sch_move_tool.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2019 CERN
 * Copyright (C) 2019-2021 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 <tool/tool_manager.h>
#include <tools/ee_grid_helper.h>
#include <tools/ee_selection_tool.h>
#include <tools/sch_line_wire_bus_tool.h>
#include <ee_actions.h>
#include <bitmaps.h>
#include <eda_item.h>
#include <sch_item.h>
#include <sch_symbol.h>
#include <sch_sheet.h>
#include <sch_sheet_pin.h>
#include <sch_line.h>
#include <sch_edit_frame.h>
#include <eeschema_id.h>
#include <pgm_base.h>
#include <settings/settings_manager.h>
#include "sch_move_tool.h"


// For adding to or removing from selections
#define QUIET_MODE true


SCH_MOVE_TOOL::SCH_MOVE_TOOL() :
 EE_TOOL_BASE<SCH_EDIT_FRAME>( "eeschema.InteractiveMove" ),
 m_moveInProgress( false ),
 m_isDrag( false ),
 m_moveOffset( 0, 0 )
{
}


bool SCH_MOVE_TOOL::Init()
{
 EE_TOOL_BASE::Init();

 auto moveCondition =
 []( const SELECTION& aSel )
 {
 if( aSel.Empty() || SELECTION_CONDITIONS::OnlyType( SCH_MARKER_T )( aSel ) )
 return false;

 if( SCH_LINE_WIRE_BUS_TOOL::IsDrawingLineWireOrBus( aSel ) )
 return false;

 return true;
 };

 // Add move actions to the selection tool menu
 //
 CONDITIONAL_MENU& selToolMenu = m_selectionTool->GetToolMenu().GetMenu();

 selToolMenu.AddItem( EE_ACTIONS::move, moveCondition, 150 );
 selToolMenu.AddItem( EE_ACTIONS::drag, moveCondition, 150 );
 selToolMenu.AddItem( EE_ACTIONS::alignToGrid, moveCondition, 150 );

 return true;
}


int SCH_MOVE_TOOL::Main( const TOOL_EVENT& aEvent )
{
 EESCHEMA_SETTINGS* cfg = Pgm().GetSettingsManager().GetAppSettings<EESCHEMA_SETTINGS>();
 KIGFX::VIEW_CONTROLS* controls = getViewControls();
 EE_GRID_HELPER grid( m_toolMgr );
 bool wasDragging = m_moveInProgress && m_isDrag;

 m_anchorPos.reset();

 if( aEvent.IsAction( &EE_ACTIONS::move ) )
 m_isDrag = false;
 else if( aEvent.IsAction( &EE_ACTIONS::drag ) )
 m_isDrag = true;
 else if( aEvent.IsAction( &EE_ACTIONS::moveActivate ) )
 m_isDrag = !cfg->m_Input.drag_is_move;
 else
 return 0;

 if( m_moveInProgress )
 {
 if( m_isDrag != wasDragging )
 {
 EDA_ITEM* sel = m_selectionTool->GetSelection().Front();

 if( sel && !sel->IsNew() )
 {
 // Reset the selected items so we can start again with the current m_isDrag
 // state.
 m_frame->RollbackSchematicFromUndo();
 m_selectionTool->RemoveItemsFromSel( &m_dragAdditions, QUIET_MODE );
 m_anchorPos = m_cursor - m_moveOffset;
 m_moveInProgress = false;
 controls->SetAutoPan( false );

 // And give it a kick so it doesn't have to wait for the first mouse movement
 // to refresh.
 m_toolMgr->RunAction( EE_ACTIONS::restartMove );
 }
 }

 return 0;
 }

 // Be sure that there is at least one item that we can move. If there's no selection try
 // looking for the stuff under mouse cursor (i.e. Kicad old-style hover selection).
 EE_SELECTION& selection = m_selectionTool->RequestSelection( EE_COLLECTOR::MovableItems );
 bool unselect = selection.IsHover();

 // Keep an original copy of the starting points for cleanup after the move
 std::vector<DANGLING_END_ITEM> internalPoints;

