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import {Component, OnChanges, AfterViewChecked, ViewChild, ElementRef, Input, Output, SimpleChanges, EventEmitter} from "@angular/core";
import {WindowRef} from "../../services/window.service";
@Component({
selector: 'multiline-ellipsis',
templateUrl: 'multiline-ellipsis.component.html',
styleUrls: ['multiline-ellipsis.component.less']
})
export class MultilineEllipsisComponent implements OnChanges, AfterViewChecked {
@Input() public lines: number;
@Input() public lineHeight: string;
@Input() public className: string;
@Output() public hasEllipsisChanged: EventEmitter<boolean>;
@ViewChild('multilineEllipsisContainer') public elmContainer: ElementRef;
@ViewChild('multilineEllipsisContent') public elmContent: ElementRef;
public stylesContainer: {[key: string]: string};
public stylesContent: {[key: string]: string};
public stylesDots: {[key: string]: string};
private hasEllipsis: boolean;
public constructor(private windowRef: WindowRef) {
this.hasEllipsisChanged = new EventEmitter<boolean>();
}
public ngOnChanges(changes: SimpleChanges) {
this.prepareStyles()
}
public ngAfterViewChecked() {
const hasEllipsis = (this.elmContainer.nativeElement.offsetHeight < this.elmContent.nativeElement.offsetHeight);
if (hasEllipsis !== this.hasEllipsis) {
this.hasEllipsis = hasEllipsis;
this.hasEllipsisChanged.emit(this.hasEllipsis);
}
}
private prepareStyles() {
const lineHeight = this.lineHeight || this.getLineHeight();
this.stylesContainer = {
'max-height': `calc(${this.lines} * ${lineHeight})`
};
this.stylesContent = {
'max-height': `calc(${this.lines + 1} * ${lineHeight})`
};
this.stylesDots = {
'top': `calc(${2 * this.lines} * ${lineHeight} - 100%)`
};
}
private getLineHeight() {
return this.windowRef.nativeWindow.getComputedStyle(this.elmContainer.nativeElement)['line-height'];
}
}
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