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import { Tag, Dom, Cache, Type } from 'main.core';
import { EventEmitter } from 'main.core.events';
import { TouchController } from './touch-controller';
import './style.css';
export class Ears extends EventEmitter
{
constructor(options)
{
super(...arguments);
this.setEventNamespace('BX.UI.Ears');
this.container = options.container || null;
this.smallSize = options.smallSize || null;
this.noScrollbar = options.noScrollbar ? options.noScrollbar : false;
this.className = options.className ? options.className : null;
this.mousewheel = options.mousewheel || null;
this.touchScroll = options.touchScroll || null;
this.vertical = options.vertical || null;
this.itemsInShow = options.itemsInShow || null;
if (this.itemsInShow)
{
this.noScrollbar = true;
}
this.itemSize = null;
// layouts
this.wrapper = null;
this.leftEar = null;
this.rightEar = null;
this.topEar = null;
this.bottomEar = null;
this.parentContainer = Type.isDomNode(this.container) ? this.container.parentNode : null;
this.delay = 12;
this.scrollTimeout = null;
this.cache = new Cache.MemoryCache();
}
bindEvents()
{
this.container.addEventListener('scroll', this.toggleEars.bind(this));
if (this.mousewheel)
{
this.container.addEventListener('wheel', this.onWheel.bind(this));
}
if (this.vertical)
{
if (this.itemsInShow)
{
this.getBottomEar().addEventListener('click', this.scrollToNext.bind(this));
this.getTopEar().addEventListener('click', this.scrollToPrev.bind(this));
}
else
{
this.getBottomEar().addEventListener('mouseenter', this.scrollBottom.bind(this));
this.getBottomEar().addEventListener('mouseleave', this.stopScroll.bind(this));
this.getBottomEar().addEventListener('mousedown', this.stopScroll.bind(this));
this.getBottomEar().addEventListener('mouseup', this.scrollBottom.bind(this));
this.getTopEar().addEventListener('mouseenter', this.scrollTop.bind(this));
this.getTopEar().addEventListener('mouseleave', this.stopScroll.bind(this));
this.getTopEar().addEventListener('mousedown', this.stopScroll.bind(this));
this.getTopEar().addEventListener('mouseup', this.scrollTop.bind(this));
}
}
if (!this.vertical)
{
if (this.itemsInShow)
{
this.getRightEar().addEventListener('click', this.scrollToNext.bind(this));
this.getLeftEar().addEventListener('click', this.scrollToPrev.bind(this));
}
else
{
this.getLeftEar().addEventListener('mouseenter', this.scrollLeft.bind(this));
this.getLeftEar().addEventListener('mouseleave', this.stopScroll.bind(this));
this.getLeftEar().addEventListener('mousedown', this.stopScroll.bind(this));
this.getLeftEar().addEventListener('mouseup', this.scrollLeft.bind(this));
this.getRightEar().addEventListener('mouseenter', this.scrollRight.bind(this));
this.getRightEar().addEventListener('mouseleave', this.stopScroll.bind(this));
this.getRightEar().addEventListener('mousedown', this.stopScroll.bind(this));
this.getRightEar().addEventListener('mouseup', this.scrollRight.bind(this));
}
}
}
init(): this
{
if (!this.container)
{
console.warn('BX.UI.Ears.Preview: \'container\' is not defined');
return;
}
this.setWrapper();
this.bindEvents();
if (this.touchScroll)
{
this.initTouchScroll();
}
setTimeout(() => {
if (this.container.scrollWidth > this.container.offsetWidth)
{
this.toggleRightEar();
