angular-responsive-carousel
Version:
Carousel for Angular. A simple solution for horizontal scrolling images with lazy loading.
294 lines • 36.9 kB
JavaScript
export class Container {
constructor(carouselProperties, utils, cells) {
this.carouselProperties = carouselProperties;
this.utils = utils;
this.cells = cells;
/* The index of the new position relative to
* the active index, for example -1 or +1
*/
this.newPositionIndex = 0;
this.isPositionCorrection = false;
this.initialPositionX = 0;
this.initialElementPositionX = 0;
this.isLocked = true;
this.pullLimit = 100;
this.startTime = 0;
this.startX = 0;
this.moveX = 0;
this.isSwipeInProgress = false;
this.init();
}
get visibleWidth() {
return this.utils.visibleWidth;
}
get overflowCellsLimit() {
return this.utils.overflowCellsLimit;
}
get images() {
return this.carouselProperties.images;
}
get element() {
return this.carouselProperties.cellsElement;
}
get freeScroll() {
return this.carouselProperties.freeScroll;
}
get fullCellWidth() {
return this.carouselProperties.cellWidth + this.carouselProperties.margin;
}
get numberOfVisibleCells() {
return this.utils.numberOfVisibleCells;
}
get transitionDuration() {
return this.carouselProperties.transitionDuration;
}
get transitionTimingFunction() {
return this.carouselProperties.transitionTimingFunction;
}
get cellLength() {
if (this.images) {
return this.images.length;
}
else {
return this.cells.cellLength;
}
}
get cellLengthInLightDOMMode() {
if (this.images) {
let cellLength = this.numberOfVisibleCells + this.overflowCellsLimit * 2;
if (cellLength > this.images.length) {
cellLength = this.images.length;
}
return cellLength;
}
else {
return this.cellLength;
}
}
get tooFewCells() {
return this.numberOfVisibleCells > this.cellLength;
}
get disabled() {
return this.tooFewCells;
}
get margin() {
return this.carouselProperties.margin;
}
get isLightDOM() {
return this.carouselProperties.lightDOM || this.carouselProperties.loop;
}
updateProperties(carouselProperties) {
this.carouselProperties = carouselProperties;
}
init() {
this.setWidth();
}
handleTouchstart() {
this.startX = this.utils.getStartX(event);
this.startTime = new Date().getTime();
this.initialElementPositionX = this.getInitialElementPositionX();
}
handleHorizontalSwipe() {
if (this.disabled) {
return;
}
if (!this.isSwipeInProgress) {
this.startX = this.utils.getStartX(event);
this.startTime = new Date().getTime();
this.initialElementPositionX = this.getInitialElementPositionX();
}
this.isSwipeInProgress = true;
this.moveX = this.utils.getMoveX(event);
this.move();
}
handleTouchend(simpleProcessing = false) {
if (this.disabled) {
return;
}
/* If touchend was passed to the Slide class */
if (simpleProcessing) {
this.isSwipeInProgress = false;
return;
}
this.isSwipeInProgress = false;
this.finishMoving();
this.clearInitialValues();
}
move() {
let positionX = this.getMovePositionX();
const isPulled = this.detectPulled();
const direction = this.getDirection();
if (isPulled) {
if (isPulled.edge === "left" && direction === "right" ||
isPulled.edge === "right" && direction === "left") {
positionX = this.slowdownOnPull(positionX);
}
}
this.transformPositionX(positionX, 0);
if (this.freeScroll) {
this.initialPositionX = positionX;
}
if (isPulled) {
if (isPulled.edge === 'left' && isPulled.overflowX > this.pullLimit) {
this.initialPositionX = 0;
}
if (isPulled.edge === 'right' && isPulled.overflowX > this.pullLimit) {
this.initialPositionX = positionX;
}
}
}
getMovePositionX() {
const distance = this.getDistance();
return this.initialElementPositionX - distance;
}
getDistance() {
return this.startX - this.moveX;
}
/* If the container is pulled out of the left or right border */
detectPulled() {
const currentPositionX = this.getCurrentPositionX();
if (currentPositionX > 0) {
return {
edge: 'left',
