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-rw-r--r--ext/js/dom/document-focus-controller.js110
-rw-r--r--ext/js/dom/document-util.js570
-rw-r--r--ext/js/dom/dom-data-binder.js234
-rw-r--r--ext/js/dom/html-template-collection.js78
-rw-r--r--ext/js/dom/panel-element.js103
-rw-r--r--ext/js/dom/popup-menu.js206
-rw-r--r--ext/js/dom/selector-observer.js255
-rw-r--r--ext/js/dom/window-scroll.js110
8 files changed, 1666 insertions, 0 deletions
diff --git a/ext/js/dom/document-focus-controller.js b/ext/js/dom/document-focus-controller.js
new file mode 100644
index 00000000..649b5abe
--- /dev/null
+++ b/ext/js/dom/document-focus-controller.js
@@ -0,0 +1,110 @@
+/*
+ * Copyright (C) 2020-2021 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/>.
+ */
+
+/**
+ * This class is used to control the document focus when a non-body element contains the main scrollbar.
+ * Web browsers will not automatically focus a custom element with the scrollbar on load, which results in
+ * keyboard shortcuts (e.g. arrow keys) not controlling page scroll. Instead, this class will manually
+ * focus a dummy element inside the main content, which gives keyboard scroll focus to that element.
+ */
+class DocumentFocusController {
+ constructor() {
+ this._contentScrollFocusElement = document.querySelector('#content-scroll-focus');
+ }
+
+ prepare() {
+ window.addEventListener('focus', this._onWindowFocus.bind(this), false);
+ this._updateFocusedElement(false);
+ }
+
+ blurElement(element) {
+ if (document.activeElement !== element) { return; }
+ element.blur();
+ this._updateFocusedElement(false);
+ }
+
+ // Private
+
+ _onWindowFocus() {
+ this._updateFocusedElement(false);
+ }
+
+ _updateFocusedElement(force) {
+ const target = this._contentScrollFocusElement;
+ if (target === null) { return; }
+
+ const {activeElement} = document;
+ if (
+ force ||
+ activeElement === null ||
+ activeElement === document.documentElement ||
+ activeElement === document.body
+ ) {
+ // Get selection
+ const selection = window.getSelection();
+ const selectionRanges1 = this._getSelectionRanges(selection);
+
+ // Note: This function will cause any selected text to be deselected on Firefox.
+ target.focus({preventScroll: true});
+
+ // Restore selection
+ const selectionRanges2 = this._getSelectionRanges(selection);
+ if (!this._areRangesSame(selectionRanges1, selectionRanges2)) {
+ this._setSelectionRanges(selection, selectionRanges1);
+ }
+ }
+ }
+
+ _getSelectionRanges(selection) {
+ const ranges = [];
+ for (let i = 0, ii = selection.rangeCount; i < ii; ++i) {
+ ranges.push(selection.getRangeAt(i));
+ }
+ return ranges;
+ }
+
+ _setSelectionRanges(selection, ranges) {
+ selection.removeAllRanges();
+ for (const range of ranges) {
+ selection.addRange(range);
+ }
+ }
+
+ _areRangesSame(ranges1, ranges2) {
+ const ii = ranges1.length;
+ if (ii !== ranges2.length) {
+ return false;
+ }
+
+ for (let i = 0; i < ii; ++i) {
+ const range1 = ranges1[i];
+ const range2 = ranges2[i];
+ try {
+ if (
+ range1.compareBoundaryPoints(Range.START_TO_START, range2) !== 0 ||
+ range1.compareBoundaryPoints(Range.END_TO_END, range2) !== 0
+ ) {
+ return false;
+ }
+ } catch (e) {
+ return false;
+ }
+ }
+
+ return true;
+ }
+}
diff --git a/ext/js/dom/document-util.js b/ext/js/dom/document-util.js
new file mode 100644
index 00000000..513a0c05
--- /dev/null
+++ b/ext/js/dom/document-util.js
@@ -0,0 +1,570 @@
+/*
+ * Copyright (C) 2016-2021 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
+ * DOMTextScanner
+ * TextSourceElement
+ * TextSourceRange
+ */
+
+class DocumentUtil {
+ constructor() {
+ this._transparentColorPattern = /rgba\s*\([^)]*,\s*0(?:\.0+)?\s*\)/;
+ }
+
+ getRangeFromPoint(x, y, deepContentScan) {
+ const elements = this._getElementsFromPoint(x, y, deepContentScan);
+ let imposter = null;
+ let imposterContainer = null;
+ let imposterSourceElement = null;
+ if (elements.length > 0) {
+ const element = elements[0];
+ switch (element.nodeName.toUpperCase()) {
+ case 'IMG':
+ case 'BUTTON':
+ return new TextSourceElement(element);
+ case 'INPUT':
+ imposterSourceElement = element;
+ [imposter, imposterContainer] = this._createImposter(element, false);
+ break;
+ case 'TEXTAREA':
+ imposterSourceElement = element;
+ [imposter, imposterContainer] = this._createImposter(element, true);
+ break;
+ }
+ }
+
+ const range = this._caretRangeFromPointExt(x, y, deepContentScan ? elements : []);
+ if (range !== null) {
+ if (imposter !== null) {
+ this._setImposterStyle(imposterContainer.style, 'z-index', '-2147483646');
+ this._setImposterStyle(imposter.style, 'pointer-events', 'none');
+ }
+ return new TextSourceRange(range, '', imposterContainer, imposterSourceElement);
+ } else {
+ if (imposterContainer !== null) {
+ imposterContainer.parentNode.removeChild(imposterContainer);
+ }
+ return null;
+ }
+ }
+
+ /**
+ * Extract a sentence from a document.
+ * @param source The text source object, either `TextSourceRange` or `TextSourceElement`.
+ * @param layoutAwareScan Whether or not layout-aware scan mode should be used.
+ * @param extent The length of the sentence to extract.
+ * @param terminatorMap A mapping of characters that terminate a sentence.
+ * Format:
+ * ```js
+ * new Map([ [character: string, [includeCharacterAtStart: boolean, includeCharacterAtEnd: boolean]], ... ])
+ * ```
+ * @param forwardQuoteMap A mapping of quote characters that delimit a sentence.
+ * Format:
+ * ```js
+ * new Map([ [character: string, [otherCharacter: string, includeCharacterAtStart: boolean]], ... ])
+ * ```
+ * @param backwardQuoteMap A mapping of quote characters that delimit a sentence,
+ * which is the inverse of forwardQuoteMap.
