trilium/src/public/app/components/app_context.js

import froca from "../services/froca.js";
import bundleService from "../services/bundle.js";
import RootCommandExecutor from "./root_command_executor.js";
import Entrypoints from "./entrypoints.js";
import options from "../services/options.js";
import utils from "../services/utils.js";
import zoomComponent from "./zoom.js";
import TabManager from "./tab_manager.js";
import Component from "./component.js";
import keyboardActionsService from "../services/keyboard_actions.js";
import linkService from "../services/link.js";
import MobileScreenSwitcherExecutor from "./mobile_screen_switcher.js";
import MainTreeExecutors from "./main_tree_executors.js";
import toast from "../services/toast.js";
import ShortcutComponent from "./shortcut_component.js";

class AppContext extends Component {
    constructor(isMainWindow) {
        super();

        this.isMainWindow = isMainWindow;
        // non-widget/layout components needed for the application
        this.components = [];
        this.beforeUnloadListeners = [];
    }

    setLayout(layout) {
        this.layout = layout;
    }

    async start() {
        this.initComponents();

        // options are often needed for isEnabled()
        await options.initializedPromise;

        this.renderWidgets();

        await froca.initializedPromise;

        this.tabManager.loadTabs();

        setTimeout(() => bundleService.executeStartupBundles(), 2000);
    }

    initComponents() {
        this.tabManager = new TabManager();

        this.components = [
            this.tabManager,
            new RootCommandExecutor(),
            new Entrypoints(),
            new MainTreeExecutors(),
            new ShortcutComponent()
        ];

        if (utils.isMobile()) {
            this.components.push(new MobileScreenSwitcherExecutor());
        }

        for (const component of this.components) {
            this.child(component);
        }

        if (utils.isElectron()) {
            this.child(zoomComponent);
        }
    }

    renderWidgets() {
        const rootWidget = this.layout.getRootWidget(this);
        const $renderedWidget = rootWidget.render();

        keyboardActionsService.updateDisplayedShortcuts($renderedWidget);

        $("body").append($renderedWidget);

        $renderedWidget.on('click', "[data-trigger-command]", function() {
            if ($(this).hasClass("disabled")) {
                return;
            }

            const commandName = $(this).attr('data-trigger-command');
            const $component = $(this).closest(".component");
            const component = $component.prop("component");

            component.triggerCommand(commandName, {$el: $(this)});
        });

        this.child(rootWidget);

        this.triggerEvent('initialRenderComplete');
    }

    /** @returns {Promise<void>} */
    triggerEvent(name, data = {}) {
        return this.handleEvent(name, data);
    }

    /** @returns {Promise<*>} */
    triggerCommand(name, data = {}) {
        for (const executor of this.components) {
            const fun = executor[`${name}Command`];

            if (fun) {
                return executor.callMethod(fun, data);
            }
        }

        // this might hint at error, but sometimes this is used by components which are at different places
        // in the component tree to communicate with each other
        console.debug(`Unhandled command ${name}, converting to event.`);

        return this.triggerEvent(name, data);
    }

    getComponentByEl(el) {
        return $(el).closest(".component").prop('component');
    }

    addBeforeUnloadListener(obj) {
        if (typeof WeakRef !== "function") {
            // older browsers don't support WeakRef
            return;
        }

        this.beforeUnloadListeners.push(new WeakRef(obj));
    }
}

const appContext = new AppContext(window.glob.isMainWindow);

// we should save all outstanding changes before the page/app is closed
$(window).on('beforeunload', () => {
    let allSaved = true;

    appContext.beforeUnloadListeners = appContext.beforeUnloadListeners.filter(wr => !!wr.deref());

    for (const weakRef of appContext.beforeUnloadListeners) {
        const component = weakRef.deref();

        if (!component) {
            continue;
        }

        if (!component.beforeUnloadEvent()) {
            console.log(`Component ${component.componentId} is not finished saving its state.`);

            toast.showMessage("Please wait for a couple of seconds for the save to finish, then you can try again.", 10000);

            allSaved = false;
        }
    }

    if (!allSaved) {
        return "some string";
    }
});

$(window).on('hashchange', function() {
    const {notePath, ntxId, viewScope} = linkService.parseNavigationStateFromUrl(window.location.href);

    if (notePath || ntxId) {
        appContext.tabManager.switchToNoteContext(ntxId, notePath, viewScope);
    }
});

export default appContext;