positionX: currentPositionX,
overflowX: Math.abs(currentPositionX)
};
}
if (currentPositionX < this.getEndPosition()) {
return {
edge: 'right',
positionX: currentPositionX,
overflowX: Math.abs(currentPositionX - this.getEndPosition())
};
}
return undefined;
}
slowdownOnPull(_positionX) {
let distance = Math.abs(this.getDistance());
const endPosition = this.getEndPosition();
const isPulled = this.detectPulled();
if (!isPulled) {
return 0;
}
const decelerationRatio = 3 + isPulled.overflowX / 50;
let positionX = 0;
if (isPulled.edge === 'left') {
if (this.initialElementPositionX < 0) {
distance = distance - Math.abs(this.initialElementPositionX);
}
const rubberPositionX = distance / decelerationRatio;
positionX = rubberPositionX;
if (this.initialElementPositionX > 0) {
positionX = this.initialElementPositionX + rubberPositionX;
}
if (positionX > this.pullLimit) {
positionX = this.pullLimit;
}
}
if (isPulled.edge === 'right') {
const rubberPositionX = endPosition + (((this.initialElementPositionX - distance) - endPosition) / decelerationRatio);
const containerWidth = this.getWidth();
positionX = rubberPositionX;
if (this.initialElementPositionX < -(containerWidth - this.visibleWidth)) {
positionX = ((containerWidth - this.visibleWidth) + this.initialElementPositionX) + rubberPositionX;
}
if (positionX < endPosition - this.pullLimit) {
positionX = endPosition - this.pullLimit;
}
}
return positionX;
}
finishMoving() {
const positionX = this.getMovePositionX();
let newPositionX = 0;
if (this.freeScroll) {
newPositionX = this.getInertia();
}
/* Align container while pulling */
newPositionX = this.getAlignedPositionOnPull(newPositionX);
this.transformPositionX(newPositionX);
this.setInitialPosition(positionX);
}
/* Returns the new position of the container with inertia */
getInertia() {
const distance = this.getDistance();
const currentTime = new Date().getTime();
const tapLength = currentTime - this.startTime;
let inertia = (distance / tapLength) * 100;
return this.initialPositionX - inertia;
}
getAlignedPositionOnPull(newPositionX) {
const direction = this.getDirection();
if (direction === 'left') {
let endPosition = this.getEndPosition();
if (newPositionX < endPosition) {
return endPosition;
}
}
if (direction === 'right') {
if (newPositionX > 0) {
return 0;
}
}
return newPositionX;
}
getCurrentPositionX() {
const parentPosition = this.element.parentElement.getBoundingClientRect();
const position = this.element.getBoundingClientRect();
return position.left - parentPosition.left;
}
getEndPosition() {
if (this.isLightDOM) {
let imagesInContainer = this.cells.imageUtils.getImages();
return -(imagesInContainer.length * this.fullCellWidth - this.visibleWidth - this.margin);
}
else {
const width = this.getWidth();
const visibleWidth = this.element.parentElement.clientWidth;
return visibleWidth - width;
}
}
transformPositionX(value, duration = this.transitionDuration) {
if (value === undefined) {
return;
}
this.element.style.transition = 'transform ' + duration + 'ms ' + this.transitionTimingFunction;
this.element.style.transform = 'translateX(' + value + 'px)';
}
getWidth() {
let width = this.cellLengthInLightDOMMode * this.fullCellWidth;
let totalImageWidth = this.cellLength * this.fullCellWidth;
if (totalImageWidth < width) {
width = totalImageWidth;
}
return this.isLightDOM ? width : totalImageWidth;
}
setWidth() {
const width = this.getWidth();
this.element.style.width = width + "px";
}
setInitialPosition(position) {
this.initialPositionX = position;
}
getElementPosition() {
return this.element.getBoundingClientRect();
}
getInitialElementPositionX() {
const carouselElementPosition = this.utils.getCarouselElementPosition()['left'];
return this.getElementPosition()['left'] - carouselElementPosition;
}
clearInitialValues() {
this.startX = this.moveX = 0;
}
getDirection() {
