dialog_net_inspector.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2020 Oleg Endo <[email protected]>
 * Copyright (C) 2019 Jean-Pierre Charras, jp.charras at wanadoo.fr
 * Copyright (C) 1992-2021 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
 */

#include <string_utils.h>
#include <tools/board_inspection_tool.h>
#include <board.h>
#include <board_design_settings.h>
#include <confirm.h>
#include <pcb_track.h>
#include <dialog_net_inspector.h>
#include <eda_pattern_match.h>
#include <wildcards_and_files_ext.h>
#include <view/view.h>
#include <view/view_controls.h>
#include <pcb_painter.h>
#include <connectivity/connectivity_data.h>
#include <connectivity/connectivity_algo.h>
#include <dialogs/dialog_text_entry.h>
#include <validators.h>
#include <bitmaps.h>

#include <wx/tokenzr.h>
#include <wx/filedlg.h>
#include <wx/dcclient.h>

#include <bitset>
#include "wx/wupdlock.h"

struct DIALOG_NET_INSPECTOR::COLUMN_DESC
{
 enum
 {
 CSV_NONE = 0,
 CSV_QUOTE = 1 << 0
 };

 unsigned int num;
 wxString display_name;
 wxString csv_name;
 unsigned int csv_flags;

 operator unsigned int() const
 {
 return num;
 }
};


#define def_col( c, num, name, csv_name, csv_flags ) \
 const DIALOG_NET_INSPECTOR::COLUMN_DESC DIALOG_NET_INSPECTOR::c = { num, \
 name, \
 csv_name, \
 COLUMN_DESC::csv_flags }

def_col( COLUMN_NET, 0, _( "Net" ), _( "Net Code" ), CSV_NONE );
def_col( COLUMN_NAME, 1, _( "Name" ), _( "Net Name" ), CSV_QUOTE );
def_col( COLUMN_PAD_COUNT, 2, _( "Pad Count" ), _( "Pad Count" ), CSV_NONE );
def_col( COLUMN_VIA_COUNT, 3, _( "Via Count" ), _( "Via Count" ), CSV_NONE );
def_col( COLUMN_VIA_LENGTH, 4, _( "Via Length" ), _( "Via Length" ), CSV_NONE );
def_col( COLUMN_BOARD_LENGTH, 5, _( "Track Length" ), _( "Track Length" ), CSV_NONE );
def_col( COLUMN_CHIP_LENGTH, 6, _( "Die Length" ), _( "Die Length" ), CSV_NONE );
def_col( COLUMN_TOTAL_LENGTH, 7, _( "Total Length" ), _( "Net Length" ), CSV_NONE );

#undef def_col


class DIALOG_NET_INSPECTOR::LIST_ITEM
{
private:
 // an item can be the child of only one parent at a time.
 // FIXME: could use a more lightweight container like intrusive forward list.
 LIST_ITEM* m_parent = nullptr;
 std::vector<LIST_ITEM*> m_children;

 bool m_is_group = false;
 unsigned int m_group_number = 0;
 NETINFO_ITEM* m_net = nullptr;
 unsigned int m_pad_count = 0;
 unsigned int m_via_count = 0;
 uint64_t m_via_length = 0;
 uint64_t m_board_wire_length = 0;
 uint64_t m_chip_wire_length = 0;

 // dirty bits to record when some attribute has changed. this is to
 // avoid unnecessary resort operations.
 std::bitset<5> m_column_changed;

 // cached formatted net name for faster display sorting.
 wxString m_net_name;

public:
 LIST_ITEM( unsigned int aGroupNumber, const wxString& aGroupName ) :
 m_is_group( true ),
 m_group_number( aGroupNumber ),
 m_net_name( aGroupName )
 {
 }

 LIST_ITEM( NETINFO_ITEM* aNet ) :
 m_net( aNet )
 {
 m_net_name = UnescapeString( aNet->GetNetname() );
 }

 LIST_ITEM& operator=( const LIST_ITEM& ) = delete;

 bool GetIsGroup() const { return m_is_group; }

 auto ChildrenBegin() const { return m_children.begin(); }
 auto ChildrenEnd() const { return m_children.end(); }
 unsigned int ChildrenCount() const { return m_children.size(); }

 NETINFO_ITEM* GetNet() const { return m_net; }

 int GetNetCode() const
 {
 return GetIsGroup() ? ( 0 - int( m_group_number ) - 1 ) : m_net->GetNetCode();
 }

 const wxString& GetNetName() const { return m_net_name; }
 const wxString& GetGroupName() const { return m_net_name; }

 void ResetColumnChangedBits()
 {
 m_column_changed.reset();
 }

#define gen( mvar, chg_bit, get, set, add, sub, changed ) \
 decltype( mvar ) get() const \
 { \
 return mvar; \
 } \
 \
 bool changed() const \
 { \
 return m_column_changed[chg_bit]; \
 } \
 \
 void set( const decltype( mvar )& aValue ) \
 {  \
 if( m_parent ) \
 m_parent->set( m_parent->get() - mvar + aValue ); \
 \
 static_assert( chg_bit < decltype( m_column_changed )().size(), "" ); \
 m_column_changed[chg_bit] = m_column_changed[chg_bit] | ( mvar != aValue ); \
 mvar = aValue; \
 } \
 \
 void add( const decltype( mvar )& aValue ) \
 { \
 if( m_parent ) \
 m_parent->add( aValue ); \
 \
 static_assert( chg_bit < decltype( m_column_changed )().size(), "" ); \
 m_column_changed[chg_bit] = m_column_changed[chg_bit] | ( aValue != 0 ); \
 mvar += aValue; \
 } \
 \
 void sub( const decltype( mvar )& aValue ) \
 {  \
 if( m_parent ) \
 m_parent->sub( aValue ); \
 \
 static_assert( chg_bit < decltype( m_column_changed )().size(), "" ); \
 m_column_changed[chg_bit] = m_column_changed[chg_bit] | ( aValue != 0 ); \
 mvar -= aValue; \
 }

 gen( m_pad_count, 0, GetPadCount, SetPadCount, AddPadCount, SubPadCount, PadCountChanged );
 gen( m_via_count, 1, GetViaCount, SetViaCount, AddViaCount, SubViaCount, ViaCountChanged );
 gen( m_via_length, 2, GetViaLength, SetViaLength, AddViaLength, SubViaLength, ViaLengthChanged );
 gen( m_board_wire_length, 3, GetBoardWireLength, SetBoardWireLength, AddBoardWireLength,
 SubBoardWireLength, BoardWireLengthChanged );
 gen( m_chip_wire_length, 4, GetChipWireLength, SetChipWireLength, AddChipWireLength,
 SubChipWireLength, ChipWireLengthChanged );

#undef gen

 // the total length column is always computed, never stored.
 unsigned long long int GetTotalLength() const
 {
 return GetBoardWireLength() + GetViaLength() + GetChipWireLength();
 }

 bool TotalLengthChanged() const
 {
 return BoardWireLengthChanged() || ViaLengthChanged() || ChipWireLengthChanged();
 }

 LIST_ITEM* Parent() const
 {
 return m_parent;
 }

 void SetParent( LIST_ITEM* aParent )
 {
 if( m_parent == aParent )
 return;

 if( m_parent != nullptr )
 {
 m_parent->SubPadCount( GetPadCount() );
 m_parent->SubViaCount( GetViaCount() );
 m_parent->SubViaLength( GetViaLength() );
 m_parent->SubBoardWireLength( GetBoardWireLength() );
 m_parent->SubChipWireLength( GetChipWireLength() );

 m_parent->m_children.erase( std::find( m_parent->m_children.begin(),
 m_parent->m_children.end(), this ) );
 }

 m_parent = aParent;

 if( m_parent != nullptr )
 {
 m_parent->AddPadCount( GetPadCount() );
 m_parent->AddViaCount( GetViaCount() );
 m_parent->AddViaLength( GetViaLength() );
 m_parent->AddBoardWireLength( GetBoardWireLength() );
 m_parent->AddChipWireLength( GetChipWireLength() );

 m_parent->m_children.push_back( this );
 }
 }
};


struct DIALOG_NET_INSPECTOR::LIST_ITEM_NETCODE_CMP_LESS
{
 template <typename T>
 bool operator()( const T& a, const T& b ) const
 {
 return a->GetNetCode() < b->GetNetCode();
 }

 template <typename T>
 bool operator()( const T& a, int b ) const
 {
 return a->GetNetCode() < b;
 }

 template <typename T>
 bool operator()( int a, const T& b ) const
 {
 return a < b->GetNetCode();
 }
};


class DIALOG_NET_INSPECTOR::DATA_MODEL : public wxDataViewModel
{
private:
 DIALOG_NET_INSPECTOR& m_parent;

