/* * Copyright (C) 2019-2020 Yomichan Authors * * 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 <https://www.gnu.org/licenses/>. */ /* global * DOM * docRangeFromPoint */ class TextScanner extends EventDispatcher { constructor({node, ignoreElements, ignorePoint, search}) { super(); this._node = node; this._ignoreElements = ignoreElements; this._ignorePoint = ignorePoint; this._search = search; this._isPrepared = false; this._ignoreNodes = null; this._causeCurrent = null; this._scanTimerPromise = null; this._textSourceCurrent = null; this._textSourceCurrentSelected = false; this._pendingLookup = false; this._options = null; this._enabled = false; this._eventListeners = new EventListenerCollection(); this._primaryTouchIdentifier = null; this._preventNextContextMenu = false; this._preventNextMouseDown = false; this._preventNextClick = false; this._preventScroll = false; this._canClearSelection = true; } get canClearSelection() { return this._canClearSelection; } set canClearSelection(value) { this._canClearSelection = value; } get ignoreNodes() { return this._ignoreNodes; } set ignoreNodes(value) { this._ignoreNodes = value; } get causeCurrent() { return this._causeCurrent; } prepare() { this._isPrepared = true; this.setEnabled(this._enabled); } setEnabled(enabled) { this._eventListeners.removeAllEventListeners(); this._enabled = enabled; if (this._enabled && this._isPrepared) { this._hookEvents(); } else { this.clearSelection(true); } } setOptions(options) { this._options = options; } async searchAt(x, y, cause) { try { this._scanTimerClear(); if (this._pendingLookup) { return; } if (typeof this._ignorePoint === 'function' && await this._ignorePoint(x, y)) { return; } const textSource = docRangeFromPoint(x, y, this._options.scanning.deepDomScan); try { if (this._textSourceCurrent !== null && this._textSourceCurrent.equals(textSource)) { return; } this._pendingLookup = true; const result = await this._search(textSource, cause); if (result !== null) { this._causeCurrent = cause; this.setCurrentTextSource(textSource); } this._pendingLookup = false; } finally { if (textSource !== null) { textSource.cleanup(); } } } catch (e) { yomichan.logError(e); } } getTextSourceContent(textSource, length, layoutAwareScan) { const clonedTextSource = textSource.clone(); clonedTextSource.setEndOffset(length, layoutAwareScan); if (this._ignoreNodes !== null && clonedTextSource.range) { length = clonedTextSource.text().length; while (clonedTextSource.range && length > 0) { const nodes = DOM.getNodesInRange(clonedTextSource.range); if (!DOM.anyNodeMatchesSelector(nodes, this._ignoreNodes)) { break; } --length; clonedTextSource.setEndOffset(length, layoutAwareScan); } } return clonedTextSource.text(); } clearSelection(passive) { if (!this._canClearSelection) { return; } if (this._textSourceCurrent !== null) { if (this._textSourceCurrentSelected) { this._textSourceCurrent.deselect(); } this._textSourceCurrent = null; this._textSourceCurrentSelected = false; } this.trigger('clearSelection', {passive}); } getCurrentTextSource() { return this._textSourceCurrent; } setCurrentTextSource(textSource) { this._textSourceCurrent = textSource; if (this._options.scanning.selectText) { this._textSourceCurrent.select(); this._textSourceCurrentSelected = true; } else { this._textSourceCurrentSelected = false; } } // Private _onMouseOver(e) { if (this._ignoreElements().includes(e.target)) { this._scanTimerClear(); } } _onMouseMove(e) { this._scanTimerClear(); if (this._pendingLookup || DOM.isMouseButtonDown(e, 'primary')) { return; } const modifiers = DOM.getActiveModifiers(e); this.trigger('activeModifiersChanged', {modifiers}); const scanningOptions = this._options.scanning; const scanningModifier = scanningOptions.modifier; if (!