // The full component reference path is aSheetPathName + the component time stamp itself
    // full_AR_path is the alternate reference path to search
    wxString full_AR_path = aSheetPathName
                                   + wxString::Format( "%8.8lX", (unsigned long) GetTimeStamp() );

    for( unsigned int ii = 0; ii < m_PathsAndReferences.GetCount(); ii++ )
    {
        // Break hierarchical reference in path, ref and multi selection:
        reference_path = m_PathsAndReferences[ii].BeforeFirst( ' ' );

        // if aSheetPath is found, nothing to do:
        if( reference_path.Cmp( full_AR_path ) == 0 )
            return false;
    }

    // This entry does not exist: add it, with a (temporary?) reference (last ref used for display)
    AddHierarchicalReference( full_AR_path, m_Fields[REFERENCE].GetText(), m_unit );
    return true;
}


void SCH_COMPONENT::SetOrientation( int aOrientation )
{
    TRANSFORM temp = TRANSFORM();
    bool transform = false;

    switch( aOrientation )
    {
    case CMP_ORIENT_0:
    case CMP_NORMAL:                    // default transform matrix
        m_transform.x1 = 1;
        m_transform.y2 = -1;
        m_transform.x2 = m_transform.y1 = 0;
        break;

    case CMP_ROTATE_COUNTERCLOCKWISE:  // Rotate + (incremental rotation)
        temp.x1   = temp.y2 = 0;
        temp.y1   = 1;
        temp.x2   = -1;
        transform = true;
        break;

    case CMP_ROTATE_CLOCKWISE:          // Rotate - (incremental rotation)
        temp.x1   = temp.y2 = 0;
        temp.y1   = -1;
        temp.x2   = 1;
        transform = true;
        break;

    case CMP_MIRROR_Y:                  // Mirror Y (incremental rotation)
        temp.x1   = -1;
        temp.y2   = 1;
        temp.y1   = temp.x2 = 0;
        transform = true;
        break;

    case CMP_MIRROR_X:                  // Mirror X (incremental rotation)
        temp.x1   = 1;
        temp.y2   = -1;
        temp.y1   = temp.x2 = 0;
        transform = true;
        break;

    case CMP_ORIENT_90:
        SetOrientation( CMP_ORIENT_0 );
        SetOrientation( CMP_ROTATE_COUNTERCLOCKWISE );
        break;

    case CMP_ORIENT_180:
        SetOrientation( CMP_ORIENT_0 );
        SetOrientation( CMP_ROTATE_COUNTERCLOCKWISE );
        SetOrientation( CMP_ROTATE_COUNTERCLOCKWISE );
        break;

    case CMP_ORIENT_270:
        SetOrientation( CMP_ORIENT_0 );
        SetOrientation( CMP_ROTATE_CLOCKWISE );
        break;

    case ( CMP_ORIENT_0 + CMP_MIRROR_X ):
        SetOrientation( CMP_ORIENT_0 );
        SetOrientation( CMP_MIRROR_X );
        break;

    case ( CMP_ORIENT_0 + CMP_MIRROR_Y ):
        SetOrientation( CMP_ORIENT_0 );
        SetOrientation( CMP_MIRROR_Y );
        break;

    case ( CMP_ORIENT_90 + CMP_MIRROR_X ):
        SetOrientation( CMP_ORIENT_90 );
        SetOrientation( CMP_MIRROR_X );
        break;

    case ( CMP_ORIENT_90 + CMP_MIRROR_Y ):
        SetOrientation( CMP_ORIENT_90 );
        SetOrientation( CMP_MIRROR_Y );
        break;

    case ( CMP_ORIENT_180 + CMP_MIRROR_X ):
        SetOrientation( CMP_ORIENT_180 );
        SetOrientation( CMP_MIRROR_X );
        break;

    case ( CMP_ORIENT_180 + CMP_MIRROR_Y ):
        SetOrientation( CMP_ORIENT_180 );
        SetOrientation( CMP_MIRROR_Y );
        break;

