/* * Copyright (C) 2016-2022 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 * DocumentUtil * FrameClient * ThemeController * dynamicLoader */ /** * This class is the container which hosts the display of search results. */ class Popup extends EventDispatcher { /** * Information about how popup content should be shown, specifically related to the outer popup frame. * @typedef {object} ContentDetails * @property {?object} optionsContext The options context for the content to show. * @property {Rect[]} sourceRects The rectangles of the source content. * @property {'horizontal-tb' | 'vertical-rl' | 'vertical-lr' | 'sideways-rl' | 'sideways-lr'} writingMode The normalized CSS writing-mode value of the source content. */ /** * A rectangle representing a DOM region, similar to DOMRect. * @typedef {object} Rect * @property {number} left The left position of the rectangle. * @property {number} top The top position of the rectangle. * @property {number} right The right position of the rectangle. * @property {number} bottom The bottom position of the rectangle. */ /** * A rectangle representing a DOM region, similar to DOMRect but with a `valid` property. * @typedef {object} ValidRect * @property {number} left The left position of the rectangle. * @property {number} top The top position of the rectangle. * @property {number} right The right position of the rectangle. * @property {number} bottom The bottom position of the rectangle. * @property {boolean} valid Whether or not the rectangle is valid. */ /** * A rectangle representing a DOM region for placing the popup frame. * @typedef {object} SizeRect * @property {number} left The left position of the rectangle. * @property {number} top The top position of the rectangle. * @property {number} width The width of the rectangle. * @property {number} height The height of the rectangle. * @property {boolean} after Whether or not the rectangle is positioned to the right of the source rectangle. * @property {boolean} below Whether or not the rectangle is positioned below the source rectangle. */ /** * Creates a new instance. * @param {object} details The details used to construct the new instance. * @param {string} details.id The ID of the popup. * @param {number} details.depth The depth of the popup. * @param {number} details.frameId The ID of the host frame. * @param {boolean} details.childrenSupported Whether or not the popup is able to show child popups. */ constructor({ id, depth, frameId, childrenSupported }) { super(); this._id = id; this._depth = depth; this._frameId = frameId; this._childrenSupported = childrenSupported; this._parent = null; this._child = null; this._injectPromise = null; this._injectPromiseComplete = false; this._visible = new DynamicProperty(false); this._visibleValue = false; this._optionsContext = null; this._contentScale = 1.0; this._targetOrigin = chrome.runtime.getURL('/').replace(/\/$/, ''); this._optionsAssigned = false; this._initialWidth = 400; this._initialHeight = 250; this._horizontalOffset = 0; this._verticalOffset = 10; this._horizontalOffset2 = 10; this._verticalOffset2 = 0; this._verticalTextPosition = 'before'; this._horizontalTextPositionBelow = true; this._displayMode = 'default'; this._displayModeIsFullWidth = false; this._scaleRelativeToVisualViewport = true; this._useSecureFrameUrl = true; this._useShadowDom = true; this._customOuterCss = ''; this._frameSizeContentScale = null; this._frameClient = null; this._frame = document.createElement('iframe'); this._frame.className = 'yomichan-popup'; this._frame.style.width = '0'; this._frame.style.height = '0'; this._container = this._frame; this._shadow = null; this._themeController = new ThemeController(this._frame); this._fullscreenEventListeners = new EventListenerCollection(); } /** * The ID of the popup. * @type {string} */ get id() { return this._id; } /** * The parent of the popup. * @type {Popup} */ get parent() { return this._parent; } /** * Sets the parent popup. * @param {Popup} value The parent popup to assign. */ set parent(value) { this._parent = value; } /** * The child of the popup. * @type {Popup} */ get child() { return this._child; } /** * Sets the child popup. * @param {Popup} value The child popup to assign. */ set child(value) { this._child = value; } /** * The depth of the popup. * @type {numer} */ get depth() { return this._depth; } /** * Gets the content window of the frame, which can be `null` * depending on the current state of the frame. * @type {?Window} */ get frameContentWindow() { return this._frame.contentWindow; } /** * Gets the DOM node that contains the frame. * @type {Element} */ get container() { return this._container; } /** * Gets the ID of the frame. * @type {number} */ get frameId() { return this._frameId; } /** * Prepares the popup for use. */ prepare() { this._frame.addEventListener('mouseover', this._onFrameMouseOver.bind(this)); this._frame.addEventListener('mouseout', this._onFrameMouseOut.bind(this)); this._frame.addEventListener('mousedown', (e) => e.stopPropagation()); this._frame.addEventListener('scroll', (e) => e.stopPropagation()); this._frame.addEventListener('load', this._onFrameLoad.bind(this)); this._visible.on('change', this._onVisibleChange.bind(this)); yomichan.on('extensionUnloaded', this._onExtensionUnloaded.bind(this)); this._onVisibleChange({value: this.isVisibleSync()}); this._themeController.prepare(); } /** * Sets the options context for the popup. * @param {object} optionsContext The options context object. */ async setOptionsContext(optionsContext) { await this._setOptionsContext(optionsContext); await this._invokeSafe('Display.setOptionsContext', {optionsContext}); } /** * Hides the popup. * @param {boolean} changeFocus Whether or not the parent popup or host frame should be focused. */ hide(changeFocus) { if (!this.isVisibleSync()) { return; } this._setVisible(false); if (this._child !== null) { this._child.hide(false); } if (changeFocus) { this._focusParent(); } } /** * Returns whether or not the popup is currently visible. * @returns {Promise<boolean>} `true` if the popup is visible, `false` otherwise. */ async isVisible() { return this.isVisibleSync(); } /** * Force assigns the visibility of the popup. * @param {boolean} value Whether or not the popup should be visible. * @param {number} priority The priority of the override. * @returns {Promise<string?>} A token used which can be passed to `clearVisibleOverride`, * or null if the override wasn't assigned. */ async setVisibleOverride(value, priority) { return this._visible.setOverride(value, priority); } /** * Clears a visibility override that was generated by `setVisibleOverride`. * @param {string} token The token returned from `setVisibleOverride`. * @returns {Promise<boolean>} `true` if the override existed and was removed, `false` otherwise. */ async clearVisibleOverride(token) { return this._visible.clearOverride(token); } /** * Checks whether a point is contained within the popup's rect. * @param {number} x The x coordinate. * @param {number} y The y coordinate. * @returns {Promise<boolean>} `true` if the point is contained within the popup's rect, `false` otherwise. */ async containsPoint(x, y) { for (let popup = this; popup !== null && popup.isVisibleSync(); popup = popup.child) { const rect = popup.getFrameRect(); if (rect.valid && x >= rect.left && y >= rect.top && x < rect.right && y < rect.bottom) { return true; } } return false; } /** * Shows and updates the positioning and content of the popup. * @param {ContentDetails} details Settings for the outer popup. * @param {Display.ContentDetails} displayDetails The details parameter passed to `Display.setContent`. * @returns {Promise<void>} */ async showContent(details, displayDetails) { if (!this._optionsAssigned) { throw new Error('Options not assigned'); } const {optionsContext, sourceRects, writingMode} = details; if (optionsContext !== null) { await this._setOptionsContextIfDifferent(optionsContext); } await this._show(sourceRects, writingMode); if (displayDetails !