let activeItem = this.container.querySelector('[data-role="ui-ears-active"]');
activeItem ? this.scrollToActiveItem(activeItem) : null;
}
this.toggleEars();
}, 600);
return this;
}
scrollToPrev()
{
if (this.vertical)
{
this.container.scrollTo({
top: this.container.scrollTop - this.getItemSize(),
behavior: 'smooth'
});
}
else
{
this.container.scrollTo({
left: this.container.scrollLeft - this.getItemSize(),
behavior: 'smooth'
});
}
}
scrollToNext()
{
if (this.vertical)
{
this.container.scrollTo({
top: this.container.scrollTop + this.getItemSize(),
behavior: 'smooth'
});
}
else
{
this.container.scrollTo({
left: this.container.scrollLeft + this.getItemSize(),
behavior: 'smooth'
});
}
}
scrollToActiveItem(activeItem)
{
let scrollToPoint = activeItem.offsetLeft - (this.container.offsetWidth / 2 - activeItem.offsetWidth / 2);
let scrollWidth = 0;
let interval = setInterval(() => {
if( scrollWidth >= scrollToPoint ||
scrollWidth + this.container.offsetWidth >= this.container.scrollWidth)
{
clearInterval(interval);
}
this.container.scrollLeft = scrollWidth += 10;
},10)
}
onWheel(event)
{
if (event.deltaY < 0 || event.deltaX > 0)
{
this.scrollRight();
}
else
{
this.scrollLeft();
}
clearTimeout(this.scrollTimeout);
this.scrollTimeout = setTimeout(() => this.stopScroll(), 150);
event.preventDefault();
}
getItemSize()
{
if (!this.itemSize)
{
const itemNode = this.container.firstElementChild;
this.itemSize = this.vertical
? this.container.firstElementChild.offsetHeight
: this.container.firstElementChild.offsetWidth;
let spaceInt = 0;
if (this.vertical)
{
spaceInt = parseInt(window.getComputedStyle(itemNode).marginTop) > parseInt(window.getComputedStyle(itemNode).marginTop)
? parseInt(window.getComputedStyle(itemNode).marginTop)
: parseInt(window.getComputedStyle(itemNode).marginBottom);
}
else
{
spaceInt = parseInt(window.getComputedStyle(itemNode).marginLeft) + parseInt(window.getComputedStyle(itemNode).marginRight);
}
if (spaceInt > 0)
{
this.itemSize = this.itemSize + spaceInt;
}
}
return this.itemSize;
}
setWrapper() {
this.container.classList.add('ui-ear-container');
this.container.classList.add(this.vertical ? '--vertical' : '--horizontal');
if (this.noScrollbar)
{
this.container.classList.add('ui-ear-container-no-scrollbar');
}
Dom.append(this.getWrapper(), this.parentContainer);
if (this.itemsInShow)
{
this.container.style.setProperty(this.vertical ? 'height' : 'width', this.getItemSize() * this.itemsInShow + 'px');
}
}
getWrapper()
{
return this.cache.remember('wrapper', () => {
return Tag.render`
<div class='ui-ears-wrapper ${this.smallSize ? ' ui-ears-wrapper-sm' : ''} ${this.className ? this.className : ''}'>
${this.vertical ? this.getTopEar() : this.getLeftEar() }
${this.vertical ? this.getBottomEar() : this.getRightEar()}
${this.container}
</div>
`;
});
}
getTopEar()
{
return this.cache.remember('topEar', () => {
return Tag.render`
<div class='ui-ear ui-ear-top'></div>
`;
});
}
getBottomEar()
{
return this.cache.remember('bottomEar', () => {
return Tag.render`
<div class='ui-ear ui-ear-bottom'></div>
`;
});
}
getLeftEar()
{
return this.cache.remember('leftEar', () => {
return Tag.render`
<div class='ui-ear ui-ear-left'></div>
`;
});
}
getRightEar()
{
return this.cache.remember('rightEar', () => {
return Tag.render`
<div class='ui-ear ui-ear-right'></div>
`;
});
}
