Merged PR 16: Transform every single class components into functional component

This improve greatly the performance and the code cleaning.
It allows us to separate the inseparable class methods into modules functions

src/Components/Editor/Editor.tsx

@@ -0,0 +1,115 @@
+import React from 'react';
+import './Editor.scss';
+import { Configuration } from '../../Interfaces/Configuration';
+import { SVG } from '../SVG/SVG';
+import { HistoryState } from '../../Interfaces/HistoryState';
+import { UI } from '../UI/UI';
+import { SelectContainer, DeleteContainer, OnPropertyChange, AddContainerToSelectedContainer, AddContainer } from './ContainerOperations';
+import { SaveEditorAsJSON, SaveEditorAsSVG } from './Save';
+import { onKeyDown } from './Shortcuts';
+
+interface IEditorProps {
+  configuration: Configuration
+  history: HistoryState[]
+  historyCurrentStep: number
+}
+
+export interface IEditorState {
+  history: HistoryState[]
+  historyCurrentStep: number
+  configuration: Configuration
+}
+
+export const getCurrentHistory = (history: HistoryState[], historyCurrentStep: number): HistoryState[] => history.slice(0, historyCurrentStep + 1);
+export const getCurrentHistoryState = (history: HistoryState[], historyCurrentStep: number): HistoryState => history[historyCurrentStep];
+
+const Editor: React.FunctionComponent<IEditorProps> = (props) => {
+  const [history, setHistory] = React.useState<HistoryState[]>([...props.history]);
+  const [historyCurrentStep, setHistoryCurrentStep] = React.useState<number>(0);
+
+  React.useEffect(() => {
+    window.addEventListener('keyup', (event) => onKeyDown(
+      event,
+      history,
+      historyCurrentStep,
+      setHistoryCurrentStep
+    ));
+
+    return () => {
+      window.removeEventListener('keyup', (event) => onKeyDown(
+        event,
+        history,
+        historyCurrentStep,
+        setHistoryCurrentStep
+      ));
+    };
+  });
+
+  const configuration = props.configuration;
+  const current = getCurrentHistoryState(history, historyCurrentStep);
+  return (
+    <div className="App font-sans h-full">
+      <UI
+        current={current}
+        history={history}
+        historyCurrentStep={historyCurrentStep}
+        AvailableContainers={configuration.AvailableContainers}
+        SelectContainer={(container) => SelectContainer(
+          container,
+          history,
+          historyCurrentStep,
+          setHistory,
+          setHistoryCurrentStep
+        )}
+        DeleteContainer={(containerId: string) => DeleteContainer(
+          containerId,
+          history,
+          historyCurrentStep,
+          setHistory,
+          setHistoryCurrentStep
+        )}
+        OnPropertyChange={(key, value) => OnPropertyChange(
+          key, value,
+          history,
+          historyCurrentStep,
+          setHistory,
+          setHistoryCurrentStep
+        )}
+        AddContainerToSelectedContainer={(type) => AddContainerToSelectedContainer(
+          type,
+          configuration,
+          history,
+          historyCurrentStep,
+          setHistory,
+          setHistoryCurrentStep
+        )}
+        AddContainer={(index, type, parentId) => AddContainer(
+          index,
+          type,
+          parentId,
+          configuration,
+          history,
+          historyCurrentStep,
+          setHistory,
+          setHistoryCurrentStep
+        )}
+        SaveEditorAsJSON={() => SaveEditorAsJSON(
+          history,
+          historyCurrentStep,
+          configuration
+        )}
+        SaveEditorAsSVG={() => SaveEditorAsSVG()}
+        LoadState={(move) => setHistoryCurrentStep(move)}
+      />
+      <SVG
+        width={Number(current.MainContainer?.properties.width)}
+        height={Number(current.MainContainer?.properties.height)}
+        selected={current.SelectedContainer}
+      >
+        { current.MainContainer }
+      </SVG>
+    </div>
+  );
+};
+
+export default Editor;