== null) { this._invokeSafe('Display.setContent', {details: displayDetails}); } } /** * Sets the custom styles for the popup content. * @param {string} css The CSS rules. */ setCustomCss(css) { this._invokeSafe('Display.setCustomCss', {css}); } /** * Stops the audio auto-play timer, if one has started. */ clearAutoPlayTimer() { this._invokeSafe('Display.clearAutoPlayTimer'); } /** * Sets the scaling factor of the popup content. * @param {number} scale The scaling factor. */ setContentScale(scale) { this._contentScale = scale; this._frame.style.fontSize = `${scale}px`; this._invokeSafe('Display.setContentScale', {scale}); } /** * Returns whether or not the popup is currently visible, synchronously. * @returns {boolean} `true` if the popup is visible, `false` otherwise. */ isVisibleSync() { return this._visible.value; } /** * Updates the outer theme of the popup. * @returns {Promise<void>} */ async updateTheme() { this._themeController.updateTheme(); } /** * Sets the custom styles for the outer popup container. * @param {string} css The CSS rules. * @param {boolean} useWebExtensionApi Whether or not web extension APIs should be used to inject the rules. * When web extension APIs are used, a DOM node is not generated, making it harder to detect the changes. */ async setCustomOuterCss(css, useWebExtensionApi) { let parentNode = null; const inShadow = (this._shadow !== null); if (inShadow) { useWebExtensionApi = false; parentNode = this._shadow; } const node = await dynamicLoader.loadStyle('yomichan-popup-outer-user-stylesheet', 'code', css, useWebExtensionApi, parentNode); this.trigger('customOuterCssChanged', {node, useWebExtensionApi, inShadow}); } /** * Gets the rectangle of the DOM frame, synchronously. * @returns {ValidRect} The rect. * `valid` is `false` for `PopupProxy`, since the DOM node is hosted in a different frame. */ getFrameRect() { const {left, top, right, bottom} = this._getFrameBoundingClientRect(); return {left, top, right, bottom, valid: true}; } /** * Gets the size of the DOM frame. * @returns {Promise<{width: number, height: number, valid: boolean}>} The size and whether or not it is valid. */ async getFrameSize() { const {width, height} = this._getFrameBoundingClientRect(); return {width, height, valid: true}; } /** * Sets the size of the DOM frame. * @param {number} width The desired width of the popup. * @param {number} height The desired height of the popup. * @returns {Promise<boolean>} `true` if the size assignment was successful, `false` otherwise. */ async setFrameSize(width, height) { this._setFrameSize(width, height); return true; } // Private functions _onFrameMouseOver() { this.trigger('framePointerOver', {}); } _onFrameMouseOut() { this.trigger('framePointerOut', {}); } _inject() { let injectPromise = this._injectPromise; if (injectPromise === null) { injectPromise = this._injectInner1(); this._injectPromise = injectPromise; injectPromise.then( () => { if (injectPromise !== this._injectPromise) { return; } this._injectPromiseComplete = true; }, () => {} ); } return injectPromise; } async _injectInner1() { try { await this._injectInner2(); return true; } catch (e) { this._resetFrame(); if (e.source === this) { return false; } // Passive error throw e; } } async _injectInner2() { if (!this._optionsAssigned) { throw new Error('Options not initialized'); } const useSecurePopupFrameUrl = this._useSecureFrameUrl; await this._setUpContainer(this._useShadowDom); const setupFrame = (frame) => { frame.removeAttribute('src'); frame.removeAttribute('srcdoc'); this._observeFullscreen(true); this._onFullscreenChanged(); const {contentDocument} = frame; if (contentDocument === null) { // This can occur when running inside a sandboxed frame without "allow-same-origin" const error = new Error('Popup not supoprted in this context'); error.source = this; // Used to detect a passive error which should be ignored throw error; } const url = chrome.runtime.getURL('/popup.html'); if (useSecurePopupFrameUrl) { contentDocument.location.href = url; } else { frame.setAttribute('src', url); } }; const frameClient = new FrameClient(); this._frameClient = frameClient; await frameClient.connect(this._frame, this._targetOrigin, this._frameId, setupFrame); // Configure await this._invokeSafe('Display.configure', { depth: this._depth, parentPopupId: this._id, parentFrameId: this._frameId, childrenSupported: this._childrenSupported, scale: this._contentScale, optionsContext: this._optionsContext }); } _onFrameLoad() { if (!this._injectPromiseComplete) { return; } this._resetFrame(); } _resetFrame() { const parent = this._container.parentNode; if (parent !