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) 2019-2024 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 <cmath>
#include <wx/log.h>
#include <trigo.h>
#include <gal/graphics_abstraction_layer.h>
#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 <sch_commit.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_junction.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_inMoveTool( false ),
 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::OnlyTypes( { 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;
}
 
 
void SCH_MOVE_TOOL::orthoLineDrag( SCH_COMMIT* aCommit, SCH_LINE* line, const VECTOR2I& splitDelta,
 int& xBendCount, int& yBendCount, const EE_GRID_HELPER& grid )
{
 // If the move is not the same angle as this move, then we need to do something special with
 // the unselected end to maintain orthogonality. Either drag some connected line that is the
 // same angle as the move or add two lines to make a 90 degree connection
 if( !EDA_ANGLE( splitDelta ).IsParallelTo( line->Angle() ) || line->GetLength() == 0 )
 {
 VECTOR2I unselectedEnd = line->HasFlag( STARTPOINT ) ? line->GetEndPoint()
 : line->GetStartPoint();
 VECTOR2I selectedEnd = line->HasFlag( STARTPOINT ) ? line->GetStartPoint()
 : line->GetEndPoint();
 
 // Look for pre-existing lines we can drag with us instead of creating new ones
 bool foundAttachment = false;
 bool foundJunction = false;
 bool foundPin = false;
 SCH_LINE* foundLine = nullptr;
 
 for( EDA_ITEM* cItem : m_lineConnectionCache[line] )
 {
 foundAttachment = true;
 
 // If the move is the same angle as a connected line, we can shrink/extend that line
 // endpoint
 switch( cItem->Type() )
 {
 case SCH_LINE_T:
 {
 SCH_LINE* cLine = static_cast<SCH_LINE*>( cItem );
 
 // A matching angle on a non-zero-length line means lengthen/shorten will work
 if( EDA_ANGLE( splitDelta ).IsParallelTo( cLine->Angle() )
 && cLine->GetLength() != 0 )
 {
 foundLine = cLine;
 }
 
 // Zero length lines are lines that this algorithm has shortened to 0 so they also
 // work but we should prefer using a segment with length and angle matching when
 // we can (otherwise the zero length line will draw overlapping segments on them)
 if( !foundLine && cLine->GetLength() == 0 )
 foundLine = cLine;
 
 break;
 }
 case SCH_JUNCTION_T:
 foundJunction = true;
 break;
 
 case SCH_PIN_T:
 foundPin = true;
 break;
 
 default:
 break;
 }
 }
 
 // Ok... what if our original line is length zero from moving in its direction, and the
 // last added segment of the 90 bend we are connected to is zero from moving it in its
 // direction after it was added?
 //
 // If we are moving in original direction, we should lengthen the original drag wire.
 // Otherwise we should lengthen the new wire.
 bool preferOriginalLine = false;
 
 if( foundLine
 && foundLine->GetLength() == 0
 && line->GetLength() == 0
 && EDA_ANGLE( splitDelta ).IsParallelTo( line->GetStoredAngle() ) )
 {
 preferOriginalLine = true;
 }
 // If we have found an attachment, but not a line, we want to check if it's a junction.
 // These are special-cased and get a single line added instead of a 90-degree bend. Except
 // when we're on a pin, because pins always need bends, and junctions are just added to
 // pins for visual clarity.
 else if( !foundLine && foundJunction && !foundPin )
 {
 // Create a new wire ending at the unselected end
 foundLine = new SCH_LINE( unselectedEnd, line->GetLayer() );
 foundLine->SetFlags( IS_NEW );
 foundLine->SetLastResolvedState( line );
 m_frame->AddToScreen( foundLine, m_frame->GetScreen() );
 m_newDragLines.insert( foundLine );
 
 // We just broke off of the existing items, so replace all of them with our new
 // end connection.
 m_lineConnectionCache[foundLine] = m_lineConnectionCache[line];
 m_lineConnectionCache[line].clear();
 m_lineConnectionCache[line].emplace_back( foundLine );
 }
 
 // We want to drag our found line if it's in the same angle as the move or zero length,
 // but if the original drag line is also zero and the same original angle we should extend
 // that one first
 if( foundLine && !preferOriginalLine )
 {
 // Move the connected line found oriented in the direction of our move.
 //
 // Make sure we grab the right endpoint, it's not always STARTPOINT since the user can
 // draw a box of lines. We need to only move one though, and preferably the start point,
 // in case we have a zero length line that we are extending (we want the foundLine
 // start point to be attached to the unselected end of our drag line).
 //
 // Also, new lines are added already so they'll be in the undo list, skip adding them.
 
 if( !foundLine->HasFlag( IS_CHANGED ) && !foundLine->HasFlag( IS_NEW ) )
 {
 aCommit->Modify( (SCH_ITEM*) foundLine, m_frame->GetScreen() );
 
 if( !foundLine->IsSelected() )
 m_changedDragLines.insert( foundLine );
 }
 
 if( foundLine->GetStartPoint() == unselectedEnd )
 foundLine->MoveStart( splitDelta );
 else if( foundLine->GetEndPoint() == unselectedEnd )
 foundLine->MoveEnd( splitDelta );
 
 updateItem( foundLine, true );
 
 SCH_LINE* bendLine = nullptr;
 
 if( m_lineConnectionCache.count( foundLine ) == 1
 && m_lineConnectionCache[foundLine][0]->Type() == SCH_LINE_T )
 {
 bendLine = static_cast<SCH_LINE*>( m_lineConnectionCache[foundLine][0] );
 }
 
 // Remerge segments we've created if this is a segment that we've added whose only
 // other connection is also an added segment
 //
 // bendLine is first added segment at the original attachment point, foundLine is the
 // orthogonal line between bendLine and this line
 if( foundLine->HasFlag( IS_NEW )
 && foundLine->GetLength() == 0
 && bendLine && bendLine->HasFlag( IS_NEW ) )
 {
 if( line->HasFlag( STARTPOINT ) )
 line->SetEndPoint( bendLine->GetEndPoint() );
 else
 line->SetStartPoint( bendLine->GetEndPoint() );
 
 // Update our cache of the connected items.
 
