yomichan/ext/js/app/popup.js

934 lines
32 KiB
JavaScript

/*
* 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
* @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._frame.getBoundingClientRect();
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._frame.getBoundingClientRect();
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;
}
/**
* @param {Rect[]} sourceRects
* @param {string} writingMode
* @returns {SizeRect}
*/
_getPosition(sourceRects, writingMode, viewport) {
const scale = this._contentScale;
const scaleRatio = this._frameSizeContentScale === null ? 1.0 : scale / this._frameSizeContentScale;
this._frameSizeContentScale = scale;
const frameRect = this._frame.getBoundingClientRect();
const frameWidth = Math.max(frameRect.width * scaleRatio, this._initialWidth * scale);
const frameHeight = Math.max(frameRect.height * scaleRatio, this._initialHeight * scale);
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 *= scale;
verticalOffset *= scale;
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;
}
/**
* @returns {SizeRect}
*/
_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};
}
/**
* @returns {SizeRect}
*/
_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];
}
_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);
}
/**
* @param {Rect[]} sourceRects
* @returns {Rect}
*/
_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};
}
/**
* @param {SizeRect} sizeRect
* @param {Rect[]} sourceRects
* @param {number} ignoreIndex
* @returns {boolean}
*/
_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;
}
}