    case ( CMP_ORIENT_270 + CMP_MIRROR_X ):
        SetOrientation( CMP_ORIENT_270 );
        SetOrientation( CMP_MIRROR_X );
        break;

    case ( CMP_ORIENT_270 + CMP_MIRROR_Y ):
        SetOrientation( CMP_ORIENT_270 );
        SetOrientation( CMP_MIRROR_Y );
        break;

    default:
        transform = false;
        wxMessageBox( wxT( "SetRotateMiroir() error: ill value" ) );
        break;
    }

    if( transform )
    {
        /* The new matrix transform is the old matrix transform modified by the
         *  requested transformation, which is the temp transform (rot,
         *  mirror ..) in order to have (in term of matrix transform):
         *     transform coord = new_m_transform * coord
         *  where transform coord is the coord modified by new_m_transform from
         *  the initial value coord.
         *  new_m_transform is computed (from old_m_transform and temp) to
         *  have:
         *     transform coord = old_m_transform * temp
         */
        TRANSFORM newTransform;

        newTransform.x1 = m_transform.x1 * temp.x1 + m_transform.x2 * temp.y1;
        newTransform.y1 = m_transform.y1 * temp.x1 + m_transform.y2 * temp.y1;
        newTransform.x2 = m_transform.x1 * temp.x2 + m_transform.x2 * temp.y2;
        newTransform.y2 = m_transform.y1 * temp.x2 + m_transform.y2 * temp.y2;
        m_transform = newTransform;
    }
}


int SCH_COMPONENT::GetOrientation()
{
    int rotate_values[] =
    {
        CMP_ORIENT_0,
        CMP_ORIENT_90,
        CMP_ORIENT_180,
        CMP_ORIENT_270,
        CMP_MIRROR_X + CMP_ORIENT_0,
        CMP_MIRROR_X + CMP_ORIENT_90,
        CMP_MIRROR_X + CMP_ORIENT_270,
        CMP_MIRROR_Y,
        CMP_MIRROR_Y + CMP_ORIENT_0,
        CMP_MIRROR_Y + CMP_ORIENT_90,
        CMP_MIRROR_Y + CMP_ORIENT_180,
        CMP_MIRROR_Y + CMP_ORIENT_270
    };

    // Try to find the current transform option:
    TRANSFORM transform = m_transform;

    for( int type_rotate : rotate_values )
    {
        SetOrientation( type_rotate );

        if( transform == m_transform )
            return type_rotate;
    }

    // Error: orientation not found in list (should not happen)
    wxMessageBox( wxT( "Component orientation matrix internal error" ) );
    m_transform = transform;

    return CMP_NORMAL;
}


#if defined(DEBUG)

void SCH_COMPONENT::Show( int nestLevel, std::ostream& os ) const
{
    // for now, make it look like XML:
    NestedSpace( nestLevel, os ) << '<' << GetClass().Lower().mb_str()
                                 << " ref=\"" << TO_UTF8( GetField( 0 )->GetName() )
                                 << '"' << " chipName=\""
                                 << GetLibId().Format() << '"' << m_Pos
                                 << " layer=\"" << m_Layer
                                 << '"' << ">\n";

    // skip the reference, it's been output already.
    for( int i = 1; i < GetFieldCount();  ++i )
    {
        wxString value = GetField( i )->GetText();

        if( !value.IsEmpty() )
        {
            NestedSpace( nestLevel + 1, os ) << "<field" << " name=\""
                                             << TO_UTF8( GetField( i )->GetName() )
                                             << '"' << " value=\""
                                             << TO_UTF8( value ) << "\"/>\n";
        }
    }

    NestedSpace( nestLevel, os ) << "</" << TO_UTF8( GetClass().Lower() ) << ">\n";
}

#endif


EDA_RECT SCH_COMPONENT::GetBodyBoundingBox() const
{
    EDA_RECT    bBox;

    if( PART_SPTR part = m_part.lock() )
    {
        bBox = part->GetBodyBoundingBox( m_unit, m_convert );
    }
    else
    {
        bBox = dummy()->GetBodyBoundingBox( m_unit, m_convert );
    }

    int x0 = bBox.GetX();
    int xm = bBox.GetRight();