 // First, re-attach our drag labels to the original line being re-merged.
 for( EDA_ITEM* candidate : m_lineConnectionCache[bendLine] )
 {
 SCH_LABEL_BASE* label = dynamic_cast<SCH_LABEL_BASE*>( candidate );
 
 if( label && m_specialCaseLabels.count( label ) )
 m_specialCaseLabels[label].attachedLine = line;
 }
 
 m_lineConnectionCache[line] = m_lineConnectionCache[bendLine];
 m_lineConnectionCache[bendLine].clear();
 m_lineConnectionCache[foundLine].clear();
 
 m_frame->RemoveFromScreen( bendLine, m_frame->GetScreen() );
 m_frame->RemoveFromScreen( foundLine, m_frame->GetScreen() );
 
 m_newDragLines.erase( bendLine );
 m_newDragLines.erase( foundLine );
 
 delete bendLine;
 delete foundLine;
 }
 //Ok, move the unselected end of our item
 else
 {
 if( line->HasFlag( STARTPOINT ) )
 line->MoveEnd( splitDelta );
 else
 line->MoveStart( splitDelta );
 }
 
 updateItem( line, true );
 }
 else if( line->GetLength() == 0 )
 {
 // We didn't find another line to shorten/lengthen, (or we did but it's also zero)
 // so now is a good time to use our existing zero-length original line
 }
 // Either no line was at the "right" angle, or this was a junction, pin, sheet, etc. We
 // need to add segments to keep the soon-to-move unselected end connected to these items.
 //
 // To keep our drag selections all the same, we'll move our unselected end point and then
 // put wires between it and its original endpoint.
 else if( foundAttachment && line->IsOrthogonal() )
 {
 VECTOR2D lineGrid = grid.GetGridSize( grid.GetItemGrid( line ) );
 
 // The bend counter handles a group of wires all needing their offset one grid movement
 // further out from each other to not overlap. The absolute value stuff finds the
 // direction of the line and hence the the bend increment on that axis
 unsigned int xMoveBit = splitDelta.x != 0;
 unsigned int yMoveBit = splitDelta.y != 0;
 int xLength = abs( unselectedEnd.x - selectedEnd.x );
 int yLength = abs( unselectedEnd.y - selectedEnd.y );
 int xMove = ( xLength - ( xBendCount * lineGrid.x ) )
 * sign( selectedEnd.x - unselectedEnd.x );
 int yMove = ( yLength - ( yBendCount * lineGrid.y ) )
 * sign( selectedEnd.y - unselectedEnd.y );
 
 // Create a new wire ending at the unselected end, we'll move the new wire's start
 // point to the unselected end
 SCH_LINE* a = new SCH_LINE( unselectedEnd, line->GetLayer() );
 a->MoveStart( VECTOR2I( xMove, yMove ) );
 a->SetFlags( IS_NEW );
 a->SetConnectivityDirty( true );
 a->SetLastResolvedState( line );
 m_frame->AddToScreen( a, m_frame->GetScreen() );
 m_newDragLines.insert( a );
 
 SCH_LINE* b = new SCH_LINE( a->GetStartPoint(), line->GetLayer() );
 b->MoveStart( VECTOR2I( splitDelta.x, splitDelta.y ) );
 b->SetFlags( IS_NEW | STARTPOINT );
 b->SetConnectivityDirty( true );
 b->SetLastResolvedState( line );
 m_frame->AddToScreen( b, m_frame->GetScreen() );
 m_newDragLines.insert( b );
 
 xBendCount += yMoveBit;
 yBendCount += xMoveBit;
 
 // Ok move the unselected end of our item
 if( line->HasFlag( STARTPOINT ) )
 {
 line->MoveEnd( VECTOR2I( splitDelta.x ? splitDelta.x : xMove,
 splitDelta.y ? splitDelta.y : yMove ) );
 }
 else
 {
 line->MoveStart( VECTOR2I( splitDelta.x ? splitDelta.x : xMove,
 splitDelta.y ? splitDelta.y : yMove ) );
 }
 
 // Update our cache of the connected items. First, attach our drag labels to the line
 // left behind.
 for( EDA_ITEM* candidate : m_lineConnectionCache[line] )
 {
 SCH_LABEL_BASE* label = dynamic_cast<SCH_LABEL_BASE*>( candidate );
 
 if( label && m_specialCaseLabels.count( label ) )
 m_specialCaseLabels[label].attachedLine = a;
 }
 
 // We just broke off of the existing items, so replace all of them with our new end
 // connection.
 m_lineConnectionCache[a] = m_lineConnectionCache[line];
 m_lineConnectionCache[b].emplace_back( a );
 m_lineConnectionCache[line].clear();
 m_lineConnectionCache[line].emplace_back( b );
 }
 // Original line has no attachments, just move the unselected end
 else if( !foundAttachment )
 {
 if( line->HasFlag( STARTPOINT ) )
 line->MoveEnd( splitDelta );
 else
 line->MoveStart( splitDelta );
 }
 }
}
 
 
int SCH_MOVE_TOOL::Main( const TOOL_EVENT& aEvent )
{
 m_isDrag = aEvent.IsAction( &EE_ACTIONS::drag );
 
 if( SCH_COMMIT* commit = dynamic_cast<SCH_COMMIT*>( aEvent.Commit() ) )
 {
 bool isSlice = false;
 
 if( m_isDrag )
 isSlice = aEvent.Parameter<bool>();
 
 wxCHECK( aEvent.SynchronousState(), 0 );
 aEvent.SynchronousState()->store( STS_RUNNING );
 
 if( doMoveSelection( aEvent, commit, isSlice ) )
 aEvent.SynchronousState()->store( STS_FINISHED );
 else
 aEvent.SynchronousState()->store( STS_CANCELLED );
 }
 else
 {
 SCH_COMMIT localCommit( m_toolMgr );
 
 if( doMoveSelection( aEvent, &localCommit, false ) )
 localCommit.Push( m_isDrag ? _( "Drag" ) : _( "Move" ) );
 else
 localCommit.Revert();
 }
 
 return 0;
}
 
 
bool SCH_MOVE_TOOL::doMoveSelection( const TOOL_EVENT& aEvent, SCH_COMMIT* aCommit, bool aIsSlice )
{
 EESCHEMA_SETTINGS* cfg = nullptr;
 
 try
 {
 cfg = Pgm().GetSettingsManager().GetAppSettings<EESCHEMA_SETTINGS>();
 }
 catch( const std::runtime_error& e )
 {
 wxCHECK_MSG( false, false, e.what() );
 }
 