+ * Format:
+ * ```js
+ * new Map([ [character: string, [otherCharacter: string, includeCharacterAtEnd: boolean]], ... ])
+ * ```
+ * @returns The sentence and the offset to the original source: `{sentence: string, offset: integer}`.
+ */
+ extractSentence(source, layoutAwareScan, extent, terminatorMap, forwardQuoteMap, backwardQuoteMap) {
+ // Scan text
+ source = source.clone();
+ const startLength = source.setStartOffset(extent, layoutAwareScan);
+ const endLength = source.setEndOffset(extent * 2 - startLength, layoutAwareScan, true);
+ const text = source.text();
+ const textLength = text.length;
+ const textEndAnchor = textLength - endLength;
+ let pos1 = startLength;
+ let pos2 = textEndAnchor;
+
+ // Move backward
+ let quoteStack = [];
+ for (; pos1 > 0; --pos1) {
+ const c = text[pos1 - 1];
+ if (c === '\n') { break; }
+
+ if (quoteStack.length === 0) {
+ const terminatorInfo = terminatorMap.get(c);
+ if (typeof terminatorInfo !== 'undefined') {
+ if (terminatorInfo[0]) { --pos1; }
+ break;
+ }
+ }
+
+ let quoteInfo = forwardQuoteMap.get(c);
+ if (typeof quoteInfo !== 'undefined') {
+ if (quoteStack.length === 0) {
+ if (quoteInfo[1]) { --pos1; }
+ break;
+ } else if (quoteStack[0] === c) {
+ quoteStack.pop();
+ continue;
+ }
+ }
+
+ quoteInfo = backwardQuoteMap.get(c);
+ if (typeof quoteInfo !== 'undefined') {
+ quoteStack.unshift(quoteInfo[0]);
+ }
+ }
+
+ // Move forward
+ quoteStack = [];
+ for (; pos2 < textLength; ++pos2) {
+ const c = text[pos2];
+ if (c === '\n') { break; }
+
+ if (quoteStack.length === 0) {
+ const terminatorInfo = terminatorMap.get(c);
+ if (typeof terminatorInfo !== 'undefined') {
+ if (terminatorInfo[1]) { ++pos2; }
+ break;
+ }
+ }
+
+ let quoteInfo = backwardQuoteMap.get(c);
+ if (typeof quoteInfo !== 'undefined') {
+ if (quoteStack.length === 0) {
+ if (quoteInfo[1]) { ++pos2; }
+ break;
+ } else if (quoteStack[0] === c) {
+ quoteStack.pop();
+ continue;
+ }
+ }
+
+ quoteInfo = forwardQuoteMap.get(c);
+ if (typeof quoteInfo !== 'undefined') {
+ quoteStack.unshift(quoteInfo[0]);
+ }
+ }
+
+ // Trim whitespace
+ for (; pos1 < startLength && this._isWhitespace(text[pos1]); ++pos1) { /* NOP */ }
+ for (; pos2 > textEndAnchor && this._isWhitespace(text[pos2 - 1]); --pos2) { /* NOP */ }
+
+ // Result
+ return {
+ text: text.substring(pos1, pos2),
+ offset: startLength - pos1
+ };
+ }
+
+ static isPointInRect(x, y, rect) {
+ return (
+ x >= rect.left && x < rect.right &&
+ y >= rect.top && y < rect.bottom
+ );
+ }
+
+ static isPointInAnyRect(x, y, rects) {
+ for (const rect of rects) {
+ if (this.isPointInRect(x, y, rect)) {
+ return true;
+ }
+ }
+ return false;
+ }
+
+ static isPointInSelection(x, y, selection) {
+ for (let i = 0; i < selection.rangeCount; ++i) {
+ const range = selection.getRangeAt(i);
+ if (this.isPointInAnyRect(x, y, range.getClientRects())) {
+ return true;
+ }
+ }
+ return false;
+ }
+
+ static isMouseButtonPressed(mouseEvent, button) {
+ const mouseEventButton = mouseEvent.button;
+ switch (button) {
+ case 'primary': return mouseEventButton === 0;
+ case 'secondary': return mouseEventButton === 2;
+ case 'auxiliary': return mouseEventButton === 1;
+ default: return false;
+ }
+ }
+
+ static getActiveModifiers(event) {
+ const modifiers = [];
+ if (event.altKey) { modifiers.push('alt'); }
+ if (event.ctrlKey) { modifiers.push('ctrl'); }
+ if (event.metaKey) { modifiers.push('meta'); }
+ if (event.shiftKey) { modifiers.push('shift'); }
+ return modifiers;
+ }
+
+ static getActiveModifiersAndButtons(event) {
+ const modifiers = this.getActiveModifiers(event);
+ this._getActiveButtons(event, modifiers);
+ return modifiers;
+ }
+
+ static getActiveButtons(event) {
+ const buttons = [];
+ this._getActiveButtons(event, buttons);
+ return buttons;
+ }
+
+ static addFullscreenChangeEventListener(onFullscreenChanged, eventListenerCollection=null) {
+ const target = document;
+ const options = false;
+ const fullscreenEventNames = [
+ 'fullscreenchange',
+ 'MSFullscreenChange',
+ 'mozfullscreenchange',
+ 'webkitfullscreenchange'
+ ];
+ for (const eventName of fullscreenEventNames) {
+ if (eventListenerCollection === null) {
+ target.addEventListener(eventName, onFullscreenChanged, options);
+ } else {
+ eventListenerCollection.addEventListener(target, eventName, onFullscreenChanged, options);
+ }
+ }
+ }
+
+ static getFullscreenElement() {
+ return (
+ document.fullscreenElement ||
+ document.msFullscreenElement ||
+ document.mozFullScreenElement ||
+ document.webkitFullscreenElement ||
+ null
+ );
+ }
+
+ static getNodesInRange(range) {
+ const end = range.endContainer;
+ const nodes = [];
+ for (let node = range.startContainer; node !== null; node = this.getNextNode(node)) {
+ nodes.push(node);
+ if (node === end) { break; }
+ }
+ return nodes;
+ }
+
+ static getNextNode(node) {
+ let next = node.firstChild;
+ if (next === null) {
+ while (true) {
+ next = node.nextSibling;
+ if (next !== null) { break; }
+
+ next = node.parentNode;
+ if (next === null) { break; }
+
+ node = next;
+ }
+ }
+ return next;
+ }
+
+ static anyNodeMatchesSelector(nodes, selector) {
+ const ELEMENT_NODE = Node.ELEMENT_NODE;
+ for (let node of nodes) {
+ for (; node !== null; node = node.parentNode) {
+ if (node.nodeType !== ELEMENT_NODE) { continue; }
+ if (node.matches(selector)) { return true; }
+ break;
+ }
+ }
+ return false;
+ }
+