== null) { parent.removeChild(this._container); } this._frame.removeAttribute('src'); this._frame.removeAttribute('srcdoc'); this._frameClient = null; this._injectPromise = null; this._injectPromiseComplete = false; } async _setUpContainer(usePopupShadowDom) { if (usePopupShadowDom && typeof this._frame.attachShadow === 'function') { const container = document.createElement('div'); container.style.setProperty('all', 'initial', 'important'); const shadow = container.attachShadow({mode: 'closed', delegatesFocus: true}); shadow.appendChild(this._frame); this._container = container; this._shadow = shadow; } else { const frameParentNode = this._frame.parentNode; if (frameParentNode !== null) { frameParentNode.removeChild(this._frame); } this._container = this._frame; this._shadow = null; } await this._injectStyles(); } async _injectStyles() { try { await this._injectPopupOuterStylesheet(); } catch (e) { // NOP } try { await this.setCustomOuterCss(this._customOuterCss, true); } catch (e) { // NOP } } async _injectPopupOuterStylesheet() { let fileType = 'file'; let useWebExtensionApi = true; let parentNode = null; if (this._shadow !== null) { fileType = 'file-content'; useWebExtensionApi = false; parentNode = this._shadow; } await dynamicLoader.loadStyle('yomichan-popup-outer-stylesheet', fileType, '/css/popup-outer.css', useWebExtensionApi, parentNode); } _observeFullscreen(observe) { if (!observe) { this._fullscreenEventListeners.removeAllEventListeners(); return; } if (this._fullscreenEventListeners.size > 0) { // Already observing return; } DocumentUtil.addFullscreenChangeEventListener(this._onFullscreenChanged.bind(this), this._fullscreenEventListeners); } _onFullscreenChanged() { const parent = this._getFrameParentElement(); if (parent !== null && this._container.parentNode !== parent) { parent.appendChild(this._container); } } async _show(sourceRects, writingMode) { const injected = await this._inject(); if (!injected) { return; } const viewport = this._getViewport(this._scaleRelativeToVisualViewport); let {left, top, width, height, after, below} = this._getPosition(sourceRects, writingMode, viewport); if (this._displayModeIsFullWidth) { left = viewport.left; top = below ? viewport.bottom - height : viewport.top; width = viewport.right - viewport.left; } const frame = this._frame; frame.dataset.popupDisplayMode = this._displayMode; frame.dataset.after = `${after}`; frame.dataset.below = `${below}`; frame.style.left = `${left}px`; frame.style.top = `${top}px`; this._setFrameSize(width, height); this._setVisible(true); if (this._child !== null) { this._child.hide(true); } } _setFrameSize(width, height) { const {style} = this._frame; style.width = `${width}px`; style.height = `${height}px`; } _setVisible(visible) { this._visible.defaultValue = visible; } _onVisibleChange({value}) { if (this._visibleValue === value) { return; } this._visibleValue = value; this._frame.style.setProperty('visibility', value ? 'visible' : 'hidden', 'important'); this._invokeSafe('Display.visibilityChanged', {value}); } _focusParent() { if (this._parent !== null) { // Chrome doesn't like focusing iframe without contentWindow. const contentWindow = this._parent.frameContentWindow; if (contentWindow !