 // primary container, sorted by netcode number.
 // groups have netcode < 0, so they always come first, in the order
 // of the filter strings as input by the user (group mode 0, 1) or
 // in order of occurrence (group mode 2, 3).
 std::vector<std::unique_ptr<LIST_ITEM>> m_items;

public:
 static const auto& columnDesc()
 {
 static const std::array<COLUMN_DESC, 8> r =
 { { COLUMN_NET,
 COLUMN_NAME,
 COLUMN_PAD_COUNT,
 COLUMN_VIA_COUNT,
 COLUMN_VIA_LENGTH,
 COLUMN_BOARD_LENGTH,
 COLUMN_CHIP_LENGTH,
 COLUMN_TOTAL_LENGTH } };

 return r;
 }

 DATA_MODEL( DIALOG_NET_INSPECTOR& parent ) : m_parent( parent )
 {
 }

 unsigned int columnCount() const
 {
 return columnDesc().size();
 }

 unsigned int itemCount() const
 {
 return m_items.size();
 }

 wxVariant valueAt( unsigned int aCol, unsigned int aRow ) const
 {
 wxVariant r;
 GetValue( r, wxDataViewItem( const_cast<LIST_ITEM*>( &*( m_items[aRow] ) ) ), aCol );
 return r;
 }

 const LIST_ITEM& itemAt( unsigned int aRow ) const
 {
 return *m_items.at( aRow );
 }

 OPT<LIST_ITEM_ITER> findItem( int aNetCode )
 {
 auto i = std::lower_bound(
 m_items.begin(), m_items.end(), aNetCode, LIST_ITEM_NETCODE_CMP_LESS() );

 if( i == m_items.end() || ( *i )->GetNetCode() != aNetCode )
 return {};

 return { i };
 }

 OPT<LIST_ITEM_ITER> findItem( NETINFO_ITEM* aNet )
 {
 if( aNet != nullptr )
 return findItem( aNet->GetNetCode() );
 else
 return {};
 }

 OPT<LIST_ITEM_ITER> addItem( std::unique_ptr<LIST_ITEM> aItem )
 {
 if( aItem == nullptr )
 return {};

 // make sure that the vector is always sorted. usually when new nets are added,
 // they always get a higher netcode number than the already existing ones.
 // however, if we've got filtering enabled, we might not have all the nets in
 // our list, so do a sorted insertion.

 auto new_iter = std::lower_bound( m_items.begin(), m_items.end(), aItem->GetNetCode(),
 LIST_ITEM_NETCODE_CMP_LESS() );

 new_iter = m_items.insert( new_iter, std::move( aItem ) );
 const std::unique_ptr<LIST_ITEM>& new_item = *new_iter;

 if( m_parent.m_groupBy->IsChecked()
 && ( m_parent.m_groupByKind->GetSelection() == 0
 || m_parent.m_groupByKind->GetSelection() == 1 ) )
 {
 for( unsigned int j = 0; j < m_parent.m_groupFilter.size(); ++j )
 {
 if( m_parent.m_groupFilter[j]->Find( new_item->GetNetName() ) )
 {
 new_item->SetParent( &*m_items[j] );
 break;
 }
 }
 }
 else if( m_parent.m_groupBy->IsChecked()
 && ( m_parent.m_groupByKind->GetSelection() == 2
 || m_parent.m_groupByKind->GetSelection() == 3 ) )
 {
 auto groups_begin = m_items.begin();
 auto groups_end = std::find_if_not( m_items.begin(), m_items.end(),
 []( const std::unique_ptr<LIST_ITEM>& x )
 {
 return x->GetIsGroup();
 } );

 for( std::unique_ptr<EDA_PATTERN_MATCH>& f : m_parent.m_groupFilter )
 {
 EDA_PATTERN_MATCH::FIND_RESULT match = f->Find( new_item->GetNetName() );

 if( match )
 {
 wxString match_str = new_item->GetNetName().substr( match.start, match.length );

 auto group = std::find_if( groups_begin, groups_end,
 [&]( const std::unique_ptr<LIST_ITEM>& x )
 {
 return x->GetNetName() == match_str;
 } );

 if( group == groups_end )
 {
 int dist = std::distance( groups_end, groups_begin );
 group = m_items.insert( groups_end,
 std::make_unique<LIST_ITEM>( dist, match_str ) );

 groups_end = group + 1;

 ItemAdded( wxDataViewItem(( *group )->Parent() ),
 wxDataViewItem( &**group ) );
 }

 new_item->SetParent( &**group );
 break;
 }
 }
 }

 ItemAdded( wxDataViewItem( new_item->Parent() ), wxDataViewItem( new_item.get() ) );

 return { new_iter };
 }

 void addItems( std::vector<std::unique_ptr<LIST_ITEM>>&& aItems )
 {
 if( m_items.empty() )
 {
 m_items = std::move( aItems );

 if( m_parent.m_groupBy->IsChecked()
 && ( m_parent.m_groupByKind->GetSelection() == 0
 || m_parent.m_groupByKind->GetSelection() == 1 ) )
 {
 // assume that there are fewer group filters than nets.
 // walk over the list items and assign them to groups. note that the
 // first items are group items themselves, so start after those.
 for( unsigned int i = m_parent.m_groupFilter.size(); i < m_items.size(); ++i )
 {
 for( unsigned int j = 0; j < m_parent.m_groupFilter.size(); ++j )
 {
 if( m_parent.m_groupFilter[j]->Find( m_items[ i ]->GetNetName() ) )
 {
 m_items[i]->SetParent( &*m_items[j] );
 break;
 }
 }
 }
 }
 else if( m_parent.m_groupBy->IsChecked()
 && ( m_parent.m_groupByKind->GetSelection() == 2
 || m_parent.m_groupByKind->GetSelection() == 3 ) )
 {
 // assume that there will be fewer resulting groups than nets.
 // dynamically generate groups for the actual strings of the match result.
 // try out each filter on each item and group by the resulting substrings.
 std::vector<std::unique_ptr<LIST_ITEM>> groups;

 for( std::unique_ptr<LIST_ITEM>& i : m_items )
 {
 for( std::unique_ptr<EDA_PATTERN_MATCH>& f : m_parent.m_groupFilter )
 {
 EDA_PATTERN_MATCH::FIND_RESULT match = f->Find( i->GetNetName() );

 if( match )
 {
 wxString match_str = i->GetNetName().substr( match.start, match.length );

 auto group = std::find_if( groups.begin(), groups.end(),
 [&]( const std::unique_ptr<LIST_ITEM>& x )
 {
 return x->GetNetName() == match_str;
 } );

 if( group == groups.end() )
 {
 groups.emplace_back( std::make_unique<LIST_ITEM>( groups.size(),
 match_str ) );
 group = groups.end() - 1;
 }

 i->SetParent( &**group );
 break;
 }
 }
 }

 // insert the group items at the front of the items list.
 for( std::unique_ptr<LIST_ITEM>& g : groups )
 m_items.emplace_back( std::move( g ) );

 std::rotate( m_items.begin(), m_items.end() - groups.size(), m_items.end() );
 }

 for( std::unique_ptr<LIST_ITEM>& i : m_items )
 ItemAdded( wxDataViewItem( i->Parent() ), wxDataViewItem( &*i ) );
 }
 else
 {
 m_items.reserve( m_items.size() + aItems.size() );

 for( std::unique_ptr<LIST_ITEM>& i : aItems )
 addItem( std::move( i ) );
 }
 }

 std::unique_ptr<LIST_ITEM> deleteItem( const OPT<LIST_ITEM_ITER>& aRow )
 {
 if( !aRow )
 return {};

 std::unique_ptr<LIST_ITEM> i = std::move( **aRow );

 // if the row has a parent, detach it first
 LIST_ITEM* parent = i->Parent();
 i->SetParent( nullptr );

 m_items.erase( *aRow );
 ItemDeleted( wxDataViewItem( parent ), wxDataViewItem( &*i ) );

 if( parent )
 {
 ItemChanged( wxDataViewItem( parent ) );

 // for grouping type 2,3 a group item might disappear if it becomes empty.
 if( ( m_parent.m_groupByKind->GetSelection() == 2
 || m_parent.m_groupByKind->GetSelection() == 3 )
 && parent != nullptr && parent->ChildrenCount() == 0 )
 {
 auto p = std::find_if( m_items.begin(), m_items.end(),
 [&]( std::unique_ptr<LIST_ITEM>& x )
 {
 return x.get() == parent;
 } );

 wxASSERT( p != m_items.end() );
 m_items.erase( p );

