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renderUndo.js
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renderUndo.js
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'use strict'
const Electron = require('electron')
const EventEmitter = require('events')
// ==========================
// Internal
// ==========================
/**
* @class Command
*/
class Command {
// {op=xx,scene=xx,uuid=xx,prop=xx,oldValue=xx,newValue=xx,time=xx}
constructor(info) {
this.info = info
}
undo() {
let node = cocosGetItemByUUID(this.info.scene, this.info.uuid)
if (this.info.op == 'prop') {
if (!node) {
return false
}
if (this.info.doPropChange) {
this.info.doPropChange(node, this.info.prop, this.info.oldValue)
} else {
NodePropChange(node, this.info.prop, this.info.oldValue)
}
return true
}
console.warn('Please implement undo function in your command')
}
redo() {
let node = cocosGetItemByUUID(this.info.scene, this.info.uuid)
if (this.info.op == 'prop') {
if (!node) {
return false
}
if (this.info.doPropChange) {
this.info.doPropChange(node, this.info.prop, this.info.newValue)
} else {
NodePropChange(node, this.info.prop, this.info.newValue)
}
return true
}
console.warn('Please implement redo function in your command')
}
isCanCombine(other) {
if (!this.info || !other.info) {
return false
}
if (this.info.op != other.info.op) {
return false
}
if (this.info.uuid != other.info.uuid) {
return false
}
if (this.info.op == 'prop' && (this.info.prop != other.info.prop)) {
return false
}
if (Math.abs(this.info.time - other.info.time) >= 1000) {
return false
}
return true
}
combineCommand(other) {
if (!this.isCanCombine(other)) {
return false
}
this.info.time = Math.max(this.info.time, other.info.time)
this.info.newValue = other.info.newValue
return true
}
dirty() { return true; }
}
/**
* @class CommandGroup
*/
class CommandGroup {
constructor() {
this._commands = []
this._time = null
this.desc = ''
}
undo() {
for (let i = this._commands.length - 1; i >= 0; --i) {
this._commands[i].undo()
}
}
redo() {
for (let i = 0; i < this._commands.length; ++i) {
this._commands[i].redo()
}
}
dirty() {
for (let i = 0; i < this._commands.length; ++i) {
if (this._commands[i].dirty()) {
return true
}
}
return false
}
add(cmd) {
this._commands.push(cmd)
this._time = cmd.info.time
}
clear() {
this._commands = []
}
canCommit() {
return this._commands.length
}
isCanCombine(other) {
if (this._commands.length == 0) {
return true
}
for (let i = 0; i < this._commands.length; ++i) {
if (this._commands[i].isCanCombine(other)) {
return true
}
}
if (this._time && Math.abs(this._time - other.info.time) < 1000) {
return true
}
return false
}
combineCommand(other) {
if (this._commands.length == 0) {
this.add(other)
return true
}
for (let i = 0; i < this._commands.length; ++i) {
if (this._commands[i].isCanCombine(other) && this._commands[i].combineCommand(other)) {
this._time = other.info.time
return true
}
}
if (this._time && Math.abs(this._time - other.info.time) < 1000) {
this.add(other)
return true
}
return false
}
}
/**
* @class UndoList
*/
class UndoList extends EventEmitter {
constructor(type) {
super()
// 是否变化时发送事件的变化
this._silent = false
// 分为local和global类型, local类型事件变化只会通知本地, global则会通常整个编辑器
this._type = type
// 当前的命令列表
this._curGroup = new CommandGroup()
// 操作过程的命令列表
this._groups = []
// 记录当前的位置信息
this._position = -1
// 上一次保存时的位置信息
this._savePosition = -1
}
reset() {
this.clear()
}
undo() {
// check if we have un-commit group
if (this._curGroup.canCommit()) {
this._curGroup.undo()
this._changed('undo-cache')
this._groups.push(this._curGroup)
this._curGroup = new CommandGroup()
return true
}
// check if can undo
if (this._position < 0) {
return false
}
let group = this._groups[this._position]
group.undo()
this._position--
this._changed('undo')
return true
}
redo() {
// check if can redo
if (this._position >= this._groups.length - 1) {
return false
}
this._position++
let group = this._groups[this._position]
group.redo()
this._changed('redo')
return true
}
add(cmd) {
this._clearRedo()
if (this._curGroup.isCanCombine(cmd)) {
this._curGroup.combineCommand(cmd)
} else {
this.commit()
this._curGroup.add(cmd)
}
this._changed('add-command')
}
commit() {
if (this._curGroup.canCommit()) {
this._groups.push(this._curGroup)
this._position++
this._changed('commit')
}
this._curGroup = new CommandGroup()
}
cancel() {
this._curGroup.clear()
}
save() {
this.commit()
this._savePosition = this._position
this._changed('save')
}
isSaved() {
return this._savePosition == this._position && !this._curGroup.canCommit()
}
clear() {
this._curGroup = new CommandGroup()
this._groups = []
this._position = -1
this._savePosition = -1
this._changed('clear')
}
dirty() {
if (this._savePosition !== this._position) {
let min = Math.min(this._position, this._savePosition)
let max = Math.max(this._position, this._savePosition)
for (let i = min + 1; i <= max; i++) {
if (this._groups[i].dirty()) {
return true
}
}
}
return false
}
setCurrentDescription(desc) {
this._curGroup.desc = desc
}
_clearRedo() {
if (this._position + 1 === this._groups.length) {
return
}
this._groups = this._groups.slice(0, this._position + 1)
this._curGroup.clear()
if (this._savePosition > this._position) {
this._savePosition = this._position
}
this._changed('clear-redo')
}
_changed(type) {
if (this._silent) {
return
}
if (this._type === 'local') {
this.emit('changed', type)
return
}
Ipc.sendToAll('undo:changed', type)
}
}
// ==========================
// exports
// ==========================
class UndoObj {
constructor() {
this._undoList = new UndoList('local')
}
undo() {
if (this._undoList.undo()) {
Ipc.sendToAll('ui:has_item_change', {})
}
}
redo() {
if (this._undoList.redo()) {
Ipc.sendToAll('ui:has_item_change', {})
}
}
add(cmd) {
this._undoList.add(cmd)
}
commit() {
this._undoList.commit()
}
cancel() {
this._undoList.cancel()
}
collapseTo(index) {
this._undoList.collapseTo(index)
}
save() {
this._undoList.save()
}
isSaved() {
return this._undoList.isSaved()
}
clear() {
this._undoList.clear()
}
reset() {
return this._undoList.reset()
}
dirty() {
return this._undoList.dirty()
}
setCurrentDescription(desc) {
return this._undoList.setCurrentDescription(desc)
}
local() {
return new UndoList('local')
}
}
// {op=xx,scene=xx,uuid=xx,prop=xx,oldValue=xx,newValue=xx,time=xx, doPropChange=fn}
function newPropCommandChange(scene, uuid, prop, oldValue, newValue, doPropChange) {
return new Command({ op: 'prop', scene: getRootNode(scene), uuid: uuid, prop: prop, oldValue: oldValue, newValue: newValue, doPropChange: doPropChange, time: new Date().getTime() })
}
function tryAddCommand(undo, command) {
// no change don't add
if (command.info.oldValue == command.info.newValue) {
return
}
undo.add(command)
}
function addNodeCommand(node, prop, oldValue, newValue, doPropChange) {
let scene = getRootNode(node)
if (!scene._undo) {
return
}
tryAddCommand(scene._undo, newPropCommandChange(scene, node.uuid, prop, oldValue, newValue, doPropChange))
}