    // We must reverse Y values, because matrix orientation
    // suppose Y axis normal for the library items coordinates,
    // m_transform reverse Y values, but bBox is already reversed!
    int y0 = -bBox.GetY();
    int ym = -bBox.GetBottom();

    // Compute the real Boundary box (rotated, mirrored ...)
    int x1 = m_transform.x1 * x0 + m_transform.y1 * y0;
    int y1 = m_transform.x2 * x0 + m_transform.y2 * y0;
    int x2 = m_transform.x1 * xm + m_transform.y1 * ym;
    int y2 = m_transform.x2 * xm + m_transform.y2 * ym;

    // H and W must be > 0:
    if( x2 < x1 )
        std::swap( x2, x1 );

    if( y2 < y1 )
        std::swap( y2, y1 );

    bBox.SetX( x1 );
    bBox.SetY( y1 );
    bBox.SetWidth( x2 - x1 );
    bBox.SetHeight( y2 - y1 );

    bBox.Offset( m_Pos );
    return bBox;
}


const EDA_RECT SCH_COMPONENT::GetBoundingBox() const
{
    EDA_RECT bbox = GetBodyBoundingBox();

    for( size_t i = 0; i < m_Fields.size(); i++ )
        bbox.Merge( m_Fields[i].GetBoundingBox() );

    return bbox;
}


void SCH_COMPONENT::GetMsgPanelInfo( EDA_UNITS_T aUnits, MSG_PANEL_ITEMS& aList )
{
    wxString msg;

    // part and alias can differ if alias is not the root
    if( PART_SPTR part = m_part.lock() )
    {
        if( part.get() != dummy() )
        {
            LIB_ALIAS* alias = nullptr;

            if( part->GetLib() && part->GetLib()->IsCache() )
                alias = part->GetAlias( GetLibId().Format() );
            else
                alias = part->GetAlias( GetLibId().GetLibItemName() );

            if( !alias )
                return;

            if( g_CurrentSheet )
                aList.push_back( MSG_PANEL_ITEM( _( "Reference" ), GetRef( g_CurrentSheet ),
                                                 DARKCYAN ) );

            msg = part->IsPower() ? _( "Power symbol" ) : _( "Value" );

            aList.push_back( MSG_PANEL_ITEM( msg, GetField( VALUE )->GetShownText(), DARKCYAN ) );

            // Display component reference in library and library
            aList.push_back( MSG_PANEL_ITEM( _( "Name" ), GetLibId().GetLibItemName(), BROWN ) );

            if( alias->GetName() != part->GetName() )
                aList.push_back( MSG_PANEL_ITEM( _( "Alias of" ), part->GetName(), BROWN ) );

            if( alias->GetLib() && alias->GetLib()->IsCache() )
                aList.push_back( MSG_PANEL_ITEM( _( "Library" ), alias->GetLibNickname(), RED ) );
            else if( !m_lib_id.GetLibNickname().empty() )
                aList.push_back( MSG_PANEL_ITEM( _( "Library" ), m_lib_id.GetLibNickname(),
                                                 BROWN ) );
            else
                aList.push_back( MSG_PANEL_ITEM( _( "Library" ), _( "Undefined!!!" ), RED ) );

            // Display the current associated footprint, if exists.
            if( !GetField( FOOTPRINT )->IsVoid() )
                msg = GetField( FOOTPRINT )->GetShownText();
            else
                msg = _( "<Unknown>" );

            aList.push_back( MSG_PANEL_ITEM( _( "Footprint" ), msg, DARKRED ) );