 Activate();
 // Must be done after Activate() so that it gets set into the correct context
 controls->ShowCursor( true );

 std::string tool = aEvent.GetCommandStr().get();
 m_frame->PushTool( tool );

 if( selection.Empty() )
 {
 // Note that it's important to go through push/pop even when the selection is empty.
 // This keeps other tools from having to special-case an empty move.
 m_frame->PopTool( tool );
 return 0;
 }

 bool restore_state = false;
 bool chain_commands = false;
 TOOL_EVENT* evt = const_cast<TOOL_EVENT*>( &aEvent );
 VECTOR2I prevPos;
 int snapLayer = UNDEFINED_LAYER;

 m_cursor = controls->GetCursorPosition();

 // Main loop: keep receiving events
 do
 {
 m_frame->GetCanvas()->SetCurrentCursor( KICURSOR::MOVING );
 grid.SetSnap( !evt->Modifier( MD_SHIFT ) );
 grid.SetUseGrid( getView()->GetGAL()->GetGridSnapping() && !evt->DisableGridSnapping() );

 if( evt->IsAction( &EE_ACTIONS::moveActivate )
 || evt->IsAction( &EE_ACTIONS::restartMove )
 || evt->IsAction( &EE_ACTIONS::move )
 || evt->IsAction( &EE_ACTIONS::drag )
 || evt->IsMotion()
 || evt->IsDrag( BUT_LEFT )
 || evt->IsAction( &ACTIONS::refreshPreview ) )
 {
 if( !m_moveInProgress ) // Prepare to start moving/dragging
 {
 SCH_ITEM* sch_item = (SCH_ITEM*) selection.Front();
 bool appendUndo = sch_item && sch_item->IsNew();
 bool placingNewItems = sch_item && sch_item->IsNew();

 //------------------------------------------------------------------------
 // Setup a drag or a move
 //
 m_dragAdditions.clear();
 m_specialCaseLabels.clear();
 internalPoints.clear();

 for( SCH_ITEM* it : m_frame->GetScreen()->Items() )
 {
 it->ClearFlags( TEMP_SELECTED );

 if( !it->IsSelected() )
 it->ClearFlags( STARTPOINT | ENDPOINT );

 if( !selection.IsHover() && it->IsSelected() )
 it->SetFlags( STARTPOINT | ENDPOINT );
 }

 if( m_isDrag )
 {
 EDA_ITEMS connectedDragItems;

 // Add connections to the selection for a drag.
 //
 for( EDA_ITEM* edaItem : selection )
 {
 SCH_ITEM* item = static_cast<SCH_ITEM*>( edaItem );
 std::vector<wxPoint> connections;

 if( item->Type() == SCH_LINE_T )
 static_cast<SCH_LINE*>( item )->GetSelectedPoints( connections );
 else
 connections = item->GetConnectionPoints();

 for( wxPoint point : connections )
 getConnectedDragItems( item, point, connectedDragItems );
 }

 for( EDA_ITEM* item : connectedDragItems )
 {
 m_dragAdditions.push_back( item->m_Uuid );
 m_selectionTool->AddItemToSel( item, QUIET_MODE );
 }
 }
 else
 {
 // Mark the edges of the block with dangling flags for a move.
 for( EDA_ITEM* item : selection )
 static_cast<SCH_ITEM*>( item )->GetEndPoints( internalPoints );

 for( EDA_ITEM* item : selection )
 static_cast<SCH_ITEM*>( item )->UpdateDanglingState( internalPoints );
 }
 // Generic setup
 //
 for( EDA_ITEM* item : selection )
 {
 if( static_cast<SCH_ITEM*>( item )->IsConnectable() )
 {
 if( snapLayer == LAYER_GRAPHICS )
 snapLayer = LAYER_ANY;
 else
 snapLayer = LAYER_CONNECTABLE;
 }
 else
 {
 if( snapLayer == LAYER_CONNECTABLE )
 snapLayer = LAYER_ANY;
 else
 snapLayer = LAYER_GRAPHICS;
 }

 if( item->IsNew() )
 {
 if( item->HasFlag( TEMP_SELECTED ) && m_isDrag )
 {
 // Item was added in getConnectedDragItems
 saveCopyInUndoList( (SCH_ITEM*) item, UNDO_REDO::NEWITEM, appendUndo );
 appendUndo = true;
 }
 else
 {
 // Item was added in a previous command (and saved to undo by
 // that command)
 }
 }
 else if( item->GetParent() && item->GetParent()->IsSelected() )
 {
 // Item will be (or has been) saved to undo by parent
 }
 else
 {
 saveCopyInUndoList( (SCH_ITEM*) item, UNDO_REDO::CHANGED, appendUndo );
 appendUndo = true;
 }

