1 files changed, 253 insertions, 0 deletions
diff --git a/src/utilities/imageeditor/canvas/undomanager.cpp b/src/utilities/imageeditor/canvas/undomanager.cpp
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+++ b/src/utilities/imageeditor/canvas/undomanager.cpp
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+/* ============================================================
+ *
+ * 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;
+    }
+
+    TQValueList<UndoAction*>  undoActions;
+    TQValueList<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;
+    TQValueList<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;
+    TQValueList<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(TQStringList &titles)
+{
+    TQValueList<UndoAction*>::iterator it;
+
+    for(it = d->undoActions.begin(); it != d->undoActions.end(); ++it)
+    {
+        titles.push_front((*it)->getTitle());
+    }
+}
+
+void UndoManager::getRedoHistory(TQStringList &titles)
+{
+    TQValueList<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