yomichan/ext/fg/js/frontend.js

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/*
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* Copyright (C) 2016-2020 Alex Yatskov <alex@foosoft.net>
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* 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
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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 apiGetZoom, apiOptionsGet, apiTermsFind, apiKanjiFind, docSentenceExtract, TextScanner*/
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class Frontend extends TextScanner {
constructor(popup, ignoreNodes) {
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super(
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window,
ignoreNodes,
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popup.isProxy() ? [] : [popup.getContainer()],
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[(x, y) => this.popup.containsPoint(x, y)]
);
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this.popup = popup;
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this.options = null;
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this.optionsContext = {
depth: popup.depth,
url: popup.url
};
this._pageZoomFactor = 1.0;
this._contentScale = 1.0;
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this._orphaned = true;
this._lastShowPromise = Promise.resolve();
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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());
yomichan.on('optionsUpdated', () => this.updateOptions());
yomichan.on('zoomChanged', (e) => this.onZoomChanged(e));
chrome.runtime.onMessage.addListener(this.onRuntimeMessage.bind(this));
this._updateContentScale();
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} catch (e) {
this.onError(e);
}
}
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onResize() {
this._updatePopupPosition();
}
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onWindowMessage(e) {
const action = e.data;
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const handler = Frontend._windowMessageHandlers.get(action);
if (typeof handler !== 'function') { return false; }
handler(this);
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}
onRuntimeMessage({action, params}, sender, callback) {
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const handler = Frontend._runtimeMessageHandlers.get(action);
if (typeof handler !== 'function') { return false; }
const result = handler(this, params, sender);
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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getMouseEventListeners() {
return [
...super.getMouseEventListeners(),
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[window, 'message', this.onWindowMessage.bind(this)]
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];
}
async updateOptions() {
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this.setOptions(await apiOptionsGet(this.getOptionsContext()));
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await this.popup.setOptions(this.options);
this._updateContentScale();
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}
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async onSearchSource(textSource, cause) {
let results = null;
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try {
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if (textSource !== null) {
results = (
await this.findTerms(textSource) ||
await this.findKanji(textSource)
);
if (results !== null) {
const focus = (cause === 'mouse');
this.showContent(textSource, focus, results.definitions, results.type);
}
}
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} catch (e) {
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if (this._orphaned) {
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if (textSource !== null && this.options.scanning.modifier !== 'none') {
this._showPopupContent(textSource, 'orphaned');
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}
} else {
this.onError(e);
}
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} finally {
if (results === null && this.options.scanning.autoHideResults) {
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this.onSearchClear(true);
}
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}
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return results;
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}
showContent(textSource, focus, definitions, type) {
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const sentence = docSentenceExtract(textSource, this.options.anki.sentenceExt);
const url = window.location.href;
this._showPopupContent(
textSource,
type,
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{definitions, context: {sentence, url, focus, disableHistory: true}}
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);
}
showContentCompleted() {
return this._lastShowPromise;
}
async findTerms(textSource) {
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this.setTextSourceScanLength(textSource, this.options.scanning.length);
const searchText = textSource.text();
if (searchText.length === 0) { return null; }
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const {definitions, length} = await apiTermsFind(searchText, {}, this.getOptionsContext());
if (definitions.length === 0) { return null; }
textSource.setEndOffset(length);
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return {definitions, type: 'terms'};
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}
async findKanji(textSource) {
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this.setTextSourceScanLength(textSource, 1);
const searchText = textSource.text();
if (searchText.length === 0) { return null; }
const definitions = await apiKanjiFind(searchText, this.getOptionsContext());
if (definitions.length === 0) { return null; }
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return {definitions, type: 'kanji'};
}
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onSearchClear(changeFocus) {
this.popup.hide(changeFocus);
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this.popup.clearAutoPlayTimer();
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super.onSearchClear(changeFocus);
}
getOptionsContext() {
this.optionsContext.url = this.popup.url;
return this.optionsContext;
}
_showPopupContent(textSource, type=null, details=null) {
this._lastShowPromise = this.popup.showContent(
textSource.getRect(),
textSource.getWritingMode(),
type,
details
);
return this._lastShowPromise;
}
_updateContentScale() {
const {popupScalingFactor, popupScaleRelativeToPageZoom, popupScaleRelativeToVisualViewport} = this.options.general;
let contentScale = popupScalingFactor;
if (popupScaleRelativeToPageZoom) {
contentScale /= this._pageZoomFactor;
}
if (popupScaleRelativeToVisualViewport) {
contentScale /= Frontend._getVisualViewportScale();
}
if (contentScale === this._contentScale) { return; }
this._contentScale = contentScale;
this.popup.setContentScale(this._contentScale);
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this._updatePopupPosition();
}
async _updatePopupPosition() {
const textSource = this.getCurrentTextSource();
if (textSource !== null && await this.popup.isVisible()) {
this._showPopupContent(textSource);
}
}
static _getVisualViewportScale() {
const visualViewport = window.visualViewport;
return visualViewport !== null && typeof visualViewport === 'object' ? visualViewport.scale : 1.0;
}
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}
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Frontend._windowMessageHandlers = new Map([
['popupClose', (self) => self.onSearchClear(true)],
['selectionCopy', () => document.execCommand('copy')]
]);
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Frontend._runtimeMessageHandlers = new Map([
['popupSetVisibleOverride', (self, {visible}) => { self.popup.setVisibleOverride(visible); }]
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]);