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Merge pull request #13 from nischi/master

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Avoid rerendering
This commit is contained in:
Lorenzo Iovino 2017-08-24 09:42:42 +02:00 • committed by GitHub
commit 34942e0852
1 changed files with 52 additions and 29 deletions
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81
src/ng2fittext.directive.ts
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@ -13,20 +13,22 @@ export class Ng2FittextDirective implements AfterViewInit, OnInit, OnChanges, Af
@Input('minFontSize') minFontSize = 7; @Input('minFontSize') minFontSize = 7;
@Input('modelToWatch') modelToWatch: any; @Input('modelToWatch') modelToWatch: any;
private maxFontSize: number = 1000; private maxFontSize: number = 1000;
private fontSize: number = 0; private fontSize: number = 1000;
private speed: number = 1.05; private speed: number = 1.05;
private done: boolean = false;
constructor(public el: ElementRef, public renderer: Renderer) { constructor(public el: ElementRef, public renderer: Renderer) { }
}
setFontSize(fontSize) { setFontSize(fontSize) {
if (fontSize < this.minFontSize) { if (this.isVisible() && this.done === false) {
// force that font size will never be lower than minimal allowed font size if (fontSize < this.minFontSize) {
fontSize = this.minFontSize; // force that font size will never be lower than minimal allowed font size
} fontSize = this.minFontSize;
}
this.fontSize = fontSize; this.fontSize = fontSize;
return this.el.nativeElement.style.setProperty('font-size', (fontSize).toString() + 'px'); return this.el.nativeElement.style.setProperty('font-size', (fontSize).toString() + 'px');
}
} }
calculateFontSize(fontSize, speed) { calculateFontSize(fontSize, speed) {
@ -35,7 +37,6 @@ export class Ng2FittextDirective implements AfterViewInit, OnInit, OnChanges, Af
} }
checkOverflow(parent: any, children: any) { checkOverflow(parent: any, children: any) {
let overflowX = children.scrollWidth - parent.clientWidth; let overflowX = children.scrollWidth - parent.clientWidth;
let overflowY = children.clientHeight - parent.clientHeight; let overflowY = children.clientHeight - parent.clientHeight;
return (overflowX > 1 || overflowY > 1); return (overflowX > 1 || overflowY > 1);
@ -43,11 +44,12 @@ export class Ng2FittextDirective implements AfterViewInit, OnInit, OnChanges, Af
@HostListener('window:resize', ['$event']) @HostListener('window:resize', ['$event'])
onResize() { onResize() {
this.done = false;
if (this.activateOnResize && this.fittext) { if (this.activateOnResize && this.fittext) {
if (this.activateOnInputEvents && this.fittext) { if (this.activateOnInputEvents && this.fittext) {
this.setFontSize(this.container ? this.container.clientHeight : this.el.nativeElement.parentElement.clientHeight); this.setFontSize(this.getStartFontSizeFromHeight());
} else { } else {
this.setFontSize(this.container ? this.container.clientWidth : this.el.nativeElement.parentElement.clientWidth); this.setFontSize(this.getStartFontSizeFromWeight());
} }
this.ngAfterViewInit(); this.ngAfterViewInit();
@ -56,15 +58,17 @@ export class Ng2FittextDirective implements AfterViewInit, OnInit, OnChanges, Af
@HostListener('input', ['$event']) @HostListener('input', ['$event'])
onInputEvents() { onInputEvents() {
this.done = false;
if (this.activateOnInputEvents && this.fittext) { if (this.activateOnInputEvents && this.fittext) {
this.setFontSize(this.container ? this.container.clientHeight : this.el.nativeElement.parentElement.clientHeight); this.setFontSize(this.getStartFontSizeFromHeight());
this.ngAfterViewInit(); this.ngAfterViewInit();
} }
} }
ngOnInit() { ngOnInit() {
this.done = false;
if (this.useMaxFontSize) { if (this.useMaxFontSize) {
this.maxFontSize = parseInt(window.getComputedStyle(this.container ? this.container : this.el.nativeElement.parentElement).fontSize, null); this.maxFontSize = parseInt(this.getComputetStyle().fontSize, null);
} }
if (this.fittext) { if (this.fittext) {
@ -75,21 +79,24 @@ export class Ng2FittextDirective implements AfterViewInit, OnInit, OnChanges, Af
} }
ngAfterViewInit() { ngAfterViewInit() {
if (this.fittext) { if (this.isVisible() && this.done === false) {
let overflow = this.container ? this.checkOverflow(this.container, this.el.nativeElement) if (this.fittext) {
: this.checkOverflow(this.el.nativeElement.parentElement, this.el.nativeElement); let overflow = this.container ? this.checkOverflow(this.container, this.el.nativeElement)
if (overflow) { : this.checkOverflow(this.el.nativeElement.parentElement, this.el.nativeElement);
if (this.fontSize > this.minFontSize) { if (overflow) {
// iterate only until font size is bigger than minimal value if (this.fontSize > this.minFontSize) {
this.setFontSize(this.calculateFontSize(this.fontSize, this.speed)); // iterate only until font size is bigger than minimal value
this.ngAfterViewInit(); this.setFontSize(this.calculateFontSize(this.fontSize, this.speed));
} this.ngAfterViewInit();
} else {
if (this.useMaxFontSize) {
if (this.fontSize > this.maxFontSize) {
this.maxFontSize = parseInt(window.getComputedStyle(this.container ? this.container : this.el.nativeElement.parentElement).fontSize, null);
this.setFontSize(this.maxFontSize);
} }
} else {
if (this.useMaxFontSize) {
if (this.fontSize > this.maxFontSize) {
this.maxFontSize = parseInt(this.getComputetStyle().fontSize, null);
this.setFontSize(this.maxFontSize);
}
}
this.done = true;
} }
} }
} }
@ -104,8 +111,24 @@ export class Ng2FittextDirective implements AfterViewInit, OnInit, OnChanges, Af
ngAfterViewChecked() { ngAfterViewChecked() {
if (this.fontSize > this.minFontSize) { if (this.fontSize > this.minFontSize) {
this.setFontSize(this.container ? this.container.clientHeight : this.el.nativeElement.parentElement.clientHeight); this.setFontSize(this.getStartFontSizeFromHeight());
this.ngAfterViewInit(); this.ngAfterViewInit();
} }
} }
private getComputetStyle(): CSSStyleDeclaration {
return window.getComputedStyle(this.container ? this.container : this.el.nativeElement.parentElement);
}
private getStartFontSizeFromHeight(): number {
return this.container ? this.container.clientHeight : this.el.nativeElement.parentElement.clientHeight;
}
private getStartFontSizeFromWeight(): number {
return this.container ? this.container.clientWidth : this.el.nativeElement.parentElement.clientWidth;
}
private isVisible(): boolean {
return this.getStartFontSizeFromHeight() > 0;
}
} }