/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2013-2017 CERN
 * Copyright (C) 2017-2022 KiCad Developers, see AUTHORS.txt for contributors.
 * @author Maciej Suminski <maciej.suminski@cern.ch>
 * @author Tomasz Wlostowski <tomasz.wlostowski@cern.ch>
 *
 * 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 <advanced_config.h>
#include <limits>
#include <board.h>
#include <board_design_settings.h>
#include <footprint.h>
#include <fp_shape.h>
#include <collectors.h>
#include <pcb_edit_frame.h>
#include <drawing_sheet/ds_proxy_view_item.h>
#include <kiway.h>
#include <pcbnew_settings.h>
#include <spread_footprints.h>
#include <tools/pcb_actions.h>
#include <tools/pcb_selection_tool.h>
#include <tools/edit_tool.h>
#include <tools/pcb_grid_helper.h>
#include <tools/drc_tool.h>
#include <tools/drawing_tool.h>
#include <view/view_controls.h>
#include <connectivity/connectivity_algo.h>
#include <connectivity/connectivity_items.h>
#include <cassert>
#include <functional>
#include <wx/hyperlink.h>
#include <router/router_tool.h>
#include <dialogs/dialog_move_exact.h>
#include <dialogs/dialog_unit_entry.h>
#include <board_commit.h>
#include <pcb_group.h>
#include <pcb_target.h>
#include <zone_filler.h>
#include <drc/drc_engine.h>
#include <drc/drc_item.h>
#include <drc/drc_rule.h>
#include <pad.h>
#include <geometry/shape_segment.h>
#include <drc/drc_interactive_courtyard_clearance.h>


int EDIT_TOOL::Swap( const TOOL_EVENT& aEvent )
{
    if( isRouterActive() || m_dragging )
    {
        wxBell();
        return 0;
    }

    PCB_SELECTION& selection = m_selectionTool->RequestSelection(
            []( const VECTOR2I& aPt, GENERAL_COLLECTOR& aCollector, PCB_SELECTION_TOOL* sTool )
            {
                sTool->FilterCollectorForMarkers( aCollector );
                sTool->FilterCollectorForHierarchy( aCollector, true );
                sTool->FilterCollectorForFreePads( aCollector );

                // Iterate from the back so we don't have to worry about removals.
                for( int i = aCollector.GetCount() - 1; i >= 0; --i )
                {
                    BOARD_ITEM* item = aCollector[i];

                    switch( item->Type() )
                    {
                    case PCB_TRACE_T: aCollector.Remove( item ); break;

                    default: break;
                    }
                }
            },
            true /* prompt user regarding locked items */ );

    if( selection.Size() < 2 )
        return 0;

    std::vector<EDA_ITEM*> sorted = selection.GetItemsSortedBySelectionOrder();

    // When editing footprints, all items have the same parent
    if( IsFootprintEditor() )
    {
        m_commit->Modify( selection.Front() );
    }
    else
    {
        // Save items, so changes can be undone
        for( EDA_ITEM* item : selection )
        {
            // Don't double move footprint pads, fields, etc.
            //
            // For PCB_GROUP_T, the parent is the board.
            if( item->GetParent() && item->GetParent()->IsSelected() )
                continue;

            m_commit->Modify( item );

            // If moving a group, record position of all the descendants for undo
            if( item->Type() == PCB_GROUP_T )
            {
                PCB_GROUP* group = static_cast<PCB_GROUP*>( item );
                group->RunOnDescendants( [&]( BOARD_ITEM* bItem )
                                         {
                                             m_commit->Modify( bItem );
                                         });
            }
        }
    }

    for( size_t i = 0; i < sorted.size() - 1; i++ )
    {
        BOARD_ITEM* a = static_cast<BOARD_ITEM*>( sorted[i] );
        BOARD_ITEM* b = static_cast<BOARD_ITEM*>( sorted[( i + 1 ) % sorted.size()] );

        // Swap X,Y position
        VECTOR2I aPos = a->GetPosition(), bPos = b->GetPosition();
        std::swap( aPos, bPos );
        a->SetPosition( aPos );
        b->SetPosition( bPos );

        // Pads need special handling to keep their offset from their parent
        if( a->Type() == PCB_PAD_T )
            static_cast<PAD*>( a )->SetLocalCoord();

        if( b->Type() == PCB_PAD_T )
            static_cast<PAD*>( b )->SetLocalCoord();

