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| /*
* @license
* Copyright Hôpitaux Universitaires de Genève. All Rights Reserved.
*
* Use of this source code is governed by an Apache-2.0 license that can be
* found in the LICENSE file at https://github.com/DSI-HUG/dejajs-components/blob/master/LICENSE
*/
/**
* Licensed under MIT https://github.com/rd-dev-ukraine/angular-io-slimscroll/blob/master/LICENSE
*/
import { Directive, ElementRef, HostListener, Input, OnDestroy, OnInit, Renderer2, RendererFactory2 } from '@angular/core';
import { Subscription, timer as observableTimer } from 'rxjs';
import { filter, first } from 'rxjs/operators';
interface SlimScrollOptions {
// width in pixels of the visible scroll area
width: string;
// height in pixels of the visible scroll area
height: string;
// width in pixels of the scrollbar and rail
size: string;
// scrollbar color, accepts any hex/color value
color: string;
// scrollbar position - left/right
position: string;
// distance in pixels between the side edge and the scrollbar
distance: string;
// default scroll position on load - top / bottom
start: string;
// sets scrollbar opacity
opacity: number;
// set transition for opacity
transition: number;
// enables always-on mode for the scrollbar
alwaysVisible: boolean;
// check if we should hide the scrollbar when user is hovering over
disableFadeOut: boolean;
// sets visibility of the rail
railVisible: boolean;
// sets rail color
railColor: string;
// sets rail opacity
railOpacity: number;
// defautlt CSS class of the slimscroll rail
railClass: string;
// defautlt CSS class of the slimscroll bar
barClass: string;
// defautlt CSS class of the slimscroll wrapper
wrapperClass: string;
// check if mousewheel should scroll the window if we reach top/bottom
allowPageScroll: boolean;
// scroll amount applied to each mouse wheel step
wheelStep: number;
// scroll amount applied when user is using gestures
touchScrollStep: number;
// sets border radius
borderRadius: string;
// sets border radius of the rail
railBorderRadius: string;
// set default point from which to start scrolling
scrollTo: number;
// auto scroll to bottom when content was added
autoScrollToBottom: boolean;
// if content will have height more than the value - slimscroll will be enabled
maxHeightBeforeEnable?: number;
}
const defaults: SlimScrollOptions = {
width: 'auto',
height: '100%',
size: '7px',
color: '#000',
position: 'right',
distance: '1px',
start: 'top',
opacity: 0.4,
transition: 0.3,
alwaysVisible: false,
disableFadeOut: false,
railVisible: false,
railColor: '#333',
railOpacity: 0.2,
railClass: 'slimScrollRail',
barClass: 'slimScrollBar',
wrapperClass: 'slimScrollDiv',
allowPageScroll: false,
wheelStep: 20,
touchScrollStep: 200,
borderRadius: '7px',
railBorderRadius: '7px',
scrollTo: 0,
autoScrollToBottom: false,
maxHeightBeforeEnable: undefined,
};
@Directive({
selector: '[slimScroll]'
})
export class DejaSlimScrollDirective implements OnInit, OnDestroy {
private _me: HTMLElement;
private _bar: HTMLDivElement;
private _rail: HTMLDivElement;
private _isOverPanel: boolean;
private _isOverBar: boolean;
private _isDragg: boolean;
private _touchDif: number;
private _barHeight: number;
private _percentScroll: number;
private _minBarHeight = 30;
private _releaseScroll = false;
private _options: SlimScrollOptions;
private _previousHeight: number;
private _queueHide: Subscription;
private _changesTracker: number;
private _barMouseDownPageY: number;
private _startBarTop: number;
private _renderer: Renderer2;
public constructor(
rendererFactory: RendererFactory2,
elementRef: ElementRef
) {
this._renderer = rendererFactory.createRenderer(null, null);
this._me = elementRef.nativeElement;
this._options = { ...defaults };
this.showBar = this.showBar.bind(this);
this.hideBar = this.hideBar.bind(this);
this.onWheel = this.onWheel.bind(this);
this.barMouseMove = this.barMouseMove.bind(this);