+ static everyNodeMatchesSelector(nodes, selector) {
+ const ELEMENT_NODE = Node.ELEMENT_NODE;
+ for (let node of nodes) {
+ while (true) {
+ if (node === null) { return false; }
+ if (node.nodeType === ELEMENT_NODE && node.matches(selector)) { break; }
+ node = node.parentNode;
+ }
+ }
+ return true;
+ }
+
+ static isMetaKeySupported(os, browser) {
+ return !(browser === 'firefox' || browser === 'firefox-mobile') || os === 'mac';
+ }
+
+ static _getActiveButtons(event, array) {
+ let {buttons} = event;
+ if (typeof buttons === 'number' && buttons > 0) {
+ for (let i = 0; i < 6; ++i) {
+ const buttonFlag = (1 << i);
+ if ((buttons & buttonFlag) !== 0) {
+ array.push(`mouse${i}`);
+ buttons &= ~buttonFlag;
+ if (buttons === 0) { break; }
+ }
+ }
+ }
+ }
+
+ // Private
+
+ _setImposterStyle(style, propertyName, value) {
+ style.setProperty(propertyName, value, 'important');
+ }
+
+ _createImposter(element, isTextarea) {
+ const body = document.body;
+ if (body === null) { return [null, null]; }
+
+ const elementStyle = window.getComputedStyle(element);
+ const elementRect = element.getBoundingClientRect();
+ const documentRect = document.documentElement.getBoundingClientRect();
+ let left = elementRect.left - documentRect.left;
+ let top = elementRect.top - documentRect.top;
+
+ // Container
+ const container = document.createElement('div');
+ const containerStyle = container.style;
+ this._setImposterStyle(containerStyle, 'all', 'initial');
+ this._setImposterStyle(containerStyle, 'position', 'absolute');
+ this._setImposterStyle(containerStyle, 'left', '0');
+ this._setImposterStyle(containerStyle, 'top', '0');
+ this._setImposterStyle(containerStyle, 'width', `${documentRect.width}px`);
+ this._setImposterStyle(containerStyle, 'height', `${documentRect.height}px`);
+ this._setImposterStyle(containerStyle, 'overflow', 'hidden');
+ this._setImposterStyle(containerStyle, 'opacity', '0');
+ this._setImposterStyle(containerStyle, 'pointer-events', 'none');
+ this._setImposterStyle(containerStyle, 'z-index', '2147483646');
+
+ // Imposter
+ const imposter = document.createElement('div');
+ const imposterStyle = imposter.style;
+
+ let value = element.value;
+ if (value.endsWith('\n')) { value += '\n'; }
+ imposter.textContent = value;
+
+ for (let i = 0, ii = elementStyle.length; i < ii; ++i) {
+ const property = elementStyle[i];
+ this._setImposterStyle(imposterStyle, property, elementStyle.getPropertyValue(property));
+ }
+ this._setImposterStyle(imposterStyle, 'position', 'absolute');
+ this._setImposterStyle(imposterStyle, 'top', `${top}px`);
+ this._setImposterStyle(imposterStyle, 'left', `${left}px`);
+ this._setImposterStyle(imposterStyle, 'margin', '0');
+ this._setImposterStyle(imposterStyle, 'pointer-events', 'auto');
+
+ if (isTextarea) {
+ if (elementStyle.overflow === 'visible') {
+ this._setImposterStyle(imposterStyle, 'overflow', 'auto');
+ }
+ } else {
+ this._setImposterStyle(imposterStyle, 'overflow', 'hidden');
+ this._setImposterStyle(imposterStyle, 'white-space', 'nowrap');
+ this._setImposterStyle(imposterStyle, 'line-height', elementStyle.height);
+ }
+
+ container.appendChild(imposter);
+ body.appendChild(container);
+
+ // Adjust size
+ const imposterRect = imposter.getBoundingClientRect();
+ if (imposterRect.width !== elementRect.width || imposterRect.height !== elementRect.height) {
+ const width = parseFloat(elementStyle.width) + (elementRect.width - imposterRect.width);
+ const height = parseFloat(elementStyle.height) + (elementRect.height - imposterRect.height);
+ this._setImposterStyle(imposterStyle, 'width', `${width}px`);
+ this._setImposterStyle(imposterStyle, 'height', `${height}px`);
+ }
+ if (imposterRect.x !== elementRect.x || imposterRect.y !== elementRect.y) {
+ left += (elementRect.left - imposterRect.left);
+ top += (elementRect.top - imposterRect.top);
+ this._setImposterStyle(imposterStyle, 'left', `${left}px`);
+ this._setImposterStyle(imposterStyle, 'top', `${top}px`);
+ }
+
+ imposter.scrollTop = element.scrollTop;
+ imposter.scrollLeft = element.scrollLeft;
+
+ return [imposter, container];
+ }
+
+ _getElementsFromPoint(x, y, all) {
+ if (all) {
+ // document.elementsFromPoint can return duplicates which must be removed.
+ const elements = document.elementsFromPoint(x, y);
+ return elements.filter((e, i) => elements.indexOf(e) === i);
+ }
+
+ const e = document.elementFromPoint(x, y);
+ return e !== null ? [e] : [];
+ }
+
+ _isPointInRange(x, y, range) {
+ // Require a text node to start
+ if (range.startContainer.nodeType !== Node.TEXT_NODE) {
+ return false;
+ }
+
+ // Scan forward
+ const nodePre = range.endContainer;
+ const offsetPre = range.endOffset;
+ try {
+ const {node, offset, content} = new DOMTextScanner(range.endContainer, range.endOffset, true, false).seek(1);
+ range.setEnd(node, offset);
+
+ if (!this._isWhitespace(content) && DocumentUtil.isPointInAnyRect(x, y, range.getClientRects())) {
+ return true;
+ }
+ } finally {
+ range.setEnd(nodePre, offsetPre);
+ }
+
+ // Scan backward
+ const {node, offset, content} = new DOMTextScanner(range.startContainer, range.startOffset, true, false).seek(-1);
+ range.setStart(node, offset);
+
+ if (!this._isWhitespace(content) && DocumentUtil.isPointInAnyRect(x, y, range.getClientRects())) {
+ // This purposefully leaves the starting offset as modified and sets the range length to 0.