toggleEars()
{
if (this.vertical)
{
this.toggleTopEar();
this.toggleBottomEar();
}
else
{
this.toggleRightEar();
this.toggleLeftEar();
}
}
toggleTopEar()
{
if (this.container.scrollTop > 0)
{
this.getTopEar().classList.add('ui-ear-show');
}
else
{
this.getTopEar().classList.remove('ui-ear-show');
}
}
toggleBottomEar()
{
if (this.container.scrollHeight > this.container.offsetHeight
&& Math.ceil(this.container.offsetHeight + this.container.scrollTop) < this.container.scrollHeight)
{
this.getBottomEar().classList.add('ui-ear-show');
}
else
{
this.getBottomEar().classList.remove('ui-ear-show');
}
}
toggleRightEar()
{
if (this.container.scrollWidth > this.container.offsetWidth
&& Math.ceil(this.container.offsetWidth + this.container.scrollLeft) < this.container.scrollWidth)
{
this.getRightEar().classList.add('ui-ear-show');
}
else
{
this.getRightEar().classList.remove('ui-ear-show');
}
}
toggleLeftEar()
{
if (this.container.scrollLeft > 0)
{
this.getLeftEar().classList.add('ui-ear-show');
}
else
{
this.getLeftEar().classList.remove('ui-ear-show');
}
}
scrollTop()
{
this.stopScroll('bottom');
this.container.scrollTop -= 10;
this.emit('onEarsAreMoved');
if (this.container.scrollTop <= 10)
{
this.emit('onEarsAreHidden');
}
this.setDelay();
this.scrollInterval = setInterval(
this.scrollTop.bind(this),
this.delay);
this.top = true;
}
scrollBottom()
{
this.stopScroll('top');
let previous = this.container.scrollTop;
this.container.scrollTop += 10;
this.emit('onEarsAreMoved');
if (this.container.scrollTop >= 0 && previous < 0)
{
this.emit('onEarsAreHidden');
}
this.setDelay();
this.scrollInterval = setInterval(
this.scrollBottom.bind(this),
this.delay);
this.bottom = true;
}
scrollLeft()
{
this.stopScroll('right');
let previous = this.container.scrollLeft;
this.container.scrollLeft -= 10;
this.emit('onEarsAreMoved');
if (this.container.scrollLeft <= 0 && previous > 0)
{
this.emit('onEarsAreHidden');
}
this.setDelay();
this.scrollInterval = setInterval(
this.scrollLeft.bind(this),
this.delay);
this.left = true;
}
scrollRight()
{
this.stopScroll('left');
this.container.scrollLeft += 10;
this.emit('onEarsAreMoved');
if (this.container.scrollLeft <= 10)
{
this.emit('onEarsAreShown');
}
this.setDelay();
this.scrollInterval = setInterval(
this.scrollRight.bind(this),
this.delay);
this.right = true;
}
setDelay()
{
if (this.container.scrollWidth < this.container.offsetWidth * 1.6)
{
this.delay = 20;
return;
}
const fullScrollLeft = this.container.scrollWidth - this.container.offsetWidth;
const conditionRight = this.container.scrollLeft > fullScrollLeft / 1.3;
const conditionLeft = this.container.scrollLeft < fullScrollLeft / 4;
if (this.container.scrollLeft === fullScrollLeft)
{
this.delay = 12;
}
if (this.left)
{
if (conditionLeft)
{
this.delay = 25;
}
else {
this.delay = 12;
}
}
if (this.right)
{
if (conditionRight)
{
this.delay = 25;
}
else {
this.delay = 12;
}
}
}
stopScroll(direction) {
if (this.scrollInterval)
{
clearInterval(this.scrollInterval);
this.scrollInterval = 0;
}
if (direction === 'right')
{
this.right = false;
}
else if (direction === 'left')
{
this.left = false;
}
else if (direction === 'bottom')
{
this.bottom = false;
}
else if (direction === 'top')
{
this.top = false;
}
}
initTouchScroll()
{
new TouchController({
target: this.container
});
}
}