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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
*/
import { AfterViewInit, Component, ElementRef, EventEmitter, HostListener, Input, OnDestroy, OnInit, Output } from '@angular/core';
import { from as observableFrom, Subject, Subscription, timer as observableTimer } from 'rxjs';
import { debounce, delay, first, tap } from 'rxjs/operators';
interface IAnimation {
before: CSSStyleDeclaration;
after: CSSStyleDeclaration;
delay?: number;
duration: number;
easing: string;
}
@Component({
selector: 'deja-snackbar',
styles: [require('./snackbar.component.scss')],
template: `<ng-content></ng-content>`,
})
export class DejaSnackbarComponent implements OnInit, AfterViewInit, OnDestroy {
/**
* all snackbar instances
*/
private static instances: DejaSnackbarComponent[];
/**
* inner container
*/
// @ViewChild('container') public host;
/**
* specify delay for the enter animation
*/
@Input() public delay = 0;
/**
* specify lifetime of the snackbar on the screen
*/
@Input() public duration = 0;
/**
* set a container for the snackbar instead of default behavior (viewport)
*/
@Input() public outerContainerElement: HTMLElement;
/**
* callback used to negate the boolean responsible for the presence of the snackbar on the dom (see demo)
*/
@Output() public onAnimationDone: EventEmitter<any> = new EventEmitter();
/**
* inner container element, represent the snackbar since the host has no height width and a position relative to it's html declaration
*/
private host: HTMLElement;
/**
* height of the inner container element
*/
private height: number;
/**
* vertical space between snackbar
*/
private marginTop = 6;
/**
* snackbar creation timestamp, used for calculation, forthe adapt animation
*/
private timestamp: number = +new Date();
/**
* enter animation duration
*/
private enterAnimationDuration = 350;
/**
* leave animation duration
*/
private leaveAnimationDuration = 175;
/**
* adapt animation duration
*/
private adaptAnimationDuration = 225;
/**
* string representation of the alignment, used for statements and initial final position
*/
private anchor: string;
/**
* object representation of the alignment, used to filter incompatible alignments and build the string representation
*/
private alignents: {
[prop: string]: boolean;
top: boolean;
right: boolean;
bottom: boolean;
left: boolean;
};
private animate$ = new Subject<IAnimation>();
private animate$sub: Subscription;
/**
* alignents setter
*/
@Input() public set alignment(value: string) {
this.alignents = {
bottom: false,
left: false,
right: false,
top: false,
};
// set alignents
if (value) {
value
.split(/\s+/g)
.map((align: string) => this.alignents[align] = true);
}
// filter incompatible alignments
this.alignents.bottom = this.alignents.top && this.alignents.bottom ? false : this.alignents.bottom;
this.alignents.left = this.alignents.right && this.alignents.left ? false : this.alignents.left;
}
/**
* Creates an instance of DejaSnackbarComponent.
*
* @param elementRef
* @param renderer
*/
constructor(private elementRef: ElementRef) {
if (!DejaSnackbarComponent.instances) {
DejaSnackbarComponent.instances = [];
}
DejaSnackbarComponent.instances.push(this);
const applyParams = (styles: CSSStyleDeclaration) => {
Object.keys(styles)
.forEach((key) => {
(<any>this.host.style)[key] = (<any>styles)[key];
});
};
this.animate$sub = observableFrom(this.animate$).pipe(
tap((animation) => applyParams(animation.before)),
delay(1),
tap((animation) => {
this.host.style.transitionDuration = `${animation.duration}ms`;
this.host.style.transitionTimingFunction = animation.easing;
this.host.style.transitionProperty = Object.keys(animation.before).join(',');
}),
debounce((animation) => observableTimer(animation.delay || 1)),
tap((animation) => applyParams(animation.after)),
debounce((animation) => observableTimer(animation.duration)))
.subscribe(() => {
this.host.style.transitionDuration = '';