 KIGFX::VIEW_CONTROLS* controls = getViewControls();
 EE_GRID_HELPER grid( m_toolMgr );
 bool wasDragging = m_moveInProgress && m_isDrag;
 
 m_anchorPos.reset();
 
 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.
 aCommit->Revert();
 
 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->PostAction( EE_ACTIONS::restartMove );
 }
 }
 else
 {
 // The tool hotkey is interpreted as a click when already dragging/moving
 m_toolMgr->PostAction( ACTIONS::cursorClick );
 }
 
 return false;
 }
 
 if( m_inMoveTool ) // Must come after m_moveInProgress checks above...
 return false;
 
 REENTRANCY_GUARD guard( &m_inMoveTool );
 
 // 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,
 true );
 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 );
 
 m_frame->PushTool( aEvent );
 
 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( aEvent );
 return false;
 }
 
 bool restore_state = false;
 TOOL_EVENT copy = aEvent;
 TOOL_EVENT* evt = &copy;
 VECTOR2I prevPos;
 GRID_HELPER_GRIDS snapLayer = GRID_CURRENT;
 
 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::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 placingNewItems = sch_item && sch_item->IsNew();
 
 //------------------------------------------------------------------------
 // Setup a drag or a move
 //
 m_dragAdditions.clear();
 m_specialCaseLabels.clear();
 m_specialCaseSheetPins.clear();
 internalPoints.clear();
 clearNewDragLines();
 
 for( SCH_ITEM* it : m_frame->GetScreen()->Items() )
 {
 it->ClearFlags( SELECTED_BY_DRAG );
 
 if( !it->IsSelected() )
 it->ClearFlags( STARTPOINT | ENDPOINT );
 }
 
 // Drag of split items start over top of their other segment so
 // we want to skip grabbing the segments we split from
 if( m_isDrag && !aIsSlice )
 {
 EDA_ITEMS connectedDragItems;
 
 // Add connections to the selection for a drag.
 // Do all non-labels/entries first so we don't add junctions to drag
 // when the line will eventually be drag selected.
 std::vector<SCH_ITEM*> stageTwo;
 
 for( EDA_ITEM* edaItem : selection )
 {
 SCH_ITEM* item = static_cast<SCH_ITEM*>( edaItem );
 std::vector<VECTOR2I> connections;
 
 switch( item->Type() )
 {
 case SCH_LABEL_T:
 case SCH_HIER_LABEL_T:
 case SCH_GLOBAL_LABEL_T:
 case SCH_DIRECTIVE_LABEL_T:
 stageTwo.emplace_back(item);
 break;
 
 case SCH_LINE_T:
 static_cast<SCH_LINE*>( item )->GetSelectedPoints( connections );
 break;
 default:
 connections = item->GetConnectionPoints();
 }
 
 for( const VECTOR2I& point : connections )
 getConnectedDragItems( aCommit, item, point, connectedDragItems );
 }
 
 // Go back and get all label connections now that we can test for drag-selected
 // lines the labels might be on
 for( SCH_ITEM* item : stageTwo )
 {
 for( const VECTOR2I& point : item->GetConnectionPoints() )
 getConnectedDragItems( aCommit, item, point, connectedDragItems );
 }
 
 for( EDA_ITEM* item : connectedDragItems )
 {
 m_dragAdditions.push_back( item->m_Uuid );
 m_selectionTool->AddItemToSel( item, QUIET_MODE );
 }
 
 // Pre-cache all connections of our selected objects so we can keep track of
 // what they were originally connected to as we drag them around
 for( EDA_ITEM* edaItem : selection )
 {
 SCH_ITEM* schItem = static_cast<SCH_ITEM*>( edaItem );
 
 if( schItem->Type() == SCH_LINE_T )
 {
 SCH_LINE* line = static_cast<SCH_LINE*>( schItem );
 
 //Also store the original angle of the line, is needed later to decide
 //which segment to extend when they've become zero length
 line->StoreAngle();
 
 for( const VECTOR2I& point : line->GetConnectionPoints() )
 getConnectedItems( line, point, m_lineConnectionCache[line] );
 }
 }
 }
 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 );
 
 std::vector<DANGLING_END_ITEM> endPointsByType = internalPoints;
 std::vector<DANGLING_END_ITEM> endPointsByPos = endPointsByType;
 DANGLING_END_ITEM_HELPER::sort_dangling_end_items( endPointsByType,
 endPointsByPos );
 
 for( EDA_ITEM* item : selection )
 static_cast<SCH_ITEM*>( item )->UpdateDanglingState( endPointsByType,
 endPointsByPos );
 }
 
 
 // Generic setup
 snapLayer = grid.GetSelectionGrid( selection );
 
 for( EDA_ITEM* item : selection )
 {
 if( item->IsNew() )
 {
 // Item was added to commit in a previous command
 }
 else if( item->GetParent() && item->GetParent()->IsSelected() )
 {
 // Item will be (or has been) added to commit by parent
 }
 else
 {
 aCommit->Modify( item, m_frame->GetScreen() );
 }
 
 item->SetFlags( IS_MOVING );
 
 if( SCH_ITEM* schItem = dynamic_cast<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 );
 
 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;
 
 // We need to check if the movement will change the net offset direction on the
 // X an Y axes. This is because we remerge added bend lines in realtime, and we
 // also account for the direction of the move when adding bend lines. So, if the
 // move direction changes, we need to split it into a move that gets us back to
 // zero, then the rest of the move.
 std::vector<VECTOR2I> splitMoves;
 
 if( alg::signbit( m_moveOffset.x ) != alg::signbit( ( m_moveOffset + delta ).x ) )
 {
 splitMoves.emplace_back( VECTOR2I( -1 * m_moveOffset.x, 0 ) );
 splitMoves.emplace_back( VECTOR2I( delta.x + m_moveOffset.x, 0 ) );
 }
 else
 {
 splitMoves.emplace_back( VECTOR2I( delta.x, 0 ) );
 }
 
 if( alg::signbit( m_moveOffset.y ) != alg::signbit( ( m_moveOffset + delta ).y ) )
 {
 splitMoves.emplace_back( VECTOR2I( 0, -1 * m_moveOffset.y ) );
 splitMoves.emplace_back( VECTOR2I( 0, delta.y + m_moveOffset.y ) );
 }
 else
 {
 splitMoves.emplace_back( VECTOR2I( 0, delta.y ) );
 }
 
 
 m_moveOffset += delta;
 prevPos = m_cursor;
 