+ range.setEnd(node, offset);
+ return true;
+ }
+
+ // No match
+ return false;
+ }
+
+ _isWhitespace(string) {
+ return string.trim().length === 0;
+ }
+
+ _caretRangeFromPoint(x, y) {
+ if (typeof document.caretRangeFromPoint === 'function') {
+ // Chrome, Edge
+ return document.caretRangeFromPoint(x, y);
+ }
+
+ if (typeof document.caretPositionFromPoint === 'function') {
+ // Firefox
+ return this._caretPositionFromPoint(x, y);
+ }
+
+ // No support
+ return null;
+ }
+
+ _caretPositionFromPoint(x, y) {
+ const position = document.caretPositionFromPoint(x, y);
+ if (position === null) {
+ return null;
+ }
+ const node = position.offsetNode;
+ if (node === null) {
+ return null;
+ }
+
+ const range = document.createRange();
+ const offset = (node.nodeType === Node.TEXT_NODE ? position.offset : 0);
+ try {
+ range.setStart(node, offset);
+ range.setEnd(node, offset);
+ } catch (e) {
+ // Firefox throws new DOMException("The operation is insecure.")
+ // when trying to select a node from within a ShadowRoot.
+ return null;
+ }
+ return range;
+ }
+
+ _caretRangeFromPointExt(x, y, elements) {
+ const modifications = [];
+ try {
+ let i = 0;
+ let startContinerPre = null;
+ while (true) {
+ const range = this._caretRangeFromPoint(x, y);
+ if (range === null) {
+ return null;
+ }
+
+ const startContainer = range.startContainer;
+ if (startContinerPre !== startContainer) {
+ if (this._isPointInRange(x, y, range)) {
+ return range;
+ }
+ startContinerPre = startContainer;
+ }
+
+ i = this._disableTransparentElement(elements, i, modifications);
+ if (i < 0) {
+ return null;
+ }
+ }
+ } finally {
+ if (modifications.length > 0) {
+ this._restoreElementStyleModifications(modifications);
+ }
+ }
+ }
+
+ _disableTransparentElement(elements, i, modifications) {
+ while (true) {
+ if (i >= elements.length) {
+ return -1;
+ }
+
+ const element = elements[i++];
+ if (this._isElementTransparent(element)) {
+ const style = element.hasAttribute('style') ? element.getAttribute('style') : null;
+ modifications.push({element, style});
+ element.style.setProperty('pointer-events', 'none', 'important');
+ return i;
+ }
+ }
+ }
+
+ _restoreElementStyleModifications(modifications) {
+ for (const {element, style} of modifications) {
+ if (style === null) {
+ element.removeAttribute('style');
+ } else {
+ element.setAttribute('style', style);
+ }
+ }
+ }
+
+ _isElementTransparent(element) {
+ if (
+ element === document.body ||
+ element === document.documentElement
+ ) {
+ return false;
+ }
+ const style = window.getComputedStyle(element);
+ return (
+ parseFloat(style.opacity) <= 0 ||
+ style.visibility === 'hidden' ||
+ (style.backgroundImage === 'none' && this._isColorTransparent(style.backgroundColor))
+ );
+ }
+
+ _isColorTransparent(cssColor) {
+ return this._transparentColorPattern.test(cssColor);
+ }
+}
diff --git a/ext/js/dom/dom-data-binder.js b/ext/js/dom/dom-data-binder.js
new file mode 100644
index 00000000..292b2f67
--- /dev/null
+++ b/ext/js/dom/dom-data-binder.js
@@ -0,0 +1,234 @@
+/*
+ * Copyright (C) 2020-2021 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
+ * SelectorObserver
+ * TaskAccumulator
+ */
+
+class DOMDataBinder {
+ constructor({selector, ignoreSelectors=[], createElementMetadata, compareElementMetadata, getValues, setValues, onError=null}) {
+ this._selector = selector;
+ this._ignoreSelectors = ignoreSelectors;
+ this._createElementMetadata = createElementMetadata;
+ this._compareElementMetadata = compareElementMetadata;
+ this._getValues = getValues;
+ this._setValues = setValues;
+ this._onError = onError;
+ this._updateTasks = new TaskAccumulator(this._onBulkUpdate.bind(this));
+ this._assignTasks = new TaskAccumulator(this._onBulkAssign.bind(this));
+ this._selectorObserver = new SelectorObserver({
+ selector,
+ ignoreSelector: (ignoreSelectors.length > 0 ? ignoreSelectors.join(',') : null),
+ onAdded: this._createObserver.bind(this),
+ onRemoved: this._removeObserver.bind(this),
+ onChildrenUpdated: this._onObserverChildrenUpdated.bind(this),
+ isStale: this._isObserverStale.bind(this)
+ });
+ }
+
+ observe(element) {
+ this._selectorObserver.observe(element, true);
+ }
+
+ disconnect() {
+ this._selectorObserver.disconnect();
+ }
+
+ async refresh() {
+ await this._updateTasks.enqueue(null, {all: true});
+ }
+
+ // Private
+
+ async _onBulkUpdate(tasks) {
+ let all = false;
+ const targets = [];
+ for (const [observer, task] of tasks) {
+ if (observer === null) {
+ if (task.data.all) {
+ all = true;
+ break;
+ }
+ } else {
+ targets.push([observer, task]);
+ }
+ }
+ if (all) {
+ targets.length = 0;
+ for (const observer of this._selectorObserver.datas()) {
+ targets.push([observer, null]);
+ }
+ }
+
+ const args = targets.map(([observer]) => ({
+ element: observer.element,
+ metadata: observer.metadata
+ }));
+ const responses = await this._getValues(args);
+ this._applyValues(targets, responses, true);
+ }
+
+ async _onBulkAssign(tasks) {
+ const targets = tasks;
+ const args = targets.map(([observer, task]) => ({
+ element: observer.element,
+ metadata: observer.metadata,
+ value: task.data.value
+ }));
+ const responses = await this._setValues(args);
+ this._applyValues(targets, responses, false);
+ }
+
+ _onElementChange(observer) {
+ const value = this._getElementValue(observer.element);
+ observer.value = value;
+ observer.hasValue = true;
+ this._assignTasks.enqueue(observer, {value});
+ }
+