( this._isScanningModifierPressed(scanningModifier, e) || (scanningOptions.middleMouse && DOM.isMouseButtonDown(e, 'auxiliary')) )) { return; } const search = async () => { if (scanningModifier === 'none') { if (!await this._scanTimerWait()) { // Aborted return; } } await this.searchAt(e.clientX, e.clientY, 'mouse'); }; search(); } _onMouseDown(e) { if (this._preventNextMouseDown) { this._preventNextMouseDown = false; this._preventNextClick = true; e.preventDefault(); e.stopPropagation(); return false; } if (DOM.isMouseButtonDown(e, 'primary')) { this._scanTimerClear(); this.clearSelection(false); } } _onMouseOut() { this._scanTimerClear(); } _onClick(e) { if (this._preventNextClick) { this._preventNextClick = false; e.preventDefault(); e.stopPropagation(); return false; } } _onAuxClick() { this._preventNextContextMenu = false; } _onContextMenu(e) { if (this._preventNextContextMenu) { this._preventNextContextMenu = false; e.preventDefault(); e.stopPropagation(); return false; } } _onTouchStart(e) { if (this._primaryTouchIdentifier !== null || e.changedTouches.length === 0) { return; } this._preventScroll = false; this._preventNextContextMenu = false; this._preventNextMouseDown = false; this._preventNextClick = false; const primaryTouch = e.changedTouches[0]; if (DOM.isPointInSelection(primaryTouch.clientX, primaryTouch.clientY, window.getSelection())) { return; } this._primaryTouchIdentifier = primaryTouch.identifier; if (this._pendingLookup) { return; } const textSourceCurrentPrevious = this._textSourceCurrent !== null ? this._textSourceCurrent.clone() : null; this.searchAt(primaryTouch.clientX, primaryTouch.clientY, 'touchStart') .then(() => { if ( this._textSourceCurrent === null || this._textSourceCurrent.equals(textSourceCurrentPrevious) ) { return; } this._preventScroll = true; this._preventNextContextMenu = true; this._preventNextMouseDown = true; }); } _onTouchEnd(e) { if ( this._primaryTouchIdentifier === null || this._getTouch(e.changedTouches, this._primaryTouchIdentifier) === null ) { return; } this._primaryTouchIdentifier = null; this._preventScroll = false; this._preventNextClick = false; // Don't revert context menu and mouse down prevention, since these events can occur after the touch has ended. // I.e. this._preventNextContextMenu and this._preventNextMouseDown should not be assigned to false. } _onTouchCancel(e) { this._onTouchEnd(e); } _onTouchMove(e) { if (!this._preventScroll || !e.cancelable || this._primaryTouchIdentifier === null) { return; } const primaryTouch = this._getTouch(e.changedTouches, this._primaryTouchIdentifier); if (primaryTouch === null) { return; } this.searchAt(primaryTouch.clientX, primaryTouch.clientY, 'touchMove'); e.preventDefault(); // Disable scroll } async _scanTimerWait() { const delay = this._options.scanning.delay; const promise = promiseTimeout(delay, true); this._scanTimerPromise = promise; try { return await promise; } finally { if (this._scanTimerPromise === promise) { this._scanTimerPromise = null; } } } _scanTimerClear() { if (this._scanTimerPromise !== null) { this._scanTimerPromise.resolve(false); this._scanTimerPromise = null; } } _hookEvents() { const eventListenerInfos = this._getMouseEventListeners(); if (this._options.scanning.touchInputEnabled) { eventListenerInfos.push(...this._getTouchEventListeners()); } for (const [node, type, listener, options] of eventListenerInfos) { this._eventListeners.addEventListener(node, type, listener, options); } } _getMouseEventListeners() { return [ [this._node, 'mousedown', this._onMouseDown.bind(this)], [this._node, 'mousemove', this._onMouseMove.bind(this)], [this._node, 'mouseover', this._onMouseOver.bind(this)], [this._node, 'mouseout', this._onMouseOut.bind(this)] ]; } _getTouchEventListeners() { return [ [this._node, 'click', this._onClick.bind(this)], [this._node, 'auxclick', this._onAuxClick.bind(this)], [this._node, 'touchstart', this._onTouchStart.bind(this)], [this._node, 'touchend', this._onTouchEnd.bind(this)], [this._node, 'touchcancel', this._onTouchCancel.bind(this)], [this._node, 'touchmove', this._onTouchMove.bind(this), {passive: false}], [this._node, 'contextmenu', this._onContextMenu.bind(this)] ]; } _isScanningModifierPressed(scanningModifier, mouseEvent) { switch (scanningModifier) { case 'alt': return mouseEvent.altKey; case 'ctrl': return mouseEvent.ctrlKey; case 'shift': return mouseEvent.shiftKey; case 'meta': return mouseEvent.metaKey; case 'none': return true; default: return false; } } _getTouch(touchList, identifier) { for (const touch of touchList) { if (touch.identifier === identifier) { return touch; } } return null; } }