 ItemDeleted( wxDataViewItem( parent->Parent() ), wxDataViewItem( parent ) );
 }
 }

 Resort();
 return i;
 }

 void deleteAllItems()
 {
 BeforeReset();
 m_items.clear();
 AfterReset();
 }

 void updateItem( const OPT<LIST_ITEM_ITER>& aRow )
 {
 if( aRow )
 {
 const std::unique_ptr<LIST_ITEM>& listItem = *aRow.get();

 if( listItem->Parent() )
 ItemChanged( wxDataViewItem( listItem->Parent() ) );

 ItemChanged( wxDataViewItem( listItem.get() ) );
 resortIfChanged( listItem.get() );
 }
 }

 void updateAllItems()
 {
 for( std::unique_ptr<LIST_ITEM>& i : m_items )
 ItemChanged( wxDataViewItem( i.get() ) );
 }

 void resortIfChanged( LIST_ITEM* aItem )
 {
 if( wxDataViewColumn* column = m_parent.m_netsList->GetSortingColumn() )
 {
 bool changed = false;

 for( const LIST_ITEM* i = aItem; i != nullptr; i = i->Parent() )
 changed |= itemColumnChanged( i, column->GetModelColumn() );

 for( LIST_ITEM* i = aItem; i != nullptr; i = i->Parent() )
 i->ResetColumnChangedBits();

 if( changed )
 Resort();
 }
 }

 bool itemColumnChanged( const LIST_ITEM* aItem, unsigned int aCol ) const
 {
 if( aItem == nullptr || aCol >= columnDesc().size() )
 return false;

 if( aCol == COLUMN_PAD_COUNT )
 return aItem->PadCountChanged();

 else if( aCol == COLUMN_VIA_COUNT )
 return aItem->ViaCountChanged();

 else if( aCol == COLUMN_VIA_LENGTH )
 return aItem->ViaLengthChanged();

 else if( aCol == COLUMN_BOARD_LENGTH )
 return aItem->BoardWireLengthChanged();

 else if( aCol == COLUMN_CHIP_LENGTH )
 return aItem->ChipWireLengthChanged();

 else if( aCol == COLUMN_TOTAL_LENGTH )
 return aItem->TotalLengthChanged();

 return false;
 }

 // implementation of wxDataViewModel interface
 // these are used to query the data model by the GUI view implementation.
 // these are not supposed to be used to modify the data model. for that
 // use the public functions above.

protected:
 unsigned int GetColumnCount() const override
 {
 return columnCount();
 }

 void GetValue( wxVariant& aOutValue, const wxDataViewItem& aItem,
 unsigned int aCol ) const override
 {
 if( LIST_ITEM* i = static_cast<LIST_ITEM*>( aItem.GetID() ) )
 {
 if( aCol == COLUMN_NET && !i->GetIsGroup() )
 aOutValue = m_parent.formatNetCode( i->GetNet() );

 else if( aCol == COLUMN_NET && i->GetIsGroup() )
 aOutValue = "";

 else if( aCol == COLUMN_NAME )
 aOutValue = i->GetNetName();

 else if( aCol == COLUMN_PAD_COUNT )
 aOutValue = m_parent.formatCount( i->GetPadCount() );

 else if( aCol == COLUMN_VIA_COUNT )
 aOutValue = m_parent.formatCount( i->GetViaCount() );

 else if( aCol == COLUMN_VIA_LENGTH )
 aOutValue = m_parent.formatLength( i->GetViaLength() );

 else if( aCol == COLUMN_BOARD_LENGTH )
 aOutValue = m_parent.formatLength( i->GetBoardWireLength() );

 else if( aCol == COLUMN_CHIP_LENGTH )
 aOutValue = m_parent.formatLength( i->GetChipWireLength() );

 else if( aCol == COLUMN_TOTAL_LENGTH )
 aOutValue = m_parent.formatLength( i->GetTotalLength() );
 }
 }

 static int compareUInt( uint64_t aValue1, uint64_t aValue2, bool aAsc )
 {
 if( aAsc )
 return aValue1 < aValue2 ? -1 : 1;
 else
 return aValue2 < aValue1 ? -1 : 1;
 }

 int Compare( const wxDataViewItem& aItem1, const wxDataViewItem& aItem2,
 unsigned int aCol, bool aAsc ) const override
 {
 const LIST_ITEM& i1 = *static_cast<const LIST_ITEM*>( aItem1.GetID() );
 const LIST_ITEM& i2 = *static_cast<const LIST_ITEM*>( aItem2.GetID() );

 if( i1.GetIsGroup() && !i2.GetIsGroup() )
 return -1;

 if( i2.GetIsGroup() && !i1.GetIsGroup() )
 return 1;

 if( aCol == COLUMN_NET && i1.GetNetCode() != i2.GetNetCode() )
 {
 return aAsc ? ( i1.GetNetCode() - i2.GetNetCode() )
 : ( i2.GetNetCode() - i1.GetNetCode() );
 }
 else if( aCol == COLUMN_NAME )
 {
 const wxString& s1 = i1.GetNetName();
 const wxString& s2 = i2.GetNetName();

 int res = aAsc ? s1.Cmp( s2 ) : s2.Cmp( s1 );

 if( res != 0 )
 return res;
 }

 else if( aCol == COLUMN_PAD_COUNT && i1.GetPadCount() != i2.GetPadCount() )
 return compareUInt( i1.GetPadCount(), i2.GetPadCount(), aAsc );

 else if( aCol == COLUMN_VIA_COUNT && i1.GetViaCount() != i2.GetViaCount() )
 return compareUInt( i1.GetViaCount(), i2.GetViaCount(), aAsc );

 else if( aCol == COLUMN_VIA_LENGTH && i1.GetViaLength() != i2.GetViaLength() )
 return compareUInt( i1.GetViaLength(), i2.GetViaLength(), aAsc );

 else if( aCol == COLUMN_BOARD_LENGTH && i1.GetBoardWireLength() != i2.GetBoardWireLength() )
 return compareUInt( i1.GetBoardWireLength(), i2.GetBoardWireLength(), aAsc );

 else if( aCol == COLUMN_CHIP_LENGTH && i1.GetChipWireLength() != i2.GetChipWireLength() )
 return compareUInt( i1.GetChipWireLength(), i2.GetChipWireLength(), aAsc );

 else if( aCol == COLUMN_TOTAL_LENGTH && i1.GetTotalLength() != i2.GetTotalLength() )
 return compareUInt( i1.GetTotalLength(), i2.GetTotalLength(), aAsc );

 // when the item values compare equal resort to pointer comparison.
 wxUIntPtr id1 = wxPtrToUInt( aItem1.GetID() );
 wxUIntPtr id2 = wxPtrToUInt( aItem2.GetID() );

 return aAsc ? id1 - id2 : id2 - id1;
 }

 bool SetValue( const wxVariant& aInValue, const wxDataViewItem& aItem,
 unsigned int aCol ) override
 {
 return false;
 }

 wxDataViewItem GetParent( const wxDataViewItem& aItem ) const override
 {
 if( !aItem.IsOk() )
 return wxDataViewItem();

 return wxDataViewItem( static_cast<const LIST_ITEM*>( aItem.GetID() )->Parent() );
 }

 bool IsContainer( const wxDataViewItem& aItem ) const override
 {
 if( !aItem.IsOk() )
 return true;

 return static_cast<const LIST_ITEM*>( aItem.GetID() )->GetIsGroup();
 }

 bool HasContainerColumns( const wxDataViewItem& aItem ) const override
 {
 return IsContainer( aItem );
 }

 unsigned int GetChildren( const wxDataViewItem& aParent,
 wxDataViewItemArray& aChildren ) const override
 {
 const LIST_ITEM* p = static_cast<const LIST_ITEM*>( aParent.GetID() );

 if( !aParent.IsOk() )
 {
 aChildren.Alloc( m_items.size() );

 for( const std::unique_ptr<LIST_ITEM>& i : m_items )
 {
 if( i->Parent() == nullptr )
 aChildren.Add( wxDataViewItem( &*i ) );
 }

 return aChildren.GetCount();
 }
 else if( p->GetIsGroup() )
 {
 const int count = p->ChildrenCount();

 if( count == 0 )
 return 0;

 aChildren.Alloc( count );

 for( auto i = p->ChildrenBegin(), end = p->ChildrenEnd(); i != end; ++i )
 aChildren.Add( wxDataViewItem( *i ) );

 return aChildren.GetCount();
 }

 return 0;
 }

 wxString GetColumnType( unsigned int /* aCol */ ) const override
 {
 return wxS( "string" );
 }
};


