schematic_undo_redo.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2004 Jean-Pierre Charras, [email protected]
 * Copyright (C) 2004-2021 KiCad Developers, see change_log.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 <sch_edit_frame.h>
#include <tool/tool_manager.h>
#include <schematic.h>
#include <sch_bus_entry.h>
#include <sch_junction.h>
#include <sch_line.h>
#include <sch_bitmap.h>
#include <tools/ee_selection_tool.h>
#include <drawing_sheet/ds_proxy_undo_item.h>
#include <tool/actions.h>


/* Functions to undo and redo edit commands.
 *
 * m_UndoList and m_RedoList handle a std::vector of PICKED_ITEMS_LIST
 * Each PICKED_ITEMS_LIST handle a std::vector of pickers (class ITEM_PICKER),
 * that store the list of schematic items that are concerned by the command to
 * undo or redo and is created for each command to undo (handle also a command
 * to redo). each picker has a pointer pointing to an item to undo or redo (in
 * fact: deleted, added or modified), and has a pointer to a copy of this item,
 * when this item has been modified (the old values of parameters are
 * therefore saved)
 *
 * there are 3 cases:
 * - delete item(s) command
 * - change item(s) command
 * - add item(s) command
 * and 2 cases for block:
 * - move list of items
 * - mirror (Y) list of items
 *
 * Undo command
 * - delete item(s) command:
 * => deleted items are moved in undo list
 *
 * - change item(s) command
 * => A copy of item(s) is made (a DrawPickedStruct list of wrappers)
 * the .m_Link member of each wrapper points the modified item.
 * the .m_Item member of each wrapper points the old copy of this item.
 *
 * - add item(s) command
 * =>A list of item(s) is made. The .m_Item member of each wrapper points
 * the new item.
 *
 * Redo command
 * - delete item(s) old command:
 * => deleted items are moved into m_tree
 *
 * - change item(s) command
 * => the copy of item(s) is moved in Undo list
 *
 * - add item(s) command
 * => The list of item(s) is used to create a deleted list in undo
 * list(same as a delete command)
 *
 * Some block operations that change items can be undone without memorized
 * items, just the coordinates of the transform: move list of items (undo/
 * redo is made by moving with the opposite move vector) mirror (Y) and flip
 * list of items (undo/redo is made by mirror or flip items) so they are
 * handled specifically.
 *
 * A problem is the hierarchical sheet handling.
 * the data associated (sub-hierarchy, undo/redo list) is deleted only
 * when the sheet is really deleted (i.e. when deleted from undo or redo list)
 * This is handled by its destructor.
 */


/* Used if undo / redo command:
 * swap data between Item and its copy, pointed by its picked item link member
 * swapped data is data modified by editing, so not all values are swapped
 */

void SCH_EDIT_FRAME::StartNewUndo()
{
 PICKED_ITEMS_LIST* blank = new PICKED_ITEMS_LIST();
 PushCommandToUndoList( blank );
}


void SCH_EDIT_FRAME::SaveCopyInUndoList( SCH_SCREEN*  aScreen,
 SCH_ITEM* aItem,
 UNDO_REDO aCommandType,
 bool aAppend )
{
 PICKED_ITEMS_LIST* commandToUndo = nullptr;

 wxCHECK( aItem, /* void */ );

 // Connectivity may change
 aItem->SetConnectivityDirty();

 PICKED_ITEMS_LIST* lastUndo = PopCommandFromUndoList();

 // If the last stack was empty, use that one instead of creating a new stack
 if( lastUndo )
 {
 if( aAppend || !lastUndo->GetCount() )
 commandToUndo = lastUndo;
 else
 PushCommandToUndoList( lastUndo );
 }

 if( !commandToUndo )
 {
 commandToUndo = new PICKED_ITEMS_LIST();
 }

 ITEM_PICKER itemWrapper( aScreen, aItem, aCommandType );
 itemWrapper.SetFlags( aItem->GetFlags() );

 switch( aCommandType )
 {
 case UNDO_REDO::CHANGED: /* Create a copy of item */
 itemWrapper.SetLink( aItem->Duplicate( true ) );
 commandToUndo->PushItem( itemWrapper );
 break;

 case UNDO_REDO::NEWITEM:
 case UNDO_REDO::DELETED:
 commandToUndo->PushItem( itemWrapper );
 break;

 default:
 wxFAIL_MSG( wxString::Format( wxT( "SaveCopyInUndoList() error (unknown code %X)" ),
 aCommandType ) );
 break;
 }

 if( commandToUndo->GetCount() )
 {
 /* Save the copy in undo list */
 PushCommandToUndoList( commandToUndo );