 // Used for tracking how far off a drag end should have its 90 degree elbow added
 int xBendCount = 1;
 int yBendCount = 1;
 
 // Split the move into X and Y moves so we can correctly drag orthogonal lines
 for( const VECTOR2I& splitDelta : splitMoves )
 {
 // Skip non-moves
 if( splitDelta == VECTOR2I( 0, 0 ) )
 continue;
 
 for( EDA_ITEM* item : selection.GetItemsSortedByTypeAndXY( ( delta.x >= 0 ),
 ( delta.y >= 0 ) ) )
 {
 // Don't double move pins, fields, etc.
 if( item->GetParent() && item->GetParent()->IsSelected() )
 continue;
 
 SCH_LINE* line = dynamic_cast<SCH_LINE*>( item );
 
 // Only partially selected drag lines in orthogonal line mode need special
 // handling
 if( m_isDrag
 && cfg->m_Drawing.line_mode != LINE_MODE::LINE_MODE_FREE
 && line
 && line->HasFlag( STARTPOINT ) != line->HasFlag( ENDPOINT ) )
 {
 orthoLineDrag( aCommit, line, splitDelta, xBendCount, yBendCount, grid );
 }
 
 // Move all other items normally, including the selected end of partially
 // selected lines
 moveItem( item, splitDelta );
 updateItem( item, false );
 
 // Update any lines connected to sheet pins to the sheet pin's location
 // (which may not exactly follow the splitDelta as the pins are constrained
 // along the sheet edges.
 for( const auto& [pin, lineEnd] : m_specialCaseSheetPins )
 {
 if( lineEnd.second && lineEnd.first->HasFlag( STARTPOINT ) )
 lineEnd.first->SetStartPoint( pin->GetPosition() );
 else if( !lineEnd.second && lineEnd.first->HasFlag( ENDPOINT ) )
 lineEnd.first->SetEndPoint( pin->GetPosition() );
 }
 }
 }
 
 if( selection.HasReferencePoint() )
 selection.SetReferencePoint( selection.GetReferencePoint() + delta );
 
 m_toolMgr->PostEvent( EVENTS::SelectedItemsMoved );
 }
 
 //------------------------------------------------------------------------
 // Handle cancel
 //
 else if( evt->IsCancelInteractive() || evt->IsActivate() )
 {
 if( evt->IsCancelInteractive() )
 m_frame->GetInfoBar()->Dismiss();
 
 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;
 }
 
 clearNewDragLines();
 
 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 ) )
 {
 wxBell();
 }
 else if( evt->IsAction( &EE_ACTIONS::rotateCW ) )
 {
 m_toolMgr->RunSynchronousAction( EE_ACTIONS::rotateCW, aCommit );
 }
 else if( evt->IsAction( &EE_ACTIONS::rotateCCW ) )
 {
 m_toolMgr->RunSynchronousAction( EE_ACTIONS::rotateCCW, aCommit );
 }
 else if( evt->Action() == TA_CHOICE_MENU_CHOICE )
 {
 if( *evt->GetCommandId() >= ID_POPUP_SCH_SELECT_UNIT
 && *evt->GetCommandId() <= ID_POPUP_SCH_SELECT_UNIT_END )
 {
 SCH_SYMBOL* symbol = dynamic_cast<SCH_SYMBOL*>( selection.Front() );
 int unit = *evt->GetCommandId() - ID_POPUP_SCH_SELECT_UNIT;
 
 if( symbol )
 {
 m_frame->SelectUnit( symbol, unit );
 m_toolMgr->PostAction( ACTIONS::refreshPreview );
 }
 }
 }
 else if( evt->IsAction( &EE_ACTIONS::highlightNet )
 || evt->IsAction( &EE_ACTIONS::selectOnPCB ) )
 {
 // These don't make any sense during a move. Eat them.
 }
 //------------------------------------------------------------------------
 // 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
 
 // Create a selection of original selection, drag selected/changed items, and new
 // bend lines for later before we clear them in the aCommit. We'll need these
 // to check for new junctions needed, etc.
 EE_SELECTION selectionCopy( selection );
 
 for( SCH_LINE* line : m_newDragLines )
 selectionCopy.Add( line );
 
 for( SCH_LINE* line : m_changedDragLines )
 selectionCopy.Add( line );
 
 // Save whatever new bend lines and changed lines survived the drag
 for( SCH_LINE* newLine : m_newDragLines )
 {
 newLine->ClearEditFlags();
 aCommit->Added( newLine, m_frame->GetScreen() );
 }
 
 // These lines have been changed, but aren't selected. We need
 // to manually clear these edit flags or they'll stick around.
 for( SCH_LINE* oldLine : m_changedDragLines )
 oldLine->ClearEditFlags();
 
 m_newDragLines.clear();
 m_changedDragLines.clear();
 
 controls->ForceCursorPosition( false );
 controls->ShowCursor( false );
 controls->SetAutoPan( false );
 
 m_moveOffset = { 0, 0 };
 m_anchorPos.reset();
 
 if( restore_state )
 {
 m_selectionTool->RemoveItemsFromSel( &m_dragAdditions, QUIET_MODE );
 }
 else
 {
 // One last update after exiting loop (for slower stuff, such as updating SCREEN's RTree).
 for( EDA_ITEM* item : selection )
 {
 updateItem( item, true );
 
 if( SCH_ITEM* sch_item = dynamic_cast<SCH_ITEM*>( item ) )
 sch_item->SetConnectivityDirty( true );
 }
 
 if( selection.GetSize() == 1 && selection.Front()->IsNew() )
 m_frame->SaveCopyForRepeatItem( static_cast<SCH_ITEM*>( selection.Front() ) );
 
 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( aCommit, m_frame->GetScreen(), it.GetPosition() );
 }
 
 SCH_LINE_WIRE_BUS_TOOL* lwbTool = m_toolMgr->GetTool<SCH_LINE_WIRE_BUS_TOOL>();
 lwbTool->TrimOverLappingWires( aCommit, &selectionCopy );
 lwbTool->AddJunctionsIfNeeded( aCommit, &selectionCopy );
 
 // This needs to run prior to `RecalculateConnections` because we need to identify
 // the lines that are newly dangling
 if( m_isDrag && !aIsSlice )
 trimDanglingLines( aCommit );
 