this.host.style.transitionTimingFunction = '';
this.host.style.transitionProperty = '';
});
}
/**
* used to recalculate the position of the snackbar on the X axis when resizing / changing from landscape to portrait and vice versa
*
* @param event
*/
@HostListener('window:resize', ['$event']) public onResize() {
this.setNewWidth();
}
/**
* onInit hook
*/
public ngOnInit(): void {
// Choose animation depending on alignment
const anchors = [] as string[];
Object.keys(this.alignents).forEach((key) => {
if (this.alignents[key]) {
anchors.push(key);
}
});
anchors.sort((x, y) => x > y ? 1 : -1);
const anchor = anchors.reduce((acc, curr) => {
if (acc === '') {
acc += curr;
} else {
acc += `-${curr}`;
}
return acc;
}, '');
this.anchor = anchor;
}
/**
* afterviewInit hook
*/
public ngAfterViewInit(): void {
this.host = this.elementRef.nativeElement as HTMLElement;
if (!this.outerContainerElement) {
// Set default outer container if none specified
this.outerContainerElement = this.host.ownerDocument.body as HTMLElement;
} else {
// Otherwise, set inner container position to absolute for correct placement of snackbars
this.host.classList.add('absolute');
}
this.height = this.host.getBoundingClientRect().height;
this.setPosition();
this.launchEnterAnimation();
// if a duration has been been specified, launch the 'leave' animation after snackbar's lifetime flow, then emit amination done
observableTimer(this.duration + this.delay).pipe(
first(),
tap(() => {
if (!!this.duration) {
this.launchLeaveAnimation();
}
}),
delay(this.leaveAnimationDuration))
.subscribe(() => this.onAnimationDone.emit());
}
/**
* onDestroy hook
*/
public ngOnDestroy(): void {
// check if snackbars have to move (if they were created after the one deleted)
if (!!DejaSnackbarComponent.instances.length) {
DejaSnackbarComponent.instances
.filter((instance: DejaSnackbarComponent) => this.outerContainerElement === instance.outerContainerElement)
.filter((instance: DejaSnackbarComponent) => this.anchor === instance.anchor)
.forEach((instance) => {
if (instance.timestamp > this.timestamp) {
instance.launchAdaptAnimation(this.height);
}
});
}
// remove the soon to be destroyed snackbar from the instances array
DejaSnackbarComponent.instances = DejaSnackbarComponent.instances
.filter((instance: DejaSnackbarComponent) => this !== instance);
this.animate$sub.unsubscribe();
}
/**
* emit animation done
*
* @param event
*/
protected animationDone(event: Event): void {
this.onAnimationDone.emit(event);
}
protected increaseElevation() {
const zIndex = window.getComputedStyle(this.host).zIndex;
this.host.style.zIndex = (+zIndex + 1).toString();
}
protected decreaseElevation() {
const zIndex = window.getComputedStyle(this.host).zIndex;
this.host.style.zIndex = (+zIndex - 1).toString();
}
/**
* compute cumulated height of all snackbars, precedent instance height, width and height of the innerContainer
*
* @return cumulated height of all snackbars, precedent instance height, width and height of the innerContainer
*/
private computePosition(): any {
// Inner container
const innerContainerElementBounds = this.host.getBoundingClientRect();
const innerContainerWidth = innerContainerElementBounds.width;
const innerContainerHeight = innerContainerElementBounds.height;
// Instances sharing the same outer container and the same anchor
const instancesInSameZone = DejaSnackbarComponent.instances
.filter((instance: DejaSnackbarComponent) => this.outerContainerElement === instance.outerContainerElement)
.filter((instance: DejaSnackbarComponent) => this.anchor === instance.anchor)
.filter((instance: DejaSnackbarComponent) => this !== instance);
let precedentInstanceHeight = 0;
if (!!instancesInSameZone) {
const precedentInstance = instancesInSameZone[instancesInSameZone.length - 1];
if (!!precedentInstance) {
const innerContainerElement = precedentInstance.elementRef.nativeElement as HTMLElement;
precedentInstanceHeight = innerContainerElement.getBoundingClientRect().height;