 SCH_ITEM* schItem = (SCH_ITEM*) item;
 schItem->SetStoredPos( schItem->GetPosition() );
 }

 // Set up the starting position and move/drag offset
 //
 m_cursor = controls->GetCursorPosition();

 if( evt->IsAction( &EE_ACTIONS::restartMove ) )
 {
 wxASSERT_MSG( m_anchorPos, "Should be already set from previous cmd" );
 }
 else if( placingNewItems )
 {
 m_anchorPos = selection.GetReferencePoint();
 }

 if( m_anchorPos )
 {
 VECTOR2I delta = m_cursor - (*m_anchorPos);
 bool isPasted = false;

 // Drag items to the current cursor position
 for( EDA_ITEM* item : selection )
 {
 // Don't double move pins, fields, etc.
 if( item->GetParent() && item->GetParent()->IsSelected() )
 continue;

 moveItem( item, delta );
 updateItem( item, false );

 isPasted |= ( item->GetFlags() & IS_PASTED ) != 0;
 item->ClearFlags( IS_PASTED );
 }

 // The first time pasted items are moved we need to store
 // the position of the cursor so that rotate while moving
 // works as expected (instead of around the original anchor
 // point
 if( isPasted )
 selection.SetReferencePoint( m_cursor );

 m_anchorPos = m_cursor;
 }
 // For some items, moving the cursor to anchor is not good (for instance large
 // hierarchical sheets or symbols can have the anchor outside the view)
 else if( selection.Size() == 1 && !sch_item->IsMovableFromAnchorPoint() )
 {
 m_cursor = getViewControls()->GetCursorPosition( true );
 m_anchorPos = m_cursor;
 }
 else
 {
 if( m_frame->GetMoveWarpsCursor() )
 {
 // User wants to warp the mouse
 m_cursor = grid.BestDragOrigin( m_cursor, snapLayer, selection );
 selection.SetReferencePoint( m_cursor );
 }
 else
 {
 // User does not want to warp the mouse
 m_cursor = getViewControls()->GetCursorPosition( true );
 }
 }

 controls->SetCursorPosition( m_cursor, false );
 m_toolMgr->PostEvent( EVENTS::SelectedItemsModified );

 prevPos = m_cursor;
 controls->SetAutoPan( true );
 m_moveInProgress = true;
 }

 //------------------------------------------------------------------------
 // Follow the mouse
 //
 m_cursor = grid.BestSnapAnchor( controls->GetCursorPosition( false ),
 snapLayer, selection );

 VECTOR2I delta( m_cursor - prevPos );
 m_anchorPos = m_cursor;

 m_moveOffset += delta;
 prevPos = m_cursor;

 for( EDA_ITEM* item : selection )
 {
 // Don't double move pins, fields, etc.
 if( item->GetParent() && item->GetParent()->IsSelected() )
 continue;

 moveItem( item, delta );
 updateItem( item, false );
 }

 if( selection.HasReferencePoint() )
 selection.SetReferencePoint( selection.GetReferencePoint() + delta );

 m_toolMgr->PostEvent( EVENTS::SelectedItemsMoved );
 }
 //------------------------------------------------------------------------
 // Handle cancel
 //
 else if( evt->IsCancelInteractive() || evt->IsActivate() )
 {
 if( m_moveInProgress )
 {
 if( evt->IsActivate() )
 {
 // Allowing other tools to activate during a move runs the risk of race
 // conditions in which we try to spool up both event loops at once.

 if( m_isDrag )
 m_frame->ShowInfoBarMsg( _( "Press <ESC> to cancel drag." ) );
 else
 m_frame->ShowInfoBarMsg( _( "Press <ESC> to cancel move." ) );

 evt->SetPassEvent( false );
 continue;
 }

 evt->SetPassEvent( false );
 restore_state = true;
 }

 break;
 }
 //------------------------------------------------------------------------
 // Handle TOOL_ACTION special cases
 //
 else if( evt->Action() == TA_UNDO_REDO_PRE )
 {
 unselect = true;
 break;
 }
 else if( evt->IsAction( &ACTIONS::doDelete ) )
 {
 evt->SetPassEvent();
 // Exit on a delete; there will no longer be anything to drag.
 break;
 }
 else if( evt->IsAction( &ACTIONS::duplicate ) )
 {
 if( selection.Front()->IsNew() )
 {
 // This doesn't really make sense; we'll just end up dragging a stack of
 // objects so we ignore the duplicate and just carry on.
 continue;
 }