        // Handle footprints specially. They can be flipped to the back of the board which
        // requires a special transformation.
        if( a->Type() == PCB_FOOTPRINT_T && b->Type() == PCB_FOOTPRINT_T )
        {
            FOOTPRINT* aFP = static_cast<FOOTPRINT*>( a );
            FOOTPRINT* bFP = static_cast<FOOTPRINT*>( b );

            // Flip both if needed
            if( aFP->IsFlipped() != bFP->IsFlipped() )
            {
                aFP->Flip( aPos, false );
                bFP->Flip( bPos, false );
            }

            // Set orientation
            EDA_ANGLE aAngle = aFP->GetOrientation(), bAngle = bFP->GetOrientation();
            std::swap( aAngle, bAngle );
            aFP->SetOrientation( aAngle );
            bFP->SetOrientation( bAngle );
        }
        // We can also do a layer swap safely for two objects of the same type,
        // except groups which don't support layer swaps.
        else if( a->Type() == b->Type() && a->Type() != PCB_GROUP_T )
        {
            // Swap layers
            PCB_LAYER_ID aLayer = a->GetLayer(), bLayer = b->GetLayer();
            std::swap( aLayer, bLayer );
            a->SetLayer( aLayer );
            b->SetLayer( bLayer );
        }
    }

    m_commit->Push( _( "Swap" ) );

    m_toolMgr->ProcessEvent( EVENTS::SelectedItemsModified );

    return 0;
}


int EDIT_TOOL::PackAndMoveFootprints( const TOOL_EVENT& aEvent )
{
    PCB_BASE_EDIT_FRAME* editFrame = getEditFrame<PCB_BASE_EDIT_FRAME>();

    PCB_SELECTION& selection = m_selectionTool->RequestSelection(
            []( const VECTOR2I& aPt, GENERAL_COLLECTOR& aCollector, PCB_SELECTION_TOOL* sTool )
            {
                // Iterate from the back so we don't have to worry about removals.
                for( int i = aCollector.GetCount() - 1; i >= 0; --i )
                {
                    BOARD_ITEM* item = aCollector[i];

                    if( !dynamic_cast<FOOTPRINT*>( item ) )
                        aCollector.Remove( item );
                }
            },
            true /* prompt user regarding locked items */ );

    std::vector<FOOTPRINT*> footprintsToPack;

    for( EDA_ITEM* item : selection )
        footprintsToPack.push_back( static_cast<FOOTPRINT*>( item ) );

    if( footprintsToPack.empty() )
        return 0;

    BOARD_COMMIT commit( editFrame );
    BOX2I        footprintsBbox;

    for( FOOTPRINT* item : footprintsToPack )
    {
        commit.Modify( item );
        footprintsBbox.Merge( item->GetBoundingBox( false, false ) );
    }

    SpreadFootprints( &footprintsToPack, footprintsBbox.Normalize().GetOrigin(), false );

    commit.Push( _( "Pack footprints" ) );

    return doMoveSelection( aEvent );
}


int EDIT_TOOL::Move( const TOOL_EVENT& aEvent )
{
    if( isRouterActive() )
    {
        wxBell();
        return 0;
    }

    return doMoveSelection( aEvent );
}


int EDIT_TOOL::MoveIndividually( const TOOL_EVENT& aEvent )
{
    PCB_SELECTION_TOOL* selTool = m_toolMgr->GetTool<PCB_SELECTION_TOOL>();

    if( isRouterActive() )
    {
        wxBell();
        return 0;
    }

    EDA_ITEMS sortedItems = selTool->GetSelection().GetItemsSortedBySelectionOrder();

    if( sortedItems.size() == 0 )
        return 0;

    for( EDA_ITEM* item : sortedItems )
    {
        selTool->ClearSelection();
        selTool->AddItemToSel( item );
        doMoveSelection( aEvent );
    }

    selTool->AddItemsToSel( &sortedItems );

    return 0;
}


int EDIT_TOOL::MoveWithReference( const TOOL_EVENT& aEvent )
{
    if( isRouterActive() )
    {
        wxBell();
        return 0;
    }

    return doMoveSelection( aEvent, true );
}


VECTOR2I EDIT_TOOL::getSafeMovement( const VECTOR2I& aMovement, const BOX2I& aSourceBBox,
                                     const VECTOR2D& aBBoxOffset )
{
    typedef std::numeric_limits<int> coord_limits;

    int max = coord_limits::max();
    int min = -max;

    double left = aBBoxOffset.x + aSourceBBox.GetPosition().x;
    double top = aBBoxOffset.y + aSourceBBox.GetPosition().y;

    double right = left + aSourceBBox.GetSize().x;
    double bottom = top + aSourceBBox.GetSize().y;