+ _applyValues(targets, response, ignoreStale) {
+ if (!Array.isArray(response)) { return; }
+
+ for (let i = 0, ii = targets.length; i < ii; ++i) {
+ const [observer, task] = targets[i];
+ const {error, result} = response[i];
+ const stale = (task !== null && task.stale);
+
+ if (error) {
+ if (typeof this._onError === 'function') {
+ this._onError(error, stale, observer.element, observer.metadata);
+ }
+ continue;
+ }
+
+ if (stale && !ignoreStale) { continue; }
+
+ observer.value = result;
+ observer.hasValue = true;
+ this._setElementValue(observer.element, result);
+ }
+ }
+
+ _createObserver(element) {
+ const metadata = this._createElementMetadata(element);
+ const nodeName = element.nodeName.toUpperCase();
+ const observer = {
+ element,
+ type: (nodeName === 'INPUT' ? element.type : null),
+ value: null,
+ hasValue: false,
+ onChange: null,
+ metadata
+ };
+ observer.onChange = this._onElementChange.bind(this, observer);
+
+ element.addEventListener('change', observer.onChange, false);
+
+ this._updateTasks.enqueue(observer);
+
+ return observer;
+ }
+
+ _removeObserver(element, observer) {
+ element.removeEventListener('change', observer.onChange, false);
+ observer.onChange = null;
+ }
+
+ _onObserverChildrenUpdated(element, observer) {
+ if (observer.hasValue) {
+ this._setElementValue(element, observer.value);
+ }
+ }
+
+ _isObserverStale(element, observer) {
+ const {type, metadata} = observer;
+ const nodeName = element.nodeName.toUpperCase();
+ return !(
+ type === (nodeName === 'INPUT' ? element.type : null) &&
+ this._compareElementMetadata(metadata, this._createElementMetadata(element))
+ );
+ }
+
+ _setElementValue(element, value) {
+ switch (element.nodeName.toUpperCase()) {
+ case 'INPUT':
+ switch (element.type) {
+ case 'checkbox':
+ element.checked = value;
+ break;
+ case 'text':
+ case 'number':
+ element.value = value;
+ break;
+ }
+ break;
+ case 'TEXTAREA':
+ case 'SELECT':
+ element.value = value;
+ break;
+ }
+
+ const event = new CustomEvent('settingChanged', {detail: {value}});
+ element.dispatchEvent(event);
+ }
+
+ _getElementValue(element) {
+ switch (element.nodeName.toUpperCase()) {
+ case 'INPUT':
+ switch (element.type) {
+ case 'checkbox':
+ return !!element.checked;
+ case 'text':
+ return `${element.value}`;
+ case 'number':
+ return DOMDataBinder.convertToNumber(element.value, element);
+ }
+ break;
+ case 'TEXTAREA':
+ case 'SELECT':
+ return element.value;
+ }
+ return null;
+ }
+
+ // Utilities
+
+ static convertToNumber(value, constraints) {
+ value = parseFloat(value);
+ if (!Number.isFinite(value)) { return 0; }
+
+ let {min, max, step} = constraints;
+ min = DOMDataBinder.convertToNumberOrNull(min);
+ max = DOMDataBinder.convertToNumberOrNull(max);
+ step = DOMDataBinder.convertToNumberOrNull(step);
+ if (typeof min === 'number') { value = Math.max(value, min); }
+ if (typeof max === 'number') { value = Math.min(value, max); }
+ if (typeof step === 'number' && step !== 0) { value = Math.round(value / step) * step; }
+ return value;
+ }
+
+ static convertToNumberOrNull(value) {
+ if (typeof value !== 'number') {
+ if (typeof value !== 'string' || value.length === 0) {
+ return null;
+ }
+ value = parseFloat(value);
+ }
+ return !Number.isNaN(value) ? value : null;
+ }
+}
diff --git a/ext/js/dom/html-template-collection.js b/ext/js/dom/html-template-collection.js
new file mode 100644
index 00000000..52d5f3b0
--- /dev/null
+++ b/ext/js/dom/html-template-collection.js
@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2020-2021 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 <http://www.gnu.org/licenses/>.
+ */
+
+class HtmlTemplateCollection {
+ constructor(source) {
+ this._templates = new Map();
+
+ const sourceNode = (
+ typeof source === 'string' ?
+ new DOMParser().parseFromString(source, 'text/html') :
+ source
+ );
+
+ const pattern = /^([\w\W]+)-template$/;
+ for (const template of sourceNode.querySelectorAll('template')) {
+ const match = pattern.exec(template.id);
+ if (match === null) { continue; }
+ this._prepareTemplate(template);
+ this._templates.set(match[1], template);
+ }
+ }
+
+ instantiate(name) {
+ const template = this._templates.get(name);
+ return document.importNode(template.content.firstChild, true);
+ }
+
+ instantiateFragment(name) {
+ const template = this._templates.get(name);
+ return document.importNode(template.content, true);
+ }
+
+ getAllTemplates() {
+ return this._templates.values();
+ }
+
+ // Private
+
+ _prepareTemplate(template) {
+ if (template.dataset.removeWhitespaceText === 'true') {
+ this._removeWhitespaceText(template);
+ }
+ }
+
+ _removeWhitespaceText(template) {
+ const {content} = template;
+ const {TEXT_NODE} = Node;
+ const iterator = document.createNodeIterator(content, NodeFilter.SHOW_TEXT);
+ const removeNodes = [];
+ while (true) {
+ const node = iterator.nextNode();
+ if (node === null) { break; }
+ if (node.nodeType === TEXT_NODE && node.nodeValue.trim().length === 0) {
+ removeNodes.push(node);
+ }
+ }
+ for (const node of removeNodes) {
+ const {parentNode} = node;
+ if (parentNode !== null) {
+ parentNode.removeChild(node);
+ }
+ }
+ }
+}
diff --git a/ext/js/dom/panel-element.js b/ext/js/dom/panel-element.js
new file mode 100644
index 00000000..1ef61d6f
--- /dev/null
+++ b/ext/js/dom/panel-element.js
@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2020-2021 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/>.