 // Move original back and exit. The duplicate will run in its own loop.
 restore_state = true;
 unselect = false;
 chain_commands = true;
 break;
 }
 else if( evt->Action() == TA_CHOICE_MENU_CHOICE )
 {
 if( evt->GetCommandId().get() >= ID_POPUP_SCH_SELECT_UNIT_CMP
 && evt->GetCommandId().get() <= ID_POPUP_SCH_SELECT_UNIT_SYM_MAX )
 {
 SCH_SYMBOL* symbol = dynamic_cast<SCH_SYMBOL*>( selection.Front() );
 int unit = evt->GetCommandId().get() - ID_POPUP_SCH_SELECT_UNIT_CMP;

 if( symbol )
 {
 m_frame->SelectUnit( symbol, unit );
 m_toolMgr->RunAction( ACTIONS::refreshPreview );
 }
 }
 }
 //------------------------------------------------------------------------
 // Handle context menu
 //
 else if( evt->IsClick( BUT_RIGHT ) )
 {
 m_menu.ShowContextMenu( m_selectionTool->GetSelection() );
 }
 //------------------------------------------------------------------------
 // Handle drop
 //
 else if( evt->IsMouseUp( BUT_LEFT )
 || evt->IsClick( BUT_LEFT )
 || evt->IsDblClick( BUT_LEFT ) )
 {
 break; // Finish
 }
 else
 {
 evt->SetPassEvent();
 }

 controls->SetAutoPan( m_moveInProgress );

 } while( ( evt = Wait() ) ); //Should be assignment not equality test

 controls->ForceCursorPosition( false );
 controls->ShowCursor( false );
 controls->SetAutoPan( false );

 if( !chain_commands )
 m_moveOffset = { 0, 0 };

 m_anchorPos.reset();

 for( EDA_ITEM* item : selection )
 item->ClearEditFlags();

 if( restore_state )
 {
 m_selectionTool->RemoveItemsFromSel( &m_dragAdditions, QUIET_MODE );
 m_frame->RollbackSchematicFromUndo();
 }
 else
 {
 // One last update after exiting loop (for slower stuff, such as updating SCREEN's RTree).
 for( EDA_ITEM* item : selection )
 updateItem( item, true );

 EE_SELECTION selectionCopy( selection );
 m_selectionTool->RemoveItemsFromSel( &m_dragAdditions, QUIET_MODE );

 // If we move items away from a junction, we _may_ want to add a junction there
 // to denote the state.
 for( const DANGLING_END_ITEM& it : internalPoints )
 {
 if( m_frame->GetScreen()->IsExplicitJunctionNeeded( it.GetPosition()) )
 m_frame->AddJunction( m_frame->GetScreen(), it.GetPosition(), true, false );
 }

 m_toolMgr->RunAction( EE_ACTIONS::addNeededJunctions, true, &selectionCopy );

 m_frame->RecalculateConnections( LOCAL_CLEANUP );
 m_frame->TestDanglingEnds();

 m_frame->OnModify();
 }

 if( unselect )
 m_toolMgr->RunAction( EE_ACTIONS::clearSelection, true );
 else
 m_selectionTool->RebuildSelection(); // Schematic cleanup might have merged lines, etc.

 m_dragAdditions.clear();
 m_moveInProgress = false;
 m_frame->PopTool( tool );
 return 0;
}


void SCH_MOVE_TOOL::getConnectedDragItems( SCH_ITEM* aOriginalItem, const wxPoint& aPoint,
 EDA_ITEMS& aList )
{
 EE_RTREE& items = m_frame->GetScreen()->Items();
 EE_RTREE::EE_TYPE itemsOverlapping = items.Overlapping( aOriginalItem->GetBoundingBox() );
 bool ptHasUnselectedJunction = false;

 for( SCH_ITEM* item : itemsOverlapping )
 {
 if( item->Type() == SCH_JUNCTION_T && item->IsConnected( aPoint ) && !item->IsSelected() )
 {
 ptHasUnselectedJunction = true;
 break;
 }
 }

 for( SCH_ITEM* test : itemsOverlapping )
 {
 if( test == aOriginalItem || test->IsSelected() || !test->CanConnect( aOriginalItem ) )
 continue;