this.barMouseUp = this.barMouseUp.bind(this);
this.barMouseDown = this.barMouseDown.bind(this);
this.railMouseDown = this.railMouseDown.bind(this);
}
public ngOnInit(): void {
this.init();
}
public ngOnDestroy(): void {
if (this._changesTracker) {
clearInterval(this._changesTracker);
}
if (window.removeEventListener) {
window.removeEventListener('DOMMouseScroll', this.onWheel);
window.removeEventListener('mousewheel', this.onWheel);
} else {
document.removeEventListener('mousewheel', this.onWheel);
}
document.removeEventListener('mousemove', this.barMouseMove, false);
document.removeEventListener('mouseup', this.barMouseUp, false);
}
@HostListener('window:resize', ['$event'])
public onResize(): void {
this.init();
}
@Input()
public set width(value: string) {
this._options.width = value || defaults.width;
}
@Input()
public set height(value: string) {
this._options.height = value || defaults.height;
}
@Input()
public set size(value: string) {
this._options.size = value || defaults.size;
}
@Input()
public set color(value: string) {
this._options.color = value || defaults.color;
}
@Input()
public set position(value: string) {
this._options.position = value || defaults.position;
}
@Input()
public set distance(value: string) {
this._options.distance = value || defaults.distance;
}
@Input()
public set start(value: string) {
this._options.start = value || defaults.start;
}
@Input()
public set opacity(value: number) {
this._options.opacity = value || defaults.opacity;
}
@Input()
public set transition(value: number) {
this._options.transition = value || defaults.transition;
}
@Input()
public set alwaysVisible(value: boolean) {
this._options.alwaysVisible = value || defaults.alwaysVisible;
}
@Input()
public set disableFadeOut(value: boolean) {
this._options.disableFadeOut = value || defaults.disableFadeOut;
}
@Input()
public set railVisible(value: boolean) {
this._options.railVisible = value || defaults.railVisible;
}
@Input()
public set railColor(value: string) {
this._options.railColor = value || defaults.railColor;
}
@Input()
public set railOpacity(value: number) {
this._options.railOpacity = value || defaults.railOpacity;
}
@Input()
public set railClass(value: string) {
this._options.railClass = value || defaults.railClass;
}
@Input()
public set barClass(value: string) {
this._options.barClass = value || defaults.barClass;
}
@Input()
public set wrapperClass(value: string) {
this._options.wrapperClass = value || defaults.wrapperClass;
}
@Input()
public set allowPageScroll(value: boolean) {
this._options.allowPageScroll = value || defaults.allowPageScroll;
}
@Input()
public set wheelStep(value: number) {
this._options.wheelStep = value || defaults.wheelStep;
}
@Input()
public set touchScrollStep(value: number) {
this._options.touchScrollStep = value || defaults.touchScrollStep;
}
@Input()
public set borderRadius(value: string) {
this._options.borderRadius = value || defaults.borderRadius;
}
@Input()
public set railBorderRadius(value: string) {
this._options.railBorderRadius = value || defaults.railBorderRadius;
}
@Input()
public set scrollTo(value: number) {
this._options.scrollTo = value || defaults.scrollTo;
}
@Input()
public set autoScrollToBottom(value: boolean) {
this._options.autoScrollToBottom = value || defaults.autoScrollToBottom;
}
@Input()
public set maxHeightBeforeEnable(value: number) {
this._options.maxHeightBeforeEnable = value || defaults.maxHeightBeforeEnable;
}
private init(): void {
// ensure we are not binding it again
if (this._bar && this._rail) {
this.refresh();
} else {
this.setup();
}
}
private trackPanelHeightChanged = (): void => {
this._previousHeight = this._me.scrollHeight;
this._changesTracker = window.setInterval(() => {
if (this._previousHeight !== this._me.scrollHeight) {
this._previousHeight = this._me.scrollHeight;
this.init();
if (this._options.autoScrollToBottom) {