 /* Clear redo list, because after new save there is no redo to do */
 ClearUndoORRedoList( REDO_LIST );
 }
 else
 {
 delete commandToUndo;
 }
}


void SCH_EDIT_FRAME::SaveCopyInUndoList( const PICKED_ITEMS_LIST& aItemsList,
 UNDO_REDO aTypeCommand,
 bool aAppend )
{
 PICKED_ITEMS_LIST* commandToUndo = nullptr;

 if( !aItemsList.GetCount() )
 return;

 PICKED_ITEMS_LIST* lastUndo = PopCommandFromUndoList();

 // If the last stack was empty, use that one instead of creating a new stack
 if( lastUndo )
 {
 if( aAppend || !lastUndo->GetCount() )
 commandToUndo = lastUndo;
 else
 PushCommandToUndoList( lastUndo );
 }

 if( !commandToUndo )
 commandToUndo = new PICKED_ITEMS_LIST();

 // Copy picker list:
 if( !commandToUndo->GetCount() )
 commandToUndo->CopyList( aItemsList );
 else
 {
 // Unless we are appending, in which case, get the picker items
 for( unsigned ii = 0; ii < aItemsList.GetCount(); ii++ )
 commandToUndo->PushItem( aItemsList.GetItemWrapper( ii) );
 }

 // Verify list, and creates data if needed
 for( unsigned ii = 0; ii < commandToUndo->GetCount(); ii++ )
 {
 SCH_ITEM* sch_item = dynamic_cast<SCH_ITEM*>( commandToUndo->GetPickedItem( ii ) );

 // Common items implemented in EDA_DRAW_FRAME will not be SCH_ITEMs.
 if( !sch_item )
 continue;

 // Connectivity may change
 sch_item->SetConnectivityDirty();

 UNDO_REDO command = commandToUndo->GetPickedItemStatus( ii );

 if( command == UNDO_REDO::UNSPECIFIED )
 {
 command = aTypeCommand;
 commandToUndo->SetPickedItemStatus( command, ii );
 }

 switch( command )
 {
 case UNDO_REDO::CHANGED:

 /* If needed, create a copy of item, and put in undo list
 * in the picker, as link
 * If this link is not null, the copy is already done
 */
 if( commandToUndo->GetPickedItemLink( ii ) == nullptr )
 commandToUndo->SetPickedItemLink( sch_item->Duplicate( true ), ii );

 wxASSERT( commandToUndo->GetPickedItemLink( ii ) );
 break;

 case UNDO_REDO::NEWITEM:
 case UNDO_REDO::DELETED:
 case UNDO_REDO::EXCHANGE_T:
 case UNDO_REDO::PAGESETTINGS:
 break;

 default:
 wxFAIL_MSG( wxString::Format( wxT( "Unknown undo/redo command %d" ), command ) );
 break;
 }
 }

 if( commandToUndo->GetCount() )
 {
 /* Save the copy in undo list */
 PushCommandToUndoList( commandToUndo );