    // Do not restrict movement if bounding box is already out of bounds
    if( left < min || top < min || right > max || bottom > max )
        return aMovement;

    // Constrain moving bounding box to coordinates limits
    VECTOR2D tryMovement( aMovement );
    VECTOR2D bBoxOrigin( aSourceBBox.GetPosition() + aBBoxOffset );
    VECTOR2D clampedBBoxOrigin = GetClampedCoords( bBoxOrigin + tryMovement, COORDS_PADDING );

    tryMovement = clampedBBoxOrigin - bBoxOrigin;

    VECTOR2D bBoxEnd( aSourceBBox.GetEnd() + aBBoxOffset );
    VECTOR2D clampedBBoxEnd = GetClampedCoords( bBoxEnd + tryMovement, COORDS_PADDING );

    tryMovement = clampedBBoxEnd - bBoxEnd;

    return GetClampedCoords<double, int>( tryMovement );
}


int EDIT_TOOL::doMoveSelection( const TOOL_EVENT& aEvent, bool aPickReference )
{
    PCB_BASE_EDIT_FRAME*  editFrame = getEditFrame<PCB_BASE_EDIT_FRAME>();
    PCBNEW_SETTINGS*      cfg = editFrame->GetPcbNewSettings();
    BOARD*                board = editFrame->GetBoard();
    KIGFX::VIEW_CONTROLS* controls  = getViewControls();
    VECTOR2I              originalCursorPos = controls->GetCursorPosition();

    // Be sure that there is at least one item that we can modify. If nothing was selected before,
    // try looking for the stuff under mouse cursor (i.e. KiCad old-style hover selection)
    PCB_SELECTION& selection = m_selectionTool->RequestSelection(
            []( const VECTOR2I& aPt, GENERAL_COLLECTOR& aCollector, PCB_SELECTION_TOOL* sTool )
            {
                sTool->FilterCollectorForMarkers( aCollector );
                sTool->FilterCollectorForHierarchy( aCollector, true );
            },
            // Prompt user regarding locked items if in board editor and in free-pad-mode (if
            // we're not in free-pad mode we delay this until the second RequestSelection()).
            !m_isFootprintEditor && cfg->m_AllowFreePads );

    if( m_dragging || selection.Empty() )
        return 0;

    LSET     item_layers = selection.GetSelectionLayers();
    bool     is_hover    = selection.IsHover(); // N.B. This must be saved before the second call
                                                // to RequestSelection() below
    VECTOR2I pickedReferencePoint;

    // Now filter out pads if not in free pads mode.  We cannot do this in the first
    // RequestSelection() as we need the item_layers when a pad is the selection front.
    if( !m_isFootprintEditor && !cfg->m_AllowFreePads )
    {
        selection = m_selectionTool->RequestSelection(
                []( const VECTOR2I& aPt, GENERAL_COLLECTOR& aCollector, PCB_SELECTION_TOOL* sTool )
                {
                    sTool->FilterCollectorForMarkers( aCollector );
                    sTool->FilterCollectorForHierarchy( aCollector, true );
                    sTool->FilterCollectorForFreePads( aCollector );
                },
                true /* prompt user regarding locked items */ );
    }

    if( selection.Empty() )
        return 0;

    editFrame->PushTool( aEvent );

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

    if( aPickReference && !pickReferencePoint( _( "Select reference point for move..." ), "", "",
                                               pickedReferencePoint ) )
    {
        if( is_hover )
            m_toolMgr->RunAction( PCB_ACTIONS::selectionClear, true );

        editFrame->PopTool( aEvent );
        return 0;
    }

    auto displayConstraintsMessage =
            [editFrame]( bool constrained )
            {
                editFrame->DisplayConstraintsMsg( constrained ? _( "Constrain to H, V, 45" )
                                                              : wxT( "" ) );
            };

    std::vector<BOARD_ITEM*> sel_items;         // All the items operated on by the move below
    std::vector<BOARD_ITEM*> orig_items;        // All the original items in the selection

    for( EDA_ITEM* item : selection )
    {
        BOARD_ITEM* boardItem = dynamic_cast<BOARD_ITEM*>( item );
        FOOTPRINT*  footprint = dynamic_cast<FOOTPRINT*>( item );

        if( boardItem )
        {
            if( !is_hover )
                orig_items.push_back( boardItem );

            sel_items.push_back( boardItem );
        }

        if( footprint )
        {
            for( PAD* pad : footprint->Pads() )
                sel_items.push_back( pad );

