Finish import_viewer gui

UI/Base/LeftIndex.ts

@@ -0,0 +1,25 @@
+import BaseUIElement from "../BaseUIElement";
+import Combine from "./Combine";
+import BackToIndex from "../BigComponents/BackToIndex";
+
+export default class LeftIndex extends Combine{
+    
+    
+    constructor(leftContents: BaseUIElement[], mainContent: BaseUIElement, options?:{
+        hideBackButton : false | boolean
+    } ) {
+        
+        let back : BaseUIElement = undefined;
+        if(options?.hideBackButton ?? true){
+            back = new BackToIndex()
+        }
+        super([
+            new Combine([
+                new Combine([back, ...leftContents]).SetClass("sticky top-4"),
+            ]).SetClass("ml-4 block w-full md:w-2/6 lg:w-1/6"),
+            mainContent.SetClass("m-8 w-full mb-24")
+        ])
+        this.SetClass("h-full block md:flex")
+    }
+    
+}