DIALOG_NET_INSPECTOR::DIALOG_NET_INSPECTOR( PCB_EDIT_FRAME* aParent,
 const SETTINGS& aSettings ) :
 DIALOG_NET_INSPECTOR_BASE( aParent ),
 m_zero_netitem( nullptr ),
 m_frame( aParent )
{
 m_brd = aParent->GetBoard();

 m_data_model = new DATA_MODEL( *this );
 m_netsList->AssociateModel( &*m_data_model );

 std::array<std::function<void( void )>, 8> add_col = {
 [&]()
 {
 m_netsList->AppendTextColumn( COLUMN_NET.display_name, COLUMN_NET,
 wxDATAVIEW_CELL_INERT, -1, wxALIGN_LEFT,
 wxDATAVIEW_COL_SORTABLE );
 },
 [&]()
 {
 m_netsList->AppendTextColumn( COLUMN_NAME.display_name, COLUMN_NAME,
 wxDATAVIEW_CELL_INERT, -1, wxALIGN_LEFT,
 wxDATAVIEW_COL_RESIZABLE | wxDATAVIEW_COL_REORDERABLE |
 wxDATAVIEW_COL_SORTABLE );
 },
 [&]()
 {
 m_netsList->AppendTextColumn( COLUMN_PAD_COUNT.display_name, COLUMN_PAD_COUNT,
 wxDATAVIEW_CELL_INERT, -1, wxALIGN_CENTER,
 wxDATAVIEW_COL_REORDERABLE | wxDATAVIEW_COL_SORTABLE );
 },
 [&]()
 {
 m_netsList->AppendTextColumn( COLUMN_VIA_COUNT.display_name, COLUMN_VIA_COUNT,
 wxDATAVIEW_CELL_INERT, -1, wxALIGN_CENTER,
 wxDATAVIEW_COL_REORDERABLE | wxDATAVIEW_COL_SORTABLE );
 },
 [&]()
 {
 m_netsList->AppendTextColumn( COLUMN_VIA_LENGTH.display_name, COLUMN_VIA_LENGTH,
 wxDATAVIEW_CELL_INERT, -1, wxALIGN_CENTER,
 wxDATAVIEW_COL_REORDERABLE | wxDATAVIEW_COL_SORTABLE );
 },
 [&]()
 {
 m_netsList->AppendTextColumn( COLUMN_BOARD_LENGTH.display_name, COLUMN_BOARD_LENGTH,
 wxDATAVIEW_CELL_INERT, -1, wxALIGN_CENTER,
 wxDATAVIEW_COL_REORDERABLE | wxDATAVIEW_COL_SORTABLE );
 },
 [&]()
 {
 m_netsList->AppendTextColumn( COLUMN_CHIP_LENGTH.display_name, COLUMN_CHIP_LENGTH,
 wxDATAVIEW_CELL_INERT, -1, wxALIGN_CENTER,
 wxDATAVIEW_COL_REORDERABLE | wxDATAVIEW_COL_SORTABLE );
 },
 [&]()
 {
 m_netsList->AppendTextColumn( COLUMN_TOTAL_LENGTH.display_name, COLUMN_TOTAL_LENGTH,
 wxDATAVIEW_CELL_INERT, -1, wxALIGN_CENTER,
 wxDATAVIEW_COL_REORDERABLE | wxDATAVIEW_COL_SORTABLE );
 }
 };

 std::vector<int> col_order = aSettings.column_order;

 if( col_order.size() != add_col.size() )
 {
 col_order.resize( add_col.size() );

 for( unsigned int i = 0; i < add_col.size(); ++i )
 col_order[i] = i;
 }

 for( unsigned int i : col_order )
 add_col.at( i )();

 m_netsList->SetExpanderColumn( m_netsList->GetColumn( 0 ) );

 // avoid onFilterChange for each of the settings as it will re-build the
 // list over and over again.
 m_filter_change_no_rebuild = true;

 m_textCtrlFilter->SetValue( aSettings.filter_string );
 m_cbShowZeroPad->SetValue( aSettings.show_zero_pad_nets );
 m_groupBy->SetValue( aSettings.group_by );
 m_groupByKind->SetSelection( aSettings.group_by_kind );
 m_groupByText->SetValue( aSettings.group_by_text );

 m_filter_change_no_rebuild = false;
 buildNetsList();

 adjustListColumns();

 m_addNet->SetBitmap( KiBitmap( BITMAPS::small_plus ) );
 m_renameNet->SetBitmap( KiBitmap( BITMAPS::small_edit ) );
 m_deleteNet->SetBitmap( KiBitmap( BITMAPS::small_trash ) );

 m_sdbSizerOK->SetDefault();
 m_renameNet->Disable();
 m_deleteNet->Disable();

 if( aSettings.sorting_column != -1 )
 {
 if( wxDataViewColumn* c = m_netsList->GetColumn( aSettings.sorting_column ) )
 {
 c->SetSortOrder( aSettings.sort_order_asc );
 m_data_model->Resort();
 }
 }

 finishDialogSettings();

 m_frame->Connect( wxEVT_CLOSE_WINDOW,
 wxCommandEventHandler( DIALOG_NET_INSPECTOR::onParentWindowClosed ),
 nullptr, this );
 m_frame->Connect( UNITS_CHANGED,
 wxCommandEventHandler( DIALOG_NET_INSPECTOR::onUnitsChanged ),
 nullptr, this );
 m_frame->Connect( BOARD_CHANGED,
 wxCommandEventHandler( DIALOG_NET_INSPECTOR::onBoardChanged ),
 nullptr, this );

 if( m_brd != nullptr )
 {
 // if the dialog is opened while something is highlighted on the board ...
 OnBoardHighlightNetChanged( *m_brd );

 m_brd->AddListener( this );
 }
}


DIALOG_NET_INSPECTOR::~DIALOG_NET_INSPECTOR()
{
 // the displayed list elements are going to be deleted before the list view itself.
 // in some cases it might still do queries on the data model, which would crash
 // from now on. so just disassociate it.
 m_netsList->AssociateModel( nullptr );

 m_frame->Disconnect( wxEVT_CLOSE_WINDOW,
 wxCommandEventHandler( DIALOG_NET_INSPECTOR::onParentWindowClosed ),
 nullptr, this );
 m_frame->Disconnect( UNITS_CHANGED,
 wxCommandEventHandler( DIALOG_NET_INSPECTOR::onUnitsChanged ),
 nullptr, this );
 m_frame->Disconnect( BOARD_CHANGED,
 wxCommandEventHandler( DIALOG_NET_INSPECTOR::onBoardChanged ),
 nullptr, this );

 if( m_brd != nullptr )
 m_brd->RemoveListener( this );

 m_frame->GetCanvas()->SetFocus();
}


DIALOG_NET_INSPECTOR::SETTINGS DIALOG_NET_INSPECTOR::Settings() const
{
 std::vector<int> column_order( m_data_model->columnCount() );

 for( unsigned int i = 0; i < column_order.size(); ++i )
 column_order[i] = m_netsList->GetColumn( i )->GetModelColumn();

 wxDataViewColumn* sorting_column = m_netsList->GetSortingColumn();

 SETTINGS r;
 r.filter_string = m_textCtrlFilter->GetValue();
 r.show_zero_pad_nets = m_cbShowZeroPad->IsChecked();
 r.group_by = m_groupBy->IsChecked();
 r.group_by_kind = m_groupByKind->GetSelection();
 r.group_by_text = m_groupByText->GetValue();
 r.sorting_column = sorting_column ? static_cast<int>( sorting_column->GetModelColumn() ) : -1;
 r.sort_order_asc = sorting_column ? sorting_column->IsSortOrderAscending() : true;
 r.column_order = column_order;

 return r;
}


void DIALOG_NET_INSPECTOR::onParentWindowClosed( wxCommandEvent& event )
{
 Close();
 event.Skip();
}


void DIALOG_NET_INSPECTOR::onUnitsChanged( wxCommandEvent& event )
{
 this->m_units = m_frame->GetUserUnits();

 m_data_model->updateAllItems();

 event.Skip();
}


void DIALOG_NET_INSPECTOR::onBoardChanged( wxCommandEvent& event )
{
 m_brd = m_frame->GetBoard();

 if( m_brd != nullptr )
 m_brd->AddListener( this );

 buildNetsList();
 m_netsList->Refresh();

 event.Skip();
}


bool DIALOG_NET_INSPECTOR::netFilterMatches( NETINFO_ITEM* aNet ) const
{
 // Note: the filtering is case insensitive.