            // Clear this flag here; it will be set by the netlist updater if the footprint is new
            // so that it was skipped in the initial connectivity update in OnNetlistChanged
            footprint->SetAttributes( footprint->GetAttributes() & ~FP_JUST_ADDED );
        }
    }

    bool            restore_state = false;
    VECTOR2I        originalPos;
    VECTOR2I        totalMovement;
    VECTOR2D        bboxMovement;
    BOX2I           originalBBox;
    bool            updateBBox = true;
    PCB_GRID_HELPER grid( m_toolMgr, editFrame->GetMagneticItemsSettings() );
    TOOL_EVENT      copy = aEvent;
    TOOL_EVENT*     evt = &copy;
    VECTOR2I        prevPos;

    bool hv45Mode        = false;
    bool eatFirstMouseUp = true;
    bool hasRedrawn3D    = false;
    bool allowRedraw3D   = cfg->m_Display.m_Live3DRefresh;
    bool showCourtyardConflicts = !m_isFootprintEditor && cfg->m_ShowCourtyardCollisions;

    // Used to test courtyard overlaps
    std::unique_ptr<DRC_INTERACTIVE_COURTYARD_CLEARANCE> drc_on_move = nullptr;

    if( showCourtyardConflicts )
    {
        std::shared_ptr<DRC_ENGINE> drcEngine = m_toolMgr->GetTool<DRC_TOOL>()->GetDRCEngine();
        drc_on_move.reset( new DRC_INTERACTIVE_COURTYARD_CLEARANCE( drcEngine ) );
        drc_on_move->Init( board );
    }

    displayConstraintsMessage( hv45Mode );

    // Prime the pump
    m_toolMgr->RunAction( ACTIONS::refreshPreview );

    // Main loop: keep receiving events
    do
    {
        VECTOR2I movement;
        editFrame->GetCanvas()->SetCurrentCursor( KICURSOR::MOVING );
        grid.SetSnap( !evt->Modifier( MD_SHIFT ) );
        grid.SetUseGrid( getView()->GetGAL()->GetGridSnapping() && !evt->DisableGridSnapping() );

        if( evt->IsMotion() || evt->IsDrag( BUT_LEFT ) )
            eatFirstMouseUp = false;

        if( evt->IsAction( &PCB_ACTIONS::move ) || evt->IsMotion() || evt->IsDrag( BUT_LEFT )
                || evt->IsAction( &ACTIONS::refreshPreview )
                || evt->IsAction( &PCB_ACTIONS::moveWithReference )
                || evt->IsAction( &PCB_ACTIONS::moveIndividually ) )
        {
            if( m_dragging && evt->Category() == TC_MOUSE )
            {
                bool redraw3D = false;

                VECTOR2I mousePos( controls->GetMousePosition() );

                m_cursor = grid.BestSnapAnchor( mousePos, item_layers, sel_items );

                if( controls->GetSettings().m_lastKeyboardCursorPositionValid )
                {
                    long action = controls->GetSettings().m_lastKeyboardCursorCommand;

                    // The arrow keys are by definition SINGLE AXIS.  Do not allow the other
                    // axis to be snapped to the grid.
                    if( action == ACTIONS::CURSOR_LEFT || action == ACTIONS::CURSOR_RIGHT )
                        m_cursor.y = prevPos.y;
                    else if( action == ACTIONS::CURSOR_UP || action == ACTIONS::CURSOR_DOWN )
                        m_cursor.x = prevPos.x;
                }

                if( !selection.HasReferencePoint() )
                    originalPos = m_cursor;

                if( hv45Mode )
                {
                    VECTOR2I moveVector = m_cursor - originalPos;
                    m_cursor = originalPos + GetVectorSnapped45( moveVector );
                }

                if( updateBBox )
                {
                    originalBBox = BOX2I();
                    bboxMovement = VECTOR2D();

                    for( EDA_ITEM* item : sel_items )
                    {
                        BOX2I viewBBOX = item->ViewBBox();

                        if( originalBBox.GetWidth() == 0 && originalBBox.GetHeight() == 0 )
                            originalBBox = viewBBOX;
                        else
                            originalBBox.Merge( viewBBOX );
                    }

                    updateBBox = false;
                }

                // Constrain selection bounding box to coordinates limits
                movement = getSafeMovement( m_cursor - prevPos, originalBBox, bboxMovement );