 // Auto-rotate any moved labels
 for( EDA_ITEM* item : selection )
 m_frame->AutoRotateItem( m_frame->GetScreen(), static_cast<SCH_ITEM*>( item ) );
 
 m_frame->SchematicCleanUp( aCommit );
 }
 
 for( EDA_ITEM* item : m_frame->GetScreen()->Items() )
 item->ClearEditFlags();
 
 // ensure any selected item not in screen main list (for instance symbol fields)
 // has its edit flags cleared
 for( EDA_ITEM* item : selectionCopy )
 item->ClearEditFlags();
 
 if( unselect )
 m_toolMgr->RunAction( EE_ACTIONS::clearSelection );
 else
 m_selectionTool->RebuildSelection(); // Schematic cleanup might have merged lines, etc.
 
 m_dragAdditions.clear();
 m_lineConnectionCache.clear();
 m_moveInProgress = false;
 m_frame->PopTool( aEvent );
 
 return !restore_state;
}
 
 
void SCH_MOVE_TOOL::trimDanglingLines( SCH_COMMIT* aCommit )
{
 // Need a local cleanup first to ensure we remove unneeded junctions
 m_frame->SchematicCleanUp( aCommit, m_frame->GetScreen() );
 
 std::set<SCH_ITEM*> danglers;
 
 std::function<void( SCH_ITEM* )> changeHandler =
 [&]( SCH_ITEM* aChangedItem ) -> void
 {
 m_toolMgr->GetView()->Update( aChangedItem, KIGFX::REPAINT );
 
 // Delete newly dangling lines:
 // Find split segments (one segment is new, the other is changed) that
 // we aren't dragging and don't have selected
 if( aChangedItem->HasFlag( IS_BROKEN) && aChangedItem->IsDangling()
 && !aChangedItem->IsSelected() )
 {
 danglers.insert( aChangedItem );
 }
 };
 
 m_frame->GetScreen()->TestDanglingEnds( nullptr, &changeHandler );
 
 for( SCH_ITEM* line : danglers )
 {
 line->SetFlags( STRUCT_DELETED );
 aCommit->Removed( line, m_frame->GetScreen() );
 
 updateItem( line, false );
 m_frame->RemoveFromScreen( line, m_frame->GetScreen() );
 }
}
 
 
void SCH_MOVE_TOOL::getConnectedItems( SCH_ITEM* aOriginalItem, const VECTOR2I& aPoint,
 EDA_ITEMS& aList )
{
 EE_RTREE& items = m_frame->GetScreen()->Items();
 EE_RTREE::EE_TYPE itemsOverlapping = items.Overlapping( aOriginalItem->GetBoundingBox() );
 SCH_ITEM* foundJunction = nullptr;
 SCH_ITEM* foundSymbol = nullptr;
 
 // If you're connected to a junction, you're only connected to the junction.
 //
 // But, if you're connected to a junction on a pin, you're only connected to the pin. This
 // is because junctions and pins have different logic for how bend lines are generated and
 // we need to prioritize the pin version in some cases.
 for( SCH_ITEM* item : itemsOverlapping )
 {
 if( item != aOriginalItem && item->IsConnected( aPoint ) )
 {
 if( item->Type() == SCH_JUNCTION_T )
 foundJunction = item;
 else if( item->Type() == SCH_SYMBOL_T )
 foundSymbol = item;
 }
 }
 
 if( foundSymbol && foundJunction )
 {
 aList.push_back( foundSymbol );
 return;
 }
 
 if( foundJunction )
 {
 aList.push_back( foundJunction );
 return;
 }
 
 
 for( SCH_ITEM* test : itemsOverlapping )
 {
 if( test == aOriginalItem || !test->CanConnect( aOriginalItem ) )
 continue;
 
 switch( test->Type() )
 {
 case SCH_LINE_T:
 {
 SCH_LINE* line = static_cast<SCH_LINE*>( test );
 
 // When getting lines for the connection cache, it's important that we only add
 // items at the unselected end, since that is the only end that is handled specially.
 // Fully selected lines, and the selected end of a partially selected line, are moved
 // around normally and don't care about their connections.
 if( ( line->HasFlag( STARTPOINT ) && aPoint == line->GetStartPoint() )
 || ( line->HasFlag( ENDPOINT ) && aPoint == line->GetEndPoint() ) )
 {
 continue;
 }
 
 if( test->IsConnected( aPoint ) )
 aList.push_back( test );
 
 // Labels can connect to a wire (or bus) anywhere along the length
 if( SCH_LABEL_BASE* label = dynamic_cast<SCH_LABEL_BASE*>( aOriginalItem ) )
 {
 if( static_cast<SCH_LINE*>( test )->HitTest( label->GetPosition(), 1 ) )
 aList.push_back( test );
 }
 
 break;
 }
 
 case SCH_SHEET_T:
 if( aOriginalItem->Type() == SCH_LINE_T )
 {
 SCH_LINE* line = static_cast<SCH_LINE*>( aOriginalItem );
 
 for( SCH_SHEET_PIN* pin : static_cast<SCH_SHEET*>( test )->GetPins() )
 {
 if( pin->IsConnected( aPoint ) )
 m_specialCaseSheetPins[ pin ] = { line, line->GetStartPoint() == aPoint };
 }
 }
 
 KI_FALLTHROUGH;
 
 case SCH_SYMBOL_T:
 case SCH_JUNCTION_T:
 case SCH_NO_CONNECT_T:
 if( test->IsConnected( aPoint ) )
 aList.push_back( test );
 
 break;
 
 case SCH_LABEL_T:
 case SCH_GLOBAL_LABEL_T:
 case SCH_HIER_LABEL_T:
 case SCH_DIRECTIVE_LABEL_T:
 // Labels can connect to a wire (or bus) anywhere along the length
 if( aOriginalItem->Type() == SCH_LINE_T && test->CanConnect( aOriginalItem ) )
 {
 SCH_LABEL_BASE* label = static_cast<SCH_LABEL_BASE*>( test );
 SCH_LINE* line = static_cast<SCH_LINE*>( aOriginalItem );
 
 if( line->HitTest( label->GetPosition(), 1 ) )
 aList.push_back( label );
 }
 
 break;
 
 case SCH_BUS_WIRE_ENTRY_T:
 case SCH_BUS_BUS_ENTRY_T:
 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 );
 
