From 03445994119a8e0ecda934f9fc5a87b905907b90 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E8=A1=97=E8=A7=92=E5=B0=8F=E6=9E=97?= <1013335014@qq.com>
Date: Tue, 24 Sep 2024 18:21:48 +0800
Subject: [PATCH] =?UTF-8?q?Fix=EF=BC=9A=E4=BC=98=E5=8C=96=E5=85=AC?=
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---
 simple-mind-map/index.js               |  3 +++
 simple-mind-map/src/plugins/Formula.js | 16 +++++++++++++++-
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/simple-mind-map/index.js b/simple-mind-map/index.js
index 3260844d..657e87fe 100644
--- a/simple-mind-map/index.js
+++ b/simple-mind-map/index.js
@@ -35,6 +35,7 @@ class MindMap {
    * @param {defaultOpt} opt
    */
   constructor(opt = {}) {
+    MindMap.instanceCount++
     // 合并选项
     this.opt = this.handleOpt(merge(defaultOpt, opt))
     // 预处理节点数据
@@ -618,6 +619,7 @@ class MindMap {
     this.el.innerHTML = ''
     this.el = null
     this.removeCss()
+    MindMap.instanceCount--
   }
 }
 
@@ -634,6 +636,7 @@ MindMap.hasPlugin = plugin => {
     return item === plugin
   })
 }
+MindMap.instanceCount = 0
 
 // 定义新主题
 MindMap.defineTheme = (name, config = {}) => {
diff --git a/simple-mind-map/src/plugins/Formula.js b/simple-mind-map/src/plugins/Formula.js
index e6b9db1c..3827566f 100644
--- a/simple-mind-map/src/plugins/Formula.js
+++ b/simple-mind-map/src/plugins/Formula.js
@@ -4,6 +4,7 @@ import { getChromeVersion, htmlEscape } from '../utils/index'
 import { getBaseStyleText, getFontStyleText } from './FormulaStyle'
 
 let extended = false
+const QuillFormula = Quill.import('formats/formula')
 
 // 数学公式支持插件
 // 该插件在富文本模式下可用
@@ -18,6 +19,18 @@ class Formula {
     this.cssEl = null
     this.addStyle()
     this.extendQuill()
+    this.onDestroy = this.onDestroy.bind(this)
+    this.mindMap.on('beforeDestroy', this.onDestroy)
+  }
+
+  onDestroy() {
+    const instanceCount = Object.getPrototypeOf(this.mindMap).constructor
+      .instanceCount
+    // 如果思维导图实例数量变成0了，那么就恢复成默认的
+    if (instanceCount <= 1) {
+      extended = false
+      Quill.register('formats/formula', QuillFormula, true)
+    }
   }
 
   init() {
@@ -55,7 +68,6 @@ class Formula {
     if (extended) return
     extended = true
 
-    const QuillFormula = Quill.import('formats/formula')
     const self = this
 
     class CustomFormulaBlot extends QuillFormula {
@@ -173,11 +185,13 @@ class Formula {
   // 插件被移除前做的事情
   beforePluginRemove() {
     this.removeStyle()
+    this.mindMap.off('beforeDestroy', this.onDestroy)
   }
 
   // 插件被卸载前做的事情
   beforePluginDestroy() {
     this.removeStyle()
+    this.mindMap.off('beforeDestroy', this.onDestroy)
   }
 }