 // Never show the unconnected net
 if( aNet->GetNetCode() <= 0 )
 return false;

 // Show unconnected nets only if specifically asked for by filter
 if( m_netFilter.empty() )
 return !aNet->GetNetname().StartsWith( wxT( "unconnected-(" ) );

 wxString net_str = UnescapeString( aNet->GetNetname() ).Upper();

 for( const std::unique_ptr<EDA_PATTERN_MATCH>& f : m_netFilter )
 {
 if( f->Find( net_str ) )
 return true;
 }

 return false;
}


struct NETCODE_CMP_LESS
{
 bool operator()( const CN_ITEM* a, const CN_ITEM* b ) const
 {
 return a->Net() < b->Net();
 }

 bool operator()( const CN_ITEM* a, int b ) const
 {
 return a->Net() < b;
 }

 bool operator()( int a, const CN_ITEM* b ) const
 {
 return a < b->Net();
 }
};


std::vector<CN_ITEM*> DIALOG_NET_INSPECTOR::relevantConnectivityItems() const
{
 // pre-filter the connectivity items and sort them by netcode.
 // this avoids quadratic runtime when building the whole net list and
 // calculating the total length for each net.

 const auto type_bits = std::bitset<MAX_STRUCT_TYPE_ID>()
 .set( PCB_TRACE_T )
 .set( PCB_ARC_T )
 .set( PCB_VIA_T )
 .set( PCB_PAD_T );

 std::vector<CN_ITEM*> cn_items;
 cn_items.reserve( 1024 );

 for( CN_ITEM* cn_item : m_brd->GetConnectivity()->GetConnectivityAlgo()->ItemList() )
 {
 if( cn_item->Valid() && type_bits[cn_item->Parent()->Type()] )
 cn_items.push_back( cn_item );
 }

 std::sort( cn_items.begin(), cn_items.end(), NETCODE_CMP_LESS() );

 return cn_items;
}


void DIALOG_NET_INSPECTOR::updateDisplayedRowValues( const OPT<LIST_ITEM_ITER>& aRow )
{
 if( !aRow )
 return;

 wxDataViewItemArray sel;
 m_netsList->GetSelections( sel );

 m_data_model->updateItem( aRow );

 if( !sel.IsEmpty() )
 {
 m_netsList->SetSelections( sel );
 m_netsList->EnsureVisible( sel.Item( 0 ) );
 }
}


wxString DIALOG_NET_INSPECTOR::formatNetCode( const NETINFO_ITEM* aNet ) const
{
 return wxString::Format( wxT( "%.3d" ), aNet->GetNetCode() );
}


wxString DIALOG_NET_INSPECTOR::formatNetName( const NETINFO_ITEM* aNet ) const
{
 return UnescapeString( aNet->GetNetname() );
}


wxString DIALOG_NET_INSPECTOR::formatCount( unsigned int aValue ) const
{
 return wxString::Format( wxT( "%u" ), aValue );
}


wxString DIALOG_NET_INSPECTOR::formatLength( int64_t aValue ) const
{
 return MessageTextFromValue( GetUserUnits(), static_cast<long long int>( aValue ) );
}


void DIALOG_NET_INSPECTOR::OnBoardItemAdded( BOARD& aBoard, BOARD_ITEM* aBoardItem )
{
 if( NETINFO_ITEM* net = dynamic_cast<NETINFO_ITEM*>( aBoardItem ) )
 {
 // a new net has been added to the board. add it to our list if it
 // passes the netname filter test.

 if( netFilterMatches( net ) )
 {
 std::unique_ptr<LIST_ITEM> new_item = std::make_unique<LIST_ITEM>( net );

 // the new net could have some pads already assigned, count them.
 new_item->SetPadCount( m_brd->GetNodesCount( net->GetNetCode() ) );

 m_data_model->addItem( std::move( new_item ) );
 }
 }
 else if( BOARD_CONNECTED_ITEM* i = dynamic_cast<BOARD_CONNECTED_ITEM*>( aBoardItem ) )
 {
 OPT<LIST_ITEM_ITER> r = m_data_model->findItem( i->GetNet() );

 if( r )
 {
 // try to handle frequent operations quickly.
 if( PCB_TRACK* track = dynamic_cast<PCB_TRACK*>( i ) )
 {
 const std::unique_ptr<LIST_ITEM>& list_item = *r.get();
 int len = track->GetLength();

 list_item->AddBoardWireLength( len );

 if( track->Type() == PCB_VIA_T )
 {
 list_item->AddViaCount( 1 );
 list_item->AddViaLength( calculateViaLength( track ) );
 }

 updateDisplayedRowValues( r );
 return;
 }
 }

 // resort to generic slower net update otherwise.
 updateNet( i->GetNet() );
 }
 else if( FOOTPRINT* footprint = dynamic_cast<FOOTPRINT*>( aBoardItem ) )
 {
 for( const PAD* pad : footprint->Pads() )
 {
 OPT<LIST_ITEM_ITER> r = m_data_model->findItem( pad->GetNet() );

 if( !r )
 {
 // if show-zero-pads is off, we might not have this net
 // in our list yet, so add it first.
 // notice that at this point we are very certain that this net
 // will have at least one pad.

 if( netFilterMatches( pad->GetNet() ) )
 r = m_data_model->addItem( std::make_unique<LIST_ITEM>( pad->GetNet() ) );
 }

 if( r )
 {
 const std::unique_ptr<LIST_ITEM>& list_item = *r.get();
 int len = pad->GetPadToDieLength();

 list_item->AddPadCount( 1 );
 list_item->AddChipWireLength( len );

 if( list_item->GetPadCount() == 0 && !m_cbShowZeroPad->IsChecked() )
 m_data_model->deleteItem( r );
 else
 updateDisplayedRowValues( r );
 }
 }
 }
}


void DIALOG_NET_INSPECTOR::OnBoardItemsAdded( BOARD& aBoard, std::vector<BOARD_ITEM*>& aBoardItem )
{
 for( BOARD_ITEM* item : aBoardItem )
 {
 OnBoardItemAdded( aBoard, item );
 }
}


void DIALOG_NET_INSPECTOR::OnBoardItemRemoved( BOARD& aBoard, BOARD_ITEM* aBoardItem )
{
 if( NETINFO_ITEM* net = dynamic_cast<NETINFO_ITEM*>( aBoardItem ) )
 {
 m_data_model->deleteItem( m_data_model->findItem( net ) );
 }
 else if( FOOTPRINT* footprint = dynamic_cast<FOOTPRINT*>( aBoardItem ) )
 {
 for( const PAD* pad : footprint->Pads() )
 {
 OPT<LIST_ITEM_ITER> r = m_data_model->findItem( pad->GetNet() );

 if( r )
 {
 const std::unique_ptr<LIST_ITEM>& list_item = *r.get();
 int len = pad->GetPadToDieLength();

 list_item->SubPadCount( 1 );
 list_item->SubChipWireLength( len );

 if( list_item->GetPadCount() == 0 && !m_cbShowZeroPad->IsChecked() )
 m_data_model->deleteItem( r );
 else
 updateDisplayedRowValues( r );
 }
 }
 }
 else if( BOARD_CONNECTED_ITEM* i = dynamic_cast<BOARD_CONNECTED_ITEM*>( aBoardItem ) )
 {
 OPT<LIST_ITEM_ITER> r = m_data_model->findItem( i->GetNet() );

 if( r )
 {
 // try to handle frequent operations quickly.
 if( PCB_TRACK* track = dynamic_cast<PCB_TRACK*>( i ) )
 {
 const std::unique_ptr<LIST_ITEM>& list_item = *r.get();
 int len = track->GetLength();

 list_item->SubBoardWireLength( len );

 if( track->Type() == PCB_VIA_T )
 {
 list_item->SubViaCount( 1 );
 list_item->SubViaLength( calculateViaLength( track ) );
 }

 updateDisplayedRowValues( r );
 return;
 }

 // resort to generic slower net update otherwise.
 updateNet( i->GetNet() );
 }
 }
}


void DIALOG_NET_INSPECTOR::OnBoardItemsRemoved( BOARD& aBoard,
 std::vector<BOARD_ITEM*>& aBoardItems )
{
 for( BOARD_ITEM* item : aBoardItems )
 {
 OnBoardItemRemoved( aBoard, item );
 }
}