this._renderer.setStyle(this._bar, 'top', `${this._me.offsetHeight - this._bar.offsetHeight}px`);
this.scrollContent(0, true);
}
}
}, 1000);
}
private hasParentClass(e: HTMLElement, className: string): boolean {
if (!e) {
return false;
}
if (e.classList.contains(this._options.wrapperClass)) {
return true;
}
return this.hasParentClass(e.parentElement, className);
}
private onWheel(e: MouseWheelEvent): void {
// use mouse wheel only when mouse is over
if (!this._isOverPanel) {
return;
}
let delta = 0;
if (e.wheelDelta) {
delta = -e.wheelDelta / 120;
}
if (e.detail) {
delta = e.detail / 3;
}
const target = (e.target || e.currentTarget || e.relatedTarget) as HTMLElement;
if (this.hasParentClass(target, this._options.wrapperClass)) {
// scroll content
this.scrollContent(delta, true);
}
// stop window scroll
if (e.preventDefault && !this._releaseScroll) {
e.preventDefault();
}
if (!this._releaseScroll) {
e.returnValue = false;
}
}
private attachWheel(target: Window): void {
if (window.addEventListener) {
target.addEventListener('DOMMouseScroll', this.onWheel, false);
target.addEventListener('mousewheel', this.onWheel, false);
} else {
document.addEventListener('mousewheel', this.onWheel, false);
}
}
private showBar(): void {
// recalculate bar height
this.getBarHeight();
if (this._queueHide) {
this._queueHide.unsubscribe();
this._queueHide = null;
}
// when bar reached top or bottom
// tslint:disable-next-line:no-bitwise
if (this._percentScroll === ~~this._percentScroll) {
// release wheel
this._releaseScroll = this._options.allowPageScroll;
} else {
this._releaseScroll = false;
}
// show only when required
if (this._barHeight >= this._me.offsetHeight) {
// allow window scroll
this._releaseScroll = true;
return;
}
this._renderer.setStyle(this._bar, 'opacity', this._options.opacity.toString());
this._renderer.setStyle(this._rail, 'opacity', this._options.railOpacity.toString());
}
private hideBar(): void {
// only hide when options allow it
if (
!this._options.alwaysVisible
&& !(this._options.disableFadeOut && this._isOverPanel)
&& !this._isOverBar
&& !this._isDragg
) {
this._queueHide = observableTimer(1000).pipe(
first(),
filter(() => !this._queueHide))
.subscribe(() => {
this._renderer.setStyle(this._bar, 'opacity', '0');
this._renderer.setStyle(this._rail, 'opacity', '0');
});
}
}
public scrollContent(y: number, isWheel: boolean, isJump = false) {
this._releaseScroll = false;
let delta: number = y;
const maxTop: number = this._me.offsetHeight - this._bar.offsetHeight;
if (isWheel) {
// move bar with mouse wheel
delta = parseInt(this._bar.style.top, 10) + y * this._options.wheelStep / 100 * this._bar.offsetHeight;
// move bar, make sure it doesn't go out
delta = Math.min(Math.max(delta, 0), maxTop);
// if scrolling down, make sure a fractional change to the
// scroll position isn't rounded away when the scrollbar's CSS is set
// this flooring of delta would happened automatically when
// bar.css is set below, but we floor here for clarity
delta = (y > 0) ? Math.ceil(delta) : Math.floor(delta);
// scroll the scrollbar
this._renderer.setStyle(this._bar, 'top', `${delta}px`);
}
// calculate actual scroll amount
this._percentScroll = parseInt(this._bar.style.top, 10) / (this._me.offsetHeight - this._bar.offsetHeight);
delta = this._percentScroll * (this._me.scrollHeight - this._me.offsetHeight);
if (isJump) {
delta = y;
let offsetTop = delta / this._me.scrollHeight * this._me.offsetHeight;
offsetTop = Math.min(Math.max(offsetTop, 0), maxTop);
this._renderer.setStyle(this._bar, 'top', `${offsetTop}px`);
}
// scroll content
this._me.scrollTop = delta;
// ensure bar is visible
this.showBar();
// trigger hide when scroll is stopped
this.hideBar();
}
private getBarHeight(): void {
// calculate scrollbar height and make sure it is not too small
this._barHeight = Math.max(this._me.offsetHeight / (this._me.scrollHeight === 0 ? 1 : this._me.scrollHeight) * this._me.offsetHeight, this._minBarHeight);
