yomichan/ext/fg/js/frontend.js

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JavaScript
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/*
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* Copyright (C) 2016-2017 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
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
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class Frontend {
constructor(popup, ignoreNodes) {
this.popup = popup;
this.popupTimer = null;
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this.textSourceLast = null;
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this.pendingLookup = false;
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this.options = null;
this.ignoreNodes = (Array.isArray(ignoreNodes) && ignoreNodes.length > 0 ? ignoreNodes.join(',') : null);
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this.optionsContext = {
depth: popup.depth,
url: popup.url
};
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this.primaryTouchIdentifier = null;
this.contextMenuChecking = false;
this.contextMenuPrevent = false;
this.contextMenuPreviousRange = null;
this.mouseDownPrevent = false;
this.clickPrevent = false;
this.scrollPrevent = false;
this.enabled = false;
this.eventListeners = [];
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}
static create() {
const initializationData = window.frontendInitializationData;
const isNested = (initializationData !== null && typeof initializationData === 'object');
const {id, depth, parentFrameId, ignoreNodes, url} = isNested ? initializationData : {};
const popup = isNested ? new PopupProxy(depth + 1, id, parentFrameId, url) : PopupProxyHost.instance.createPopup(null);
const frontend = new Frontend(popup, ignoreNodes);
frontend.prepare();
return frontend;
}
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async prepare() {
try {
await this.updateOptions();
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chrome.runtime.onMessage.addListener(this.onRuntimeMessage.bind(this));
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} catch (e) {
this.onError(e);
}
}
onMouseOver(e) {
if (e.target === this.popup.container && this.popupTimer !== null) {
this.popupTimerClear();
}
}
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onMouseMove(e) {
this.popupTimerClear();
if (
this.pendingLookup ||
(e.buttons & 0x1) !== 0x0 // Left mouse button
) {
return;
}
const scanningOptions = this.options.scanning;
const scanningModifier = scanningOptions.modifier;
if (!(
Frontend.isScanningModifierPressed(scanningModifier, e) ||
(scanningOptions.middleMouse && (e.buttons & 0x4) !== 0x0) // Middle mouse button
)) {
return;
}
const search = async () => {
try {
await this.searchAt(e.clientX, e.clientY, 'mouse');
} catch (e) {
this.onError(e);
}
};
if (scanningModifier === 'none') {
this.popupTimerSet(search);
} else {
search();
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}
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}
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onMouseDown(e) {
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if (this.mouseDownPrevent) {
this.setMouseDownPrevent(false, false);
this.setClickPrevent(true);
e.preventDefault();
e.stopPropagation();
return false;
}
this.popupTimerClear();
this.searchClear(true);
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}
onMouseOut(e) {
this.popupTimerClear();
}
onWindowMessage(e) {
const action = e.data;
const handlers = Frontend.windowMessageHandlers;
if (handlers.hasOwnProperty(action)) {
const handler = handlers[action];
handler(this);
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}
}
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onResize() {
this.searchClear(false);
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}
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onClick(e) {
if (this.clickPrevent) {
this.setClickPrevent(false);
e.preventDefault();
e.stopPropagation();
return false;
}
}
onTouchStart(e) {
if (this.primaryTouchIdentifier !== null && this.getIndexOfTouch(e.touches, this.primaryTouchIdentifier) >= 0) {
return;
}
let touch = this.getPrimaryTouch(e.changedTouches);
if (this.selectionContainsPoint(window.getSelection(), touch.clientX, touch.clientY)) {
touch = null;
}
this.setPrimaryTouch(touch);
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}
onTouchEnd(e) {
if (this.primaryTouchIdentifier === null) {
return;
}
if (this.getIndexOfTouch(e.changedTouches, this.primaryTouchIdentifier) < 0) {
return;
}
this.setPrimaryTouch(this.getPrimaryTouch(this.excludeTouches(e.touches, e.changedTouches)));
}
onTouchCancel(e) {
this.onTouchEnd(e);
}
onTouchMove(e) {
if (!this.scrollPrevent || !e.cancelable || this.primaryTouchIdentifier === null) {
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return;
}
const touches = e.changedTouches;
const index = this.getIndexOfTouch(touches, this.primaryTouchIdentifier);
if (index < 0) {
return;
}
const touch = touches[index];
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this.searchFromTouch(touch.clientX, touch.clientY, 'touchMove');
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e.preventDefault(); // Disable scroll
}
onContextMenu(e) {
if (this.contextMenuPrevent) {
this.setContextMenuPrevent(false, false);
e.preventDefault();
e.stopPropagation();
return false;
}
}
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onAfterSearch(newRange, cause, searched, success) {
if (cause === 'mouse') {
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return;
}
if (
!this.contextMenuChecking ||
(this.contextMenuPreviousRange === null ? newRange === null : this.contextMenuPreviousRange.equals(newRange))) {
