blob: ec6302e57b6dcc610edc7c7b6e9963abed71c205 [file] [log] [blame]
// Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
// @dart = 2.9
part of swarmlib;
/// A simple news reader in Dart.
class Swarm extends App {
/// Flag to insure the onLoad isn't called when callback from initializeFromUrl
/// could occur before the document's onload event.
bool onLoadFired;
/// Collections of datafeeds to show per page. */
Sections sections;
/// The front page of the app. */
FrontView frontView;
/// Observable UI state. */
SwarmState state;
Swarm({bool useCannedData = false}) : onLoadFired = false {
Sections.initializeFromUrl(useCannedData, (currSections) {
sections = currSections;
state = SwarmState(sections);
// Catch user keypresses and decide whether to use them for the
// Streams app or pass them on to the browser.
document.onKeyUp.listen((e) {
if (frontView != null) {
/// Tells each data source to check the server for the latest data.
void refresh() {
// Hook up listeners about any data source additions or deletions. We don't
// differentiate additions or deletions just the fact that data feeds have
// changed. We might want more fidelity later.
for (var title in sections.sectionTitles) {
Section section = sections.findSection(title);
// TODO(terry): addChangeListener needs to return an id so previous
// listener can be removed, otherwise anonymous functions
// can't easily be used. See b/5063673
section.feeds.addChangeListener((data) {
// TODO(jacobr): implement this.
print("Refresh sections not impl yet.");
/// The page load event handler. */
void onLoad() {
onLoadFired = true;
/// Setup the application's world.
void setupApp() {
// TODO(terry): Should be able to spinup the app w/o waiting for data.
// If the document is already loaded so we can setup the app anytime.
// Otherwise, we'll wait to setup the world until the document is ready
// to render.
if (onLoadFired && state != null) {
// This call loads the initial data.
void render() {
frontView = FrontView(this);