角度 – 可收缩的垫子工具栏

发布时间：2020-12-17 17:55:12 所属栏目：安全来源：网络整理

导读：我使用此处提供的示例来设置响应式导航栏 https://theinfogrid.com/tech/developers/angular/responsive-navbar-angular-flex-layout/ 我的代码看起来非常相似 div style="height: 85vh;" mat-toolbar color="primary" mat-scroll-shrink span{{title}}/span

我使用此处提供的示例来设置响应式导航栏

https://theinfogrid.com/tech/developers/angular/responsive-navbar-angular-flex-layout/

我的代码看起来非常相似

<div style="height: 85vh;">

  <mat-toolbar color="primary" mat-scroll-shrink>
    <span>{{title}}</span>
    <span class="example-spacer"></span>
    <div fxShow="true" fxHide.lt-md="true">
      <!-- The following menu items will be hidden on both SM and XS screen sizes -->
      <a href="#" mat-button>Home</a>
      <a href="#" mat-button>About</a>
      <a href="#" mat-button>Services</a>
      <a href="#" mat-button>Portfolio</a>
      <a href="#" mat-button>Start</a>
      <a href="#" mat-button>FAQ</a>
      <a href="#" mat-button>Blog</a>
      <a href="#" mat-button>Contact</a>
    </div>

    <div fxShow="true" fxHide.gt-sm="true">
      <a href="#" (click)="sidenav.open()">Show Side Menu</a>
    </div>
  </mat-toolbar>

  <mat-sidenav-container fxFlexFill class="example-container">
    <mat-sidenav #sidenav fxLayout="column">
      <div fxLayout="column">
        <a (click)="sidenav.close()" href="#" mat-button>Close</a>
        <a href="#" mat-button>Home</a>
        <a href="#" mat-button>About</a>
        <a href="#" mat-button>Services</a>
        <a href="#" mat-button>Portfolio</a>
        <a href="#" mat-button>Start</a>
        <a href="#" mat-button>FAQ</a>
        <a href="#" mat-button>Blog</a>
        <a href="#" mat-button>Contact</a>
      </div>
    </mat-sidenav>
    <mat-sidenav-content fxFlexFill>

      <p>Demoing some content to make this thing scroll</p>
      <p>Demoing some content to make this thing scroll</p>
      <p>Demoing some content to make this thing scroll</p>
      <p>Demoing some content to make this thing scroll</p>
      <p>Demoing some content to make this thing scroll</p>
      <p>Demoing some content to make this thing scroll</p>
      <p>Demoing some content to make this thing scroll</p>
      <p>Demoing some content to make this thing scroll</p>
      <p>Demoing some content to make this thing scroll</p>
      <p>Demoing some content to make this thing scroll</p>
      <p>Demoing some content to make this thing scroll</p>
      <p>Demoing some content to make this thing scroll</p>
      <p>Demoing some content to make this thing scroll</p>
      <p>Demoing some content to make this thing scroll</p>
      <p>Demoing some content to make this thing scroll</p>
      <p>Demoing some content to make this thing scroll</p>
      <p>Demoing some content to make this thing scroll</p>
      <p>Demoing some content to make this thing scroll</p>
      <p>Demoing some content to make this thing scroll</p>
      <p>Demoing some content to make this thing scroll</p>
      <p>Demoing some content to make this thing scroll</p>
      <p>Demoing some content to make this thing scroll</p>
      <p>Demoing some content to make this thing scroll</p>
    </mat-sidenav-content>
  </mat-sidenav-container>
</div>

我想要发生的是当我向下滚动时,mat-toolbar会缩小,这在很多站点都很常见,比如这个：

https://www.havealook.com.au/

我不会发布其余的角度5代码,只需按照示例重新创建 – 它非常快.

我在这里查看了材料网站

https://material.angular.io/components/toolbar/overview

但是关于如何添加它没有太多解释,我对这些东西很新.有没有人知道如何自定义这个以使工具栏缩小,基于滚动？

解决方法

2018年11月更新

ScularDispatchModule已弃用Angular CDK v7.请改用ScrollingModule.

我创建了一个带有工具栏的Stackblitz,当向下滚动时会收缩.

主要步骤

使用CdkScrollDispatcher服务来响应滚动事件

>在模块中导入ScrollDispatchModule.

import {ScrollDispatchModule} from '@angular/cdk/scrolling';

>标记滚动事件与指令cdkScrollable相关的容器,这里是mat-sidenav-content.

<mat-sidenav-content fxFlexFill cdkScrollable>

> React以滚动组件的ngOnInit中的事件,获取scrollTop位置并设置一个标志,如果它大于某个阈值：

private readonly SHRINK_TOP_SCROLL_POSITION = 50;
shrinkToolbar = false;

constructor(private scrollDispatcher: ScrollDispatcher,private ngZone: NgZone) { }

ngOnInit() {
  this.scrollDispatcher.scrolled()
    .pipe(
      map((event: CdkScrollable) => event.getElementRef().nativeElement.scrollTop)
    )
    .subscribe(scrollTop => this.ngZone.run(() => this.shrinkToolbar = scrollTop > this.SHRINK_TOP_SCROLL_POSITION ? true : false));
}

您需要使用ngZone运行它,因为默认情况下ScrollDispatcher的scrolled()事件在Angular之外运行.没有它,ChangeDetection将无法运行,您的模板也不会更新.

滚动时更改工具栏布局

>向下滚动容器时,添加一个缩小css类

<mat-toolbar color="primary" [ngClass]="{'shrink-toolbar': shrinkToolbar}">

>为缩小布局定义css类.

.shrink-toolbar {
  height: 32px;
}

在official docs中查找有关滚动服务的更多信息.

（编辑：李大同）

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