 KICAD_T testType = test->Type();

 switch( testType )
 {
 case SCH_LINE_T:
 {
 // Select the connected end of wires/bus connections that don't have an unselected
 // junction isolating them from the drag
 if( ptHasUnselectedJunction )
 break;

 SCH_LINE* line = static_cast<SCH_LINE*>( test );

 if( line->GetStartPoint() == aPoint )
 {
 if( !line->HasFlag(TEMP_SELECTED ) )
 aList.push_back( line );

 line->SetFlags(STARTPOINT | TEMP_SELECTED );
 }
 else if( line->GetEndPoint() == aPoint )
 {
 if( !line->HasFlag(TEMP_SELECTED ) )
 aList.push_back( line );

 line->SetFlags(ENDPOINT | TEMP_SELECTED );
 }
 else
 {
 break;
 }

 // Since only one end is going to move, the movement vector of any labels attached
 // to it is scaled by the proportion of the line length the label is from the moving
 // end.
 for( SCH_ITEM* item : itemsOverlapping )
 {
 if( item->Type() == SCH_LABEL_T )
 {
 SCH_TEXT* label = static_cast<SCH_TEXT*>( item );

 if( label->IsSelected() )
 continue; // These will be moved on their own because they're selected

 if( label->HasFlag( TEMP_SELECTED ) )
  continue;

 if( label->CanConnect( line ) && line->HitTest( label->GetPosition(), 1 ) )
 {
 label->SetFlags( TEMP_SELECTED );
 aList.push_back( label );

 SPECIAL_CASE_LABEL_INFO info;
 info.attachedLine = line;
 info.originalLabelPos = label->GetPosition();
 m_specialCaseLabels[label] = info;
 }
 }
 }

 break;
 }

 case SCH_SHEET_T:
 case SCH_SYMBOL_T:
 case SCH_JUNCTION_T:
 if( test->IsConnected( aPoint ) )
 {
 // Add a new wire between the symbol or junction and the selected item so
 // the selected item can be dragged.
 SCH_LINE* newWire = nullptr;

 if( test->GetLayer() == LAYER_BUS_JUNCTION ||
 aOriginalItem->GetLayer() == LAYER_BUS )
 {
 newWire = new SCH_LINE( aPoint, LAYER_BUS );
 }
 else
 newWire = new SCH_LINE( aPoint, LAYER_WIRE );

 newWire->SetFlags( IS_NEW );
 m_frame->AddToScreen( newWire, m_frame->GetScreen() );

 newWire->SetFlags( TEMP_SELECTED | STARTPOINT );
 aList.push_back( newWire );
 }
 break;

 case SCH_NO_CONNECT_T:
 // Select no-connects that are connected to items being moved.
 if( !test->HasFlag( TEMP_SELECTED ) && test->IsConnected( aPoint ) )
 {
 aList.push_back( test );
 test->SetFlags( TEMP_SELECTED );
 }

 break;

 case SCH_LABEL_T:
 case SCH_GLOBAL_LABEL_T:
 case SCH_HIER_LABEL_T:
 // Performance optimization:
 if( test->HasFlag( TEMP_SELECTED ) )
 break;

 // Select labels that are connected to a wire (or bus) being moved.
 if( aOriginalItem->Type() == SCH_LINE_T && test->CanConnect( aOriginalItem ) )
 {
 SCH_TEXT* label = static_cast<SCH_TEXT*>( test );
 SCH_LINE* line = static_cast<SCH_LINE*>( aOriginalItem );
 bool oneEndFixed = !line->HasFlag( STARTPOINT ) || !line->HasFlag( ENDPOINT );

 if( line->HitTest( label->GetTextPos(), 1 ) )
 {
 label->SetFlags( TEMP_SELECTED );
 aList.push_back( label );

 if( oneEndFixed )
 {
 SPECIAL_CASE_LABEL_INFO info;
 info.attachedLine = line;
 info.originalLabelPos = label->GetPosition();
 m_specialCaseLabels[ label ] = info;
 }
 }
 }

 break;

 case SCH_BUS_WIRE_ENTRY_T:
 case SCH_BUS_BUS_ENTRY_T:
 // Performance optimization:
 if( test->HasFlag( TEMP_SELECTED ) )
 break;