            // Display description of the component, and keywords found in lib
            aList.push_back( MSG_PANEL_ITEM( _( "Description" ), alias->GetDescription(),
                                             DARKCYAN ) );
            aList.push_back( MSG_PANEL_ITEM( _( "Key words" ), alias->GetKeyWords(), DARKCYAN ) );
        }
    }
    else
    {
        if( g_CurrentSheet )
            aList.push_back( MSG_PANEL_ITEM( _( "Reference" ), GetRef( g_CurrentSheet ),
                                             DARKCYAN ) );

        aList.push_back( MSG_PANEL_ITEM( _( "Value" ), GetField( VALUE )->GetShownText(),
                                         DARKCYAN ) );
        aList.push_back( MSG_PANEL_ITEM( _( "Name" ), GetLibId().GetLibItemName(), BROWN ) );

        wxString libNickname = GetLibId().GetLibNickname();

        if( libNickname.empty() )
        {
            aList.push_back( MSG_PANEL_ITEM( _( "Library" ), _( "No library defined!" ), RED ) );
        }
        else
        {
            msg.Printf( _( "Symbol not found in %s!" ), libNickname );
            aList.push_back( MSG_PANEL_ITEM( _( "Library" ), msg , RED ) );
        }
    }
}


BITMAP_DEF SCH_COMPONENT::GetMenuImage() const
{
    return add_component_xpm;
}


void SCH_COMPONENT::MirrorY( int aYaxis_position )
{
    int dx = m_Pos.x;

    SetOrientation( CMP_MIRROR_Y );
    MIRROR( m_Pos.x, aYaxis_position );
    dx -= m_Pos.x;     // dx,0 is the move vector for this transform

    for( int ii = 0; ii < GetFieldCount(); ii++ )
    {
        // Move the fields to the new position because the component itself has moved.
        wxPoint pos = GetField( ii )->GetTextPos();
        pos.x -= dx;
        GetField( ii )->SetTextPos( pos );
    }
}


void SCH_COMPONENT::MirrorX( int aXaxis_position )
{
    int dy = m_Pos.y;

    SetOrientation( CMP_MIRROR_X );
    MIRROR( m_Pos.y, aXaxis_position );
    dy -= m_Pos.y;     // dy,0 is the move vector for this transform

    for( int ii = 0; ii < GetFieldCount(); ii++ )
    {
        // Move the fields to the new position because the component itself has moved.
        wxPoint pos = GetField( ii )->GetTextPos();
        pos.y -= dy;
        GetField( ii )->SetTextPos( pos );
    }
}


void SCH_COMPONENT::Rotate( wxPoint aPosition )
{
    wxPoint prev = m_Pos;

    RotatePoint( &m_Pos, aPosition, 900 );

    SetOrientation( CMP_ROTATE_COUNTERCLOCKWISE );

    for( int ii = 0; ii < GetFieldCount(); ii++ )
    {
        // Move the fields to the new position because the component itself has moved.
        wxPoint pos = GetField( ii )->GetTextPos();
        pos.x -= prev.x - m_Pos.x;
        pos.y -= prev.y - m_Pos.y;
        GetField( ii )->SetTextPos( pos );
    }
}


bool SCH_COMPONENT::Matches( wxFindReplaceData& aSearchData, void* aAuxData,
                             wxPoint* aFindLocation )
{
    wxLogTrace( traceFindItem, wxT( "  item " ) + GetSelectMenuText( MILLIMETRES ) );

    // Components are searchable via the child field and pin item text.
    return false;
}


void SCH_COMPONENT::GetEndPoints( std::vector <DANGLING_END_ITEM>& aItemList )
{
    if( PART_SPTR part = m_part.lock() )
    {
        for( LIB_PIN* pin = part->GetNextPin();  pin;  pin = part->GetNextPin( pin ) )
        {
            wxASSERT( pin->Type() == LIB_PIN_T );

            if( pin->GetUnit() && m_unit && ( m_unit != pin->GetUnit() ) )
                continue;

            if( pin->GetConvert() && m_convert && ( m_convert != pin->GetConvert() ) )
                continue;

