Angular2 - Components - articleItem

偷取了这个 CSS 效果做了一个组件

原设计地址：
http://codepen.io/balapa/pen/vLzmmM

• 原设计尺寸位置都是固定的。css 做了一些改动，并且动画改动了下，没有做椭圆轨迹的移动。以后看能否加上
• 添加了基本的文字 overflow 的处理
• 和 Read More 按钮
• 箭头引用的是 awesome Font 的 lib

---

这个组件接受 3 个 inputs

• height
• width
• article 对象
  都有默认值

效果图：

源码地址 https://github.com/dreambo8563/CSS_Learning/tree/master/articleItem

基本使用 <animate height="600px" width="800px" [article]="article"></animate>

import {
  Component,
  OnInit,
  OnDestroy,
  ViewChild,
  ElementRef,
  Renderer,
  Input,
  Optional,
  Self,
  Attribute
} from "angular2/core"

@Component({
  selector: "animate",
  templateUrl: "./app/components/articleItem.html",
  styleUrls: ["./app/components/articleItem.css"]
})
export class ArticleItem implements OnInit, OnDestroy {
  @ViewChild("content")
  content: ElementRef
  @ViewChild("header")
  header: ElementRef

  @Input("article")
  article: { title: string, content: string }

  _article = {
    title: `This is a title`,
    content: `This is the main content. In this area,
                    the header will be hidden. `
  }
  _height: string = "400px"
  _width: string = "400px"

  constructor(
    @Optional()
    @Self()
    @Attribute("height")
    height: string,
    @Optional()
    @Self()
    @Attribute("width")
    width: string
  ) {
    this._height = height || this._height
    this._width = width || this._width
  }

  ngOnInit() {
    this._article = this.article || this._article
  }
  ngOnDestroy() {
    console.log("ngOnDestroy")
  }

  toggle() {
    this.header.nativeElement.classList.toggle("active")
    this.content.nativeElement.classList.toggle("active")
  }
}

inputs 值的检查放到 OnInit 里，因为在构造的时候还是 undefined

@import url(https://fonts.googleapis.com/css?family=Roboto:400, 300, 500);

::-webkit-scrollbar {
  display: none;
}

::-moz-scrollbar {
  display: none;
}

.cardRoot {
  /*height: 800px;
    width: 400px;
    margin-left: 500px;*/
  position: relative;
  border-style: solid;
  border-color: #f9b24f;
}

header {
  height: 100%;
  width: 100%;
  pointer-events: none;
}

header .title {
  position: absolute;
  top: 40%;
  left: 10%;
  color: white;
  font-size: 40px;
  line-height: 40px;
  transition: 0.3s all ease;
  z-index: 999;
  font-family: Roboto;
  font-weight: 300;
  text-transform: capitalize;
  right: 10%;
  word-wrap: break-word;
  bottom: 10%;
  overflow: hidden;
}

header .header-bg {
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
  background: #ec4590;
  transition: 0.3s all ease;
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
}

header.active .title {
  font-size: 20px;
  line-height: 30px;
  top: 4%;
  text-shadow: 10px 5px 2px #0f0c0f;
  transition: 0.3s all ease 0.15s;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

header.active .header-bg {
  height: 20%;
  background: #e11873;
  transition: 0.3s all ease 0.15s;
}

header.active .cta-ctr {
  top: calc(20% - 30px);
  bottom: auto;
  -webkit-transform: rotate(0deg);
  -moz-transform: rotate(0deg);
  -ms-transform: rotate(0deg);
  -o-transform: rotate(0deg);
  transform: rotate(0deg);
  transition: 0.5s all ease 0.2s;
}

header.active .cta .fa {
  -webkit-transform: rotate(180deg);
  -moz-transform: rotate(180deg);
  -ms-transform: rotate(180deg);
  -o-transform: rotate(180deg);
  transform: rotate(180deg);
  transition: 0.5s all ease 0.2s;
}

header .cta-ctr {
  position: absolute;
  right: 10%;
  top: calc(100% - 30px);
  -webkit-transform: rotate(-90deg);
  -moz-transform: rotate(-90deg);
  -ms-transform: rotate(-90deg);
  -o-transform: rotate(-90deg);
  transform: rotate(-90deg);
  transition: 0.3s all ease;
}