 // Select bus entries that are connected to a bus being moved.
 if( aOriginalItem->Type() == SCH_LINE_T && test->CanConnect( aOriginalItem ) )
 {
 SCH_LINE* line = static_cast<SCH_LINE*>( aOriginalItem );
 bool oneEndFixed = !line->HasFlag( STARTPOINT ) || !line->HasFlag( ENDPOINT );

 if( oneEndFixed )
 {
 // This is only going to end in tears, so don't go there
 continue;
 }

 for( wxPoint& point : test->GetConnectionPoints() )
 {
 if( line->HitTest( point, 1 ) )
 {
 test->SetFlags( TEMP_SELECTED );
 aList.push_back( test );

 // A bus entry needs its wire & label as well
 std::vector<wxPoint> ends = test->GetConnectionPoints();
 wxPoint otherEnd;

 if( ends[0] == point )
 otherEnd = ends[1];
 else
 otherEnd = ends[0];

 getConnectedDragItems( test, otherEnd, aList );

 // No need to test the other end of the bus entry
 break;
 }
 }
 }

 break;

 default:
 break;
 }
 }
}


void SCH_MOVE_TOOL::moveItem( EDA_ITEM* aItem, const VECTOR2I& aDelta )
{
 switch( aItem->Type() )
 {
 case SCH_LINE_T:
 {
 SCH_LINE* line = static_cast<SCH_LINE*>( aItem );

 if( aItem->HasFlag( STARTPOINT ) )
 line->MoveStart( (wxPoint) aDelta );

 if( aItem->HasFlag( ENDPOINT ) )
 line->MoveEnd( (wxPoint) aDelta );

 }
 break;

 case SCH_PIN_T:
 case SCH_FIELD_T:
 {
 SCH_ITEM* parent = (SCH_ITEM*) aItem->GetParent();
 wxPoint delta( aDelta );

 if( parent && parent->Type() == SCH_SYMBOL_T )
 {
 SCH_SYMBOL* symbol = (SCH_SYMBOL*) aItem->GetParent();
 TRANSFORM transform = symbol->GetTransform().InverseTransform();

 delta = transform.TransformCoordinate( delta );
 }

 static_cast<SCH_ITEM*>( aItem )->Move( delta );

 // If we're moving a field with respect to its parent then it's no longer auto-placed
 if( aItem->Type() == SCH_FIELD_T && parent && !parent->IsSelected() )
 parent->ClearFieldsAutoplaced();

 break;
 }
 case SCH_SHEET_PIN_T:
 {
  SCH_SHEET_PIN* pin = (SCH_SHEET_PIN*) aItem;
 pin->SetStoredPos( pin->GetStoredPos() + (wxPoint) aDelta );
 pin->ConstrainOnEdge( pin->GetStoredPos() );
 break;
 }
 case SCH_LABEL_T:
 {
 SCH_TEXT* label = static_cast<SCH_TEXT*>( aItem );

 if( m_specialCaseLabels.count( label ) )
 {
 SPECIAL_CASE_LABEL_INFO info = m_specialCaseLabels[ label ];
 SEG currentLine( info.attachedLine->GetStartPoint(), info.attachedLine->GetEndPoint() );
 label->SetPosition( (wxPoint) currentLine.NearestPoint( info.originalLabelPos ) );
 }
 else
 {
 label->Move( (wxPoint) aDelta );
  }

 break;
 }
 default:
 static_cast<SCH_ITEM*>( aItem )->Move( (wxPoint) aDelta );
 break;
 }

 getView()->Hide( aItem, false );
 aItem->SetFlags( IS_MOVING );
}


int SCH_MOVE_TOOL::AlignElements( const TOOL_EVENT& aEvent )
{
 EE_GRID_HELPER grid( m_toolMgr);
 EE_SELECTION& selection = m_selectionTool->RequestSelection( EE_COLLECTOR::MovableItems );
 bool append_undo = false;

 for( SCH_ITEM* it : m_frame->GetScreen()->Items() )
 {
 if( !it->IsSelected() )
 it->ClearFlags( STARTPOINT | ENDPOINT );

 if( !selection.IsHover() && it->IsSelected() )
 it->SetFlags( STARTPOINT | ENDPOINT );

