Javascript 如何使用@angular/animations设置ScrollTop动画？

我正在尝试从Material.io复制此动画：

只需像上面示例中单击第一张卡那样导航高度很简单。只需设置高度属性的动画。问题在于点击第二张卡，然后将其他卡推开

一种解决方案是使用scroll模拟事物被推开的效果。因此，当您单击该项目时，它不仅通过设置高度动画使其更高，而且还同时滚动视图

我的问题是： 我似乎不知道如何使用

@angular/animations

为卷轴设置动画。 我不能使用

样式（{scrollTop:100}）

，它只允许根据样式设置CSS属性

---

我如何做到这一点？如果出于维护原因（将整个动画保留在代码中的一个位置），我可以将其作为

animate（）

动画的一部分，那就太好了，但是如果只能使用单独的方法，我想这也是可以接受的。

我成功地创建了它，使用了三种角度动画状态：小、大和正常，与div的高度相对应：

动画。ts

import { expand } from './animations';

@Component({
  ...
  animations: [expand]
})
export class AppComponent implements OnInit {
  expandState1 = 'normal';
  expandState2 = 'normal';
  expandState3 = 'normal';
  expandState4 = 'normal';
  expandState5 = 'normal';

  ngOnInit() {
    this.resetStates();
  }

  resetStates() {
    this.expandState1 = 'normal';
    this.expandState2 = 'normal';
    this.expandState3 = 'normal';
    this.expandState4 = 'normal';
    this.expandState5 = 'normal';
  }

  toggleShowDiv(divName: string) {
    if (divName === 'div1') {
      if (this.expandState1 === 'normal' || this.expandState1 === 'small') {
        this.setToBig([1]);
        this.setToSmall([2, 3, 4, 5]);
      } else if (this.expandState1 === 'big' || this.expandState1 === 'small') {
        this.resetStates();
      }
    } else if (divName === 'div2') {
      if (this.expandState2 === 'normal' || this.expandState2 === 'small') {
        this.setToBig([2]);
        this.setToSmall([1, 3, 4, 5]);
      } else if (this.expandState2 === 'big') {
        this.resetStates();
      }
    } else if (divName === 'div3') {
      if (this.expandState3 === 'normal' || this.expandState3 === 'small') {
        this.setToBig([3]);
        this.setToSmall([1, 2, 4, 5]);
      } else if (this.expandState3 === 'big') {
        this.resetStates();
      }
    } else if (divName === 'div4') {
      if (this.expandState4 === 'normal' || this.expandState4 === 'small') {
        this.setToBig([4]);
        this.setToSmall([1, 2, 3, 5]);
      } else if (this.expandState4 === 'big') {
        this.resetStates();
      }
    } else if (divName === 'div5') {
      if (this.expandState5 === 'normal' || this.expandState5 === 'small') {
        this.setToBig([5]);
        this.setToSmall([1, 2, 3, 4]);
      } else if (this.expandState5 === 'big') {
        this.resetStates();
      }
    }
  }

  setToSmall(choices: any) {
    for (let i = 0; i < choices.length; i++) {
      switch (choices[i]) {
        case 1:
          this.expandState1 = 'small';
          break;
        case 2:
          this.expandState2 = 'small';
          break;
        case 3:
          this.expandState3 = 'small';
          break;
        case 4:
          this.expandState4 = 'small';
          break;
        case 5:
          this.expandState5 = 'small';
          break;
        default:
          break;
      }
    }
  }

  setToBig(choices: any) {
    for (let i = 0; i < choices.length; i++) {
      switch (choices[i]) {
        case 1:
          this.expandState1 = 'big';
          break;
        case 2:
          this.expandState2 = 'big';
          break;
        case 3:
          this.expandState3 = 'big';
          break;
        case 4:
          this.expandState4 = 'big';
          break;
        case 5:
          this.expandState5 = 'big';
          break;
        default:
          break;
      }
    }
  }
}

