yomichan/ext/fg/js/frontend.js

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JavaScript
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/*
* Copyright (C) 2016-2020 Yomichan Authors
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*
* 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
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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/* global
* TextScanner
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* apiBroadcastTab
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* apiGetZoom
* apiKanjiFind
* apiOptionsGet
* apiTermsFind
* docSentenceExtract
*/
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class Frontend {
constructor(popup, getUrl=null) {
this._id = yomichan.generateId(16);
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this.popup = popup;
this._getUrl = getUrl;
this._disabledOverride = false;
this._options = null;
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this._pageZoomFactor = 1.0;
this._contentScale = 1.0;
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this._orphaned = false;
this._lastShowPromise = Promise.resolve();
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this._enabledEventListeners = new EventListenerCollection();
this._textScanner = new TextScanner(
window,
() => this.popup.isProxy() ? [] : [this.popup.getContainer()],
[(x, y) => this.popup.containsPoint(x, y)]
);
this._textScanner.onSearchSource = this.onSearchSource.bind(this);
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this._windowMessageHandlers = new Map([
['popupClose', () => this._textScanner.clearSelection(false)],
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['selectionCopy', () => document.execCommand('copy')]
]);
this._runtimeMessageHandlers = new Map([
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['popupSetVisibleOverride', ({visible}) => { this.popup.setVisibleOverride(visible); }],
['rootPopupRequestInformationBroadcast', () => { this._broadcastRootPopupInformation(); }],
['requestDocumentInformationBroadcast', ({uniqueId}) => { this._broadcastDocumentInformation(uniqueId); }]
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]);
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}
get canClearSelection() {
return this._textScanner.canClearSelection;
}
set canClearSelection(value) {
this._textScanner.canClearSelection = value;
}
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async prepare() {
try {
await this.updateOptions();
const {zoomFactor} = await apiGetZoom();
this._pageZoomFactor = zoomFactor;
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window.addEventListener('resize', this.onResize.bind(this), false);
const visualViewport = window.visualViewport;
if (visualViewport !== null && typeof visualViewport === 'object') {
window.visualViewport.addEventListener('scroll', this.onVisualViewportScroll.bind(this));
window.visualViewport.addEventListener('resize', this.onVisualViewportResize.bind(this));
}
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yomichan.on('orphaned', this.onOrphaned.bind(this));
yomichan.on('optionsUpdated', this.updateOptions.bind(this));
yomichan.on('zoomChanged', this.onZoomChanged.bind(this));
chrome.runtime.onMessage.addListener(this.onRuntimeMessage.bind(this));
this._textScanner.on('clearSelection', this.onClearSelection.bind(this));
this._updateContentScale();
this._broadcastRootPopupInformation();
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} catch (e) {
yomichan.logError(e);
}
}
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onResize() {
this._updatePopupPosition();
}
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onWindowMessage(e) {
const action = e.data;
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const handler = this._windowMessageHandlers.get(action);
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if (typeof handler !== 'function') { return false; }
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handler();
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}
onRuntimeMessage({action, params}, sender, callback) {
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const {targetPopupId} = params || {};
if (typeof targetPopupId !== 'undefined' && targetPopupId !== this.popup.id) { return; }
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const handler = this._runtimeMessageHandlers.get(action);
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if (typeof handler !== 'function') { return false; }
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const result = handler(params, sender);
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callback(result);
return false;
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}
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onOrphaned() {
this._orphaned = true;
}
onZoomChanged({newZoomFactor}) {
this._pageZoomFactor = newZoomFactor;
this._updateContentScale();
}
onVisualViewportScroll() {
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this._updatePopupPosition();
}
onVisualViewportResize() {
this._updateContentScale();
}
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setDisabledOverride(disabled) {
this._disabledOverride = disabled;
this._updateTextScannerEnabled();
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}
async setPopup(popup) {
this._textScanner.clearSelection(true);
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this.popup = popup;
await popup.setOptionsContext(await this.getOptionsContext(), this._id);
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}
async updateOptions() {
const optionsContext = await this.getOptionsContext();
this._options = await apiOptionsGet(optionsContext);
this._textScanner.setOptions(this._options);
this._updateTextScannerEnabled();
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const ignoreNodes = ['.scan-disable', '.scan-disable *'];
if (!this._options.scanning.enableOnPopupExpressions) {
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ignoreNodes.push('.source-text', '.source-text *');
}
this._textScanner.ignoreNodes = ignoreNodes.join(',');
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await this.popup.setOptionsContext(optionsContext, this._id);
