carousel-angular
Version:
A simple carousel component for Angular 14+ based on 'angular-responsive-carousel' by Ivy Laboratory http://ivylab.space
258 lines • 29.9 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.initialPositionX = 0;
this.initialElementPositionX = 0;
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 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() {
return this.cells.cellLength;
}
get tooFewCells() {
return this.numberOfVisibleCells > this.cellLength;
}
get disabled() {
return this.tooFewCells;
}
get margin() {
return this.carouselProperties.margin;
}
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 -= 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;
const inertia = (distance / tapLength) * 100;
return this.initialPositionX - inertia;
}
getAlignedPositionOnPull(newPositionX) {
const direction = this.getDirection();
if (direction === 'left') {
const endPosition = this.getEndPosition();
if (newPositionX < endPosition) {
return endPosition;
}
}
return newPositionX;
}
getCurrentPositionX() {
const parentPosition = this.element.parentElement.getBoundingClientRect();
const position = this.element.getBoundingClientRect();
return position.left - parentPosition.left;
}
getEndPosition() {
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() {
return this.cellLength * this.fullCellWidth;
}
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';\n\nexport class Container {\n  /* The index of the new position relative to\n   * the active index, for example -1 or +1\n   */\n  initialPositionX = 0;\n\n  initialElementPositionX = 0;\n\n  pullLimit = 100;\n\n  startTime = 0;\n\n  startX = 0;\n\n  moveX = 0;\n\n  isSwipeInProgress = false;\n\n  get visibleWidth() {\n    return this.utils.visibleWidth;\n  }\n\n  get overflowCellsLimit() {\n    return this.utils.overflowCellsLimit;\n  }\n\n  get element() {\n    return this.carouselProperties.cellsElement;\n  }\n\n  get freeScroll() {\n    return this.carouselProperties.freeScroll;\n  }\n\n  get fullCellWidth() {\n    return this.carouselProperties.cellWidth + this.carouselProperties.margin;\n  }\n\n  get numberOfVisibleCells() {\n    return this.utils.numberOfVisibleCells;\n  }\n\n  get transitionDuration() {\n    return this.carouselProperties.transitionDuration;\n  }\n\n  get transitionTimingFunction() {\n    return this.carouselProperties.transitionTimingFunction;\n  }\n\n  get cellLength() {\n    return this.cells.cellLength;\n  }\n\n  get tooFewCells() {\n    return this.numberOfVisibleCells > this.cellLength;\n  }\n\n  get disabled() {\n    return this.tooFewCells;\n  }\n\n  get margin() {\n    return this.carouselProperties.margin;\n  }\n\n  constructor(\n    private carouselProperties: CarouselProperties,\n    private utils: any,\n    private cells: any\n  ) {\n    this.init();\n  }\n\n  updateProperties(carouselProperties: CarouselProperties) {\n    this.carouselProperties = carouselProperties;\n  }\n\n  init() {\n    this.setWidth();\n  }\n\n  handleTouchstart() {\n    this.startX = this.utils.getStartX(event);\n    this.startTime = new Date().getTime();\n    this.initialElementPositionX = this.getInitialElementPositionX();\n  }\n\n  handleHorizontalSwipe() {\n    if (this.disabled) {\n      return;\n    }\n\n    if (!this.isSwipeInProgress) {\n      this.startX = this.utils.getStartX(event);\n      this.startTime = new Date().getTime();\n      this.initialElementPositionX = this.getInitialElementPositionX();\n    }\n\n    this.isSwipeInProgress = true;\n    this.moveX = this.utils.getMoveX(event);\n    this.move();\n  }\n\n  handleTouchend(simpleProcessing = false) {\n    if (this.disabled) {\n      return;\n    }\n\n    /* If touchend was passed to the Slide class */\n    if (simpleProcessing) {\n      this.isSwipeInProgress = false;\n      return;\n    }\n\n    this.isSwipeInProgress = false;\n    this.finishMoving();\n    this.clearInitialValues();\n  }\n\n  move() {\n    let positionX: number = this.getMovePositionX();\n    const isPulled = this.detectPulled();\n    const direction = this.getDirection();\n\n    if (isPulled) {\n      if (\n        (isPulled.edge === 'left' && direction === 'right') ||\n        (isPulled.edge === 'right' && direction === 'left')\n      ) {\n        positionX = this.slowdownOnPull(positionX);\n      }\n    }\n\n    this.transformPositionX(positionX, 0);\n\n    if (this.freeScroll) {\n      this.initialPositionX = positionX;\n    }\n\n    if (isPulled) {\n      if (isPulled.edge === 'left' && isPulled.overflowX > this.pullLimit) {\n        this.initialPositionX = 0;\n      }\n      if (isPulled.edge === 'right' && isPulled.overflowX > this.pullLimit) {\n        this.initialPositionX = positionX;\n      }\n    }\n  }\n\n  getMovePositionX() {\n    const