== null) { contentWindow.focus(); } } else { // Firefox doesn't like focusing window without first blurring the iframe. // this._frame.contentWindow.blur() doesn't work on Firefox for some reason. this._frame.blur(); // This is needed for Chrome. window.focus(); } } async _invoke(action, params={}) { const contentWindow = this._frame.contentWindow; if (this._frameClient === null || !this._frameClient.isConnected() || contentWindow === null) { return; } const message = this._frameClient.createMessage({action, params}); return await yomichan.crossFrame.invoke(this._frameClient.frameId, 'popupMessage', message); } async _invokeSafe(action, params={}, defaultReturnValue) { try { return await this._invoke(action, params); } catch (e) { if (!yomichan.isExtensionUnloaded) { throw e; } return defaultReturnValue; } } _invokeWindow(action, params={}) { const contentWindow = this._frame.contentWindow; if (this._frameClient === null || !this._frameClient.isConnected() || contentWindow === null) { return; } const message = this._frameClient.createMessage({action, params}); contentWindow.postMessage(message, this._targetOrigin); } _onExtensionUnloaded() { this._invokeWindow('Display.extensionUnloaded'); } _getFrameParentElement() { let defaultParent = document.body; if (defaultParent !== null && defaultParent.tagName.toLowerCase() === 'frameset') { defaultParent = document.documentElement; } const fullscreenElement = DocumentUtil.getFullscreenElement(); if ( fullscreenElement === null || fullscreenElement.shadowRoot || fullscreenElement.openOrClosedShadowRoot // Available to Firefox 63+ for WebExtensions ) { return defaultParent; } switch (fullscreenElement.nodeName.toUpperCase()) { case 'IFRAME': case 'FRAME': return defaultParent; } return fullscreenElement; } /** * Computes the position where the popup should be placed relative to the source content. * @param {Rect[]} sourceRects The rectangles of the source content. * @param {string} writingMode The CSS writing mode of the source text. * @param {Rect} viewport The viewport that the popup can be placed within. * @returns {SizeRect} The calculated rectangle for where to position the popup. */ _getPosition(sourceRects, writingMode, viewport) { sourceRects = this._convertSourceRectsCoordinateSpace(sourceRects); const contentScale = this._contentScale; const scaleRatio = this._frameSizeContentScale === null ? 1.0 : contentScale / this._frameSizeContentScale; this._frameSizeContentScale = contentScale; const frameRect = this._frame.getBoundingClientRect(); const frameWidth = Math.max(frameRect.width * scaleRatio, this._initialWidth * contentScale); const frameHeight = Math.max(frameRect.height * scaleRatio, this._initialHeight * contentScale); const horizontal = (writingMode === 'horizontal-tb' || this._verticalTextPosition === 'default'); let preferAfter; let horizontalOffset; let verticalOffset; if (horizontal) { preferAfter = this._horizontalTextPositionBelow; horizontalOffset = this._horizontalOffset; verticalOffset = this._verticalOffset; } else { preferAfter = this._isVerticalTextPopupOnRight(this._verticalTextPosition, writingMode); horizontalOffset = this._horizontalOffset2; verticalOffset = this._verticalOffset2; } horizontalOffset *= contentScale; verticalOffset *= contentScale; let best = null; const sourceRectsLength = sourceRects.length; for (let i = 0, ii = (sourceRectsLength > 1 ? sourceRectsLength : 0); i <= ii; ++i) { const sourceRect = i < sourceRectsLength ? sourceRects[i] : this._getBoundingSourceRect(sourceRects); const result = ( horizontal ? this._getPositionForHorizontalText(sourceRect, frameWidth, frameHeight, viewport, horizontalOffset, verticalOffset, preferAfter) : this._getPositionForVerticalText(sourceRect, frameWidth, frameHeight, viewport, horizontalOffset, verticalOffset, preferAfter) ); if (i < ii && this._isOverlapping(result, sourceRects, i)) { continue; } if (best === null || result.height > best.height) { best = result; if (result.height >= frameHeight) { break; } } } return best; } /** * Computes the position where the popup should be placed for horizontal text. * @param {Rect} sourceRect The rectangle of the source content. * @param {number} frameWidth The preferred width of the frame. * @param {number} frameHeight The preferred height of the frame. * @param {Rect} viewport The viewport that the frame can be placed within. * @param {number} horizontalOffset The horizontal offset from the source rect that the popup will be placed. * @param {number} verticalOffset The vertical offset from the source rect that the popup will be placed. * @param {boolean} preferBelow Whether or not the popup is preferred to be placed below the source