void DIALOG_NET_INSPECTOR::OnBoardItemChanged( BOARD& aBoard, BOARD_ITEM* aBoardItem )
{
 if( dynamic_cast<BOARD_CONNECTED_ITEM*>( aBoardItem ) != nullptr
 || dynamic_cast<FOOTPRINT*>( aBoardItem ) != nullptr )
 {
 buildNetsList();
 m_netsList->Refresh();
 }
}


void DIALOG_NET_INSPECTOR::OnBoardItemsChanged( BOARD& aBoard,
 std::vector<BOARD_ITEM*>& aBoardItems )
{
 buildNetsList();
 m_netsList->Refresh();
}


void DIALOG_NET_INSPECTOR::OnBoardHighlightNetChanged( BOARD& aBoard )
{
 if( !m_brd->IsHighLightNetON() )
 {
 m_netsList->UnselectAll();
 }
 else
 {
 const std::set<int>& selected_codes = m_brd->GetHighLightNetCodes();

 wxDataViewItemArray new_selection;
 new_selection.Alloc( selected_codes.size() );

 for( int code : selected_codes )
 {
 if( OPT<LIST_ITEM_ITER> r = m_data_model->findItem( code ) )
 new_selection.Add( wxDataViewItem( &***r ) );
 }

 m_netsList->SetSelections( new_selection );

 if( !new_selection.IsEmpty() )
 m_netsList->EnsureVisible( new_selection.Item( 0 ) );
 }
}


void DIALOG_NET_INSPECTOR::OnBoardNetSettingsChanged( BOARD& aBoard )
{
 buildNetsList();
 m_netsList->Refresh();
}


void DIALOG_NET_INSPECTOR::updateNet( NETINFO_ITEM* aNet )
{
 // something for the specified net has changed, update that row.
 // ignore nets that are not in our list because the filter doesn't match.

 if( !netFilterMatches( aNet ) )
 {
 m_data_model->deleteItem( m_data_model->findItem( aNet ) );
 return;
 }

 // if the net had no pads before, it might not be in the displayed list yet.
 // if it had pads and now doesn't anymore, we might need to remove it from the list.

 OPT<LIST_ITEM_ITER> cur_net_row = m_data_model->findItem( aNet );

 const unsigned int node_count = m_brd->GetNodesCount( aNet->GetNetCode() );

 if( node_count == 0 && !m_cbShowZeroPad->IsChecked() )
 {
 m_data_model->deleteItem( cur_net_row );
 return;
 }

 std::unique_ptr<LIST_ITEM> new_list_item = buildNewItem( aNet, node_count,
 relevantConnectivityItems() );

 if( !cur_net_row )
 {
 m_data_model->addItem( std::move( new_list_item ) );
 return;
 }

 const std::unique_ptr<LIST_ITEM>& cur_list_item = *cur_net_row.get();

 if( cur_list_item->GetNetName() != new_list_item->GetNetName() )
 {
 // if the name has changed, it might require re-grouping.
 // it's easier to remove and re-insert it
 m_data_model->deleteItem( cur_net_row );
 m_data_model->addItem( std::move( new_list_item ) );
 }
 else
 {
 // update fields only
 cur_list_item->SetPadCount( new_list_item->GetPadCount() );
 cur_list_item->SetViaCount( new_list_item->GetViaCount() );
 cur_list_item->SetBoardWireLength( new_list_item->GetBoardWireLength() );
 cur_list_item->SetChipWireLength( new_list_item->GetChipWireLength() );

 updateDisplayedRowValues( cur_net_row );
 }
}


unsigned int DIALOG_NET_INSPECTOR::calculateViaLength( const PCB_TRACK* aTrack ) const
{
 const PCB_VIA& via = dynamic_cast<const PCB_VIA&>( *aTrack );
 BOARD_DESIGN_SETTINGS& bds = m_brd->GetDesignSettings();

 // calculate the via length individually from the board stackup and via's start and end layer.
 if( bds.m_HasStackup )
 {
 const BOARD_STACKUP& stackup = bds.GetStackupDescriptor();
 return stackup.GetLayerDistance( via.TopLayer(), via.BottomLayer() );
 }
 else
 {
 int dielectricLayers = bds.GetCopperLayerCount() - 1;
 int layerThickness = bds.GetBoardThickness() / dielectricLayers;
 int effectiveBottomLayer;

 if( via.BottomLayer() == B_Cu )
 effectiveBottomLayer = F_Cu + dielectricLayers;
 else
 effectiveBottomLayer = via.BottomLayer();

 int layerCount = effectiveBottomLayer - via.TopLayer();

 return layerCount * layerThickness;
 }
}


std::unique_ptr<DIALOG_NET_INSPECTOR::LIST_ITEM>
DIALOG_NET_INSPECTOR::buildNewItem( NETINFO_ITEM* aNet, unsigned int aPadCount,
 const std::vector<CN_ITEM*>& aCNItems )
{
 std::unique_ptr<LIST_ITEM> new_item = std::make_unique<LIST_ITEM>( aNet );

 new_item->SetPadCount( aPadCount );

 const auto cn_items = std::equal_range( aCNItems.begin(), aCNItems.end(), aNet->GetNetCode(),
 NETCODE_CMP_LESS() );

 for( auto i = cn_items.first; i != cn_items.second; ++i )
 {
 BOARD_CONNECTED_ITEM* item = ( *i )->Parent();

 if( item->Type() == PCB_PAD_T )
 new_item->AddChipWireLength( static_cast<PAD*>( item )->GetPadToDieLength() );

 else if( PCB_TRACK* track = dynamic_cast<PCB_TRACK*>( item ) )
 {
 new_item->AddBoardWireLength( track->GetLength() );

 if( item->Type() == PCB_VIA_T )
 {
 new_item->AddViaCount( 1 );
 new_item->AddViaLength( calculateViaLength( track ) );
 }
 }
 }

 return new_item;
}


void DIALOG_NET_INSPECTOR::buildNetsList()
{
 // Only build the list of nets if there is a board present
 if( !m_brd )
 return;

 m_in_build_nets_list = true;

 // when rebuilding the netlist, try to keep the row selection
 // FIXME: handle group selections, preserve expanded/collapsed group states
 wxDataViewItemArray sel;
 m_netsList->GetSelections( sel );

 std::vector<int> prev_selected_netcodes;
 prev_selected_netcodes.reserve( sel.GetCount() );

 for( unsigned int i = 0; i < sel.GetCount(); ++i )
 {
 const LIST_ITEM* item = static_cast<const LIST_ITEM*>( sel.Item( i ).GetID() );
 prev_selected_netcodes.push_back( item->GetNetCode() );
 }

 m_data_model->deleteAllItems();

 std::vector<std::unique_ptr<LIST_ITEM>> new_items;

 // for group mode 0,1 each group filter string represents one displayed group,
 // so just add them first. for group mode 2,3 the groups are generated dynamically.
 if( m_groupBy->IsChecked()
 && ( m_groupByKind->GetSelection() == 0 || m_groupByKind->GetSelection() == 1 ) )
 {
 for( unsigned int i = 0; i < m_groupFilter.size(); ++i )
 {
 const std::unique_ptr<EDA_PATTERN_MATCH>& filter = m_groupFilter[i];
 new_items.emplace_back( std::make_unique<LIST_ITEM>( i, filter->GetPattern() ) );
 }
 }

 std::vector<CN_ITEM*> prefiltered_cn_items = relevantConnectivityItems();


 // collect all nets which pass the filter string and also remember the
 // suffix after the filter match, if any.
 struct NET_INFO
 {
 int netcode;
 NETINFO_ITEM* net;
 unsigned int pad_count;
 };

 struct NET_INFO_CMP_LESS
 {
 bool operator()( const NET_INFO& a, const NET_INFO& b ) const
 {
 return a.netcode < b.netcode;
 }
 bool operator()( const NET_INFO& a, int b ) const
 {
 return a.netcode < b;
 }
 bool operator()( int a, const NET_INFO& b ) const
 {
 return a < b.netcode;
 }
 };

 std::vector<NET_INFO> nets;
 nets.reserve( m_brd->GetNetInfo().NetsByNetcode().size() );

 for( const std::pair<int, NETINFO_ITEM*> ni : m_brd->GetNetInfo().NetsByNetcode() )
 {
 if( ni.first == 0 )
 m_zero_netitem = ni.second;

 if( netFilterMatches( ni.second ) )
 nets.emplace_back( NET_INFO{ ni.first, ni.second, 0 } );
 }