return;
}
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if (cause === 'touchStart' && newRange !== null) {
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this.scrollPrevent = true;
}
this.setContextMenuPrevent(true, false);
this.setMouseDownPrevent(true, false);
this.contextMenuChecking = false;
}
onRuntimeMessage({action, params}, sender, callback) {
const handlers = Frontend.runtimeMessageHandlers;
if (handlers.hasOwnProperty(action)) {
const handler = handlers[action];
handler(this, params);
callback();
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}
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}
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onError(error) {
console.log(error);
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}
setEnabled(enabled) {
if (enabled) {
if (!this.enabled) {
this.hookEvents();
this.enabled = true;
}
} else {
if (this.enabled) {
this.clearEventListeners();
this.enabled = false;
}
this.searchClear(false);
}
}
hookEvents() {
this.addEventListener(window, 'message', this.onWindowMessage.bind(this));
this.addEventListener(window, 'mousedown', this.onMouseDown.bind(this));
this.addEventListener(window, 'mousemove', this.onMouseMove.bind(this));
this.addEventListener(window, 'mouseover', this.onMouseOver.bind(this));
this.addEventListener(window, 'mouseout', this.onMouseOut.bind(this));
this.addEventListener(window, 'resize', this.onResize.bind(this));
if (this.options.scanning.touchInputEnabled) {
this.addEventListener(window, 'click', this.onClick.bind(this));
this.addEventListener(window, 'touchstart', this.onTouchStart.bind(this));
this.addEventListener(window, 'touchend', this.onTouchEnd.bind(this));
this.addEventListener(window, 'touchcancel', this.onTouchCancel.bind(this));
this.addEventListener(window, 'touchmove', this.onTouchMove.bind(this), {passive: false});
this.addEventListener(window, 'contextmenu', this.onContextMenu.bind(this));
}
}
addEventListener(node, type, listener, options) {
node.addEventListener(type, listener, options);
this.eventListeners.push([node, type, listener, options]);
}
clearEventListeners() {
for (const [node, type, listener, options] of this.eventListeners) {
node.removeEventListener(type, listener, options);
}
this.eventListeners = [];
}
async updateOptions() {
this.options = await apiOptionsGet(this.getOptionsContext());
this.setEnabled(this.options.general.enable);
}
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popupTimerSet(callback) {
const delay = this.options.scanning.delay;
if (delay > 0) {
this.popupTimer = window.setTimeout(callback, delay);
} else {
Promise.resolve().then(callback);
}
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}
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popupTimerClear() {
if (this.popupTimer !== null) {
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window.clearTimeout(this.popupTimer);
this.popupTimer = null;
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}
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}
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async searchAt(x, y, cause) {
if (this.pendingLookup || await this.popup.containsPoint(x, y)) {
return;
}
const textSource = docRangeFromPoint(x, y, this.options);
let hideResults = textSource === null;
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let searched = false;
let success = false;
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try {
if (!hideResults && (!this.textSourceLast || !this.textSourceLast.equals(textSource))) {
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searched = true;
this.pendingLookup = true;
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const focus = (cause === 'mouse');
hideResults = !await this.searchTerms(textSource, focus) && !await this.searchKanji(textSource, focus);
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success = true;
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}
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} catch (e) {
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if (window.yomichan_orphaned) {
if (textSource && this.options.scanning.modifier !== 'none') {
this.popup.showOrphaned(
textSource.getRect(),
textSource.getWritingMode(),
this.options
);
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}
} else {
this.onError(e);
}
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} finally {
if (textSource !== null) {
textSource.cleanup();
}
if (hideResults && this.options.scanning.autoHideResults) {
this.searchClear(true);
}
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this.pendingLookup = false;
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this.onAfterSearch(this.textSourceLast, cause, searched, success);
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}
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}
async searchTerms(textSource, focus) {
this.setTextSourceScanLength(textSource, this.options.scanning.length);
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const searchText = textSource.text();
if (searchText.length === 0) {
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return false;
}
const {definitions, length} = await apiTermsFind(searchText, this.getOptionsContext());
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if (definitions.length === 0) {
return false;
}
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textSource.setEndOffset(length);
const sentence = docSentenceExtract(textSource, this.options.anki.sentenceExt);
const url = window.location.href;
this.popup.termsShow(
textSource.getRect(),
textSource.getWritingMode(),
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definitions,
