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Diffstat (limited to 'digikam/utilities/imageeditor/canvas/undomanager.cpp')
| -rw-r--r-- | digikam/utilities/imageeditor/canvas/undomanager.cpp | 253 |
1 files changed, 253 insertions, 0 deletions
diff --git a/digikam/utilities/imageeditor/canvas/undomanager.cpp b/digikam/utilities/imageeditor/canvas/undomanager.cpp new file mode 100644 index 0000000..25525dd --- /dev/null +++ b/digikam/utilities/imageeditor/canvas/undomanager.cpp @@ -0,0 +1,253 @@ +/* ============================================================ + * + * This file is a part of digiKam project + * http://www.digikam.org + * + * Date : 2005-02-06 + * Description : an image editor actions undo/redo manager + * + * Copyright (C) 2005-2006 by Renchi Raju <renchi@pooh.tam.uiuc.edu> + * Copyright (C) 2005-2006 Joern Ahrens <joern.ahrens@kdemail.net> + * + * 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, 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. + * + * ============================================================ */ + +// C++ includes. + +#include <typeinfo> +#include <climits> + +// Local includes. + +#include "ddebug.h" +#include "dimginterface.h" +#include "undoaction.h" +#include "undocache.h" +#include "undomanager.h" + +namespace Digikam +{ + +class UndoManagerPriv +{ + +public: + + UndoManagerPriv() + { + dimgiface = 0; + undoCache = 0; + origin = 0; + } + + QValueList<UndoAction*> undoActions; + QValueList<UndoAction*> redoActions; + int origin; + + UndoCache *undoCache; + + DImgInterface *dimgiface; +}; + +UndoManager::UndoManager(DImgInterface* iface) +{ + d = new UndoManagerPriv; + d->dimgiface = iface; + d->undoCache = new UndoCache; +} + +UndoManager::~UndoManager() +{ + clear(true); + delete d->undoCache; + delete d; +} + +void UndoManager::addAction(UndoAction* action) +{ + if (!action) + return; + + // All redo actions are invalid now + clearRedoActions(); + + d->undoActions.push_back(action); + + if (typeid(*action) == typeid(UndoActionIrreversible)) + { + int w = d->dimgiface->origWidth(); + int h = d->dimgiface->origHeight(); + int bytesDepth = d->dimgiface->bytesDepth(); + uchar* data = d->dimgiface->getImage(); + + d->undoCache->putData(d->undoActions.size(), w, h, bytesDepth, data); + } + + // if origin is at one of the redo action that are now invalid, + // it is no longer reachable + if (d->origin < 0) + d->origin = INT_MAX; + else + d->origin++; +} + +void UndoManager::undo() +{ + if (d->undoActions.isEmpty()) + return; + + UndoAction* action = d->undoActions.back(); + + if (typeid(*action) == typeid(UndoActionIrreversible)) + { + // Save the current state for the redo operation + + int w = d->dimgiface->origWidth(); + int h = d->dimgiface->origHeight(); + int bytesDepth = d->dimgiface->bytesDepth(); + uchar* data = d->dimgiface->getImage(); + + d->undoCache->putData(d->undoActions.size() + 1, w, h, bytesDepth, data); + + // And now, undo the action + + int newW, newH, newBytesDepth; + uchar *newData = d->undoCache->getData(d->undoActions.size(), newW, newH, newBytesDepth, false); + if (newData) + { + d->dimgiface->putImage(newData, newW, newH, newBytesDepth == 8 ? true : false); + delete [] newData; + } + } + else + { + action->rollBack(); + } + + d->undoActions.pop_back(); + d->redoActions.push_back(action); + d->origin--; +} + +void UndoManager::redo() +{ + if(d->redoActions.isEmpty()) + return; + + UndoAction *action = d->redoActions.back(); + + if(typeid(*action) == typeid(UndoActionIrreversible)) + { + int w, h, bytesDepth; + uchar *data = d->undoCache->getData(d->undoActions.size() + 2, w, h, bytesDepth, false); + if (data) + { + d->dimgiface->putImage(data, w, h, bytesDepth == 8 ? true : false); + delete[] data; + } + } + else + { + action->execute(); + } + + d->redoActions.pop_back(); + d->undoActions.push_back(action); + d->origin++; +} + +void UndoManager::clear(bool clearCache) +{ + clearUndoActions(); + clearRedoActions(); + setOrigin(); + + if(clearCache) + d->undoCache->clear(); +} + +void UndoManager::clearUndoActions() +{ + UndoAction *action; + QValueList<UndoAction*>::iterator it; + + for(it = d->undoActions.begin(); it != d->undoActions.end(); ++it) + { + action = *it; + delete action; + } + d->undoActions.clear(); +} + +void UndoManager::clearRedoActions() +{ + if(!anyMoreRedo()) + return; + + UndoAction *action; + QValueList<UndoAction*>::iterator it; + + // get the level of the first redo action + int level = d->undoActions.size() + 1; + for(it = d->redoActions.begin(); it != d->redoActions.end(); ++it) + { + action = *it; + d->undoCache->erase(level); + delete action; + level++; + } + d->undoCache->erase(level); + d->redoActions.clear(); +} + +bool UndoManager::anyMoreUndo() +{ + return !d->undoActions.isEmpty(); +} + +bool UndoManager::anyMoreRedo() +{ + return !d->redoActions.isEmpty(); +} + +void UndoManager::getUndoHistory(QStringList &titles) +{ + QValueList<UndoAction*>::iterator it; + + for(it = d->undoActions.begin(); it != d->undoActions.end(); ++it) + { + titles.push_front((*it)->getTitle()); + } +} + +void UndoManager::getRedoHistory(QStringList &titles) +{ + QValueList<UndoAction*>::iterator it; + + for(it = d->redoActions.begin(); it != d->redoActions.end(); ++it) + { + titles.push_front((*it)->getTitle()); + } +} + +bool UndoManager::isAtOrigin() +{ + return d->origin == 0; +} + +void UndoManager::setOrigin() +{ + d->origin = 0; +} + +} // namespace Digikam |