 // count the pads for each net. since the nets are sorted by netcode
 // iterating over the footprints' pads is faster.

 for( FOOTPRINT* footprint : m_brd->Footprints() )
 {
 for( PAD* pad : footprint->Pads() )
 {
 auto i = std::lower_bound( nets.begin(), nets.end(), pad->GetNetCode(),
 NET_INFO_CMP_LESS() );

 if( i != nets.end() && i->netcode == pad->GetNetCode() )
 i->pad_count += 1;
 }
 }

 for( NET_INFO& ni : nets )
 {
 if( m_cbShowZeroPad->IsChecked() || ni.pad_count > 0 )
 new_items.emplace_back( buildNewItem( ni.net, ni.pad_count, prefiltered_cn_items ) );
 }


 m_data_model->addItems( std::move( new_items ) );

 // try to restore the selected rows. set the ones that we can't find anymore to -1.
 sel.Clear();

 for( int& nc : prev_selected_netcodes )
 {
 auto r = m_data_model->findItem( nc );

 if( r )
 {
 const std::unique_ptr<LIST_ITEM>& list_item = *r.get();
 sel.Add( wxDataViewItem( list_item.get() ) );
 }
 else
 {
 nc = -1;
 }
 }

 if( !sel.IsEmpty() )
 {
 m_netsList->SetSelections( sel );
 m_netsList->EnsureVisible( sel.Item( 0 ) );
 }
 else
 {
 m_netsList->UnselectAll();
 }

 alg::delete_matching( prev_selected_netcodes, -1 );

 m_frame->GetCanvas()->GetView()->GetPainter()->GetSettings()->SetHighlight( false );

 for( int& i : prev_selected_netcodes )
 m_frame->GetCanvas()->GetView()->GetPainter()->GetSettings()->SetHighlight( true, i, true );

 m_frame->GetCanvas()->GetView()->UpdateAllLayersColor();
 m_frame->GetCanvas()->Refresh();

 m_in_build_nets_list = false;
}


void DIALOG_NET_INSPECTOR::onFilterChange( wxCommandEvent& aEvent )
{
 wxStringTokenizer filters( m_textCtrlFilter->GetValue().Upper(), wxT( "," ) );
 m_netFilter.clear();

 while( filters.HasMoreTokens() )
 {
 wxString t = filters.GetNextToken();
 t.Trim( false );
 t.Trim( true );

 if( !t.IsEmpty() )
 {
 m_netFilter.emplace_back( std::make_unique<EDA_PATTERN_MATCH_WILDCARD>() );
 m_netFilter.back()->SetPattern( t );
 }
 }

 wxStringTokenizer group_filters( m_groupByText->GetValue(), wxT( "," ) );
 m_groupFilter.clear();

 while( group_filters.HasMoreTokens() )
 {
 wxString t = group_filters.GetNextToken();
 t.Trim( false );
 t.Trim( true );

 if( !t.IsEmpty() )
 {
 if( m_groupByKind->GetSelection() == 0 || m_groupByKind->GetSelection() == 2 )
 {
 // type 2: wildcard match, use the matching substring as a group key.
 // the number of groups is determined dynamically by the number of
 // resulting matches in the whole set.
 m_groupFilter.emplace_back( std::make_unique<EDA_PATTERN_MATCH_WILDCARD>() );
 m_groupFilter.back()->SetPattern( t );
 }
 else if( m_groupByKind->GetSelection() == 1 || m_groupByKind->GetSelection() == 3 )
 {
 // type 3: regex match, use the matching substring as a group key.
 // the number of groups is determined dynamically by the number of
 // resulting matches in the whole set.
 m_groupFilter.emplace_back( std::make_unique<EDA_PATTERN_MATCH_REGEX>() );
 m_groupFilter.back()->SetPattern( t );
 }
 }
 }

 if( !m_filter_change_no_rebuild )
 buildNetsList();
}


void DIALOG_NET_INSPECTOR::onSelChanged( wxDataViewEvent& )
{
 onSelChanged();
}


void DIALOG_NET_INSPECTOR::onSelChanged()
{
 // ignore selection changes while the whole list is being rebuilt.
 if( m_in_build_nets_list )
 return;

 RENDER_SETTINGS* ps = m_frame->GetCanvas()->GetView()->GetPainter()->GetSettings();

 bool enable_rename_button = false;
 bool enable_delete_button = false;

 if( m_netsList->HasSelection() )
 {
 wxDataViewItemArray sel;
 m_netsList->GetSelections( sel );

 ps->SetHighlight( false );

 enable_rename_button = sel.GetCount() == 1;
 enable_delete_button = true;

 for( unsigned int i = 0; i < sel.GetCount(); ++i )
 {
 const LIST_ITEM* ii = static_cast<const LIST_ITEM*>( sel.Item( i ).GetID() );

 if( ii->GetIsGroup() )
 {
 enable_rename_button = false;

 for( auto c = ii->ChildrenBegin(), end = ii->ChildrenEnd(); c != end; ++c )
 ps->SetHighlight( true, ( *c )->GetNetCode(), true );
 }
 else
 ps->SetHighlight( true, ii->GetNetCode(), true );
 }
 }
 else
 ps->SetHighlight( false );

 m_frame->GetCanvas()->GetView()->UpdateAllLayersColor();
 m_frame->GetCanvas()->Refresh();

 m_renameNet->Enable( enable_rename_button );
 m_deleteNet->Enable( enable_delete_button );
}


void DIALOG_NET_INSPECTOR::onSortingChanged( wxDataViewEvent& aEvent )
{
 // FIXME: Whenever the sort criteria changes (sorting column)
 // the visible row-numers of the selection get preserved, not the actual
 // elements. Don't know at the moment how to preserve the selection,
 // so just clear it for now.

 m_netsList->UnselectAll();

 m_frame->GetCanvas()->GetView()->GetPainter()->GetSettings()->SetHighlight( false );
 m_frame->GetCanvas()->GetView()->UpdateAllLayersColor();
 m_frame->GetCanvas()->Refresh();
}


void DIALOG_NET_INSPECTOR::adjustListColumns()
{
 wxWindowUpdateLocker locker( m_netsList );

 int w0 = GetTextExtent( COLUMN_NET.display_name ).x;
 int w1 = GetTextExtent( COLUMN_NAME.display_name ).x;
 int w2 = GetTextExtent( COLUMN_PAD_COUNT.display_name ).x;
 int w3 = GetTextExtent( COLUMN_VIA_COUNT.display_name ).x;
 int w4 = GetTextExtent( COLUMN_VIA_LENGTH.display_name ).x;
 int w5 = GetTextExtent( COLUMN_BOARD_LENGTH.display_name ).x;
 int w6 = GetTextExtent( COLUMN_CHIP_LENGTH.display_name ).x;
 int w7 = GetTextExtent( COLUMN_TOTAL_LENGTH.display_name ).x;

 int minValueWidth = GetTextExtent( wxT( "00000,000 mm" ) ).x;
 int minNumberWidth = GetTextExtent( wxT( "000" ) ).x;
 int minNameWidth = GetTextExtent( wxT( "MMMMMM" ) ).x;

 // Considering left and right margins.
 // For wxRenderGeneric it is 5px.
 // Also account for the sorting arrow in the column header.
 // Column 0 also needs space for any potential expander icons.
 const int margins = 15;
 const int extra_width = 30;

 w0 = std::max( w0, minNumberWidth ) + extra_width;
 w1 = std::max( w1, minNameWidth ) + margins;
 w2 = std::max( w2, minNumberWidth ) + margins;
 w3 = std::max( w3, minNumberWidth ) + margins;
 w4 = std::max( w4, minValueWidth ) + margins;
 w5 = std::max( w5, minValueWidth ) + margins;
 w6 = std::max( w6, minValueWidth ) + margins;
 w7 = std::max( w7, minValueWidth ) + margins;

 // the columns might have been reordered. we work on the column model numbers though.
 std::vector<int> column_order( m_data_model->columnCount() );

 for( unsigned int i = 0; i < column_order.size(); ++i )
 column_order[m_netsList->GetColumn( i )->GetModelColumn()] = i;

 assert( column_order.size() == 8 );

 m_netsList->GetColumn( column_order[0] )->SetMinWidth( w0 );
 m_netsList->GetColumn( column_order[1] )->SetMinWidth( w1 );
 m_netsList->GetColumn( column_order[2] )->SetMinWidth( w2 );
 m_netsList->GetColumn( column_order[3] )->SetMinWidth( w3 );
 m_netsList->GetColumn( column_order[4] )->SetMinWidth( w4 );
 m_netsList->GetColumn( column_order[5] )->SetMinWidth( w5 );
 m_netsList->GetColumn( column_order[6] )->SetMinWidth( w6 );
 m_netsList->GetColumn( column_order[7] )->SetMinWidth( w7 );