这里，我以每个div使用一个状态变量为例，默认情况下，我将这些状态中的每一个设置为normal。 然后，根据我点击哪个div，我根据我们想要发生的事情来切换状态：使我们点击的div变大，其他的变小

应用程序组件.ts

import { expand } from './animations';

@Component({
  ...
  animations: [expand]
})
export class AppComponent implements OnInit {
  expandState1 = 'normal';
  expandState2 = 'normal';
  expandState3 = 'normal';
  expandState4 = 'normal';
  expandState5 = 'normal';

  ngOnInit() {
    this.resetStates();
  }

  resetStates() {
    this.expandState1 = 'normal';
    this.expandState2 = 'normal';
    this.expandState3 = 'normal';
    this.expandState4 = 'normal';
    this.expandState5 = 'normal';
  }

  toggleShowDiv(divName: string) {
    if (divName === 'div1') {
      if (this.expandState1 === 'normal' || this.expandState1 === 'small') {
        this.setToBig([1]);
        this.setToSmall([2, 3, 4, 5]);
      } else if (this.expandState1 === 'big' || this.expandState1 === 'small') {
        this.resetStates();
      }
    } else if (divName === 'div2') {
      if (this.expandState2 === 'normal' || this.expandState2 === 'small') {
        this.setToBig([2]);
        this.setToSmall([1, 3, 4, 5]);
      } else if (this.expandState2 === 'big') {
        this.resetStates();
      }
    } else if (divName === 'div3') {
      if (this.expandState3 === 'normal' || this.expandState3 === 'small') {
        this.setToBig([3]);
        this.setToSmall([1, 2, 4, 5]);
      } else if (this.expandState3 === 'big') {
        this.resetStates();
      }
    } else if (divName === 'div4') {
      if (this.expandState4 === 'normal' || this.expandState4 === 'small') {
        this.setToBig([4]);
        this.setToSmall([1, 2, 3, 5]);
      } else if (this.expandState4 === 'big') {
        this.resetStates();
      }
    } else if (divName === 'div5') {
      if (this.expandState5 === 'normal' || this.expandState5 === 'small') {
        this.setToBig([5]);
        this.setToSmall([1, 2, 3, 4]);
      } else if (this.expandState5 === 'big') {
        this.resetStates();
      }
    }
  }

  setToSmall(choices: any) {
    for (let i = 0; i < choices.length; i++) {
      switch (choices[i]) {
        case 1:
          this.expandState1 = 'small';
          break;
        case 2:
          this.expandState2 = 'small';
          break;
        case 3:
          this.expandState3 = 'small';
          break;
        case 4:
          this.expandState4 = 'small';
          break;
        case 5:
          this.expandState5 = 'small';
          break;
        default:
          break;
      }
    }
  }

  setToBig(choices: any) {
    for (let i = 0; i < choices.length; i++) {
      switch (choices[i]) {
        case 1:
          this.expandState1 = 'big';
          break;
        case 2:
          this.expandState2 = 'big';
          break;
        case 3:
          this.expandState3 = 'big';
          break;
        case 4:
          this.expandState4 = 'big';
          break;
        case 5:
          this.expandState5 = 'big';
          break;
        default:
          break;
      }
    }
  }
}

下面是我为此制作的StackBlitz示例：

<div class="wrapper scrollableDiv">
  <div [@expand]="expandState1" (click)="toggleShowDiv('div1')" class="content divA">THIS IS CONTENT DIV 1</div>
  <div [@expand]="expandState2" (click)="toggleShowDiv('div2')" class="content divA">THIS IS CONTENT DIV 2</div>
  <div [@expand]="expandState3" (click)="toggleShowDiv('div3')" class="content divA">THIS IS CONTENT DIV 3</div>
  <div [@expand]="expandState4" (click)="toggleShowDiv('div4')" class="content divA">THIS IS CONTENT DIV 4</div>
  <div [@expand]="expandState5" (click)="toggleShowDiv('div5')" class="content divA">THIS IS CONTENT DIV 5</div>
</div>