this._renderer.setStyle(this._bar, 'height', `${this._barHeight}px`);
// hide scrollbar if content is not long enough
const display = this._barHeight === this._me.offsetHeight ? 'none' : 'block';
this._renderer.setStyle(this._bar, 'display', display);
}
private refresh(): void {
this.getBarHeight();
// Pass height: auto to an existing slimscroll object to force a resize after contents have changed
if ('height' in this._options && this._options.height === 'auto') {
this._renderer.setStyle(this._me.parentElement, 'height', 'auto');
this._renderer.setStyle(this._me, 'height', 'auto');
const height = this._me.parentElement.clientHeight;
this._renderer.setStyle(this._me.parentElement, 'height', `${height}px`);
this._renderer.setStyle(this._me, 'height', `${height}px`);
} else if ('height' in this._options) {
const h = this._options.height;
this._renderer.setStyle(this._me.parentElement, 'height', h);
this._renderer.setStyle(this._me, 'height', h);
}
}
private railMouseDown(event: MouseEvent) {
const clientRects = this._rail.getBoundingClientRect();
const elementOffsetTop = clientRects.top + window.scrollY;
const moveTo = event.pageY - elementOffsetTop - (this._barHeight / 2);
const scrollTo = this._me.scrollHeight * (moveTo / clientRects.height);
this._renderer.setStyle(this._bar, 'top', `${(moveTo >= 0 ? moveTo : 0)}px`);
this.scrollContent(scrollTo, false, true);
}
private barMouseMove(event: MouseEvent) {
const currTop = this._startBarTop + event.pageY - this._barMouseDownPageY;
this._renderer.setStyle(this._bar, 'top', `${(currTop >= 0 ? currTop : 0)}px`);
const position = this._bar.getClientRects()[0];
if (position) {
this.scrollContent(0, position.top > 0);
}
}
private barMouseUp() {
this._isDragg = false;
// return normal text selection
const body = document.body;
this._renderer.setStyle(body, '-webkit-user-select', 'initial');
this._renderer.setStyle(body, '-moz-user-select', 'initial');
this._renderer.setStyle(body, '-ms-user-select', 'initial');
this._renderer.setStyle(body, 'user-select', 'initial');
this.hideBar();
document.removeEventListener('mousemove', this.barMouseMove, false);
document.removeEventListener('mouseup', this.barMouseUp, false);
}
private barMouseDown(e: MouseEvent) {
this._isDragg = true;
// disable text selection
const body = document.body;
this._renderer.setStyle(body, '-webkit-user-select', 'none');
this._renderer.setStyle(body, '-moz-user-select', 'none');
this._renderer.setStyle(body, '-ms-user-select', 'none');
this._renderer.setStyle(body, 'user-select', 'none');
this._barMouseDownPageY = e.pageY;
this._startBarTop = parseFloat(this._bar.style.top);
document.addEventListener('mousemove', this.barMouseMove, false);
document.addEventListener('mouseup', this.barMouseUp, false);
return false;
}
private setup(): void {
// check whether it changes in content
this.trackPanelHeightChanged();
if (this._options.maxHeightBeforeEnable && this._me.scrollHeight <= this._options.maxHeightBeforeEnable) {
return;
}
// wrap content
const wrapper = document.createElement('div');
this._renderer.addClass(wrapper, this._options.wrapperClass);
this._renderer.setStyle(wrapper, 'position', 'relative');
this._renderer.setStyle(wrapper, 'overflow', 'hidden');
this._renderer.setStyle(wrapper, 'width', this._options.width);
this._renderer.setStyle(wrapper, 'height', this._options.height);
// update style for the div
this._renderer.setStyle(this._me, 'overflow', 'hidden');
this._renderer.setStyle(this._me, 'width', this._options.width);
this._renderer.setStyle(this._me, 'height', this._options.height);
// create scrollbar rail
this._rail = document.createElement('div');
this._renderer.addClass(this._rail, this._options.railClass);
this._renderer.setStyle(this._rail, 'width', this._options.size);
this._renderer.setStyle(this._rail, 'height', '100%');