 it->SetStoredPos( it->GetPosition() );

 if( it->Type() == SCH_SHEET_T )
 {
 for( SCH_SHEET_PIN* pin : static_cast<SCH_SHEET*>( it )->GetPins() )
 pin->SetStoredPos( pin->GetPosition() );
 }
 }

 for( EDA_ITEM* item : selection )
 {
 if( item->Type() == SCH_LINE_T )
 {
 SCH_LINE* line = static_cast<SCH_LINE*>( item );
 std::vector<int> flags{ STARTPOINT, ENDPOINT };
 std::vector<wxPoint> pts{ line->GetStartPoint(), line->GetEndPoint() };

 for( int ii = 0; ii < 2; ++ii )
 {
 EDA_ITEMS drag_items{ item };
 line->ClearFlags();
 line->SetFlags( SELECTED );
 line->SetFlags( flags[ii] );
 getConnectedDragItems( line, pts[ii], drag_items );
 std::set<EDA_ITEM*> unique_items( drag_items.begin(), drag_items.end() );

 VECTOR2I gridpt = grid.AlignGrid( pts[ii] ) - pts[ii];

 if( gridpt != VECTOR2I( 0, 0 ) )
 {
 for( EDA_ITEM* dragItem : unique_items )
 {
 if( dragItem->GetParent() && dragItem->GetParent()->IsSelected() )
 continue;

 saveCopyInUndoList( dragItem, UNDO_REDO::CHANGED, append_undo );
 append_undo = true;

 moveItem( dragItem, gridpt );
 dragItem->ClearFlags( IS_MOVING );
 updateItem( dragItem, true );
 }
 }
 }
 }
 else if( item->Type() == SCH_FIELD_T )
 {
 VECTOR2I gridpt = grid.AlignGrid( item->GetPosition() ) - item->GetPosition();

 if( gridpt != VECTOR2I( 0, 0 ) )
 {
 saveCopyInUndoList( item, UNDO_REDO::CHANGED, append_undo );
 append_undo = true;

 moveItem( item, gridpt );
 updateItem( item, true );
 item->ClearFlags( IS_MOVING );
 }
 }
 else
 {
 std::vector<wxPoint> connections;
 EDA_ITEMS drag_items{ item };
 connections = static_cast<SCH_ITEM*>( item )->GetConnectionPoints();

 for( const wxPoint& point : connections )
 getConnectedDragItems( static_cast<SCH_ITEM*>( item ), point, drag_items );

 std::map<VECTOR2I, int> shifts;
 VECTOR2I most_common( 0, 0 );
 int max_count = 0;

 for( const wxPoint& conn : connections )
 {
 VECTOR2I gridpt = grid.AlignGrid( conn ) - conn;

 shifts[gridpt]++;

 if( shifts[gridpt] > max_count )
 {
 most_common = gridpt;
 max_count = shifts[most_common];
 }
 }

 if( most_common != VECTOR2I( 0, 0 ) )
 {
 for( EDA_ITEM* dragItem : drag_items )
 {
 if( dragItem->GetParent() && dragItem->GetParent()->IsSelected() )
 continue;

 saveCopyInUndoList( dragItem, UNDO_REDO::CHANGED, append_undo );
 append_undo = true;

 moveItem( dragItem, most_common );
 dragItem->ClearFlags( IS_MOVING );
 updateItem( dragItem, true );
 }
 }
 }
 }

 m_toolMgr->PostEvent( EVENTS::SelectedItemsMoved );
 m_toolMgr->RunAction( EE_ACTIONS::addNeededJunctions, true, &selection );

 m_frame->RecalculateConnections( LOCAL_CLEANUP );
 m_frame->TestDanglingEnds();

 m_frame->OnModify();
 return 0;
}


void SCH_MOVE_TOOL::setTransitions()
{
 Go( &SCH_MOVE_TOOL::Main, EE_ACTIONS::moveActivate.MakeEvent() );
 Go( &SCH_MOVE_TOOL::Main, EE_ACTIONS::move.MakeEvent() );
 Go( &SCH_MOVE_TOOL::Main, EE_ACTIONS::drag.MakeEvent() );
 Go( &SCH_MOVE_TOOL::AlignElements, EE_ACTIONS::alignToGrid.MakeEvent() );
}