content. * @returns {SizeRect} The calculated rectangle for where to position the popup. */ _getPositionForHorizontalText(sourceRect, frameWidth, frameHeight, viewport, horizontalOffset, verticalOffset, preferBelow) { const [left, width, after] = this._getConstrainedPosition( sourceRect.right - horizontalOffset, sourceRect.left + horizontalOffset, frameWidth, viewport.left, viewport.right, true ); const [top, height, below] = this._getConstrainedPositionBinary( sourceRect.top - verticalOffset, sourceRect.bottom + verticalOffset, frameHeight, viewport.top, viewport.bottom, preferBelow ); return {left, top, width, height, after, below}; } /** * Computes the position where the popup should be placed for vertical text. * @param {Rect} sourceRect The rectangle of the source content. * @param {number} frameWidth The preferred width of the frame. * @param {number} frameHeight The preferred height of the frame. * @param {Rect} viewport The viewport that the frame can be placed within. * @param {number} horizontalOffset The horizontal offset from the source rect that the popup will be placed. * @param {number} verticalOffset The vertical offset from the source rect that the popup will be placed. * @param {boolean} preferRight Whether or not the popup is preferred to be placed to the right of the source content. * @returns {SizeRect} The calculated rectangle for where to position the popup. */ _getPositionForVerticalText(sourceRect, frameWidth, frameHeight, viewport, horizontalOffset, verticalOffset, preferRight) { const [left, width, after] = this._getConstrainedPositionBinary( sourceRect.left - horizontalOffset, sourceRect.right + horizontalOffset, frameWidth, viewport.left, viewport.right, preferRight ); const [top, height, below] = this._getConstrainedPosition( sourceRect.bottom - verticalOffset, sourceRect.top + verticalOffset, frameHeight, viewport.top, viewport.bottom, true ); return {left, top, width, height, after, below}; } _isVerticalTextPopupOnRight(positionPreference, writingMode) { switch (positionPreference) { case 'before': return !this._isWritingModeLeftToRight(writingMode); case 'after': return this._isWritingModeLeftToRight(writingMode); case 'right': return true; // case 'left': default: return false; } } _isWritingModeLeftToRight(writingMode) { switch (writingMode) { case 'vertical-lr': case 'sideways-lr': return true; default: return false; } } _getConstrainedPosition(positionBefore, positionAfter, size, minLimit, maxLimit, after) { size = Math.min(size, maxLimit - minLimit); let position; if (after) { position = Math.max(minLimit, positionAfter); position = position - Math.max(0, (position + size) - maxLimit); } else { position = Math.min(maxLimit, positionBefore) - size; position = position + Math.max(0, minLimit - position); } return [position, size, after]; } _getConstrainedPositionBinary(positionBefore, positionAfter, size, minLimit, maxLimit, after) { const overflowBefore = minLimit - (positionBefore - size); const overflowAfter = (positionAfter + size) - maxLimit; if (overflowAfter > 0 || overflowBefore > 0) { after = (overflowAfter < overflowBefore); } let position; if (after) { size -= Math.max(0, overflowAfter); position = Math.max(minLimit, positionAfter); } else { size -= Math.max(0, overflowBefore); position = Math.min(maxLimit, positionBefore) - size; } return [position, size, after]; } /** * Gets the visual viewport. * @param {boolean} useVisualViewport Whether or not the `window.visualViewport` should be used. * @returns {Rect} The rectangle of the visual viewport. */ _getViewport(useVisualViewport) { const visualViewport = window.visualViewport; if (visualViewport !