Notes/src/public/app/widgets/buttons/left_pane_toggle.js

import options from "../../services/options.js";
import splitService from "../../services/resizer.js";
import CommandButtonWidget from "./command_button.js";
import { t } from "../../services/i18n.js";

export default class LeftPaneToggleWidget extends CommandButtonWidget {
    constructor(isHorizontalLayout) {
        super();

        this.class(isHorizontalLayout ? "toggle-button" : "launcher-button");

        this.settings.icon = () => {
            if (options.get("layoutOrientation") === "horizontal") {
                return "bx-sidebar";
            }

            return (options.is('leftPaneVisible') ? "bx-chevrons-left" : "bx-chevrons-right");
        };

        this.settings.title = () => options.is('leftPaneVisible')
            ? t("left_pane_toggle.hide_panel")
            : t("left_pane_toggle.show_panel");

        this.settings.command = () => options.is('leftPaneVisible')
            ? "hideLeftPane"
            : "showLeftPane";

        if (isHorizontalLayout) {
            this.settings.titlePlacement = "bottom";
        }
    }

    refreshIcon() {
        super.refreshIcon();

        splitService.setupLeftPaneResizer(options.is('leftPaneVisible'));
    }

    entitiesReloadedEvent({loadResults}) {
        if (loadResults.isOptionReloaded("leftPaneVisible")) {
            this.refreshIcon();
        }
    }
}