loke/ng2-fittext
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Avoid rerendering #13

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nischi merged 3 commits from master into master 2017-08-24 07:42:42 +00:00
Conversation 1 Commits 3 Files changed 1 +52 -29
1 changed files with 52 additions and 29 deletions
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43
src/ng2fittext.directive.ts
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@ -13,13 +13,14 @@ export class Ng2FittextDirective implements AfterViewInit, OnInit, OnChanges, Af
@Input('minFontSize') minFontSize = 7;
@Input('modelToWatch') modelToWatch: any;
private maxFontSize: number = 1000;
private fontSize: number = 0;
private fontSize: number = 1000;
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) {
if (this.isVisible() && this.done === false) {
if (fontSize < this.minFontSize) {
// force that font size will never be lower than minimal allowed font size
fontSize = this.minFontSize;
@ -28,6 +29,7 @@ export class Ng2FittextDirective implements AfterViewInit, OnInit, OnChanges, Af
this.fontSize = fontSize;
return this.el.nativeElement.style.setProperty('font-size', (fontSize).toString() + 'px');
}
}
calculateFontSize(fontSize, speed) {
// TODO Do with Gauss
@ -35,7 +37,6 @@ export class Ng2FittextDirective implements AfterViewInit, OnInit, OnChanges, Af
}
checkOverflow(parent: any, children: any) {
let overflowX = children.scrollWidth - parent.clientWidth;
let overflowY = children.clientHeight - parent.clientHeight;
return (overflowX > 1 || overflowY > 1);
@ -43,11 +44,12 @@ export class Ng2FittextDirective implements AfterViewInit, OnInit, OnChanges, Af
@HostListener('window:resize', ['$event'])
onResize() {
this.done = false;
if (this.activateOnResize && this.fittext) {
if (this.activateOnInputEvents && this.fittext) {
this.setFontSize(this.container ? this.container.clientHeight : this.el.nativeElement.parentElement.clientHeight);
this.setFontSize(this.getStartFontSizeFromHeight());
} else {
this.setFontSize(this.container ? this.container.clientWidth : this.el.nativeElement.parentElement.clientWidth);
this.setFontSize(this.getStartFontSizeFromWeight());
}
this.ngAfterViewInit();
@ -56,15 +58,17 @@ export class Ng2FittextDirective implements AfterViewInit, OnInit, OnChanges, Af
@HostListener('input', ['$event'])
onInputEvents() {
this.done = false;
if (this.activateOnInputEvents && this.fittext) {
this.setFontSize(this.container ? this.container.clientHeight : this.el.nativeElement.parentElement.clientHeight);
this.setFontSize(this.getStartFontSizeFromHeight());
this.ngAfterViewInit();
}
}
ngOnInit() {
this.done = false;
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) {
@ -75,6 +79,7 @@ export class Ng2FittextDirective implements AfterViewInit, OnInit, OnChanges, Af
}
ngAfterViewInit() {
if (this.isVisible() && this.done === false) {
if (this.fittext) {
let overflow = this.container ? this.checkOverflow(this.container, this.el.nativeElement)
: this.checkOverflow(this.el.nativeElement.parentElement, this.el.nativeElement);
@ -87,10 +92,12 @@ export class Ng2FittextDirective implements AfterViewInit, OnInit, OnChanges, Af
} 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.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() {
if (this.fontSize > this.minFontSize) {
this.setFontSize(this.container ? this.container.clientHeight : this.el.nativeElement.parentElement.clientHeight);
this.setFontSize(this.getStartFontSizeFromHeight());
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;
}
}