3949db26d7
* Fix return type * Pass search function as a constructor argument * Pass constructor as a details object For consistency with other complex constructors and improved semantics. * Convert _ignorePoints to a single optional function * Organize functions * Rename ignorePoints to ignorePoint
394 lines
12 KiB
JavaScript
394 lines
12 KiB
JavaScript
/*
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* Copyright (C) 2019-2020 Yomichan Authors
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* 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
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* DOM
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* TextSourceRange
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* docRangeFromPoint
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*/
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class TextScanner extends EventDispatcher {
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constructor({node, ignoreElements, ignorePoint, search}) {
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super();
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this._node = node;
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this._ignoreElements = ignoreElements;
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this._ignorePoint = ignorePoint;
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this._search = search;
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this._ignoreNodes = null;
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this._causeCurrent = null;
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this._scanTimerPromise = null;
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this._textSourceCurrent = null;
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this._textSourceCurrentSelected = false;
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this._pendingLookup = false;
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this._options = null;
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this._enabled = false;
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this._eventListeners = new EventListenerCollection();
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this._primaryTouchIdentifier = null;
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this._preventNextContextMenu = false;
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this._preventNextMouseDown = false;
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this._preventNextClick = false;
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this._preventScroll = false;
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this._canClearSelection = true;
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}
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get canClearSelection() {
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return this._canClearSelection;
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}
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set canClearSelection(value) {
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this._canClearSelection = value;
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}
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get ignoreNodes() {
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return this._ignoreNodes;
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}
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set ignoreNodes(value) {
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this._ignoreNodes = value;
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}
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get causeCurrent() {
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return this._causeCurrent;
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}
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setEnabled(enabled) {
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this._eventListeners.removeAllEventListeners();
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this._enabled = enabled;
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if (this._enabled) {
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this._hookEvents();
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} else {
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this.clearSelection(true);
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}
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}
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setOptions(options) {
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this._options = options;
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}
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async searchAt(x, y, cause) {
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try {
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this._scanTimerClear();
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if (this._pendingLookup) {
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return;
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}
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if (typeof this._ignorePoint === 'function' && await this._ignorePoint(x, y)) {
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return;
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}
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const textSource = docRangeFromPoint(x, y, this._options.scanning.deepDomScan);
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try {
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if (this._textSourceCurrent !== null && this._textSourceCurrent.equals(textSource)) {
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return;
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}
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this._pendingLookup = true;
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const result = await this._search(textSource, cause);
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if (result !== null) {
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this._causeCurrent = cause;
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this.setCurrentTextSource(textSource);
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}
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this._pendingLookup = false;
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} finally {
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if (textSource !== null) {
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textSource.cleanup();
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}
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}
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} catch (e) {
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yomichan.logError(e);
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}
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}
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getTextSourceContent(textSource, length) {
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const clonedTextSource = textSource.clone();
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clonedTextSource.setEndOffset(length);
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if (this._ignoreNodes !== null && clonedTextSource.range) {
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length = clonedTextSource.text().length;
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while (clonedTextSource.range && length > 0) {
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const nodes = TextSourceRange.getNodesInRange(clonedTextSource.range);
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if (!TextSourceRange.anyNodeMatchesSelector(nodes, this._ignoreNodes)) {
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break;
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}
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--length;
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clonedTextSource.setEndOffset(length);
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}
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}
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return clonedTextSource.text();
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}
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clearSelection(passive) {
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if (!this._canClearSelection) { return; }
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if (this._textSourceCurrent !== null) {
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if (this._textSourceCurrentSelected) {
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this._textSourceCurrent.deselect();
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}
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this._textSourceCurrent = null;
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this._textSourceCurrentSelected = false;
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}
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this.trigger('clearSelection', {passive});
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}
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getCurrentTextSource() {
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return this._textSourceCurrent;
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}
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setCurrentTextSource(textSource) {
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this._textSourceCurrent = textSource;
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if (this._options.scanning.selectText) {
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this._textSourceCurrent.select();
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this._textSourceCurrentSelected = true;
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} else {
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this._textSourceCurrentSelected = false;
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}
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}
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// Private
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_onMouseOver(e) {
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if (this._ignoreElements().includes(e.target)) {
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this._scanTimerClear();
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}
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}
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_onMouseMove(e) {
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this._scanTimerClear();
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if (this._pendingLookup || DOM.isMouseButtonDown(e, 'primary')) {
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return;
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}
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const modifiers = DOM.getActiveModifiers(e);
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this.trigger('activeModifiersChanged', {modifiers});
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const scanningOptions = this._options.scanning;
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const scanningModifier = scanningOptions.modifier;
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if (!(
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this._isScanningModifierPressed(scanningModifier, e) ||
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(scanningOptions.middleMouse && DOM.isMouseButtonDown(e, 'auxiliary'))
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)) {
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return;
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}
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const search = async () => {
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if (scanningModifier === 'none') {
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if (!await this._scanTimerWait()) {
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// Aborted
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return;
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}
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}
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await this.searchAt(e.clientX, e.clientY, 'mouse');
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};
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search();
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}
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_onMouseDown(e) {