const direction = Math.sign(this.startX - this.moveX);
if (direction === -1) {
return 'right';
}
if (direction === 1) {
return 'left';
}
return undefined;
}
}
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{Properties as CarouselProperties} from './interfaces';\r\n\r\nexport class Container {\r\n    /* The index of the new position relative to \r\n     * the active index, for example -1 or +1 \r\n     */\r\n    newPositionIndex: number = 0;\r\n    isPositionCorrection: boolean = false;\r\n    initialPositionX: number = 0;\r\n    initialElementPositionX: number = 0;\r\n    isLocked: boolean = true;\r\n    pullLimit: number = 100;\r\n    startTime: number = 0;\r\n    startX: number = 0;\r\n    moveX: number = 0;\r\n    isSwipeInProgress: boolean = false;\r\n\r\n    get visibleWidth() {\r\n        return this.utils.visibleWidth;\r\n    }\r\n\r\n    get overflowCellsLimit() {\r\n        return this.utils.overflowCellsLimit;\r\n    }\r\n\r\n    get images() {\r\n        return this.carouselProperties.images;\r\n    }\r\n\r\n    get element() {\r\n        return this.carouselProperties.cellsElement;\r\n    }\r\n\r\n    get freeScroll() {\r\n        return this.carouselProperties.freeScroll;\r\n    }\r\n\r\n    get fullCellWidth() {\r\n        return this.carouselProperties.cellWidth + this.carouselProperties.margin;\r\n    }\r\n\r\n    get numberOfVisibleCells() {\r\n        return this.utils.numberOfVisibleCells;\r\n    }\r\n\r\n    get transitionDuration() {\r\n        return this.carouselProperties.transitionDuration;\r\n    }\r\n\r\n    get transitionTimingFunction() {\r\n        return this.carouselProperties.transitionTimingFunction;\r\n    }\r\n\r\n    get cellLength() {\r\n        if (this.images) {\r\n            return this.images.length;\r\n        } else {\r\n            return this.cells.cellLength;\r\n        }\r\n    }\r\n\r\n    get cellLengthInLightDOMMode() {\r\n        if (this.images) {\r\n            let cellLength = this.numberOfVisibleCells + this.overflowCellsLimit * 2;\r\n            if (cellLength > this.images.length) {\r\n                cellLength = this.images.length;\r\n            }\r\n            return cellLength;\r\n        } else {\r\n            return this.cellLength;\r\n        }\r\n    }\r\n\r\n    get tooFewCells() {\r\n        return this.numberOfVisibleCells > this.cellLength;\r\n    }\r\n\r\n    get disabled() {\r\n        return this.tooFewCells;\r\n    }\r\n\r\n    get margin() {\r\n        return this.carouselProperties.margin;\r\n    }\r\n\r\n    get isLightDOM() {\r\n        return this.carouselProperties.lightDOM || this.carouselProperties.loop;\r\n    }\r\n\r\n    constructor(private carouselProperties: CarouselProperties,\r\n        private utils:any,\r\n        private cells:any) {\r\n\r\n        this.init()\r\n    }\r\n\r\n    updateProperties(carouselProperties: CarouselProperties) {\r\n        this.carouselProperties = carouselProperties;\r\n    }\r\n\r\n    init() {\r\n        this.setWidth();\r\n    }\r\n\r\n    handleTouchstart() {\r\n        this.startX = this.utils.getStartX(event);\r\n        this.startTime = new Date().getTime();\r\n        this.initialElementPositionX = this.getInitialElementPositionX();\r\n    }\r\n\r\n    handleHorizontalSwipe() {\r\n        if (this.disabled) {\r\n            return;\r\n        }\r\n\r\n        if (!this.isSwipeInProgress) {\r\n            this.startX = this.utils.getStartX(event);\r\n            this.startTime = new Date().getTime();\r\n            this.initialElementPositionX = this.getInitialElementPositionX();\r\n        }\r\n\r\n        this.isSwipeInProgress = true;\r\n        this.moveX = this.utils.getMoveX(event);\r\n        this.move();\r\n    }\r\n\r\n    handleTouchend(simpleProcessing: boolean = false) {\r\n        if (this.disabled) {\r\n            