 /* Clear redo list, because after new save there is no redo to do */
 ClearUndoORRedoList( REDO_LIST );
 }
 else // Should not occur
 {
 delete commandToUndo;
 }
}


void SCH_EDIT_FRAME::PutDataInPreviousState( PICKED_ITEMS_LIST* aList )
{
 // Undo in the reverse order of list creation: (this can allow stacked changes like the
 // same item can be changed and deleted in the same complex command).
 for( int ii = aList->GetCount() - 1; ii >= 0; ii-- )
 {
 UNDO_REDO status = aList->GetPickedItemStatus((unsigned) ii );
 EDA_ITEM* eda_item = aList->GetPickedItem( (unsigned) ii );
 SCH_SCREEN* screen =
 dynamic_cast< SCH_SCREEN* >( aList->GetScreenForItem( (unsigned) ii ) );

 wxCHECK( screen, /* void */ );

 eda_item->SetFlags( aList->GetPickerFlags( (unsigned) ii ) );
 eda_item->ClearEditFlags();
 eda_item->ClearTempFlags();

 if( status == UNDO_REDO::NOP )
 {
 continue;
 }
 if( status == UNDO_REDO::NEWITEM )
 {
 // new items are deleted on undo
 RemoveFromScreen( eda_item, screen );
 aList->SetPickedItemStatus( UNDO_REDO::DELETED, (unsigned) ii );
 }
 else if( status == UNDO_REDO::DELETED )
 {
 // deleted items are re-inserted on undo
 AddToScreen( eda_item, screen );
 aList->SetPickedItemStatus( UNDO_REDO::NEWITEM, (unsigned) ii );
 }
 else if( status == UNDO_REDO::PAGESETTINGS )
 {
 // swap current settings with stored settings
 DS_PROXY_UNDO_ITEM alt_item( this );
 DS_PROXY_UNDO_ITEM* item = static_cast<DS_PROXY_UNDO_ITEM*>( eda_item );
 item->Restore( this );
 *item = alt_item;
 }
 else if( dynamic_cast<SCH_ITEM*>( eda_item ) )
 {
 // everything else is modified in place
 SCH_ITEM* item = (SCH_ITEM*) eda_item;
 SCH_ITEM* alt_item = (SCH_ITEM*) aList->GetPickedItemLink( (unsigned) ii );

 // The root sheet is a pseudo object that owns the root screen object but is not on
 // the root screen so do not attempt to remove it from the screen it owns.
 if( item != &Schematic().Root() )
 RemoveFromScreen( item, screen );

 switch( status )
 {
 case UNDO_REDO::CHANGED:
 item->SwapData( alt_item );
 break;

 case UNDO_REDO::EXCHANGE_T:
 aList->SetPickedItem( alt_item, (unsigned) ii );
 aList->SetPickedItemLink( item, (unsigned) ii );
 item = alt_item;
 break;

 default:
 wxFAIL_MSG( wxString::Format( wxT( "Unknown undo/redo command %d" ),
 aList->GetPickedItemStatus( (unsigned) ii ) ) );
 break;
 }

 if( item != &Schematic().Root() )
 AddToScreen( item, screen );
 }
 }

 // Bitmaps are cached in Opengl: clear the cache, because
 // the cache data can be invalid
 GetCanvas()->GetView()->RecacheAllItems();
 GetCanvas()->GetView()->ClearHiddenFlags();
}


void SCH_EDIT_FRAME::RollbackSchematicFromUndo()
{
 PICKED_ITEMS_LIST* undo = PopCommandFromUndoList();

 // Skip empty frames
 while( undo && ( !undo->GetCount()
 || ( undo->GetCount() == 1 && undo->GetPickedItemStatus( 0 ) == UNDO_REDO::NOP ) ) )
 {
 delete undo;
 undo = PopCommandFromUndoList();
 }

 if( undo )
 {
 PutDataInPreviousState( undo );
 undo->ClearListAndDeleteItems();
 delete undo;

 SetSheetNumberAndCount();
 UpdateHierarchyNavigator();

 TestDanglingEnds();

 m_toolManager->GetTool<EE_SELECTION_TOOL>()->RebuildSelection();
 }

 SyncView();
 GetCanvas()->Refresh();
}


void SCH_EDIT_FRAME::ClearUndoORRedoList( UNDO_REDO_LIST whichList, int aItemCount )
{
 if( aItemCount == 0 )
 return;

 UNDO_REDO_CONTAINER& list = whichList == UNDO_LIST ? m_undoList : m_redoList;

 for( PICKED_ITEMS_LIST* command : list.m_CommandsList )
 {
 command->ClearListAndDeleteItems();
 delete command;
 }

 list.m_CommandsList.clear();
}