                // Apply constrained movement
                m_cursor = prevPos + movement;

                controls->ForceCursorPosition( true, m_cursor );
                selection.SetReferencePoint( m_cursor );

                prevPos = m_cursor;
                totalMovement += movement;
                bboxMovement += movement;

                // Drag items to the current cursor position
                for( EDA_ITEM* item : sel_items )
                {
                    // Don't double move footprint pads, fields, etc.
                    //
                    // For PCB_GROUP_T, we make sure the selection includes only the top level
                    // group and not its descendants.
                    if( !item->GetParent() || !item->GetParent()->IsSelected() )
                        static_cast<BOARD_ITEM*>( item )->Move( movement );

                    if( !redraw3D && item->Type() == PCB_FOOTPRINT_T )
                        redraw3D = true;
                }

                if( redraw3D && allowRedraw3D )
                {
                    editFrame->Update3DView( false, true );
                    hasRedrawn3D = true;
                }

                if( showCourtyardConflicts && drc_on_move->m_FpInMove.size() )
                {
                    drc_on_move->Run();
                    drc_on_move->UpdateConflicts( m_toolMgr->GetView(), true );
                }

                m_toolMgr->PostEvent( EVENTS::SelectedItemsMoved );
            }
            else if( !m_dragging && !evt->IsAction( &ACTIONS::refreshPreview ) )
            {
                // Prepare to start dragging
                if( !evt->IsAction( &PCB_ACTIONS::move )
                        && !evt->IsAction( &PCB_ACTIONS::moveWithReference )
                        && !evt->IsAction( &PCB_ACTIONS::moveIndividually )
                        && cfg->m_TrackDragAction != TRACK_DRAG_ACTION::MOVE )
                {
                    if( invokeInlineRouter( PNS::DM_ANY ) )
                        break;
                }

                editFrame->HideSolderMask();

                m_dragging = true;

                // When editing footprints, all items have the same parent
                if( IsFootprintEditor() )
                {
                    m_commit->Modify( selection.Front() );
                }
                else
                {
                    // Save items, so changes can be undone
                    for( EDA_ITEM* item : selection )
                    {
                        // Don't double move footprint pads, fields, etc.
                        //
                        // For PCB_GROUP_T, the parent is the board.
                        if( item->GetParent() && item->GetParent()->IsSelected() )
                            continue;

                        m_commit->Modify( item );

                        // If moving a group, record position of all the descendants for undo
                        if( item->Type() == PCB_GROUP_T )
                        {
                            PCB_GROUP* group = static_cast<PCB_GROUP*>( item );
                            group->RunOnDescendants( [&]( BOARD_ITEM* bItem )
                                                     {
                                                         m_commit->Modify( bItem );
                                                     });
                        }
                    }
                }

                editFrame->UndoRedoBlock( true );
                m_cursor = controls->GetCursorPosition();

                if( selection.HasReferencePoint() )
                {
                    // start moving with the reference point attached to the cursor
                    grid.SetAuxAxes( false );

                    if( hv45Mode )
                    {
                        VECTOR2I moveVector = m_cursor - originalPos;
                        m_cursor = originalPos + GetVectorSnapped45( moveVector );
                    }

                    movement = m_cursor - selection.GetReferencePoint();

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

                        static_cast<BOARD_ITEM*>( item )->Move( movement );
                    }

                    selection.SetReferencePoint( m_cursor );
                }
                else
                {
                    std::vector<BOARD_ITEM*> items;

                    for( EDA_ITEM* item : selection )
                    {
                        items.push_back( static_cast<BOARD_ITEM*>( item ) );

                        if( showCourtyardConflicts && item->Type() == PCB_FOOTPRINT_T )
                            drc_on_move->m_FpInMove.push_back( static_cast<FOOTPRINT*>( item ) );
                    }

                    m_cursor = grid.BestDragOrigin( originalCursorPos, items );

                    // Set the current cursor position to the first dragged item origin, so the
                    // movement vector could be computed later
                    if( aPickReference )
                    {
                        selection.SetReferencePoint( pickedReferencePoint );
                        controls->ForceCursorPosition( true, pickedReferencePoint );
                        m_cursor = pickedReferencePoint;
                    }
                    else
                    {
                        // Check if user wants to warp the mouse to origin of moved object
                        if( !editFrame->GetMoveWarpsCursor() )
                            m_cursor = originalCursorPos; // No, so use original mouse pos instead