this.options,
{sentence, url, focus}
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);
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this.textSourceLast = textSource;
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if (this.options.scanning.selectText) {
textSource.select();
}
return true;
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}
async searchKanji(textSource, focus) {
this.setTextSourceScanLength(textSource, 1);
const searchText = textSource.text();
if (searchText.length === 0) {
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return false;
}
const definitions = await apiKanjiFind(searchText, this.getOptionsContext());
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if (definitions.length === 0) {
return false;
}
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const sentence = docSentenceExtract(textSource, this.options.anki.sentenceExt);
const url = window.location.href;
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this.popup.kanjiShow(
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textSource.getRect(),
textSource.getWritingMode(),
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definitions,
this.options,
{sentence, url, focus}
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);
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this.textSourceLast = textSource;
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if (this.options.scanning.selectText) {
textSource.select();
}
return true;
}
searchClear(changeFocus) {
this.popup.hide(changeFocus);
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this.popup.clearAutoPlayTimer();
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if (this.options.scanning.selectText && this.textSourceLast) {
this.textSourceLast.deselect();
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}
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this.textSourceLast = null;
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}
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getPrimaryTouch(touchList) {
return touchList.length > 0 ? touchList[0] : null;
}
getIndexOfTouch(touchList, identifier) {
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for (let i in touchList) {
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let t = touchList[i];
if (t.identifier === identifier) {
return i;
}
}
return -1;
}
excludeTouches(touchList, excludeTouchList) {
const result = [];
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for (let r of touchList) {
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if (this.getIndexOfTouch(excludeTouchList, r.identifier) < 0) {
result.push(r);
}
}
return result;
}
setPrimaryTouch(touch) {
if (touch === null) {
this.primaryTouchIdentifier = null;
this.contextMenuPreviousRange = null;
this.contextMenuChecking = false;
this.scrollPrevent = false;
this.setContextMenuPrevent(false, true);
this.setMouseDownPrevent(false, true);
this.setClickPrevent(false);
}
else {
this.primaryTouchIdentifier = touch.identifier;
this.contextMenuPreviousRange = this.textSourceLast ? this.textSourceLast.clone() : null;
this.contextMenuChecking = true;
this.scrollPrevent = false;
this.setContextMenuPrevent(false, false);
this.setMouseDownPrevent(false, false);
this.setClickPrevent(false);
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this.searchFromTouch(touch.clientX, touch.clientY, 'touchStart');
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}
}
setContextMenuPrevent(value, delay) {
if (!delay) {
this.contextMenuPrevent = value;
}
}
setMouseDownPrevent(value, delay) {
if (!delay) {
this.mouseDownPrevent = value;
}
}
setClickPrevent(value) {
this.clickPrevent = value;
}
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searchFromTouch(x, y, cause) {
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this.popupTimerClear();
if (this.pendingLookup) {
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return;
}
const search = async () => {
try {
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await this.searchAt(x, y, cause);
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} catch (e) {
this.onError(e);
}
};
search();
}
selectionContainsPoint(selection, x, y) {
for (let i = 0; i < selection.rangeCount; ++i) {
const range = selection.getRangeAt(i);
for (const rect of range.getClientRects()) {
if (x >= rect.left && x <= rect.right && y >= rect.top && y <= rect.bottom) {
return true;
}
}
}
return false;
}
setTextSourceScanLength(textSource, length) {
textSource.setEndOffset(length);
if (this.ignoreNodes === null || !textSource.range) {
return;
}
length = textSource.text().length;
while (textSource.range && length > 0) {
const nodes = TextSourceRange.getNodesInRange(textSource.range);
if (!TextSourceRange.anyNodeMatchesSelector(nodes, this.ignoreNodes)) {
break;
}
--length;
textSource.setEndOffset(length);
}
}
getOptionsContext() {
this.optionsContext.url = this.popup.url;
return this.optionsContext;
}
static isScanningModifierPressed(scanningModifier, mouseEvent) {
switch (scanningModifier) {
case 'alt': return mouseEvent.altKey;
case 'ctrl': return mouseEvent.ctrlKey;
case 'shift': return mouseEvent.shiftKey;
case 'none': return true;
default: return false;
}
}
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}
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Frontend.windowMessageHandlers = {
popupClose: (self) => {
self.searchClear(true);
},
selectionCopy: () => {
document.execCommand('copy');
}
};
Frontend.runtimeMessageHandlers = {
optionsUpdate: (self) => {
self.updateOptions();
},
popupSetVisibleOverride: (self, {visible}) => {
self.popup.setVisibleOverride(visible);
}
};
window.yomichan_frontend = Frontend.create();