header .cta {
  width: 60px;
  height: 60px;
  background: #f9b24f;
  border-radius: 50%;
  cursor: pointer;
  transition: 0.3s all ease;
  pointer-events: auto;
  position: relative;
  box-shadow: 0 8px 12px 1px rgba(0, 0, 0, 0.15);
}

header .cta .fa {
  border-radius: 50%;
  position: absolute;
  color: white;
  font-size: 20px;
  right: 20px;
  bottom: 20px;
  -webkit-transform: rotate(90deg);
  -moz-transform: rotate(90deg);
  -ms-transform: rotate(90deg);
  -o-transform: rotate(90deg);
  transform: rotate(90deg);
  transition: 0.3s all ease;
}

header .cta:hover {
  background-color: #fabd68;
}

.content-ctr {
  width: 100%;
  height: 100%;
  background: white;
  overflow: scroll;
  position: relative;
}

.content-ctr.active .header-content-ctr {
  height: 0%;
  transition: 0.3s height ease 0.45s;
}

.content-ctr.active .header-content-ctr .title {
  transition: 0.3s all ease;
  opacity: 0;
  -webkit-transform: translateY(-20px);
  -moz-transform: translateY(-20px);
  -ms-transform: translateY(-20px);
  -o-transform: translateY(-20px);
  transform: translateY(-20px);
}

.content-ctr.active .main-content-ctr {
  height: 100%;
  overflow: scroll;
}

.content-ctr.active .main-content-ctr .par {
  transition: 0.3s all ease 0.7s;
  -webkit-transform: translateY(0px);
  -moz-transform: translateY(0px);
  -ms-transform: translateY(0px);
  -o-transform: translateY(0px);
  transform: translateY(0px);
  opacity: 1;
}

.content-ctr .title {
  font-family: Roboto;
  margin-bottom: 30px;
  font-size: 34px;
  color: #e61875;
  transition: 0.3s all ease;
}

.content-ctr .par {
  font-family: Roboto;
  font-size: 18px;
  line-height: 1.5;
  font-weight: 300;
  color: #777;
}

.content-ctr .header-content-ctr {
  position: relative;
  height: 100%;
  overflow: hidden;
  transition: 0.3s height ease;
}

.content-ctr .header-content-ctr .title {
  transition: 0.3s all ease 0.15s;
}

.content-ctr .header-content {
  position: absolute;
  right: 0;
  bottom: 110px;
  left: 80px;
}

.content-ctr .main-content-ctr {
  position: relative;
  min-height: 0%;
  transition: 0.3s height ease;
  overflow: hidden;
}

.content-ctr .main-content-ctr .title,
.content-ctr .main-content-ctr .par {
  opacity: 0;
  -webkit-transform: translateY(20px);
  -moz-transform: translateY(20px);
  -ms-transform: translateY(20px);
  -o-transform: translateY(20px);
  transform: translateY(20px);
}

.content-ctr .main-content {
  position: relative;
  top: 35%;
  /* right: 10%; */
  left: 0;
  margin-right: 10%;
  margin-left: 10%;
  height: 60%;
  overflow: hidden;
}

.read-more {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  text-align: center;
  margin: 0;
  padding: 4px 0;
  /* "transparent" only works here because == rgba(0,0,0,0) */
  background-image: linear-gradient(to bottom, transparent, #fabd68);
  transition: 0.8s all ease;
}

.read-more a.button {
  color: #e61875;
  text-decoration: none;
}

.read-more:hover {
  font-size: 24px;
}

<div class="cardRoot" [style.width]="_width" [style.height]="_height">
    <div #content class='content-ctr'>
        <div class='main-content-ctr'>
            <div class='main-content'>
                <div class='par'>{{_article.content}} </div>
                <p class="read-more"><a href="#" class="button">Read More</a></p>
            </div>
        </div>
    </div>
    <header #header>
        <div class='header-bg'></div>
        <div class='header-content'>
            <div class='title'>{{_article.title}}</div>
        </div>
        <div class='cta-ctr'>
            <div class='cta' (click)="toggle()">
                <i class="fa fa-arrow-up"></i>
            </div>
        </div>
    </header>
</div>