 // At resizing of the list the width of middle column (Net Names) changes only.
 int width = m_netsList->GetClientSize().x - 24;
 int remaining = width - w0 - w2 - w3 - w4 - w5 - w6 - w7;

 if( remaining > w1 )
 m_netsList->GetColumn( column_order[1] )->SetWidth( remaining );

 m_netsList->Refresh();
}


void DIALOG_NET_INSPECTOR::onListSize( wxSizeEvent& aEvent )
{
 aEvent.Skip();
 adjustListColumns();
}


void DIALOG_NET_INSPECTOR::onAddNet( wxCommandEvent& aEvent )
{
 wxString newNetName;
 NETNAME_VALIDATOR validator( &newNetName );

 WX_TEXT_ENTRY_DIALOG dlg( this, _( "Net name:" ), _( "New Net" ), newNetName );
 dlg.SetTextValidator( validator );

 while( true )
 {
 if( dlg.ShowModal() != wxID_OK || dlg.GetValue().IsEmpty() )
 return; //Aborted by user

 newNetName = dlg.GetValue();

 if( m_brd->FindNet( newNetName ) )
 {
 DisplayError( this, wxString::Format( _( "Net name '%s' is already in use." ),
 newNetName ) );
 newNetName = wxEmptyString;
 }
 else
 {
 break;
 }
 }

 NETINFO_ITEM *newnet = new NETINFO_ITEM( m_brd, dlg.GetValue(), 0 );

 m_brd->Add( newnet );
 m_frame->OnModify();

 // We'll get an OnBoardItemAdded callback from this to update our listbox
}


void DIALOG_NET_INSPECTOR::onRenameNet( wxCommandEvent& aEvent )
{
 if( m_netsList->GetSelectedItemsCount() == 1 )
 {
 const LIST_ITEM* sel = static_cast<const LIST_ITEM*>( m_netsList->GetSelection().GetID() );

 if( sel->GetIsGroup() )
 return;

 NETINFO_ITEM* net = sel->GetNet();
 wxString fullNetName = net->GetNetname();
 wxString netPath;
 wxString shortNetName;

 if( fullNetName.Contains( wxT( "/" ) ) )
 {
 netPath = fullNetName.BeforeLast( '/' ) + '/';
 shortNetName = fullNetName.AfterLast( '/' );
 }
 else
 {
 shortNetName = fullNetName;
 }

 wxString unescapedShortName = UnescapeString( shortNetName );

 WX_TEXT_ENTRY_DIALOG dlg( this, _( "Net name:" ), _( "Rename Net" ), unescapedShortName );
 NETNAME_VALIDATOR validator( &unescapedShortName );
 dlg.SetTextValidator( validator );

 while( true )
 {
 if( dlg.ShowModal() != wxID_OK || dlg.GetValue() == unescapedShortName )
 return;

 unescapedShortName = dlg.GetValue();

 if( unescapedShortName.IsEmpty() )
 {
 DisplayError( this, wxString::Format( _( "Net name cannot be empty." ),
 unescapedShortName ) );
 continue;
 }

 shortNetName = EscapeString( unescapedShortName, CTX_NETNAME );
 fullNetName = netPath + shortNetName;

 if( m_brd->FindNet( shortNetName ) || m_brd->FindNet( fullNetName ) )
 {
 DisplayError( this, wxString::Format( _( "Net name '%s' is already in use." ),
 unescapedShortName ) );
 unescapedShortName = wxEmptyString;
 }
 else
 {
 break;
 }
 }

 // the changed name might require re-grouping. remove and re-insert
 // is easier.
 auto removed_item = m_data_model->deleteItem( m_data_model->findItem( net ) );

 m_brd->GetNetInfo().RemoveNet( net );
 net->SetNetname( fullNetName );
 m_brd->GetNetInfo().AppendNet( net );
 m_frame->OnModify();

 if( netFilterMatches( net ) )
 {
 std::unique_ptr<LIST_ITEM> new_item = std::make_unique<LIST_ITEM>( net );
 new_item->SetPadCount( removed_item->GetPadCount() );
 new_item->SetViaCount( removed_item->GetViaCount() );
 new_item->SetBoardWireLength( removed_item->GetBoardWireLength() );
 new_item->SetChipWireLength( removed_item->GetChipWireLength() );

 OPT<LIST_ITEM_ITER> added_row = m_data_model->addItem( std::move( new_item ) );

 wxDataViewItemArray new_sel;
 new_sel.Add( wxDataViewItem( &***added_row ) );
 m_netsList->SetSelections( new_sel );
 onSelChanged();
 }

 // Currently only tracks and pads have netname annotations and need to be redrawn,
 // but zones are likely to follow. Since we don't have a way to ask what is current,
 // just refresh all items.
 m_frame->GetCanvas()->GetView()->UpdateAllItems( KIGFX::REPAINT );
 m_frame->GetCanvas()->Refresh();
 }
}


void DIALOG_NET_INSPECTOR::onDeleteNet( wxCommandEvent& aEvent )
{
 if( !m_netsList->HasSelection() )
 return;

 wxDataViewItemArray sel;
 m_netsList->GetSelections( sel );

 auto delete_one =
 [this]( const LIST_ITEM* i )
 {
 if( i->GetPadCount() == 0
 || IsOK( this, wxString::Format( _( "Net '%s' is in use. Delete anyway?" ),
 i->GetNetName() ) ) )
 {
 // This is a bit hacky, but it will do for now, since this is the only path
 // outside the netlist updater where you can remove a net from a BOARD.
 int removedCode = i->GetNetCode();

 m_frame->GetCanvas()->GetView()->UpdateAllItemsConditionally( KIGFX::REPAINT,
 [removedCode]( KIGFX::VIEW_ITEM* aItem ) -> bool
 {
 if( auto bci = dynamic_cast<BOARD_CONNECTED_ITEM*>( aItem ) )
 return bci->GetNetCode() == removedCode;

 return false;
 } );

 m_brd->Remove( i->GetNet() );
 m_frame->OnModify();

 // We'll get an OnBoardItemRemoved callback from this to update our listbox
 }
 };

 for( unsigned int i = 0; i < sel.GetCount(); ++i )
 {
 const LIST_ITEM* ii = static_cast<const LIST_ITEM*>( sel.Item( i ).GetID() );

 if( ii->GetIsGroup() )
 {
 if( ii->ChildrenCount() != 0
 && IsOK( this, wxString::Format( _( "Delete all nets in group '%s'?" ),
 ii->GetGroupName() ) ) )
 {
 // we can't be iterating the children container and deleting items from
 // it at the same time. thus take a copy of it first.
 std::vector<const LIST_ITEM*> children;
 children.reserve( ii->ChildrenCount() );
 std::copy( ii->ChildrenBegin(), ii->ChildrenEnd(), std::back_inserter( children ) );

 for( const LIST_ITEM* c : children )
 delete_one( c );
 }
 }
 else
 {
 delete_one( ii );
 }
 }
}


void DIALOG_NET_INSPECTOR::onReport( wxCommandEvent& aEvent )
{
 wxFileDialog dlg( this, _( "Report file" ), "", "",
 _( "Report file" ) + AddFileExtListToFilter( { "csv" } ),
 wxFD_SAVE );

 if( dlg.ShowModal() == wxID_CANCEL )
 return;

 wxTextFile f( dlg.GetPath() );

 f.Create();

 wxString txt;

 // Print Header:
 for( auto&& col : m_data_model->columnDesc() )
 txt += '"' + col.csv_name + wxT( "\";" );

 f.AddLine( txt );

 // Print list of nets:
 const unsigned int num_rows = m_data_model->itemCount();

 for( unsigned int row = 0; row < num_rows; row++ )
 {
 auto& i = m_data_model->itemAt( row );

 if( i.GetIsGroup() || i.GetNetCode() == 0 )
 continue;

 txt = "";

 for( auto&& col : m_data_model->columnDesc() )
 {
 if( col.csv_flags & COLUMN_DESC::CSV_QUOTE )
 txt += '"' + m_data_model->valueAt( col.num, row ).GetString() + wxT( "\";" );
 else
 txt += m_data_model->valueAt( col.num, row ).GetString() + ';';
 }

 f.AddLine( txt );
 }

 f.Write();
 f.Close();
}