Mercurial > hg > orthanc-stone
diff Framework/Scene2DViewport/UndoStack.h @ 858:e3c56d4f863f
GuiAdapter : mouse event routing in SDL + split the undo stack from the
ViewportController for multi-canvas apps + adapted the samples to this change
author | Benjamin Golinvaux <bgo@osimis.io> |
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date | Mon, 24 Jun 2019 10:31:04 +0200 |
parents | |
children | ac88989817e3 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Framework/Scene2DViewport/UndoStack.h Mon Jun 24 10:31:04 2019 +0200 @@ -0,0 +1,77 @@ +/** + * Stone of Orthanc + * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics + * Department, University Hospital of Liege, Belgium + * Copyright (C) 2017-2019 Osimis S.A., Belgium + * + * This program is free software: you can redistribute it and/or + * modify it under the terms of the GNU Affero General Public License + * as published by the Free Software Foundation, either version 3 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 + * Affero General Public License for more details. + * + * You should have received a copy of the GNU Affero General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + **/ + +#pragma once + +#include <boost/shared_ptr.hpp> + +#include <vector> + +namespace OrthancStone +{ + class TrackerCommand; + + class UndoStack + { + public: + UndoStack(); + + /** + Stores a command : + - this first trims the undo stack to keep the first numAppliedCommands_ + - then it adds the supplied command at the top of the undo stack + + In other words, when a new command is pushed, all the undone (and not + redone) commands are removed. + */ + void PushCommand(boost::shared_ptr<TrackerCommand> command); + + /** + Undoes the command at the top of the undo stack, or throws if there is no + command to undo. + You can check "CanUndo" first to protect against extraneous redo. + */ + void Undo(); + + /** + Redoes the command that is just above the last applied command in the undo + stack or throws if there is no command to redo. + You can check "CanRedo" first to protect against extraneous redo. + */ + void Redo(); + + /** selfexpl */ + bool CanUndo() const; + + /** selfexpl */ + bool CanRedo() const; + + private: + std::vector<boost::shared_ptr<TrackerCommand> > commandStack_; + + /** + This is always between >= 0 and <= undoStack_.size() and gives the + position where the controller is in the undo stack. + - If numAppliedCommands_ > 0, one can undo + - If numAppliedCommands_ < numAppliedCommands_.size(), one can redo + */ + size_t numAppliedCommands_; + }; +}