this._renderer.setStyle(this._rail, 'position', 'absolute');
this._renderer.setStyle(this._rail, 'top', '0');
this._renderer.setStyle(this._rail, 'display', this._options.railVisible ? 'block' : 'none');
this._renderer.setStyle(this._rail, 'border-radius', this._options.railBorderRadius);
this._renderer.setStyle(this._rail, 'background', this._options.railColor);
this._renderer.setStyle(this._rail, 'opacity', this._options.railOpacity.toString());
this._renderer.setStyle(this._rail, 'transition', `opacity ${this._options.transition}s`);
this._renderer.setStyle(this._rail, 'z-index', '90');
// create scrollbar
this._bar = document.createElement('div');
this._renderer.addClass(this._bar, this._options.barClass);
this._renderer.setStyle(this._bar, 'background', this._options.color);
this._renderer.setStyle(this._bar, 'width', this._options.size);
this._renderer.setStyle(this._bar, 'position', 'absolute');
this._renderer.setStyle(this._bar, 'top', '0');
this._renderer.setStyle(this._bar, 'opacity', this._options.opacity.toString());
this._renderer.setStyle(this._bar, 'transition', `opacity ${this._options.transition}s`);
this._renderer.setStyle(this._bar, 'display', this._options.alwaysVisible ? 'block' : 'none');
this._renderer.setStyle(this._bar, 'border-radius', this._options.borderRadius);
this._renderer.setStyle(this._bar, 'webkit-border-radius', this._options.borderRadius);
this._renderer.setStyle(this._bar, 'moz-border-radius', this._options.borderRadius);
this._renderer.setStyle(this._bar, 'z-index', '99');
// set position
if (this._options.position === 'right') {
this._renderer.setStyle(this._rail, 'right', this._options.distance);
this._renderer.setStyle(this._bar, 'right', this._options.distance);
} else {
this._renderer.setStyle(this._rail, 'left', this._options.distance);
this._renderer.setStyle(this._bar, 'left', this._options.distance);
}
// wrap it
this._me.parentElement.insertBefore(wrapper, this._me);
wrapper.appendChild(this._me);
if (this._options.scrollTo > 0) {
// jump to a static point
this.scrollContent(this._options.scrollTo, false, true);
}
// append to parent div
this._me.parentElement.appendChild(this._bar);
this._me.parentElement.appendChild(this._rail);
this._bar.addEventListener('mousedown', this.barMouseDown, false);
// on rail over
this._rail.addEventListener('mouseenter', this.showBar, false);
this._rail.addEventListener('mouseleave', this.hideBar, false);
this._rail.addEventListener('mousedown', this.railMouseDown, false);
// on bar over
this._bar.addEventListener('mouseenter', () => this._isOverBar = true, false);
this._bar.addEventListener('mouseleave', () => this._isOverBar = false, false);
// show on parent mouseover
this._me.addEventListener('mouseenter', () => {
this._isOverPanel = true;
this.showBar();
this.hideBar();
}, false);
this._me.addEventListener('mouseleave', () => {
this._isOverPanel = false;
this.hideBar();
}, false);
// support for mobile
this._me.addEventListener('touchstart', e => {
if (e.touches.length) {
// record where touch started
this._touchDif = e.touches[0].pageY;
}
}, false);
this._me.addEventListener('touchmove', e => {
// prevent scrolling the page if necessary
if (!this._releaseScroll) {
e.preventDefault();
}
if (e.touches.length) {
// see how far user swiped
const diff = (this._touchDif - e.touches[0].pageY) / this._options.touchScrollStep;
// scroll content
this.scrollContent(diff, true);
this._touchDif = e.touches[0].pageY;
}
}, false);
// set up initial height
this.getBarHeight();
// hide bar on init if alwaysVisible equal false
this.hideBar();
// check start position
if (this._options.start === 'bottom') {
// scroll content to bottom
this._renderer.setStyle(this._bar, 'top', `${this._me.offsetHeight - this._bar.offsetHeight}px`);
this.scrollContent(0, true);
}
// attach scroll events
this.attachWheel(window);
}
}
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