Implement basic save/load (still needs some fixes)

.eslintrc.cjs

@@ -21,7 +21,9 @@ module.exports = {
   ],
   rules: {
     'space-before-function-paren': ['error', 'never'],
-    indent: ['warn', 2],
-    semi: ['warn', 'always']
+    indent: ['warn', 2, { SwitchCase: 1 }],
+    semi: ['warn', 'always'],
+    'no-unused-vars': 'off',
+    '@typescript-eslint/no-unused-vars': 'error'
   }
 };

src/App.tsx

@@ -1,6 +1,8 @@
 import * as React from 'react';
+import './App.scss';
+import { MainMenu } from './Components/MainMenu/MainMenu';
 import { ContainerModel, IContainerModel } from './Components/SVG/Elements/ContainerModel';
-import Editor from './Editor';
+import Editor, { IEditorState } from './Editor';
 import { AvailableContainer } from './Interfaces/AvailableContainer';
 import { Configuration } from './Interfaces/Configuration';
 
@@ -23,40 +25,21 @@ interface IAppState {
 export class App extends React.Component<IAppProps> {
   public state: IAppState;
 
-  public constructor(props: IAppProps) {
+  constructor(props: IAppProps) {
     super(props);
-
-    const MainContainer = new ContainerModel(
-      null,
-      {
-        id: 'main',
-        x: 0,
-        y: 0,
-        width: 1000,
-        height: 1000,
-        fillOpacity: 0,
-        stroke: 'black'
-      }
-    );
     this.state = {
       configuration: {
         AvailableContainers: [],
         AvailableSymbols: [],
         MainContainer: {} as AvailableContainer
       },
-      history: [
-        {
-          MainContainer,
-          SelectedContainer: MainContainer,
-          TypeCounters: {}
-        }
-      ],
+      history: [],
       historyCurrentStep: 0,
       isLoaded: false
     };
   }
 
-  componentDidMount() {
+  public NewEditor() {
     // Fetch the configuration from the API
     fetchConfiguration().then((configuration: Configuration) => {
       // Set the main container from the given properties of the API
@@ -91,6 +74,25 @@ export class App extends React.Component<IAppProps> {
     });
   }
 
+  public LoadEditor(files: FileList | null) {
+    if (files === null) {
+      return;
+    }
+    const file = files[0];
+    const reader = new FileReader();
+    reader.addEventListener('load', () => {
+      const result = reader.result as string;
+      const editorState: IEditorState = JSON.parse(result);
+      this.setState({
+        configuration: editorState.configuration,
+        history: editorState.history,
+        historyCurrentStep: editorState.historyCurrentStep,
+        isLoaded: true
+      } as IAppState);
+    });
+    reader.readAsText(file);
+  }
+
   public render() {
     if (this.state.isLoaded) {
       return (
@@ -102,6 +104,15 @@ export class App extends React.Component<IAppProps> {
           />
         </div>
       );
+    } else {
+      return (
+        <div className='bg-blue-100 h-full w-full'>
+          <MainMenu
+            newEditor={() => this.NewEditor()}
+            loadEditor={(files: FileList | null) => this.LoadEditor(files)}
+          />
+        </div>
+      );
     }
   }
 }
@@ -131,6 +142,7 @@ export async function fetchConfiguration(): Promise<Configuration> {
       if (xhr.readyState === XMLHttpRequest.DONE && xhr.status === 200) {
         resolve(JSON.parse(this.responseText));
       }
+      reject(xhr.responseText);
     };
     xhr.send();
   });

src/Components/ElementsSidebar/ElementsSidebar.tsx

@@ -38,7 +38,8 @@ export class ElementsSidebar extends React.Component<IElementsSidebarProps> {
       const depth: number = getDepth(container);
       const key = container.properties.id.toString();
       const text = '|\t'.repeat(depth) + key;
-      const selectedClass: string = this.props.SelectedContainer !== null &&
+      const selectedClass: string = this.props.SelectedContainer !== undefined &&
+        this.props.SelectedContainer !== null &&
         this.props.SelectedContainer.properties.id === container.properties.id
         ? 'bg-blue-500 hover:bg-blue-600'
         : 'bg-slate-400 hover:bg-slate-600';