 if( line->HitTest( aPoint, 1 ) )
 aList.push_back( label );
 }
 
 break;
 
 default:
 break;
 }
 }
}
 
 
void SCH_MOVE_TOOL::getConnectedDragItems( SCH_COMMIT* aCommit, SCH_ITEM* aSelectedItem,
 const VECTOR2I& aPoint, EDA_ITEMS& aList )
{
 EE_RTREE& items = m_frame->GetScreen()->Items();
 EE_RTREE::EE_TYPE itemsOverlappingRTree = items.Overlapping( aSelectedItem->GetBoundingBox() );
 std::vector<SCH_ITEM*> itemsConnectable;
 bool ptHasUnselectedJunction = false;
 
 auto makeNewWire =
 [this]( SCH_COMMIT* commit, SCH_ITEM* fixed, SCH_ITEM* selected, const VECTOR2I& start,
 const VECTOR2I& end )
 {
 SCH_LINE* newWire;
 
 // Add a new newWire between the fixed item and the selected item so the selected
 // item can be dragged.
 if( fixed->GetLayer() == LAYER_BUS_JUNCTION || fixed->GetLayer() == LAYER_BUS
 || selected->GetLayer() == LAYER_BUS )
 {
 newWire = new SCH_LINE( start, LAYER_BUS );
 }
 else
 {
 newWire = new SCH_LINE( start, LAYER_WIRE );
 }
 
 newWire->SetFlags( IS_NEW );
 newWire->SetConnectivityDirty( true );
 
 if( dynamic_cast<const SCH_LINE*>( selected ) )
 newWire->SetLastResolvedState( selected );
 else if( dynamic_cast<const SCH_LINE*>( fixed ) )
 newWire->SetLastResolvedState( fixed );
 
 newWire->SetEndPoint( end );
 m_frame->AddToScreen( newWire, m_frame->GetScreen() );
 commit->Added( newWire, m_frame->GetScreen() );
 
 return newWire;
 };
 
 auto makeNewJunction =
 [this]( SCH_COMMIT* commit, SCH_LINE* line, const VECTOR2I& pt )
 {
 SCH_JUNCTION* junction = new SCH_JUNCTION( pt );
 junction->SetFlags( IS_NEW );
 junction->SetConnectivityDirty( true );
 junction->SetLastResolvedState( line );
 
 if( line->IsBus() )
 junction->SetLayer( LAYER_BUS_JUNCTION );
 
 m_frame->AddToScreen( junction, m_frame->GetScreen() );
 commit->Added( junction, m_frame->GetScreen() );
 
 return junction;
 };
 
 for( SCH_ITEM* item : itemsOverlappingRTree )
 {
 // Skip ourselves, skip already selected items (but not lines, they need both ends tested)
 // and skip unconnectable items
 if( item == aSelectedItem || ( item->Type() != SCH_LINE_T && item->IsSelected() )
 || !item->CanConnect( aSelectedItem ) )
 {
 continue;
 }
 
 itemsConnectable.push_back( item );
 }
 
 for( SCH_ITEM* item : itemsConnectable )
 {
 if( item->Type() == SCH_JUNCTION_T && item->IsConnected( aPoint ) && !item->IsSelected() )
 {
 ptHasUnselectedJunction = true;
 break;
 }
 }
 
 SCH_LINE* newWire = nullptr;
 
 for( SCH_ITEM* test : itemsConnectable )
 {
 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 )
 {
 // It's possible to manually select one end of a line and get a drag
 // connected other end, so we set the flag and then early exit the loop
 // later if the other drag items like labels attached to the line have
 // already been grabbed during the partial selection process.
 line->SetFlags( STARTPOINT );
 
 if( line->HasFlag( SELECTED ) || line->HasFlag( SELECTED_BY_DRAG ) )
 {
 continue;
 }
 else
 {
 line->SetFlags( SELECTED_BY_DRAG );
 aList.push_back( line );
 }
 }
 else if( line->GetEndPoint() == aPoint )
 {
 line->SetFlags( ENDPOINT );
 
 if( line->HasFlag( SELECTED ) || line->HasFlag( SELECTED_BY_DRAG ) )
 {
 continue;
 }
 else
 {
 line->SetFlags( SELECTED_BY_DRAG );
 aList.push_back( line );
 }
 }
 else
 {
 switch( aSelectedItem->Type() )
 {
 // These items can connect anywhere along a line
 case SCH_BUS_BUS_ENTRY_T:
 case SCH_BUS_WIRE_ENTRY_T:
 case SCH_LABEL_T:
 case SCH_HIER_LABEL_T:
 case SCH_GLOBAL_LABEL_T:
 case SCH_DIRECTIVE_LABEL_T:
 // Only add a line if this line is unselected; if the label and line are both
 // selected they'll move together
 if( line->HitTest( aPoint, 1 ) && !line->HasFlag( SELECTED )
 && !line->HasFlag( SELECTED_BY_DRAG ) )
 {
 newWire = makeNewWire( aCommit, line, aSelectedItem, aPoint, aPoint );
 newWire->SetFlags( SELECTED_BY_DRAG | STARTPOINT );
 newWire->StoreAngle( ( line->Angle() + ANGLE_90 ).Normalize() );
 aList.push_back( newWire );
 
 if( aPoint != line->GetStartPoint() && aPoint != line->GetEndPoint() )
 {
 // Split line in half
 if( !line->IsNew() )
 aCommit->Modify( line, m_frame->GetScreen() );
 