            DANGLING_END_ITEM item( PIN_END, pin, GetPinPhysicalPosition( pin ), this );
            aItemList.push_back( item );
        }
    }
}


bool SCH_COMPONENT::UpdateDanglingState( std::vector<DANGLING_END_ITEM>& aItemList )
{
    bool changed = false;

    for( auto& it : m_pins )
    {
        bool previousState = it.second.IsDangling();
        it.second.SetIsDangling( true );

        wxPoint pos = m_transform.TransformCoordinate( it.second.GetPosition() ) + m_Pos;

        for( DANGLING_END_ITEM& each_item : aItemList )
        {
            // Some people like to stack pins on top of each other in a symbol to indicate
            // internal connection. While technically connected, it is not particularly useful
            // to display them that way, so skip any pins that are in the same symbol as this
            // one.
            if( each_item.GetParent() == this )
                continue;

            switch( each_item.GetType() )
            {
            case PIN_END:
            case LABEL_END:
            case SHEET_LABEL_END:
            case WIRE_START_END:
            case WIRE_END_END:
            case NO_CONNECT_END:
            case JUNCTION_END:

                if( pos == each_item.GetPosition() )
                    it.second.SetIsDangling( false );

                break;

            default:
                break;
            }

            if( !it.second.IsDangling() )
                break;
        }

        changed = ( changed || ( previousState != it.second.IsDangling() ) );
    }

    return changed;
}


wxPoint SCH_COMPONENT::GetPinPhysicalPosition( const LIB_PIN* Pin ) const
{
    wxCHECK_MSG( Pin != NULL && Pin->Type() == LIB_PIN_T, wxPoint( 0, 0 ),
                 wxT( "Cannot get physical position of pin." ) );

    return m_transform.TransformCoordinate( Pin->GetPosition() ) + m_Pos;
}


bool SCH_COMPONENT::IsSelectStateChanged( const wxRect& aRect )
{
    bool previousState = IsSelected();

    EDA_RECT boundingBox = GetBoundingBox();

    if( aRect.Intersects( boundingBox ) )
        SetFlags( SELECTED );
    else
        ClearFlags( SELECTED );

    return previousState != IsSelected();
}


void SCH_COMPONENT::GetConnectionPoints( std::vector< wxPoint >& aPoints ) const
{
    for( auto& it : m_pins )
        aPoints.push_back( m_transform.TransformCoordinate( it.second.GetPosition() ) + m_Pos );
}


LIB_ITEM* SCH_COMPONENT::GetDrawItem( const wxPoint& aPosition, KICAD_T aType )
{
    UpdatePins();

    if( PART_SPTR part = m_part.lock() )
    {
        // Calculate the position relative to the component.
        wxPoint libPosition = aPosition - m_Pos;

        return part->LocateDrawItem( m_unit, m_convert, aType, libPosition, m_transform );
    }

    return NULL;
}


wxString SCH_COMPONENT::GetSelectMenuText( EDA_UNITS_T aUnits ) const
{
    return wxString::Format( _( "Symbol %s, %s" ),
                             GetLibId().GetLibItemName().wx_str(),
                             GetField( REFERENCE )->GetShownText() );
}


SEARCH_RESULT SCH_COMPONENT::Visit( INSPECTOR aInspector, void* aTestData,
                                    const KICAD_T aFilterTypes[] )
{
    KICAD_T     stype;

    for( const KICAD_T* p = aFilterTypes; (stype = *p) != EOT; ++p )
    {
        // If caller wants to inspect component type or and component children types.
        if( stype == Type() )
        {
            if( SEARCH_QUIT == aInspector( this, aTestData ) )
                return SEARCH_QUIT;
        }

        switch( stype )
        {
        case SCH_FIELD_T:
            // Test the bounding boxes of fields if they are visible and not empty.
            for( int ii = 0; ii < GetFieldCount(); ii++ )
            {
                if( SEARCH_QUIT == aInspector( GetField( ii ), (void*) this ) )
                    return SEARCH_QUIT;
            }
            break;

        case SCH_FIELD_LOCATE_REFERENCE_T:
            if( SEARCH_QUIT == aInspector( GetField( REFERENCE ), (void*) this ) )
                return SEARCH_QUIT;
            break;

        case SCH_FIELD_LOCATE_VALUE_T:
            if( SEARCH_QUIT == aInspector( GetField( VALUE ), (void*) this ) )
                return SEARCH_QUIT;
            break;