}
}
// computed height of inner containers, sharing the same outer container and the same anchor
const computedHeight = instancesInSameZone
.map((instance: DejaSnackbarComponent) => {
const innerContainerElement = instance.elementRef.nativeElement as HTMLElement;
return innerContainerElement.getBoundingClientRect().height;
})
.reduce((acc, curr) => {
acc += curr + this.marginTop;
return acc;
}, 0);
return {
innerContainerWidth,
innerContainerHeight,
precedentInstanceHeight,
computedHeight,
};
}
/**
* set the final position of the snackbar
*/
private setPosition(): void {
const { innerContainerWidth, innerContainerHeight, computedHeight } = this.computePosition();
if (this.anchor === 'left') {
this.host.style.left = `${2}%`;
this.host.style.bottom = `calc(${33}% + ${computedHeight}px)`;
}
if (this.anchor === 'right') {
this.host.style.left = `calc(${98}% - ${innerContainerWidth}px)`;
this.host.style.bottom = `calc(${33}% + ${computedHeight}px)`;
}
if (this.anchor === 'top') {
this.host.style.left = `calc(${50}% - ${innerContainerWidth / 2}px )`;
this.host.style.bottom = `calc(${92}% - ${innerContainerHeight}px)`;
}
if (this.anchor === 'bottom') {
this.host.style.left = `calc(${50}% - ${innerContainerWidth / 2}px )`;
this.host.style.bottom = `calc(${2}% + ${computedHeight}px)`;
}
if (this.anchor === 'bottom-left') {
this.host.style.left = `${2}%`;
this.host.style.bottom = `calc(${2}% + ${computedHeight}px)`;
}
if (this.anchor === 'bottom-right') {
this.host.style.left = `calc(${98}% - ${innerContainerWidth}px)`;
this.host.style.bottom = `calc(${2}% + ${computedHeight}px)`;
}
if (this.anchor === 'left-top') {
this.host.style.left = `${2}%`;
this.host.style.bottom = `calc(${92}% - ${innerContainerHeight}px - ${computedHeight}px)`;
}
if (this.anchor === 'right-top') {
this.host.style.left = `calc(${98}% - ${innerContainerWidth}px)`;
this.host.style.bottom = `calc(${92}% - ${innerContainerHeight}px - ${computedHeight}px)`;
}
}
/**
* recalculate X position for the snackbar (see @HostListener)
*/
private setNewWidth(): void {
const { innerContainerWidth } = this.computePosition();
if (this.anchor === 'top' || this.anchor === 'bottom') {
this.elementRef.nativeElement.style.left = `calc(${50}% - ${innerContainerWidth / 2}px )`;
}
}
/**
* launch adapt animation (snackbar disposal trigger this method)
* important note:
* matrix retrieval is used instead of translate Y because using translateY in enter and adapt animation seems
* to cause unexpected behavior (understand bug)
* there is also a known bug, if you close a snackbar which share anchor and container with an other one created at the same moment
* adaptation of the position will not be performed correctly, see demo for more information about how to avoid this behavior
*
* @param height
*/
private launchAdaptAnimation(height: number) {
let direction = 1;
if (this.alignents.top) {
direction = -1;
}
const transform = window.getComputedStyle(this.host).transform;
const sixth = parseFloat(transform
.split(',')
.slice(-1)
.pop());
this.animate$.next({
before: {
transform: `${transform}`,
},
after: {
transform: `matrix(1,0,0,1,0,${sixth + ((height + this.marginTop) * direction)})`,
},
duration: this.adaptAnimationDuration,
easing: 'ease',
} as IAnimation);
}
/**
* launch enter animation (snackbar instanciation trigger this method)
*/
private launchEnterAnimation() {
let direction = -1;
if (this.alignents.top) {
direction = 1;
}
this.animate$.next({
before: {
opacity: '0',
transform: `translateY(${direction * 200}%)`,
},
after: {
opacity: '1',
transform: `translateY(0)`,
},
delay: this.delay,
duration: this.enterAnimationDuration,
easing: 'ease',
} as IAnimation);
}
/**
* launch leave animation (snackbar lifetime flow trigger this animation)
*/
private launchLeaveAnimation() {
this.animate$.next({
before: {
opacity: '1',
},
after: {
opacity: '0',
},
duration: this.leaveAnimationDuration,
easing: 'ease',
} as IAnimation);
}
}
|