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#include "UndoSystem.h"
#include "itextstream.h"
#include <iostream>
#include "Operation.h"
#include "StackFiller.h"
namespace undo
{
UndoSystem::UndoSystem() :
_activeUndoStack(nullptr),
_undoLevels(RKEY_UNDO_QUEUE_SIZE)
{}
UndoSystem::~UndoSystem()
{
clear();
}
IUndoStateSaver* UndoSystem::getStateSaver(IUndoable& undoable)
{
auto result = _undoables.try_emplace(&undoable, *this, undoable);
// If we're in the middle of an active undo operation, assign this to the tracker (#4861)
if (_activeUndoStack != nullptr)
{
result.first->second.setStack(_activeUndoStack);
}
return &(result.first->second);
}
void UndoSystem::releaseStateSaver(IUndoable& undoable)
{
_undoables.erase(&undoable);
}
void UndoSystem::start()
{
_redoStack.clear();
if (_undoStack.size() == _undoLevels.get())
{
_undoStack.pop_front();
}
startUndo();
}
bool UndoSystem::operationStarted() const
{
return _activeUndoStack != nullptr;
}
void UndoSystem::cancel()
{
if (_activeUndoStack != nullptr)
{
_activeUndoStack->cancel();
setActiveUndoStack(nullptr);
}
}
void UndoSystem::finish(const std::string& command)
{
if (finishUndo(command))
{
rMessage() << command << std::endl;
_eventSignal.emit(EventType::OperationRecorded, command);
}
}
void UndoSystem::undo()
{
if (_undoStack.empty())
{
rMessage() << "Undo: no undo available" << std::endl;
return;
}
if (operationStarted())
{
rWarning() << "Undo not available while an operation is still in progress" << std::endl;
return;
}
const auto& operation = _undoStack.back();
auto operationName = operation->getName(); // copy this name, we need it after op destruction
rMessage() << "Undo: " << operationName << std::endl;
startRedo();
operation->restoreSnapshot();
finishRedo(operationName);
_undoStack.pop_back();
_eventSignal.emit(EventType::OperationUndone, operationName);
}
void UndoSystem::redo()
{
if (_redoStack.empty())
{
rMessage() << "Redo: no redo available" << std::endl;
return;
}
if (operationStarted())
{
rWarning() << "Redo not available while an operation is still in progress" << std::endl;
return;
}
const auto& operation = _redoStack.back();
auto operationName = operation->getName(); // copy this name, we need it after op destruction
rMessage() << "Redo: " << operationName << std::endl;
startUndo();
operation->restoreSnapshot();
finishUndo(operationName);
_redoStack.pop_back();
_eventSignal.emit(EventType::OperationRedone, operationName);
}
void UndoSystem::clear()
{
setActiveUndoStack(nullptr);
_undoStack.clear();
_redoStack.clear();
_eventSignal.emit(EventType::AllOperationsCleared, std::string());
// greebo: This is called on map shutdown, so don't clear the observers,
// there are some "persistent" observers like EntityInspector and ShaderClipboard
}
sigc::signal<void(IUndoSystem::EventType, const std::string&)>& UndoSystem::signal_undoEvent()
{
return _eventSignal;
}
void UndoSystem::startUndo()
{
_undoStack.start("unnamedCommand");
setActiveUndoStack(&_undoStack);
}
bool UndoSystem::finishUndo(const std::string& command)
{
bool changed = _undoStack.finish(command);
setActiveUndoStack(nullptr);
return changed;
}
void UndoSystem::startRedo()
{
_redoStack.start("unnamedCommand");
setActiveUndoStack(&_redoStack);
}
bool UndoSystem::finishRedo(const std::string& command)
{
bool changed = _redoStack.finish(command);
setActiveUndoStack(nullptr);
return changed;
}
// Assigns the given stack to all of the Undoables listed in the map
void UndoSystem::setActiveUndoStack(UndoStack* stack)
{
_activeUndoStack = stack;
for (auto& pair : _undoables)
{
pair.second.setStack(_activeUndoStack);
}
}
} // namespace undo
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