        case SCH_FIELD_LOCATE_FOOTPRINT_T:
            if( SEARCH_QUIT == aInspector( GetField( FOOTPRINT ), (void*) this ) )
                return SEARCH_QUIT;
            break;

        case SCH_FIELD_LOCATE_DATASHEET_T:
            if( SEARCH_QUIT == aInspector( GetField( DATASHEET ), (void*) this ) )
                return SEARCH_QUIT;
            break;

        case LIB_PIN_T:
            if( PART_SPTR part = m_part.lock() )
            {
                LIB_PINS pins;

                part->GetPins( pins, m_unit, m_convert );

                for( size_t i = 0;  i < pins.size();  i++ )
                {
                    if( SEARCH_QUIT == aInspector( pins[ i ], (void*) this ) )
                        return SEARCH_QUIT;
                }
            }
            break;

        default:
            break;
        }
    }

    return SEARCH_CONTINUE;
}


void SCH_COMPONENT::GetNetListItem( NETLIST_OBJECT_LIST& aNetListItems,
                                    SCH_SHEET_PATH*      aSheetPath )
{
    if( PART_SPTR part = m_part.lock() )
    {
        for( LIB_PIN* pin = part->GetNextPin();  pin;  pin = part->GetNextPin( pin ) )
        {
            wxASSERT( pin->Type() == LIB_PIN_T );

            if( pin->GetUnit() && ( pin->GetUnit() != GetUnitSelection( aSheetPath ) ) )
                continue;

            if( pin->GetConvert() && ( pin->GetConvert() != GetConvert() ) )
                continue;

            wxPoint pos = GetTransform().TransformCoordinate( pin->GetPosition() ) + m_Pos;

            NETLIST_OBJECT* item = new NETLIST_OBJECT();
            item->m_SheetPathInclude = *aSheetPath;
            item->m_Comp = (SCH_ITEM*) pin;
            item->m_SheetPath = *aSheetPath;
            item->m_Type = NET_PIN;
            item->m_Link = (SCH_ITEM*) this;
            item->m_ElectricalPinType = pin->GetType();
            item->m_PinNum = pin->GetNumber();
            item->m_Label = pin->GetName();
            item->m_Start = item->m_End = pos;

            aNetListItems.push_back( item );

            if( pin->IsPowerConnection() )
            {
                // There is an associated PIN_LABEL.
                item = new NETLIST_OBJECT();
                item->m_SheetPathInclude = *aSheetPath;
                item->m_Comp = NULL;
                item->m_SheetPath = *aSheetPath;
                item->m_Type  = NET_PINLABEL;
                item->m_Label = pin->GetName();
                item->m_Start = pos;
                item->m_End = item->m_Start;

                aNetListItems.push_back( item );
            }
        }
    }
}


bool SCH_COMPONENT::operator <( const SCH_ITEM& aItem ) const
{
    if( Type() != aItem.Type() )
        return Type() < aItem.Type();

    SCH_COMPONENT* component = (SCH_COMPONENT*) &aItem;

    EDA_RECT rect = GetBodyBoundingBox();

    if( rect.GetArea() != component->GetBodyBoundingBox().GetArea() )
        return rect.GetArea() < component->GetBodyBoundingBox().GetArea();

    if( m_Pos.x != component->m_Pos.x )
        return m_Pos.x < component->m_Pos.x;

    if( m_Pos.y != component->m_Pos.y )
        return m_Pos.y < component->m_Pos.y;

    return false;
}


bool SCH_COMPONENT::operator==( const SCH_COMPONENT& aComponent ) const
{
    if( GetFieldCount() !=  aComponent.GetFieldCount() )
        return false;

    for( int i = VALUE; i < GetFieldCount(); i++ )
    {
        if( GetField( i )->GetText().Cmp( aComponent.GetField( i )->GetText() ) != 0 )
            return false;
    }

    return true;
}


bool SCH_COMPONENT::operator!=( const SCH_COMPONENT& aComponent ) const
{
    return !( *this == aComponent );
}


