////  UndoStackScriptingInterface.cpp//  libraries/script-engine/src////  Created by Ryan Huffman on 10/22/14.//  Copyright 2014 High Fidelity, Inc.////  Distributed under the Apache License, Version 2.0.//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html// #include "UndoStackScriptingInterface.h" #include <QDebug>#include <QScriptValue>#include <QScriptValueList>#include <QScriptEngine> UndoStackScriptingInterface::UndoStackScriptingInterface(QUndoStack* undoStack) : _undoStack(undoStack) {} void UndoStackScriptingInterface::pushCommand(QScriptValue undoFunction, QScriptValue undoData,                                              QScriptValue redoFunction, QScriptValue redoData) {    if (undoFunction.engine()) {        ScriptUndoCommand* undoCommand = new ScriptUndoCommand(undoFunction, undoData, redoFunction, redoData);        undoCommand->moveToThread(undoFunction.engine()->thread());        _undoStack->push(undoCommand);    }} ScriptUndoCommand::ScriptUndoCommand(QScriptValue undoFunction, QScriptValue undoData,                                     QScriptValue redoFunction, QScriptValue redoData) :    _hasRedone(false),    _undoFunction(undoFunction),    _undoData(undoData),    _redoFunction(redoFunction),    _redoData(redoData) {} void ScriptUndoCommand::undo() {    QMetaObject::invokeMethod(this, "doUndo");} void ScriptUndoCommand::redo() {    // QUndoStack will call `redo()` when adding a command to the stack.  This    // makes it difficult to work with commands that span a period of time - for instance,    // the entity duplicate + move command that duplicates an entity and then moves it.    // A better implementation might be to properly implement `mergeWith()` and `id()`    // so that the two actions in the example would be merged.    if (_hasRedone) {        QMetaObject::invokeMethod(this, "doRedo");    }    _hasRedone = true;} void ScriptUndoCommand::doUndo() {    QScriptValueList args;    args << _undoData;    _undoFunction.call(QScriptValue(), args);} void ScriptUndoCommand::doRedo() {    QScriptValueList args;    args << _redoData;    _redoFunction.call(QScriptValue(), args);}