feat: add history max record option #203

src/editor/core/draw/Draw.ts

@@ -140,7 +140,7 @@ export class Draw {
     this._createPage(0)
 
     this.i18n = new I18n()
-    this.historyManager = new HistoryManager()
+    this.historyManager = new HistoryManager(this)
     this.position = new Position(this)
     this.zone = new Zone(this)
     this.range = new RangeManager(this)

src/editor/core/history/HistoryManager.ts

@@ -1,8 +1,15 @@
+import { Draw } from '../draw/Draw'
+
 export class HistoryManager {
 
-  private readonly MAX_RECORD_COUNT = 1000
   private undoStack: Array<Function> = []
   private redoStack: Array<Function> = []
+  private maxRecordCount: number
+
+  constructor(draw: Draw) {
+    // 忽略第一次历史记录
+    this.maxRecordCount = draw.getOptions().historyMaxRecordCount + 1
+  }
 
   public undo() {
     if (this.undoStack.length > 1) {
@@ -27,7 +34,7 @@ export class HistoryManager {
     if (this.redoStack.length) {
       this.redoStack = []
     }
-    while (this.undoStack.length > this.MAX_RECORD_COUNT) {
+    while (this.undoStack.length > this.maxRecordCount) {
       this.undoStack.shift()
     }
   }

src/editor/index.ts

@@ -125,6 +125,7 @@ export default class Editor {
       defaultHyperlinkColor: '#0000FF',
       paperDirection: PaperDirection.VERTICAL,
       inactiveAlpha: 0.6,
+      historyMaxRecordCount: 100,
       ...options,
       header: headerOptions,
       footer: footerOptions,

src/editor/interface/Editor.ts

@@ -51,6 +51,7 @@ export interface IEditorOption {
   defaultHyperlinkColor?: string;
   paperDirection?: PaperDirection;
   inactiveAlpha?: number;
+  historyMaxRecordCount?: number;
   header?: IHeader;
   footer?: IFooter;
   pageNumber?: IPageNumber;