src/Components/MainMenu/MainMenu.tsx

@@ -0,0 +1,74 @@
+import * as React from 'react';
+
+interface IMainMenuProps {
+  newEditor: () => void;
+  loadEditor: (files: FileList | null) => void
+}
+
+enum WindowState {
+  MAIN,
+  LOAD,
+}
+
+export const MainMenu: React.FC<IMainMenuProps> = (props) => {
+  const [windowState, setWindowState] = React.useState(WindowState.MAIN);
+  switch (windowState) {
+    case WindowState.LOAD:
+      return (
+        <div className='flex flex-col drop-shadow-lg bg-blue-50 p-12 rounded-lg absolute top-1/2 left-1/2 -translate-x-1/2 -translate-y-1/2'>
+          <form className="flex items-center space-x-6">
+            <label className="block">
+              <span className="sr-only">Choose profile photo</span>
+              <input
+                type="file"
+                accept="application/json"
+                onChange={e => {
+                  props.loadEditor(e.target.files);
+                }}
+                className="block w-full text-sm text-slate-500
+                  file:mr-4 file:py-2 file:px-4
+                  file:rounded-full file:border-0
+                  file:text-sm file:font-semibold
+                  file:transition-all
+                  file:cursor-pointer
+                  file:bg-blue-100 file:text-blue-700
+                  hover:file:bg-blue-200
+              "/>
+            </label>
+          </form>
+          {/* <button
+            onClick={() => setWindowState(WindowState.MAIN)}
+            className='block text-sm
+              mt-8 py-4 px-4
+              rounded-full border-0
+              font-semibold
+              transition-all
+              bg-blue-100 text-blue-700
+              hover:bg-blue-200'
+          >
+            Load
+          </button> */}
+          <button
+            onClick={() => setWindowState(WindowState.MAIN)}
+            className='block text-sm
+              mt-8 py-2 px-4
+              rounded-full border-0
+              font-semibold
+              transition-all
+              bg-blue-100 text-blue-700
+              hover:bg-blue-200'
+          >
+            Go back
+          </button>
+        </div>
+
+      );
+    default:
+      return (
+        <div className='absolute bg-blue-50 p-12 rounded-lg drop-shadow-lg grid grid-cols-1 md:grid-cols-2 gap-8 top-1/2 left-1/2 -translate-x-1/2 -translate-y-1/2'>
+          <button className='mainmenu-btn' onClick={props.newEditor}>Start from scratch</button>
+          <button className='mainmenu-btn' onClick={() => setWindowState(WindowState.LOAD)}>Load a configuration file</button>
+        </div>
+      );
+  }
+};

src/Editor.tsx

@@ -2,7 +2,6 @@ import React from 'react';
 import './Editor.scss';
 import Sidebar from './Components/Sidebar/Sidebar';
 import { ElementsSidebar } from './Components/ElementsSidebar/ElementsSidebar';
-import { AvailableContainer } from './Interfaces/AvailableContainer';
 import { Configuration } from './Interfaces/Configuration';
 import { SVG } from './Components/SVG/SVG';
 import { History } from './Components/History/History';
@@ -16,12 +15,15 @@ interface IEditorProps {
   historyCurrentStep: number
 }
 
-interface IEditorState {
+export interface IEditorState {
   isSidebarOpen: boolean,
   isSVGSidebarOpen: boolean,
   isHistoryOpen: boolean,
   history: Array<IHistoryState>,
   historyCurrentStep: number,
+  // do not use it, use props.configuration
+  // only used for serialization purpose
+  configuration: Configuration
 }
 
 class Editor extends React.Component<IEditorProps> {
@@ -33,8 +35,8 @@ class Editor extends React.Component<IEditorProps> {
       isSidebarOpen: true,
       isSVGSidebarOpen: false,
       isHistoryOpen: false,
-      configuration: props.configuration,
-      history: props.history,
+      configuration: Object.assign({}, props.configuration),
+      history: [...props.history],
       historyCurrentStep: props.historyCurrentStep
     } as IEditorState;
   }
@@ -238,6 +240,17 @@ class Editor extends React.Component<IEditorProps> {
     } as IEditorState);
   }
 
+  public SaveEditor() {
+    const exportName = 'state';
+    const dataStr = `data:text/json;charset=utf-8,${encodeURIComponent(JSON.stringify(this.state, getCircularReplacer(), 4))}`;
+    const downloadAnchorNode = document.createElement('a');
+    downloadAnchorNode.setAttribute('href', dataStr);
+    downloadAnchorNode.setAttribute('download', `${exportName}.json`);
+    document.body.appendChild(downloadAnchorNode); // required for firefox
+    downloadAnchorNode.click();
+    downloadAnchorNode.remove();
+  }
+
   /**
    * Render the application
    * @returns {JSX.Element} Rendered JSX element
@@ -291,9 +304,23 @@ class Editor extends React.Component<IEditorProps> {
         <SVG selected={current.SelectedContainer}>
           { current.MainContainer }
         </SVG>
+        <button onClick={() => this.SaveEditor()}>Save</button>
       </div>
     );
   }
 }
 
+const getCircularReplacer = () => {
+  const seen = new WeakSet();
+  return (key: any, value: object | null) => {
+    if (typeof value === 'object' && value !== null) {
+      if (seen.has(value)) {
+        return;
+      }
+      seen.add(value);
+    }
+    return value;
+  };
+};
+
 export default Editor;

src/index.scss

@@ -12,4 +12,7 @@
   .close-button {
     @apply transition-all w-full h-auto p-4 flex 
   }
+  .mainmenu-btn {
+    @apply transition-all bg-blue-100 hover:bg-blue-200 text-blue-700 text-lg font-semibold p-8  rounded-lg
+  }
 }