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if (this._preventNextMouseDown) {
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this._preventNextMouseDown = false;
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this._preventNextClick = true;
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e.preventDefault();
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e.stopPropagation();
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return false;
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}
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if (DOM.isMouseButtonDown(e, 'primary')) {
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this._scanTimerClear();
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this.clearSelection(false);
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}
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}
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_onMouseOut() {
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this._scanTimerClear();
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}
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_onClick(e) {
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if (this._preventNextClick) {
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this._preventNextClick = false;
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e.preventDefault();
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e.stopPropagation();
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return false;
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}
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}
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_onAuxClick() {
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this._preventNextContextMenu = false;
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}
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_onContextMenu(e) {
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if (this._preventNextContextMenu) {
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this._preventNextContextMenu = false;
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e.preventDefault();
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e.stopPropagation();
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return false;
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}
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}
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_onTouchStart(e) {
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if (this._primaryTouchIdentifier !== null || e.changedTouches.length === 0) {
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return;
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}
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this._preventScroll = false;
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this._preventNextContextMenu = false;
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this._preventNextMouseDown = false;
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this._preventNextClick = false;
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const primaryTouch = e.changedTouches[0];
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if (DOM.isPointInSelection(primaryTouch.clientX, primaryTouch.clientY, window.getSelection())) {
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return;
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}
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this._primaryTouchIdentifier = primaryTouch.identifier;
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if (this._pendingLookup) {
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return;
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}
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const textSourceCurrentPrevious = this._textSourceCurrent !== null ? this._textSourceCurrent.clone() : null;
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this.searchAt(primaryTouch.clientX, primaryTouch.clientY, 'touchStart')
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.then(() => {
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if (
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this._textSourceCurrent === null ||
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this._textSourceCurrent.equals(textSourceCurrentPrevious)
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) {
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return;
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}
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this._preventScroll = true;
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this._preventNextContextMenu = true;
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this._preventNextMouseDown = true;
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});
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}
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_onTouchEnd(e) {
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if (
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this._primaryTouchIdentifier === null ||
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this._getTouch(e.changedTouches, this._primaryTouchIdentifier) === null
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) {
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return;
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}
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this._primaryTouchIdentifier = null;
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this._preventScroll = false;
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this._preventNextClick = false;
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// Don't revert context menu and mouse down prevention, since these events can occur after the touch has ended.
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// I.e. this._preventNextContextMenu and this._preventNextMouseDown should not be assigned to false.
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}
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_onTouchCancel(e) {
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this._onTouchEnd(e);
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}
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_onTouchMove(e) {
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if (!this._preventScroll || !e.cancelable || this._primaryTouchIdentifier === null) {
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return;
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}
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const primaryTouch = this._getTouch(e.changedTouches, this._primaryTouchIdentifier);
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if (primaryTouch === null) {
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return;
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}
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this.searchAt(primaryTouch.clientX, primaryTouch.clientY, 'touchMove');
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e.preventDefault(); // Disable scroll
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}
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async _scanTimerWait() {
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const delay = this._options.scanning.delay;
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const promise = promiseTimeout(delay, true);
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this._scanTimerPromise = promise;
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try {
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return await promise;
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} finally {
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if (this._scanTimerPromise === promise) {
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this._scanTimerPromise = null;
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}
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}
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}
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_scanTimerClear() {
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if (this._scanTimerPromise !== null) {
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this._scanTimerPromise.resolve(false);
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this._scanTimerPromise = null;
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}
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}
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_hookEvents() {
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const eventListenerInfos = this._getMouseEventListeners();
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if (this._options.scanning.touchInputEnabled) {
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eventListenerInfos.push(...this._getTouchEventListeners());
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}
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for (const [node, type, listener, options] of eventListenerInfos) {
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this._eventListeners.addEventListener(node, type, listener, options);
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}
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}
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_getMouseEventListeners() {
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return [
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[this._node, 'mousedown', this._onMouseDown.bind(this)],
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[this._node, 'mousemove', this._onMouseMove.bind(this)],
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[this._node, 'mouseover', this._onMouseOver.bind(this)],
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[this._node, 'mouseout', this._onMouseOut.bind(this)]
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];
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}
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_getTouchEventListeners() {
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return [
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[this._node, 'click', this._onClick.bind(this)],
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[this._node, 'auxclick', this._onAuxClick.bind(this)],
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[this._node, 'touchstart', this._onTouchStart.bind(this)],
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[this._node, 'touchend', this._onTouchEnd.bind(this)],
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[this._node, 'touchcancel', this._onTouchCancel.bind(this)],
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[this._node, 'touchmove', this._onTouchMove.bind(this), {passive: false}],
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[this._node, 'contextmenu', this._onContextMenu.bind(this)]
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];
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}
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_isScanningModifierPressed(scanningModifier, mouseEvent) {
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switch (scanningModifier) {
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case 'alt': return mouseEvent.altKey;
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case 'ctrl': return mouseEvent.ctrlKey;
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case 'shift': return mouseEvent.shiftKey;
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case 'meta': return mouseEvent.metaKey;
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case 'none': return true;
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default: return false;
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}
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}
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_getTouch(touchList, identifier) {
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for (const touch of touchList) {
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if (touch.identifier === identifier) {
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return touch;
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}
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}
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return null;
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}
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}
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