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this._updateContentScale();
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const textSourceCurrent = this._textScanner.getCurrentTextSource();
const causeCurrent = this._textScanner.causeCurrent;
if (textSourceCurrent !== null && causeCurrent !== null) {
await this.onSearchSource(textSourceCurrent, causeCurrent);
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}
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}
async setTextSource(textSource) {
await this.onSearchSource(textSource, 'script');
this._textScanner.setCurrentTextSource(textSource);
}
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async onSearchSource(textSource, cause) {
let results = null;
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try {
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if (textSource !== null) {
const optionsContext = await this.getOptionsContext();
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results = (
await this.findTerms(textSource, optionsContext) ||
await this.findKanji(textSource, optionsContext)
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);
if (results !== null) {
const focus = (cause === 'mouse');
this.showContent(textSource, focus, results.definitions, results.type, optionsContext);
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}
}
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} catch (e) {
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if (this._orphaned) {
if (textSource !== null && this._options.scanning.modifier !== 'none') {
this._showPopupContent(textSource, await this.getOptionsContext(), 'orphaned');
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}
} else {
yomichan.logError(e);
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}
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} finally {
if (results === null && this._options.scanning.autoHideResults) {
this._textScanner.clearSelection(false);
}
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}
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return results;
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}
showContent(textSource, focus, definitions, type, optionsContext) {
const {url} = optionsContext;
const sentence = docSentenceExtract(textSource, this._options.anki.sentenceExt);
this._showPopupContent(
textSource,
optionsContext,
type,
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{definitions, context: {sentence, url, focus, disableHistory: true}}
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);
}
showContentCompleted() {
return this._lastShowPromise;
}
async findTerms(textSource, optionsContext) {
this._textScanner.setTextSourceScanLength(textSource, this._options.scanning.length);
const searchText = textSource.text();
if (searchText.length === 0) { return null; }
const {definitions, length} = await apiTermsFind(searchText, {}, optionsContext);
if (definitions.length === 0) { return null; }
textSource.setEndOffset(length);
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return {definitions, type: 'terms'};
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}
async findKanji(textSource, optionsContext) {
this._textScanner.setTextSourceScanLength(textSource, 1);
const searchText = textSource.text();
if (searchText.length === 0) { return null; }
const definitions = await apiKanjiFind(searchText, optionsContext);
if (definitions.length === 0) { return null; }
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return {definitions, type: 'kanji'};
}
onClearSelection({passive}) {
this.popup.hide(!passive);
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this.popup.clearAutoPlayTimer();
}
async getOptionsContext() {
const url = this._getUrl !== null ? await this._getUrl() : window.location.href;
const depth = this.popup.depth;
return {depth, url};
}
_showPopupContent(textSource, optionsContext, type=null, details=null) {
const context = {optionsContext, source: this._id};
this._lastShowPromise = this.popup.showContent(
textSource.getRect(),
textSource.getWritingMode(),
type,
details,
context
);
return this._lastShowPromise;
}
_updateTextScannerEnabled() {
const enabled = (
this._options.general.enable &&
this.popup.depth <= this._options.scanning.popupNestingMaxDepth &&
!this._disabledOverride
);
this._enabledEventListeners.removeAllEventListeners();
this._textScanner.setEnabled(enabled);
if (enabled) {
this._enabledEventListeners.addEventListener(window, 'message', this.onWindowMessage.bind(this));
}
}
_updateContentScale() {
const {popupScalingFactor, popupScaleRelativeToPageZoom, popupScaleRelativeToVisualViewport} = this._options.general;
let contentScale = popupScalingFactor;
if (popupScaleRelativeToPageZoom) {
contentScale /= this._pageZoomFactor;
}
if (popupScaleRelativeToVisualViewport) {
const visualViewport = window.visualViewport;
const visualViewportScale = (visualViewport !== null && typeof visualViewport === 'object' ? visualViewport.scale : 1.0);
contentScale /= visualViewportScale;
}
if (contentScale === this._contentScale) { return; }
this._contentScale = contentScale;
this.popup.setContentScale(this._contentScale);
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this._updatePopupPosition();
}
_broadcastRootPopupInformation() {
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if (!this.popup.isProxy() && this.popup.depth === 0 && this.popup.frameId === 0) {
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apiBroadcastTab('rootPopupInformation', {popupId: this.popup.id, frameId: this.popup.frameId});
}
}
_broadcastDocumentInformation(uniqueId) {
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apiBroadcastTab('documentInformationBroadcast', {
uniqueId,
frameId: this.popup.frameId,
title: document.title
});
}
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async _updatePopupPosition() {
const textSource = this._textScanner.getCurrentTextSource();
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if (textSource !== null && await this.popup.isVisible()) {
this._showPopupContent(textSource, await this.getOptionsContext());
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}
}
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}