return;\r\n        }\r\n\r\n        /* If touchend was passed to the Slide class */\r\n        if (simpleProcessing) {\r\n            this.isSwipeInProgress = false;\r\n            return;\r\n        }\r\n\r\n        this.isSwipeInProgress = false;\r\n        this.finishMoving();\r\n        this.clearInitialValues();\r\n    }\r\n\r\n    move() {\r\n        let positionX: number = this.getMovePositionX();\r\n        const isPulled = this.detectPulled();\r\n        const direction = this.getDirection();\r\n\r\n        if (isPulled) {\r\n            if (isPulled.edge === \"left\" && direction === \"right\" ||\r\n                isPulled.edge === \"right\" && direction === \"left\") {\r\n                positionX = this.slowdownOnPull(positionX);\r\n            }\r\n        }\r\n\r\n        this.transformPositionX(positionX, 0);\r\n\r\n        if (this.freeScroll) {\r\n            this.initialPositionX = positionX;\r\n        }\r\n\r\n        if (isPulled) {\r\n            if (isPulled.edge === 'left' && isPulled.overflowX > this.pullLimit) {\r\n                this.initialPositionX = 0;\r\n            }\r\n            if (isPulled.edge === 'right' && isPulled.overflowX > this.pullLimit) {\r\n                this.initialPositionX = positionX;\r\n            }\r\n        }\r\n    }\r\n\r\n    getMovePositionX() {\r\n        const distance = this.getDistance();\r\n        return this.initialElementPositionX - distance;\r\n    }\r\n\r\n    getDistance() {\r\n        return this.startX - this.moveX;\r\n    }\r\n\r\n    /* If the container is pulled out of the left or right border */\r\n    detectPulled() {\r\n        const currentPositionX = this.getCurrentPositionX();\r\n\r\n        if (currentPositionX > 0) {\r\n            return {\r\n                edge: 'left',\r\n                positionX: currentPositionX,\r\n                overflowX: Math.abs(currentPositionX)\r\n            }\r\n        }\r\n\r\n        if (currentPositionX < this.getEndPosition()) {\r\n            return {\r\n                edge: 'right',\r\n                positionX: currentPositionX,\r\n                overflowX: Math.abs(currentPositionX - this.getEndPosition())\r\n            }\r\n        }\r\n\r\n        return undefined;\r\n    }\r\n\r\n    slowdownOnPull(_positionX: number) {\r\n        let distance = Math.abs(this.getDistance());\r\n        const endPosition = this.getEndPosition();\r\n        const isPulled = this.detectPulled();\r\n\r\n        if (!isPulled) {\r\n            return 0;\r\n        }\r\n\r\n        const decelerationRatio = 3 + isPulled.overflowX / 50;\r\n        let positionX:number = 0;\r\n\r\n        if (isPulled.edge === 'left') {\r\n\r\n            if (this.initialElementPositionX < 0) {\r\n                distance = distance - Math.abs(this.initialElementPositionX);\r\n            }\r\n\r\n            const rubberPositionX = distance / decelerationRatio;\r\n            positionX = rubberPositionX;\r\n\r\n            if (this.initialElementPositionX > 0) {\r\n                positionX = this.initialElementPositionX + rubberPositionX;\r\n            }\r\n\r\n            if (positionX > this.pullLimit) {\r\n                positionX = this.pullLimit;\r\n            }\r\n        }\r\n\r\n        if (isPulled.edge === 'right') {\r\n            const rubberPositionX = endPosition + (((this.initialElementPositionX - distance) - endPosition) / decelerationRatio);\r\n            const containerWidth = this.getWidth();\r\n\r\n            positionX = rubberPositionX;\r\n\r\n            if (this.initialElementPositionX < -(containerWidth - this.visibleWidth)) {\r\n                positionX = ((containerWidth - this.visibleWidth) + this.initialElementPositionX) + rubberPositionX;\r\n            }\r\n\r\n            if (positionX < endPosition - this.pullLimit) {\r\n                positionX = endPosition - this.pullLimit;\r\n            }\r\n        }\r\n\r\n        return positionX;\r\n    }\r\n\r\n    finishMoving() {\r\n        const positionX = this.getMovePositionX();\r\n        let newPositionX:number = 0;\r\n\r\n        if (this.freeScroll) {\r\n            newPositionX = this.getInertia();\r\n        }\r\n\r\n        /* Align container while pulling */\r\n        newPositionX = this.getAlignedPositionOnPull(newPositionX);\r\n\r\n        this.transformPositionX(newPositionX);\r\n        this.setInitialPosition(positionX);\r\n    }\r\n\r\n    /* Returns the new position of the container with inertia */\r\n    getInertia() {\r\n        const distance = this.getDistance();\r\n        const currentTime = new Date().getTime();\r\n        const tapLength = currentTime - this.startTime;\r\n        let inertia = (distance / tapLength) * 100;\r\n\r\n        return this.initialPositionX - inertia;\r\n    }\r\n\r\n    getAlignedPositionOnPull(newPositionX:number) {\r\n        const direction = this.getDirection();\r\n\r\n        if (direction === 'left') {\r\n            let endPosition = this.getEndPosition();\r\n            if (newPositionX < endPosition) {\r\n                return endPosition;\r\n            }\r\n        }\r\n        if (direction === 'right') {\r\n            if (newPositionX > 0) {\r\n                return 0;\r\n            }\r\n        }\r\n\r\n        return newPositionX;\r\n    }\r\n\r\n    getCurrentPositionX() {\r\n        const parentPosition = this.element!.parentElement!.getBoundingClientRect();\r\n        const position = this.element.getBoundingClientRect();\r\n        return position.left - parentPosition.left;\r\n    }\r\n\r\n    getEndPosition() {\r\n        if (this.isLightDOM) {\r\n            let imagesInContainer = this.cells.imageUtils.getImages();\r\n            return -(imagesInContainer.length * this.fullCellWidth - this.visibleWidth - this.margin);\r\n        } else {\r\n            const width = this.getWidth();\r\n            const visibleWidth = this.element!.parentElement!.clientWidth;\r\n            return visibleWidth - width;\r\n        }\r\n    }\r\n\r\n    transformPositionX(value:number, duration = this.transitionDuration) {\r\n        if (value === undefined) {\r\n            return;\r\n        }\r\n\r\n        this.element.style.transition = 'transform ' + duration + 'ms ' + this.transitionTimingFunction;\r\n        this.element.style.transform = 'translateX(' + value + 'px)';\r\n    }\r\n\r\n    getWidth() {\r\n        let width = this.cellLengthInLightDOMMode * this.fullCellWidth;\r\n        let totalImageWidth = this.cellLength * this.fullCellWidth;\r\n\r\n        if (totalImageWidth < width) {\r\n            width = totalImageWidth;\r\n        }\r\n\r\n        return this.isLightDOM ? width : totalImageWidth;\r\n    }\r\n\r\n    setWidth() {\r\n        const width = this.getWidth();\r\n        this.element.style.width = width + \"px\";\r\n    }\r\n\r\n    setInitialPosition(position:number) {\r\n        this.initialPositionX = position;\r\n    }\r\n\r\n    getElementPosition() {\r\n        return this.element.getBoundingClientRect();\r\n    }\r\n\r\n    getInitialElementPositionX() {\r\n        const carouselElementPosition = this.utils.getCarouselElementPosition()['left'];\r\n        return this.getElementPosition()['left'] - carouselElementPosition;\r\n    }\r\n\r\n    clearInitialValues() {\r\n        this.startX = this.moveX = 0;\r\n    }\r\n\r\n    getDirection() {\r\n        const direction = Math.sign(this.startX - this.moveX);\r\n\r\n        if (direction === -1) {\r\n            return 'right';\r\n        }\r\n        if (direction === 1) {\r\n            return 'left';\r\n        }\r\n\r\n        return undefined;\r\n    }\r\n}"]}