 VECTOR2I oldEnd = line->GetEndPoint();
 line->SetEndPoint( aPoint );
 
 makeNewWire( aCommit, line, line, aPoint, oldEnd );
 makeNewJunction( aCommit, line, aPoint );
 }
 else
 {
 m_lineConnectionCache[ newWire ] = { line };
 m_lineConnectionCache[ line ] = { newWire };
 }
 }
 break;
 
 default:
 break;
 }
 
 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 : items.Overlapping( line->GetBoundingBox() ) )
 {
 SCH_LABEL_BASE* label = dynamic_cast<SCH_LABEL_BASE*>( item );
 
 if( !label || label->IsSelected() )
 continue; // These will be moved on their own because they're selected
 
 if( label->HasFlag( SELECTED_BY_DRAG ) )
 continue;
 
 if( label->CanConnect( line ) && line->HitTest( label->GetPosition(), 1 ) )
 {
 label->SetFlags( SELECTED_BY_DRAG );
 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:
 for( SCH_SHEET_PIN* pin : static_cast<SCH_SHEET*>( test )->GetPins() )
 {
 if( pin->IsConnected( aPoint ) )
 {
 if( pin->IsSelected() && aSelectedItem->Type() == SCH_LINE_T )
 {
 SCH_LINE* line = static_cast<SCH_LINE*>( aSelectedItem );
 m_specialCaseSheetPins[ pin ] = { line, line->GetStartPoint() == aPoint };
 }
 else if( !newWire )
 {
 // Add a new wire between the sheetpin and the selected item so the
 // selected item can be dragged.
 newWire = makeNewWire( aCommit, pin, aSelectedItem, aPoint, aPoint );
 newWire->SetFlags( SELECTED_BY_DRAG | STARTPOINT );
 aList.push_back( newWire );
 }
 }
 }
 
 break;
 
 case SCH_SYMBOL_T:
 case SCH_JUNCTION_T:
 if( test->IsConnected( aPoint ) && !newWire )
 {
 // Add a new wire between the symbol or junction and the selected item so
 // the selected item can be dragged.
 newWire = makeNewWire( aCommit, test, aSelectedItem, aPoint, aPoint );
 newWire->SetFlags( SELECTED_BY_DRAG | STARTPOINT );
 aList.push_back( newWire );
 }
 
 break;
 
 case SCH_NO_CONNECT_T:
 // Select no-connects that are connected to items being moved.
 if( !test->HasFlag( SELECTED_BY_DRAG ) && test->IsConnected( aPoint ) )
 {
 aList.push_back( test );
 test->SetFlags( SELECTED_BY_DRAG );
 }
 
 break;
 
 case SCH_LABEL_T:
 case SCH_GLOBAL_LABEL_T:
 case SCH_HIER_LABEL_T:
 case SCH_DIRECTIVE_LABEL_T:
 // Performance optimization:
 if( test->HasFlag( SELECTED_BY_DRAG ) )
 break;
 
 // Select labels that are connected to a wire (or bus) being moved.
 if( aSelectedItem->Type() == SCH_LINE_T && test->CanConnect( aSelectedItem ) )
 {
 SCH_LABEL_BASE* label = static_cast<SCH_LABEL_BASE*>( test );
 SCH_LINE* line = static_cast<SCH_LINE*>( aSelectedItem );
 
 bool oneEndFixed = !line->HasFlag( STARTPOINT ) || !line->HasFlag( ENDPOINT );
 
 if( line->HitTest( label->GetTextPos(), 1 ) )
 {
 if( ( !line->HasFlag( STARTPOINT )
 && label->GetPosition() == line->GetStartPoint() )
 || ( !line->HasFlag( ENDPOINT )
 && label->GetPosition() == line->GetEndPoint() ) )
 {
 //If we have a line selected at only one end, don't grab labels
 //connected directly to the unselected endpoint
 break;
 }
 else
 {
 label->SetFlags( SELECTED_BY_DRAG );
 aList.push_back( label );
 
 if( oneEndFixed )
 {
 SPECIAL_CASE_LABEL_INFO info;
 info.attachedLine = line;
 info.originalLabelPos = label->GetPosition();
 m_specialCaseLabels[label] = info;
 }
 }
 }
 }
 else if( test->IsConnected( aPoint ) && !newWire )
 {
 // Add a new wire between the label and the selected item so the selected item
 // can be dragged.
 newWire = makeNewWire( aCommit, test, aSelectedItem, aPoint, aPoint );
 newWire->SetFlags( SELECTED_BY_DRAG | STARTPOINT );
 aList.push_back( newWire );
 }
 
 break;
 
 case SCH_BUS_WIRE_ENTRY_T:
 case SCH_BUS_BUS_ENTRY_T:
 // Performance optimization:
 if( test->HasFlag( SELECTED_BY_DRAG ) )
 break;
 
 // Select bus entries that are connected to a bus being moved.
 if( aSelectedItem->Type() == SCH_LINE_T && test->CanConnect( aSelectedItem ) )
 {
 SCH_LINE* line = static_cast<SCH_LINE*>( aSelectedItem );
 
 if( ( !line->HasFlag( STARTPOINT ) && test->IsConnected( line->GetStartPoint() ) )
 || ( !line->HasFlag( ENDPOINT ) && test->IsConnected( line->GetEndPoint() ) ) )
 {
 // If we have a line selected at only one end, don't grab bus entries
 // connected directly to the unselected endpoint
 continue;
 }
 
 for( VECTOR2I& point : test->GetConnectionPoints() )
 {
 if( line->HitTest( point, 1 ) )
 {
 test->SetFlags( SELECTED_BY_DRAG );
 aList.push_back( test );
 
 // A bus entry needs its wire & label as well
 std::vector<VECTOR2I> ends = test->GetConnectionPoints();
 VECTOR2I otherEnd;
 
 if( ends[0] == point )
 otherEnd = ends[1];
 else
 otherEnd = ends[0];
 
 getConnectedDragItems( aCommit, 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 ) || !m_isDrag )
 line->MoveStart( aDelta );
 
 if( aItem->HasFlag( ENDPOINT ) || !m_isDrag )
 line->MoveEnd( aDelta );
 
 break;
 }
 
 case SCH_PIN_T:
 case SCH_FIELD_T:
 {
 SCH_ITEM* parent = (SCH_ITEM*) aItem->GetParent();
 VECTOR2I 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() + aDelta );
 pin->ConstrainOnEdge( pin->GetStoredPos(), true );
 break;
 }
 
 case SCH_LABEL_T:
 case SCH_DIRECTIVE_LABEL_T:
 case SCH_GLOBAL_LABEL_T:
 case SCH_HIER_LABEL_T:
 {
 SCH_LABEL_BASE* label = static_cast<SCH_LABEL_BASE*>( aItem );
 
 if( m_specialCaseLabels.count( label ) )
 {
 SPECIAL_CASE_LABEL_INFO info = m_specialCaseLabels[ label ];
 SEG currentLine( info.attachedLine->GetStartPoint(), info.attachedLine->GetEndPoint() );
 label->SetPosition( currentLine.NearestPoint( info.originalLabelPos ) );
 }
 else
 {
 label->Move( aDelta );
 }
 
 break;
 }
 
 default:
 static_cast<SCH_ITEM*>( aItem )->Move( aDelta );
 break;
 }
 
 aItem->SetFlags( IS_MOVING );
}
 
 
int SCH_MOVE_TOOL::AlignToGrid( const TOOL_EVENT& aEvent )
{
 EE_GRID_HELPER grid( m_toolMgr);
 EE_SELECTION& selection = m_selectionTool->RequestSelection( EE_COLLECTOR::MovableItems );
 GRID_HELPER_GRIDS selectionGrid = grid.GetSelectionGrid( selection );
 SCH_COMMIT commit( m_toolMgr );
 
 auto doMoveItem =
 [&]( EDA_ITEM* item, const VECTOR2I& delta )
 {
 commit.Modify( item, m_frame->GetScreen() );
 
