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/**
* Created by rc2122 on 6/6/2017.
*/
import {Component, Input, ElementRef, Renderer, SimpleChanges} from "@angular/core";
@Component({
selector: 'loader',
templateUrl: './loader.component.html',
styleUrls: ['./loader.component.less']
})
export class LoaderComponent {
@Input() display:boolean;
@Input() size:string;// small || medium || large
@Input() elementSelector:string; // required if is relative true
@Input() relative:boolean;
interval;
constructor (private el: ElementRef, private renderer: Renderer){
}
ngOnInit() {
if (this.elementSelector) {
let elemParent = angular.element(this.elementSelector);
let positionStyle:string = elemParent.css('position');
this.setStyle(positionStyle);
}
if (this.relative === true) {
let positionStyle:string = this.el.nativeElement.parentElement.style.position;
this.setStyle(positionStyle);
}
if (!this.size) {
this.size = 'large';
}
}
ngOnDestroy(){
clearInterval(this.interval);
}
calculateSizesForFixPosition = (positionStyle:string):void => {
// This is problematic, I do not want to change the parent position.
// set the loader on all the screen
let parentLeft = this.el.nativeElement.parentElement.offsetLeft;
let parentTop = this.el.nativeElement.parentElement.offsetTop;
let parentWidth = this.el.nativeElement.parentElement.offsetWidth;
let parentHeight = this.el.nativeElement.parentElement.offsetHeight;
this.renderer.setElementStyle(this.el.nativeElement, 'position', positionStyle);
this.renderer.setElementStyle(this.el.nativeElement, 'top', parentTop);
this.renderer.setElementStyle(this.el.nativeElement, 'left', parentLeft);
this.renderer.setElementStyle(this.el.nativeElement, 'width', parentWidth);
this.renderer.setElementStyle(this.el.nativeElement, 'height', parentHeight);
};
setStyle = (positionStyle:string):void => {
switch (positionStyle) {
case 'absolute':
case 'fixed':
// The parent size is not set yet, still loading, so need to use interval to update the size.
this.interval = window.setInterval(()=> {
this.calculateSizesForFixPosition(positionStyle);
}, 2000);
break;
default:
// Can change the parent position to relative without causing style issues.
this.renderer.setElementStyle(this.el.nativeElement.parentElement,'position', 'relative');
break;
}
};
ngOnChanges(changes: SimpleChanges) {
if(changes.display){
this.changeLoaderDisplay(false);
if ( this.display ) {
window.setTimeout(():void => {
this.changeLoaderDisplay(true);
}, 500);
} else {
window.setTimeout(():void => {
this.changeLoaderDisplay(false);
}, 0);
}
}
}
changeLoaderDisplay = (display:boolean):void => {
this.renderer.setElementStyle(this.el.nativeElement, 'display', display ? 'block' : 'none');
}
}
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