== null && typeof visualViewport === 'object') { const left = visualViewport.offsetLeft; const top = visualViewport.offsetTop; const width = visualViewport.width; const height = visualViewport.height; if (useVisualViewport) { return { left, top, right: left + width, bottom: top + height }; } else { const scale = visualViewport.scale; return { left: 0, top: 0, right: Math.max(left + width, width * scale), bottom: Math.max(top + height, height * scale) }; } } return { left: 0, top: 0, right: window.innerWidth, bottom: window.innerHeight }; } async _setOptionsContext(optionsContext) { this._optionsContext = optionsContext; const options = await yomichan.api.optionsGet(optionsContext); const {general} = options; this._themeController.theme = general.popupTheme; this._themeController.outerTheme = general.popupOuterTheme; this._initialWidth = general.popupWidth; this._initialHeight = general.popupHeight; this._horizontalOffset = general.popupHorizontalOffset; this._verticalOffset = general.popupVerticalOffset; this._horizontalOffset2 = general.popupHorizontalOffset2; this._verticalOffset2 = general.popupVerticalOffset2; this._verticalTextPosition = general.popupVerticalTextPosition; this._horizontalTextPositionBelow = (general.popupHorizontalTextPosition === 'below'); this._displayMode = general.popupDisplayMode; this._displayModeIsFullWidth = (this._displayMode === 'full-width'); this._scaleRelativeToVisualViewport = general.popupScaleRelativeToVisualViewport; this._useSecureFrameUrl = general.useSecurePopupFrameUrl; this._useShadowDom = general.usePopupShadowDom; this._customOuterCss = general.customPopupOuterCss; this._optionsAssigned = true; this.updateTheme(); } async _setOptionsContextIfDifferent(optionsContext) { if (deepEqual(this._optionsContext, optionsContext)) { return; } await this._setOptionsContext(optionsContext); } /** * Computes the bounding rectangle for a set of rectangles. * @param {Rect[]} sourceRects An array of rectangles. * @returns {Rect} The bounding rectangle for all of the source rectangles. */ _getBoundingSourceRect(sourceRects) { switch (sourceRects.length) { case 0: return {left: 0, top: 0, right: 0, bottom: 0}; case 1: return sourceRects[0]; } let {left, top, right, bottom} = sourceRects[0]; for (let i = 1, ii = sourceRects.length; i < ii; ++i) { const sourceRect = sourceRects[i]; left = Math.min(left, sourceRect.left); top = Math.min(top, sourceRect.top); right = Math.max(right, sourceRect.right); bottom = Math.max(bottom, sourceRect.bottom); } return {left, top, right, bottom}; } /** * Checks whether or not a rectangle is overlapping any other rectangles. * @param {SizeRect} sizeRect The rectangles to check for overlaps. * @param {Rect[]} sourceRects The list of rectangles to compare against. * @param {number} ignoreIndex The index of an item in `sourceRects` to ignore. * @returns {boolean} `true` if `sizeRect` overlaps any one of `sourceRects`, excluding `sourceRects[ignoreIndex]`; `false` otherwise. */ _isOverlapping(sizeRect, sourceRects, ignoreIndex) { const {left, top} = sizeRect; const right = left + sizeRect.width; const bottom = top + sizeRect.height; for (let i = 0, ii = sourceRects.length; i < ii; ++i) { if (i === ignoreIndex) { continue; } const sourceRect = sourceRects[i]; if ( left < sourceRect.right && right > sourceRect.left && top < sourceRect.bottom && bottom > sourceRect.top ) { return true; } } return false; } /** * Gets the bounding client rect for the frame element, with a coordinate conversion applied. * @returns {DOMRect} The rectangle of the frame. */ _getFrameBoundingClientRect() { return DocumentUtil.convertRectZoomCoordinates(this._frame.getBoundingClientRect(), this._container); } /** * Converts the coordinate space of source rectangles. * @param {Rect[]} sourceRects The list of rectangles to convert. * @returns {Rect[]} Either an updated list of rectangles, or `sourceRects` if no change is required. */ _convertSourceRectsCoordinateSpace(sourceRects) { let scale = DocumentUtil.computeZoomScale(this._container); if (scale === 1) { return sourceRects; } scale = 1 / scale; const sourceRects2 = []; for (const rect of sourceRects) { sourceRects2.push(this._createScaledRect(rect, scale)); } return sourceRects2; } /** * Creates a scaled rectangle. * @param {Rect} rect The rectangle to scale. * @param {number} scale The scale factor. * @returns {Rect} A new rectangle which has been scaled. */ _createScaledRect(rect, scale) { return { left: rect.left * scale, top: rect.top * scale, right: rect.right * scale, bottom: rect.bottom * scale }; } }