 // Ensure only one end is moved when calling moveItem
 // i.e. we are in drag mode
 bool tmp_isDrag = m_isDrag;
 m_isDrag = true;
 moveItem( item, delta );
 m_isDrag = tmp_isDrag;
 
 item->ClearFlags( IS_MOVING );
 updateItem( item, true );
 };
 
 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<VECTOR2I> 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( &commit, line, pts[ii], drag_items );
 std::set<EDA_ITEM*> unique_items( drag_items.begin(), drag_items.end() );
 
 VECTOR2I delta = grid.AlignGrid( pts[ii], selectionGrid ) - pts[ii];
 
 if( delta != VECTOR2I( 0, 0 ) )
 {
 for( EDA_ITEM* dragItem : unique_items )
 {
 if( dragItem->GetParent() && dragItem->GetParent()->IsSelected() )
 continue;
 
 doMoveItem( dragItem, delta );
 }
 }
 }
 }
 else if( item->Type() == SCH_FIELD_T || item->Type() == SCH_TEXT_T )
 {
 VECTOR2I delta = grid.AlignGrid( item->GetPosition(), selectionGrid ) - item->GetPosition();
 
 if( delta != VECTOR2I( 0, 0 ) )
 doMoveItem( item, delta );
 }
 else if( item->Type() == SCH_SHEET_T )
 {
 SCH_SHEET* sheet = static_cast<SCH_SHEET*>( item );
 VECTOR2I topLeft = sheet->GetPosition();
 VECTOR2I bottomRight = topLeft + sheet->GetSize();
 VECTOR2I tl_delta = grid.AlignGrid( topLeft, selectionGrid ) - topLeft;
 VECTOR2I br_delta = grid.AlignGrid( bottomRight, selectionGrid ) - bottomRight;
 
 if( tl_delta != VECTOR2I( 0, 0 ) || br_delta != VECTOR2I( 0, 0 ) )
 {
 doMoveItem( sheet, tl_delta );
 
 VECTOR2I newSize = (VECTOR2I) sheet->GetSize() - tl_delta + br_delta;
 sheet->SetSize( VECTOR2I( newSize.x, newSize.y ) );
 updateItem( sheet, true );
 }
 
 for( SCH_SHEET_PIN* pin : sheet->GetPins() )
 {
 VECTOR2I newPos;
 
 if( pin->GetSide() == SHEET_SIDE::TOP || pin->GetSide() == SHEET_SIDE::LEFT )
 newPos = pin->GetPosition() + tl_delta;
 else
 newPos = pin->GetPosition() + br_delta;
 
 VECTOR2I delta = grid.AlignGrid( newPos - pin->GetPosition(), selectionGrid );
 
 if( delta != VECTOR2I( 0, 0 ) )
 {
 EDA_ITEMS drag_items;
 getConnectedDragItems( &commit, pin, pin->GetConnectionPoints()[0],
 drag_items );
 
 doMoveItem( pin, delta );
 
 for( EDA_ITEM* dragItem : drag_items )
 {
 if( dragItem->GetParent() && dragItem->GetParent()->IsSelected() )
 continue;
 
 doMoveItem( dragItem, delta );
 }
 }
 }
 }
 else
 {
 SCH_ITEM* schItem = static_cast<SCH_ITEM*>( item );
 std::vector<VECTOR2I> connections = schItem->GetConnectionPoints();
 EDA_ITEMS drag_items;
 
 for( const VECTOR2I& point : connections )
 getConnectedDragItems( &commit, schItem, point, drag_items );
 
 std::map<VECTOR2I, int> shifts;
 VECTOR2I most_common( 0, 0 );
 int max_count = 0;
 
 for( const VECTOR2I& conn : connections )
 {
 VECTOR2I gridpt = grid.AlignGrid( conn, selectionGrid ) - conn;
 
 shifts[gridpt]++;
 
 if( shifts[gridpt] > max_count )
 {
 most_common = gridpt;
 max_count = shifts[most_common];
 }
 }
 
 if( most_common != VECTOR2I( 0, 0 ) )
 {
 doMoveItem( item, most_common );
 
 for( EDA_ITEM* dragItem : drag_items )
 {
 if( dragItem->GetParent() && dragItem->GetParent()->IsSelected() )
 continue;
 
 doMoveItem( dragItem, most_common );
 }
 }
 }
 }
 
 SCH_LINE_WIRE_BUS_TOOL* lwbTool = m_toolMgr->GetTool<SCH_LINE_WIRE_BUS_TOOL>();
 lwbTool->TrimOverLappingWires( &commit, &selection );
 lwbTool->AddJunctionsIfNeeded( &commit, &selection );
 
 m_toolMgr->PostEvent( EVENTS::SelectedItemsMoved );
 
 m_frame->SchematicCleanUp( &commit );
 commit.Push( _( "Align Items to Grid" ) );
 return 0;
}
 
 
void SCH_MOVE_TOOL::clearNewDragLines()
{
 // Remove new bend lines added during the drag
 for( SCH_LINE* newLine : m_newDragLines )
 {
 m_frame->RemoveFromScreen( newLine, m_frame->GetScreen() );
 delete newLine;
 }
 
 m_newDragLines.clear();
}
 
 
void SCH_MOVE_TOOL::setTransitions()
{
 Go( &SCH_MOVE_TOOL::Main, EE_ACTIONS::move.MakeEvent() );
 Go( &SCH_MOVE_TOOL::Main, EE_ACTIONS::drag.MakeEvent() );
 Go( &SCH_MOVE_TOOL::AlignToGrid, EE_ACTIONS::alignToGrid.MakeEvent() );
}