Use stimulus controller for sidebar treeviews.

assets/controllers/elements/sidebar_tree_controller.js

@@ -0,0 +1,63 @@
+import {Controller} from "@hotwired/stimulus";
+import {default as TreeController} from "./tree_controller";
+
+import "patternfly-bootstrap-treeview/src/css/bootstrap-treeview.css"
+import "patternfly-bootstrap-treeview";
+
+export default class extends TreeController {
+    static targets = [ "tree", 'sourceText' ];
+
+    _storage_key;
+
+    connect() {
+        const default_mode = this.element.dataset.defaultMode;
+
+        this._storage_key = 'tree_' + this.element.id;
+
+        //Check if we have a saved mode
+        const stored_mode = localStorage.getItem(this._storage_key);
+
+        //Use stored mode if possible, otherwise use default
+        if(stored_mode) {
+            try {
+                this.setMode(stored_mode);
+            } catch (e) {
+                console.error(e);
+                //If an error happenes, use the default mode
+                this.setMode(default_mode);
+            }
+        } else {
+            this.setMode(default_mode);
+        }
+    }
+
+    setMode(mode) {
+        //Find the button for this mode
+        const modeButton = this.element.querySelector(`[data-mode="${mode}"]`);
+        if(!modeButton) {
+            throw new Error(`Could not find button for mode ${mode}`);
+        }
+
+        //Get the url and text from the button
+        const url = modeButton.dataset.url;
+        const text = modeButton.dataset.text;
+
+        this.sourceTextTarget.innerText = text;
+
+        this.setURL(url);
+    }
+
+    changeDataSource(event)
+    {
+        const mode = event.params.mode ?? event.target.dataset.mode;
+        const url = event.params.url ?? event.target.dataset.url;
+        const text = event.params.text ?? event.target.dataset.text;
+
+        this.sourceTextTarget.innerText = text;
+
+        this.setURL(url);
+
+        //Save the mode in local storage
+        localStorage.setItem(this._storage_key, mode);
+    }
+}