                        selection.SetReferencePoint( m_cursor );
                        grid.SetAuxAxes( true, m_cursor );
                    }

                    originalPos = m_cursor;
                }

                // Update variables for bounding box collision calculations
                updateBBox = true;

                controls->SetCursorPosition( m_cursor, false );

                prevPos = m_cursor;
                controls->SetAutoPan( true );
                m_toolMgr->PostEvent( EVENTS::SelectedItemsModified );
            }

            m_toolMgr->RunAction( PCB_ACTIONS::updateLocalRatsnest, false, new VECTOR2I( movement ) );
        }
        else if( evt->IsCancelInteractive() || evt->IsActivate() )
        {
            if( m_dragging && evt->IsCancelInteractive() )
                evt->SetPassEvent( false );

            restore_state = true; // Canceling the tool means that items have to be restored
            break;                // Finish
        }
        else if( evt->IsAction( &ACTIONS::undo ) )
        {
            restore_state = true; // Perform undo locally
            break;                // Finish
        }
        else if( evt->IsAction( &ACTIONS::doDelete ) || evt->IsAction( &ACTIONS::cut ) )
        {
            // Dispatch TOOL_ACTIONs
            evt->SetPassEvent();
            break; // finish -- there is no further processing for removed items
        }
        else if( evt->IsAction( &ACTIONS::duplicate ) )
        {
            evt->SetPassEvent();
            break; // finish -- Duplicate tool will start a new Move with the dup'ed items
        }
        else if( evt->IsAction( &PCB_ACTIONS::rotateCw )
                || evt->IsAction( &PCB_ACTIONS::rotateCcw )
                || evt->IsAction( &PCB_ACTIONS::flip )
                || evt->IsAction( &PCB_ACTIONS::mirrorH )
                || evt->IsAction( &PCB_ACTIONS::mirrorV ) )
        {
            updateBBox = true;
            eatFirstMouseUp = false;
            evt->SetPassEvent();
        }
        else if( evt->IsAction( &PCB_ACTIONS::moveExact ) )
        {
            // Reset positions so the Move Exactly is from the start.
            for( EDA_ITEM* item : selection )
            {
                BOARD_ITEM* i = static_cast<BOARD_ITEM*>( item );
                i->Move( -totalMovement );
            }

            break; // finish -- we moved exactly, so we are finished
        }
        else if( evt->IsMouseUp( BUT_LEFT ) || evt->IsClick( BUT_LEFT ) )
        {
            // Eat mouse-up/-click events that leaked through from the lock dialog
            if( eatFirstMouseUp && evt->Parameter<intptr_t>() != ACTIONS::CURSOR_CLICK )
            {
                eatFirstMouseUp = false;
                continue;
            }

            break; // finish
        }
        else if( evt->IsAction( &PCB_ACTIONS::toggleHV45Mode ) )
        {
            hv45Mode = !hv45Mode;
            displayConstraintsMessage( hv45Mode );
            evt->SetPassEvent( false );
        }
        else
        {
            evt->SetPassEvent();
        }

    } while( ( evt = Wait() ) ); // Assignment (instead of equality test) is intentional

    // Clear temporary COURTYARD_CONFLICT flag and ensure the conflict shadow is cleared
    if( showCourtyardConflicts )
        drc_on_move->ClearConflicts( m_toolMgr->GetView() );

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

    m_dragging = false;
    editFrame->UndoRedoBlock( false );

    m_toolMgr->GetTool<DRAWING_TOOL>()->UpdateStatusBar();

    if( hasRedrawn3D && restore_state )
        editFrame->Update3DView( false, true );

    // Discard reference point when selection is "dropped" onto the board
    selection.ClearReferencePoint();

    // Unselect all items to clear selection flags and then re-select the originally selected
    // items.
    m_toolMgr->RunAction( PCB_ACTIONS::selectionClear, true );
    m_toolMgr->RunAction( PCB_ACTIONS::selectItems, true, &orig_items );

    // TODO: there's an encapsulation leak here: this commit often has more than just the move
    // in it; for instance it might have a paste, append board, etc. as well.
    if( restore_state )
        m_commit->Revert();
    else
        m_commit->Push( _( "Drag" ) );

    // Remove the dynamic ratsnest from the screen
    m_toolMgr->RunAction( PCB_ACTIONS::hideLocalRatsnest, true );

    editFrame->PopTool( aEvent );
    editFrame->GetCanvas()->SetCurrentCursor( KICURSOR::ARROW );

    return restore_state ? -1 : 0;
}