+ */
+
+class PanelElement extends EventDispatcher {
+ constructor({node, closingAnimationDuration}) {
+ super();
+ this._node = node;
+ this._closingAnimationDuration = closingAnimationDuration;
+ this._hiddenAnimatingClass = 'hidden-animating';
+ this._mutationObserver = null;
+ this._visible = false;
+ this._closeTimer = null;
+ }
+
+ get node() {
+ return this._node;
+ }
+
+ isVisible() {
+ return !this._node.hidden;
+ }
+
+ setVisible(value, animate=true) {
+ value = !!value;
+ if (this.isVisible() === value) { return; }
+
+ if (this._closeTimer !== null) {
+ clearTimeout(this._closeTimer);
+ this._completeClose(true);
+ }
+
+ const node = this._node;
+ const {classList} = node;
+ if (value) {
+ if (animate) { classList.add(this._hiddenAnimatingClass); }
+ getComputedStyle(node).getPropertyValue('display'); // Force update of CSS display property, allowing animation
+ classList.remove(this._hiddenAnimatingClass);
+ node.hidden = false;
+ node.focus();
+ } else {
+ if (animate) { classList.add(this._hiddenAnimatingClass); }
+ node.hidden = true;
+ if (animate) {
+ this._closeTimer = setTimeout(() => this._completeClose(false), this._closingAnimationDuration);
+ }
+ }
+ }
+
+ on(eventName, callback) {
+ if (eventName === 'visibilityChanged') {
+ if (this._mutationObserver === null) {
+ this._visible = this.isVisible();
+ this._mutationObserver = new MutationObserver(this._onMutation.bind(this));
+ this._mutationObserver.observe(this._node, {
+ attributes: true,
+ attributeFilter: ['hidden'],
+ attributeOldValue: true
+ });
+ }
+ }
+ return super.on(eventName, callback);
+ }
+
+ off(eventName, callback) {
+ const result = super.off(eventName, callback);
+ if (eventName === 'visibilityChanged' && !this.hasListeners(eventName)) {
+ if (this._mutationObserver !== null) {
+ this._mutationObserver.disconnect();
+ this._mutationObserver = null;
+ }
+ }
+ return result;
+ }
+
+ // Private
+
+ _onMutation() {
+ const visible = this.isVisible();
+ if (this._visible === visible) { return; }
+ this._visible = visible;
+ this.trigger('visibilityChanged', {visible});
+ }
+
+ _completeClose(reopening) {
+ this._closeTimer = null;
+ this._node.classList.remove(this._hiddenAnimatingClass);
+ this.trigger('closeCompleted', {reopening});
+ }
+}
diff --git a/ext/js/dom/popup-menu.js b/ext/js/dom/popup-menu.js
new file mode 100644
index 00000000..9ad4e260
--- /dev/null
+++ b/ext/js/dom/popup-menu.js
@@ -0,0 +1,206 @@
+/*
+ * Copyright (C) 2020-2021 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/>.
+ */
+
+class PopupMenu extends EventDispatcher {
+ constructor(sourceElement, containerNode) {
+ super();
+ this._sourceElement = sourceElement;
+ this._containerNode = containerNode;
+ this._node = containerNode.querySelector('.popup-menu');
+ this._bodyNode = containerNode.querySelector('.popup-menu-body');
+ this._isClosed = false;
+ this._eventListeners = new EventListenerCollection();
+ }
+
+ get sourceElement() {
+ return this._sourceElement;
+ }
+
+ get containerNode() {
+ return this._containerNode;
+ }
+
+ get node() {
+ return this._node;
+ }
+
+ get bodyNode() {
+ return this._bodyNode;
+ }
+
+ get isClosed() {
+ return this._isClosed;
+ }
+
+ prepare() {
+ const items = this._bodyNode.querySelectorAll('.popup-menu-item');
+ this._setPosition();
+ this._containerNode.focus();
+
+ this._eventListeners.addEventListener(window, 'resize', this._onWindowResize.bind(this), false);
+ this._eventListeners.addEventListener(this._containerNode, 'click', this._onMenuContainerClick.bind(this), false);
+
+ const onMenuItemClick = this._onMenuItemClick.bind(this);
+ for (const item of items) {
+ this._eventListeners.addEventListener(item, 'click', onMenuItemClick, false);
+ }
+
+ PopupMenu.openMenus.add(this);
+
+ this._sourceElement.dispatchEvent(new CustomEvent('menuOpen', {
+ bubbles: false,
+ cancelable: false,
+ detail: {menu: this}
+ }));
+ }
+
+ close(cancelable=true) {
+ return this._close(null, 'close', cancelable);
+ }
+
+ // Private
+
+ _onMenuContainerClick(e) {
+ if (e.currentTarget !== e.target) { return; }
+ e.stopPropagation();
+ e.preventDefault();
+ this._close(null, 'outside', true);
+ }
+
+ _onMenuItemClick(e) {
+ const item = e.currentTarget;
+ if (item.disabled) { return; }
+ e.stopPropagation();
+ e.preventDefault();
+ this._close(item, 'item', true);
+ }
+
+ _onWindowResize() {
+ this._close(null, 'resize', true);
+ }
+
+ _setPosition() {
+ // Get flags
+ let horizontal = 1;
+ let vertical = 1;
+ let horizontalCover = 1;
+ let verticalCover = 1;
+ const positionInfo = this._sourceElement.dataset.menuPosition;
+ if (typeof positionInfo === 'string') {
+ const positionInfoSet = new Set(positionInfo.split(' '));
+
+ if (positionInfoSet.has('left')) {
+ horizontal = -1;
+ } else if (positionInfoSet.has('right')) {
+ horizontal = 1;
+ } else if (positionInfoSet.has('h-center')) {
+ horizontal = 0;
+ }
+
+ if (positionInfoSet.has('above')) {
+ vertical = -1;
+ } else if (positionInfoSet.has('below')) {
+ vertical = 1;
+ } else if (positionInfoSet.has('v-center')) {
+ vertical = 0;
+ }
+
+ if (positionInfoSet.has('cover')) {
+ horizontalCover = 1;
+ verticalCover = 1;
+ } else if (positionInfoSet.has('no-cover')) {
+ horizontalCover = -1;
+ verticalCover = -1;
+ }
+
+ if (positionInfoSet.has('h-cover')) {
+ horizontalCover = 1;
+ } else if (positionInfoSet.has('no-h-cover')) {
+ horizontalCover = -1;