distance = this.getDistance();\n    return this.initialElementPositionX - distance;\n  }\n\n  getDistance() {\n    return this.startX - this.moveX;\n  }\n\n  /* If the container is pulled out of the left or right border */\n  detectPulled() {\n    const currentPositionX = this.getCurrentPositionX();\n\n    if (currentPositionX > 0) {\n      return {\n        edge: 'left',\n        positionX: currentPositionX,\n        overflowX: Math.abs(currentPositionX)\n      };\n    }\n\n    if (currentPositionX < this.getEndPosition()) {\n      return {\n        edge: 'right',\n        positionX: currentPositionX,\n        overflowX: Math.abs(currentPositionX - this.getEndPosition())\n      };\n    }\n\n    return undefined;\n  }\n\n  slowdownOnPull(_positionX: number) {\n    let distance = Math.abs(this.getDistance());\n    const endPosition = this.getEndPosition();\n    const isPulled = this.detectPulled();\n\n    if (!isPulled) {\n      return 0;\n    }\n\n    const decelerationRatio = 3 + isPulled.overflowX / 50;\n    let positionX = 0;\n\n    if (isPulled.edge === 'left') {\n      if (this.initialElementPositionX < 0) {\n        distance -= Math.abs(this.initialElementPositionX);\n      }\n\n      const rubberPositionX = distance / decelerationRatio;\n      positionX = rubberPositionX;\n\n      if (this.initialElementPositionX > 0) {\n        positionX = this.initialElementPositionX + rubberPositionX;\n      }\n\n      if (positionX > this.pullLimit) {\n        positionX = this.pullLimit;\n      }\n    }\n\n    if (isPulled.edge === 'right') {\n      const rubberPositionX =\n        endPosition +\n        (this.initialElementPositionX - distance - endPosition) /\n          decelerationRatio;\n      const containerWidth = this.getWidth();\n\n      positionX = rubberPositionX;\n\n      if (\n        this.initialElementPositionX < -(containerWidth - this.visibleWidth)\n      ) {\n        positionX =\n          containerWidth -\n          this.visibleWidth +\n          this.initialElementPositionX +\n          rubberPositionX;\n      }\n\n      if (positionX < endPosition - this.pullLimit) {\n        positionX = endPosition - this.pullLimit;\n      }\n    }\n\n    return positionX;\n  }\n\n  finishMoving() {\n    const positionX = this.getMovePositionX();\n    let newPositionX = 0;\n\n    if (this.freeScroll) {\n      newPositionX = this.getInertia();\n    }\n\n    /* Align container while pulling */\n    newPositionX = this.getAlignedPositionOnPull(newPositionX);\n\n    this.transformPositionX(newPositionX);\n    this.setInitialPosition(positionX);\n  }\n\n  /* Returns the new position of the container with inertia */\n  getInertia() {\n    const distance = this.getDistance();\n    const currentTime = new Date().getTime();\n    const tapLength = currentTime - this.startTime;\n    const inertia = (distance / tapLength) * 100;\n\n    return this.initialPositionX - inertia;\n  }\n\n  getAlignedPositionOnPull(newPositionX: number) {\n    const direction = this.getDirection();\n\n    if (direction === 'left') {\n      const endPosition = this.getEndPosition();\n      if (newPositionX < endPosition) {\n        return endPosition;\n      }\n    }\n\n    return newPositionX;\n  }\n\n  getCurrentPositionX() {\n    const parentPosition = this.element!.parentElement!.getBoundingClientRect();\n    const position = this.element.getBoundingClientRect();\n    return position.left - parentPosition.left;\n  }\n\n  getEndPosition() {\n    const width = this.getWidth();\n    const visibleWidth = this.element!.parentElement!.clientWidth;\n    return visibleWidth - width;\n  }\n\n  transformPositionX(value: number, duration = this.transitionDuration) {\n    if (value === undefined) {\n      return;\n    }\n\n    this.element.style.transition = `transform ${duration}ms ${this.transitionTimingFunction}`;\n    this.element.style.transform = `translateX(${value}px)`;\n  }\n\n  getWidth() {\n    return this.cellLength * this.fullCellWidth;\n  }\n\n  setWidth() {\n    const width = this.getWidth();\n    this.element.style.width = `${width}px`;\n  }\n\n  setInitialPosition(position: number) {\n    this.initialPositionX = position;\n  }\n\n  getElementPosition() {\n    return this.element.getBoundingClientRect();\n  }\n\n  getInitialElementPositionX() {\n    const carouselElementPosition =\n      this.utils.getCarouselElementPosition().left;\n    return this.getElementPosition().left - carouselElementPosition;\n  }\n\n  clearInitialValues() {\n    this.startX = this.moveX = 0;\n  }\n\n  getDirection() {\n    const direction = Math.sign(this.startX - this.moveX);\n\n    if (direction === -1) {\n      return 'right';\n    }\n    if (direction === 1) {\n      return 'left';\n    }\n\n    return undefined;\n  }\n}\n"]}