UndoManager.cpp

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#include "Headers/UndoManager.h"
 
namespace Divide {
 
UndoManager::UndoManager(const U32 maxSize)
    : _maxSize(maxSize)
{
}
 
bool UndoManager::Undo() {
    if (!_undoStack.empty()) {
        auto entry = _undoStack.back();
        const bool ret = apply(entry);
        _undoStack.pop_back();
        if (ret) {
            entry->swapValues();
            _redoStack.push_back(entry);
        }
        return ret;
    }
 
    return false;
}
 
bool UndoManager::Redo() {
    if (!_redoStack.empty()) {
        auto entry = _redoStack.back();
        const bool ret = apply(entry);
        _redoStack.pop_back();
        if (ret) {
            entry->swapValues();
            _undoStack.push_back(entry);
        }
        return ret;
    }
    return false;
}
 
bool UndoManager::apply(const std::shared_ptr<IUndoEntry>& entry) {
    if (entry != nullptr) {
        entry->apply();
        _lastActionName = entry->_name;
        return true;
    }
    return false;
}
 
 
const string& UndoManager::lasActionName() const noexcept {
    return _lastActionName;
}
 
} //namespace Divide