+ }
+
+ if (positionInfoSet.has('v-cover')) {
+ verticalCover = 1;
+ } else if (positionInfoSet.has('no-v-cover')) {
+ verticalCover = -1;
+ }
+ }
+
+ // Position
+ const menu = this._node;
+ const fullRect = this._containerNode.getBoundingClientRect();
+ const sourceRect = this._sourceElement.getBoundingClientRect();
+ const menuRect = menu.getBoundingClientRect();
+ let top = menuRect.top;
+ let bottom = menuRect.bottom;
+ if (verticalCover === 1) {
+ const bodyRect = this._bodyNode.getBoundingClientRect();
+ top = bodyRect.top;
+ bottom = bodyRect.bottom;
+ }
+
+ let x = (
+ sourceRect.left +
+ sourceRect.width * ((-horizontal * horizontalCover + 1) * 0.5) +
+ menuRect.width * ((-horizontal + 1) * -0.5)
+ );
+ let y = (
+ sourceRect.top +
+ (menuRect.top - top) +
+ sourceRect.height * ((-vertical * verticalCover + 1) * 0.5) +
+ (bottom - top) * ((-vertical + 1) * -0.5)
+ );
+
+ x = Math.max(0.0, Math.min(fullRect.width - menuRect.width, x));
+ y = Math.max(0.0, Math.min(fullRect.height - menuRect.height, y));
+
+ menu.style.left = `${x}px`;
+ menu.style.top = `${y}px`;
+ }
+
+ _close(item, cause, cancelable) {
+ if (this._isClosed) { return true; }
+ const action = (item !== null ? item.dataset.menuAction : null);
+
+ const detail = {
+ menu: this,
+ item,
+ action,
+ cause
+ };
+ const result = this._sourceElement.dispatchEvent(new CustomEvent('menuClose', {bubbles: false, cancelable, detail}));
+ if (cancelable && !result) { return false; }
+
+ PopupMenu.openMenus.delete(this);
+
+ this._isClosed = true;
+ this._eventListeners.removeAllEventListeners();
+ if (this._containerNode.parentNode !== null) {
+ this._containerNode.parentNode.removeChild(this._containerNode);
+ }
+
+ this.trigger('close', detail);
+ return true;
+ }
+}
+
+Object.defineProperty(PopupMenu, 'openMenus', {
+ configurable: false,
+ enumerable: true,
+ writable: false,
+ value: new Set()
+});
diff --git a/ext/js/dom/selector-observer.js b/ext/js/dom/selector-observer.js
new file mode 100644
index 00000000..2f3fa49e
--- /dev/null
+++ b/ext/js/dom/selector-observer.js
@@ -0,0 +1,255 @@
+/*
+ * Copyright (C) 2020-2021 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/>.
+ */
+
+/**
+ * Class which is used to observe elements matching a selector in specific element.
+ */
+class SelectorObserver {
+ /**
+ * Creates a new instance.
+ * @param selector A string CSS selector used to find elements.
+ * @param ignoreSelector A string CSS selector used to filter elements, or null for no filtering.
+ * @param onAdded A function which is invoked for each element that is added that matches the selector.
+ * The signature is (element) => data.
+ * @param onRemoved A function which is invoked for each element that is removed, or null.
+ * The signature is (element, data) => void.
+ * @param onChildrenUpdated A function which is invoked for each element which has its children updated, or null.
+ * The signature is (element, data) => void.
+ * @param isStale A function which checks if the data is stale for a given element, or null.
+ * If the element is stale, it will be removed and potentially re-added.
+ * The signature is (element, data) => bool.
+ */
+ constructor({selector, ignoreSelector=null, onAdded=null, onRemoved=null, onChildrenUpdated=null, isStale=null}) {
+ this._selector = selector;
+ this._ignoreSelector = ignoreSelector;
+ this._onAdded = onAdded;
+ this._onRemoved = onRemoved;
+ this._onChildrenUpdated = onChildrenUpdated;
+ this._isStale = isStale;
+ this._observingElement = null;
+ this._mutationObserver = new MutationObserver(this._onMutation.bind(this));
+ this._elementMap = new Map(); // Map([element => observer]...)
+ this._elementAncestorMap = new Map(); // Map([element => Set([observer]...)]...)
+ this._isObserving = false;
+ }
+
+ /**
+ * Returns whether or not an element is currently being observed.
+ * @returns True if an element is being observed, false otherwise.
+ */
+ get isObserving() {
+ return this._observingElement !== null;
+ }
+
+ /**
+ * Starts DOM mutation observing the target element.
+ * @param element The element to observe changes in.
+ * @param attributes A boolean for whether or not attribute changes should be observed.
+ * @throws An error if element is null.
+ * @throws An error if an element is already being observed.
+ */
+ observe(element, attributes=false) {
+ if (element === null) {
+ throw new Error('Invalid element');
+ }
+ if (this.isObserving) {
+ throw new Error('Instance is already observing an element');
+ }
+
+ this._observingElement = element;
+ this._mutationObserver.observe(element, {
+ attributes: !!attributes,
+ childList: true,
+ subtree: true
+ });
+
+ this._onMutation([{
+ type: 'childList',
+ target: element.parentNode,
+ addedNodes: [element],
+ removedNodes: []
+ }]);
+ }
+
+ /**
+ * Stops observing the target element.
+ */
+ disconnect() {
+ if (!this.isObserving) { return; }
+
+ this._mutationObserver.disconnect();
+ this._observingElement = null;
+
+ for (const observer of this._elementMap.values()) {
+ this._removeObserver(observer);
+ }
+ }
+
+ /**
+ * Returns an iterable list of [element, data] pairs.
+ * @yields A sequence of [element, data] pairs.
+ */
+ *entries() {
+ for (const [element, {data}] of this._elementMap) {
+ yield [element, data];
+ }
+ }
+
+ /**
+ * Returns an iterable list of data for every element.
+ * @yields A sequence of data values.
