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diff --git a/ext/bg/js/audio-ui.js b/ext/bg/js/audio-ui.js
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+/*
+ * Copyright (C) 2019 Alex Yatskov <alex@foosoft.net>
+ * Author: Alex Yatskov <alex@foosoft.net>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+class AudioSourceUI {
+ static instantiateTemplate(templateSelector) {
+ const template = document.querySelector(templateSelector);
+ const content = document.importNode(template.content, true);
+ return $(content.firstChild);
+ }
+}
+
+AudioSourceUI.Container = class Container {
+ constructor(audioSources, container, addButton) {
+ this.audioSources = audioSources;
+ this.container = container;
+ this.addButton = addButton;
+ this.children = [];
+
+ this.container.empty();
+
+ for (const audioSource of toIterable(audioSources)) {
+ this.children.push(new AudioSourceUI.AudioSource(this, audioSource, this.children.length));
+ }
+
+ this.addButton.on('click', () => this.onAddAudioSource());
+ }
+
+ cleanup() {
+ for (const child of this.children) {
+ child.cleanup();
+ }
+
+ this.addButton.off('click');
+ this.container.empty();
+ }
+
+ save() {
+ // Override
+ }
+
+ remove(child) {
+ const index = this.children.indexOf(child);
+ if (index < 0) {
+ return;
+ }
+
+ child.cleanup();
+ this.children.splice(index, 1);
+ this.audioSources.splice(index, 1);
+
+ for (let i = index; i < this.children.length; ++i) {
+ this.children[i].index = i;
+ }
+ }
+
+ onAddAudioSource() {
+ const audioSource = this.getUnusedAudioSource();
+ this.audioSources.push(audioSource);
+ this.save();
+ this.children.push(new AudioSourceUI.AudioSource(this, audioSource, this.children.length));
+ }
+
+ getUnusedAudioSource() {
+ const audioSourcesAvailable = [
+ 'jpod101',
+ 'jpod101-alternate',
+ 'jisho',
+ 'custom'
+ ];
+ for (const source of audioSourcesAvailable) {
+ if (this.audioSources.indexOf(source) < 0) {
+ return source;
+ }
+ }
+ return audioSourcesAvailable[0];
+ }
+};
+
+AudioSourceUI.AudioSource = class AudioSource {
+ constructor(parent, audioSource, index) {
+ this.parent = parent;
+ this.audioSource = audioSource;
+ this.index = index;
+
+ this.container = AudioSourceUI.instantiateTemplate('#audio-source-template').appendTo(parent.container);
+ this.select = this.container.find('.audio-source-select');
+ this.removeButton = this.container.find('.audio-source-remove');
+
+ this.select.val(audioSource);
+
+ this.select.on('change', () => this.onSelectChanged());
+ this.removeButton.on('click', () => this.onRemoveClicked());
+ }
+
+ cleanup() {
+ this.select.off('change');
+ this.removeButton.off('click');
+ this.container.remove();
+ }
+
+ save() {
+ this.parent.save();
+ }
+
+ onSelectChanged() {
+ this.audioSource = this.select.val();
+ this.parent.audioSources[this.index] = this.audioSource;
+ this.save();
+ }
+
+ onRemoveClicked() {
+ this.parent.remove(this);
+ this.save();
+ }
+};