SCH_ITEM& SCH_COMPONENT::operator=( const SCH_ITEM& aItem )
{
    wxCHECK_MSG( Type() == aItem.Type(), *this,
                 wxT( "Cannot assign object type " ) + aItem.GetClass() + wxT( " to type " ) +
                 GetClass() );

    if( &aItem != this )
    {
        SCH_ITEM::operator=( aItem );

        SCH_COMPONENT* c = (SCH_COMPONENT*) &aItem;

        m_lib_id    = c->m_lib_id;
        m_part      = c->m_part;
        m_Pos       = c->m_Pos;
        m_unit      = c->m_unit;
        m_convert   = c->m_convert;
        m_transform = c->m_transform;

        m_PathsAndReferences = c->m_PathsAndReferences;

        m_Fields = c->m_Fields;    // std::vector's assignment operator.

        // Reparent fields after assignment to new component.
        for( int ii = 0; ii < GetFieldCount();  ++ii )
        {
            GetField( ii )->SetParent( this );
        }

        // Copy the pins, and re-parent them
        for( const auto& it : c->m_pins )
        {
            m_pins.emplace( std::make_pair( it.first, it.second ) );
            m_pins.at( it.first ).SetParentComponent( this );
        }
    }

    return *this;
}


bool SCH_COMPONENT::HitTest( const wxPoint& aPosition, int aAccuracy ) const
{
    EDA_RECT bBox = GetBodyBoundingBox();
    bBox.Inflate( aAccuracy );

    if( bBox.Contains( aPosition ) )
        return true;

    return false;
}


bool SCH_COMPONENT::HitTest( const EDA_RECT& aRect, bool aContained, int aAccuracy ) const
{
    if( m_Flags & STRUCT_DELETED || m_Flags & SKIP_STRUCT )
        return false;

    EDA_RECT rect = aRect;

    rect.Inflate( aAccuracy );

    if( aContained )
        return rect.Contains( GetBodyBoundingBox() );

    return rect.Intersects( GetBodyBoundingBox() );
}


bool SCH_COMPONENT::doIsConnected( const wxPoint& aPosition ) const
{
    wxPoint new_pos = m_transform.InverseTransform().TransformCoordinate( aPosition - m_Pos );

    for( const auto& it : m_pins )
    {
        if( it.second.GetPosition() == new_pos )
            return true;
    }

    return false;
}


bool SCH_COMPONENT::IsInNetlist() const
{
    return m_isInNetlist;
}


void SCH_COMPONENT::Plot( PLOTTER* aPlotter )
{
    TRANSFORM temp;

    if( PART_SPTR part = m_part.lock() )
    {
        temp = GetTransform();
        aPlotter->StartBlock( nullptr );

        part->Plot( aPlotter, GetUnit(), GetConvert(), m_Pos, temp );

        for( size_t i = 0; i < m_Fields.size(); i++ )
            m_Fields[i].Plot( aPlotter );

        aPlotter->EndBlock( nullptr );
    }
}


bool SCH_COMPONENT::HasBrightenedPins()
{
    for( auto& it : m_pins )
    {
        if( it.second.IsBrightened() )
            return true;
    }

    return false;
}


void SCH_COMPONENT::ClearBrightenedPins()
{
    for( auto& it : m_pins )
        it.second.ClearBrightened();
}


void SCH_COMPONENT::BrightenPin( LIB_PIN* aPin )
{
    if( m_pins.count( aPin ) )
        m_pins.at( aPin ).SetBrightened();
}


void SCH_COMPONENT::ClearHighlightedPins()
{
    for( auto& it : m_pins )
        it.second.ClearHighlighted();
}


void SCH_COMPONENT::HighlightPin( LIB_PIN* aPin )
{
    if( m_pins.count( aPin ) )
        m_pins.at( aPin ).SetHighlighted();
}


void SCH_COMPONENT::ClearAllHighlightFlags()
{
    ClearFlags( HIGHLIGHTED );

    // Clear the HIGHLIGHTED flag of pins
    ClearHighlightedPins();

    // Clear the HIGHLIGHTED flag of other items, currently only fields
    for( SCH_FIELD& each_field : m_Fields )
        each_field.ClearFlags( HIGHLIGHTED );
}