+ */
+ *datas() {
+ for (const {data} of this._elementMap.values()) {
+ yield data;
+ }
+ }
+
+ // Private
+
+ _onMutation(mutationList) {
+ for (const mutation of mutationList) {
+ switch (mutation.type) {
+ case 'childList':
+ this._onChildListMutation(mutation);
+ break;
+ case 'attributes':
+ this._onAttributeMutation(mutation);
+ break;
+ }
+ }
+ }
+
+ _onChildListMutation({addedNodes, removedNodes, target}) {
+ const selector = this._selector;
+ const ELEMENT_NODE = Node.ELEMENT_NODE;
+
+ for (const node of removedNodes) {
+ const observers = this._elementAncestorMap.get(node);
+ if (typeof observers === 'undefined') { continue; }
+ for (const observer of observers) {
+ this._removeObserver(observer);
+ }
+ }
+
+ for (const node of addedNodes) {
+ if (node.nodeType !== ELEMENT_NODE) { continue; }
+ if (node.matches(selector)) {
+ this._createObserver(node);
+ }
+ for (const childNode of node.querySelectorAll(selector)) {
+ this._createObserver(childNode);
+ }
+ }
+
+ if (
+ this._onChildrenUpdated !== null &&
+ (addedNodes.length !== 0 || addedNodes.length !== 0)
+ ) {
+ for (let node = target; node !== null; node = node.parentNode) {
+ const observer = this._elementMap.get(node);
+ if (typeof observer !== 'undefined') {
+ this._onObserverChildrenUpdated(observer);
+ }
+ }
+ }
+ }
+
+ _onAttributeMutation({target}) {
+ const selector = this._selector;
+ const observers = this._elementAncestorMap.get(target);
+ if (typeof observers !== 'undefined') {
+ for (const observer of observers) {
+ const element = observer.element;
+ if (
+ !element.matches(selector) ||
+ this._shouldIgnoreElement(element) ||
+ this._isObserverStale(observer)
+ ) {
+ this._removeObserver(observer);
+ }
+ }
+ }
+
+ if (target.matches(selector)) {
+ this._createObserver(target);
+ }
+ }
+
+ _createObserver(element) {
+ if (this._elementMap.has(element) || this._shouldIgnoreElement(element) || this._onAdded === null) { return; }
+
+ const data = this._onAdded(element);
+ const ancestors = this._getAncestors(element);
+ const observer = {element, ancestors, data};
+
+ this._elementMap.set(element, observer);
+
+ for (const ancestor of ancestors) {
+ let observers = this._elementAncestorMap.get(ancestor);
+ if (typeof observers === 'undefined') {
+ observers = new Set();
+ this._elementAncestorMap.set(ancestor, observers);
+ }
+ observers.add(observer);
+ }
+ }
+
+ _removeObserver(observer) {
+ const {element, ancestors, data} = observer;
+
+ this._elementMap.delete(element);
+
+ for (const ancestor of ancestors) {
+ const observers = this._elementAncestorMap.get(ancestor);
+ if (typeof observers === 'undefined') { continue; }
+
+ observers.delete(observer);
+ if (observers.size === 0) {
+ this._elementAncestorMap.delete(ancestor);
+ }
+ }
+
+ if (this._onRemoved !== null) {
+ this._onRemoved(element, data);
+ }
+ }
+
+ _onObserverChildrenUpdated(observer) {
+ this._onChildrenUpdated(observer.element, observer.data);
+ }
+
+ _isObserverStale(observer) {
+ return (this._isStale !== null && this._isStale(observer.element, observer.data));
+ }
+
+ _shouldIgnoreElement(element) {
+ return (this._ignoreSelector !== null && element.matches(this._ignoreSelector));
+ }
+
+ _getAncestors(node) {
+ const root = this._observingElement;
+ const results = [];
+ while (true) {
+ results.push(node);
+ if (node === root) { break; }
+ node = node.parentNode;
+ if (node === null) { break; }
+ }
+ return results;
+ }
+}
diff --git a/ext/js/dom/window-scroll.js b/ext/js/dom/window-scroll.js
new file mode 100644
index 00000000..33577795
--- /dev/null
+++ b/ext/js/dom/window-scroll.js
@@ -0,0 +1,110 @@
+/*
+ * Copyright (C) 2019-2021 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/>.
+ */
+
+class WindowScroll {
+ constructor(node) {
+ this._node = node;
+ this._animationRequestId = null;
+ this._animationStartTime = 0;
+ this._animationStartX = 0;
+ this._animationStartY = 0;
+ this._animationEndTime = 0;
+ this._animationEndX = 0;
+ this._animationEndY = 0;
+ this._requestAnimationFrameCallback = this._onAnimationFrame.bind(this);
+ }
+
+ get x() {
+ return this._node !== null ? this._node.scrollLeft : window.scrollX || window.pageXOffset;
+ }
+
+ get y() {
+ return this._node !== null ? this._node.scrollTop : window.scrollY || window.pageYOffset;
+ }
+
+ toY(y) {
+ this.to(this.x, y);
+ }
+
+ toX(x) {
+ this.to(x, this.y);
+ }
+
+ to(x, y) {
+ this.stop();
+ this._scroll(x, y);
+ }
+
+ animate(x, y, time) {
+ this._animationStartX = this.x;
+ this._animationStartY = this.y;
+ this._animationStartTime = window.performance.now();
+ this._animationEndX = x;
+ this._animationEndY = y;
+ this._animationEndTime = this._animationStartTime + time;
+ this._animationRequestId = window.requestAnimationFrame(this._requestAnimationFrameCallback);
+ }
+
+ stop() {
+ if (this._animationRequestId === null) {
+ return;
+ }
+
+ window.cancelAnimationFrame(this._animationRequestId);
+ this._animationRequestId = null;
+ }
+
+ // Private
+
+ _onAnimationFrame(time) {
+ if (time >= this._animationEndTime) {
+ this._scroll(this._animationEndX, this._animationEndY);
+ this._animationRequestId = null;
+ return;
+ }
+
+ const t = this._easeInOutCubic((time - this._animationStartTime) / (this._animationEndTime - this._animationStartTime));
+ this._scroll(
+ this._lerp(this._animationStartX, this._animationEndX, t),
+ this._lerp(this._animationStartY, this._animationEndY, t)
+ );
+
+ this._animationRequestId = window.requestAnimationFrame(this._requestAnimationFrameCallback);
+ }
+
+ _easeInOutCubic(t) {
+ if (t < 0.5) {
+ return (4.0 * t * t * t);
+ } else {
+ t = 1.0 - t;
+ return 1.0 - (4.0 * t * t * t);
+ }
+ }
+
+ _lerp(start, end, percent) {
+ return (end - start) * percent + start;
+ }
+
+ _scroll(x, y) {
+ if (this._node !== null) {
+ this._node.scrollLeft = x;
+ this._node.scrollTop = y;
+ } else {
+ window.scroll(x, y);
+ }
+ }
+}