Does anybody know how to use/enable the animated icons?

问题

Does anybody know how to use/enable the animated icons in an Angular WebApplication which are shown in the material design documentation: https://material.io/design/iconography/animated-icons.html#usage

回答1:

As other have stated the examples on the Material Icon sites would have to be built.

However, I found my way to this question looking for a guide on how to animate angular material icons and for others looking for the same I have a solution. The default animation can be customized to something other than just a 360 degree rotation.

Basically you can create a component that swaps between mat-icon's when clicked or when a parent element like a button is clicked.

Prerequisites are you have a an angular material application with material icons installed. I used Angular Material 8.

Here is a working Stackblitz https://stackblitz.com/edit/angular-material-prototype-animated-icon

mat-animated-icon.component.ts

import { Component, Input, OnInit } from '@angular/core';

@Component({
  selector: 'mat-animated-icon',
  templateUrl: './mat-animated-icon.component.html',
  styleUrls: ['./mat-animated-icon.component.scss']
})
export class MatAnimatedIconComponent implements OnInit {

  @Input() start: String;
  @Input() end: String;
  @Input() colorStart: String;
  @Input() colorEnd: String;
  @Input() animate: boolean;
  @Input() animateFromParent?: boolean = false;

  constructor() { }

  ngOnInit() {
    console.log(this.colorStart);
    console.log(this.colorEnd);
  }

  toggle() {
    if(!this.animateFromParent) this.animate = !this.animate;
  }

}

mat-animated-icon.component.scss

:host {
  font-family: 'Material Icons';
  font-weight: normal;
  font-style: normal;
  font-size: 24px;  /* Preferred icon size */
  display: inline-block;
  line-height: 1;
  text-transform: none;
  letter-spacing: normal;
  word-wrap: normal;
  white-space: nowrap;
  direction: ltr;

  /* Support for all WebKit browsers. */
  -webkit-font-smoothing: antialiased;
  /* Support for Safari and Chrome. */
  text-rendering: optimizeLegibility;

  /* Support for Firefox. */
  -moz-osx-font-smoothing: grayscale;

  /* Support for IE. */
  font-feature-settings: 'liga';

  /* Rules for sizing the icon. */
  &.md-18 { font-size: 18px; }
  &.md-24 { font-size: 24px; }
  &.md-36 { font-size: 36px; }
  &.md-48 { font-size: 48px; }

  /* Rules for using icons as black on a light background. */
  &.md-dark { 
    color: rgba(0, 0, 0, 0.54);

    &.md-inactive { color: rgba(0, 0, 0, 0.26); }
  }

  /* Rules for using icons as white on a dark background. */
  &.md-light { 
    color: rgba(255, 255, 255, 1);

    &.md-inactive { color: rgba(255, 255, 255, 0.3); }
  }

  .material-icons {
    transition: transform .5s;
    &.animate {
      transform: rotate(360deg);
    }
  }
}

mat-animated-icon.component.html

<mat-icon [ngClass]="{'animate' : animate}" color="{{animate ? colorEnd : colorStart}}" (click)="toggle()">{{animate ? end : start}}</mat-icon>

var.directive.ts

a little helper directive

import { Directive, Input } from '@angular/core';

@Directive({
  selector: '[var]',
  exportAs: 'var'
})
export class VarDirective {

  @Input() var:any;

  constructor() { }

}

Example of the component in use

<button (click)="!this.disabled && iconAnimate10.var=!iconAnimate10.var" #iconAnimate10="var" var="'false'" mat-icon-button [disabled]="false" aria-label="Example icon-button with a heart icon">
<mat-animated-icon start="menu" end="close" colorStart="none" colorEnd="none" [animate]="iconAnimate10.var" animateFromParent="true"></mat-animated-icon>

回答2:

There is library that easy animate angular. https://github.com/filipows/angular-animations

I just used that on angular 8 to animate favorite icons, it's very straightforward.

This example makes full star into empty star and vice versa.

Compount:

import { fadeInOnEnterAnimation, fadeOutOnLeaveAnimation } from 'angular-animations';
@Component({animations: [
    fadeInOnEnterAnimation(),
    fadeOutOnLeaveAnimation()
]})

public toggleFavorite() {
    this.isFavorite = !this.isFavorite;
}

html:

 <div style="display: grid;" id="favoriteContainer" (click)=toggleFavorite() matTooltip="Favorite" >
              <mat-icon style="grid-column: 1;grid-row: 1;" *ngIf="!isFavorite" [@fadeInOnEnter] [@fadeOutOnLeave]>star_border</mat-icon>
              <mat-icon style="grid-column: 1;grid-row: 1;" *ngIf="isFavorite" [@fadeInOnEnter] [@fadeOutOnLeave]>star</mat-icon>
          </div>

回答3:

You could implement through a component using icons. Implement a component which contains array for icons then swap the icons regular interval. Each icon represent a state/image.

For eg : Use following icons in an array then swap it every every 100ms.

• https://fontawesome.com/v4.7.0/icon/pencil
• https://fontawesome.com/v4.7.0/icon/pencil-square-o
• https://fontawesome.com/v4.7.0/icon/pencil-square

Update:

Refer to Animate Font Awesome icons in Angular article.

Forked from above https://stackblitz.com/edit/animated-icons-angular-forked

回答4:

material.io is specification and guid how to make material design ,angular material component is build on this kind of specification but the don't show any information about animate google material icon.

来源：https://stackoverflow.com/questions/51325400/does-anybody-know-how-to-use-enable-the-animated-icons