Support styling components from outside with style hooks

@pkozlowski-opensource

I'm submitting a feature request:

In Shadow DOM you can create style hooks using CSS custom properties. It is possible in polymer too with custom-css-mixins.

Angular should support style hooks / or style projections.

Here is the syntax:

@Component({
  selector: 'ns-button',
  template: `
    <button>
      <i class="icon fa fa-fw fa-star"></i>
      <ng-content></ng-content>
    </button>
  `,
  styles: [`
    :host { 
      display: inline-block;

      /* projects --ns-button styles, this is like <ng-content></ng-content> 
        on the template level */
      @apply(--ns-button);
    }
    .icon {
      height: auto;
      max-width: 35px;
      @apply(--ns-button-icon)
    }
  `]
})
class NsButton {
}

@Component({
  selector: 'ns-app',
  template: `<ns-button>Click me!</ns-button>`,
  styles: [`
    ns-button {
      /* this is how you feed it with input, this is like ContentChild
       on the template level */
      --ns-button: {
        background-color: green;
        border-radius: 4px;
        border: 1px solid gray;
      };
      --ns-button-icon: {
        color: green;
      };
    }
  `]
})
class NsApp {
}

@pkozlowski-opensource @Foxandxss

You can even use polymer components in angular2 and use polymer's css-mixins projection.

import { PolymerElement } from '@vaadin/angular2-polymer';

@Component({
  selector: 'ns-app',
  directives: [
    PolymerElement('app-drawer'),
    PolymerElement('app-header'),
    PolymerElement('app-toolbar'),
    PolymerElement('paper-icon-button'),
    ],
  template: `
    <app-drawer [opened]="true" [swipeOpen]="true" #drawer>
      <div style="height: 80px"></div>
      <h3>side menu</h3>
      <ul>
        <li><a href="#">Home</a></li>
      </ul>
    </app-drawer>

    <app-header reveals>
      <app-toolbar>
        <paper-icon-button icon="menu" (click)="drawer.toggle()"></paper-icon-button>
        <div main-title>brand</div>
        <paper-icon-button icon="search"></paper-icon-button>
      </app-toolbar>
    </app-header>

    <div>
      <h3>main container</h3>
    </div>    
  `,
  styles: [require('./app.component.scss'), `    
    app-toolbar {
      /* you are projecting styles here */
      --app-toolbar-font-size: 20px;
    }
  `]
})
export class NsApp {
}

Sounds like #2567, #6274

@tsm91

@tsm91 Is the issue relevant? Maybe close the task...

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Support styling components from outside with style hooks #10663

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Support styling components from outside with style hooks #10663

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aegyed91 commented on Aug 11, 2016

zoechi commented on Aug 18, 2016

splincode commented on Jul 25, 2018

angular-robot commented on Jun 4, 2021

angular-robot commented on Jun 24, 2021

angular-automatic-lock-bot commented on Mar 4, 2022

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