# Elastic Header Example

html
```
<!-- template for the component -->
<script type="x/template" id="header-view-template">
<div class="draggable-header-view"
@mousedown="startDrag" @touchstart="startDrag"
@mousemove="onDrag" @touchmove="onDrag"
@mouseup="stopDrag" @touchend="stopDrag" @mouseleave="stopDrag">
<svg class="bg" width="320" height="560">
<path :d="headerPath" fill="#3F51B5"></path>
</svg>
<div class="header">
<slot name="header"></slot>
</div>
<div class="content" :style="contentPosition">
<slot name="content"></slot>
</div>
</div>
</script>
<draggable-header-view>
<template slot="header">
<h1>Elastic Draggable SVG Header</h1>
<p>with <a href="http://vuejs.org" target="_blank">Vue.js</a> + <a href="http://dynamicsjs.com" target="_blank">dynamics.js</a></p>
</template>
<template slot="content">
<p>Note this is just an effect demo - there are of course many additional details if you want to use this in production, e.g. handling responsive sizes, reload threshold and content scrolling. Those are out of scope for this quick little hack. However, the idea is that you can hide them as internal details of a Vue.js component and expose a simple Web-Component-like interface.</p>
</template>
</draggable-header-view>
```
js
```
document.body.addEventListener('touchmove', function (e) {
e.preventDefault()
})
Vue.component('draggable-header-view', {
template: '#header-view-template',
data: function () {
return {
dragging: false,
// quadratic bezier control point
c: { x: 160, y: 160 },
// record drag start point
start: { x: 0, y: 0 }
}
},
computed: {
headerPath: function () {
return 'M0,0 L320,0 320,160' +
'Q' + this.c.x + ',' + this.c.y +
' 0,160'
},
contentPosition: function () {
var dy = this.c.y - 160
var dampen = dy > 0 ? 2 : 4
return {
transform: 'translate3d(0,' + dy / dampen + 'px,0)'
}
}
},
methods: {
startDrag: function (e) {
e = e.changedTouches ? e.changedTouches[0] : e
this.dragging = true
this.start.x = e.pageX
this.start.y = e.pageY
},
onDrag: function (e) {
e = e.changedTouches ? e.changedTouches[0] : e
if (this.dragging) {
this.c.x = 160 + (e.pageX - this.start.x)
// dampen vertical drag by a factor
var dy = e.pageY - this.start.y
var dampen = dy > 0 ? 1.5 : 4
this.c.y = 160 + dy / dampen
}
},
stopDrag: function () {
if (this.dragging) {
this.dragging = false
dynamics.animate(this.c, {
x: 160,
y: 160
}, {
type: dynamics.spring,
duration: 700,
friction: 280
})
}
}
}
})
new Vue({ el: 'body' })
```
css
```
h1 {
font-weight: 300;
font-size: 1.8em;
margin-top: 0;
}
a {
color: #fff;
}
.draggable-header-view {
background-color: #fff;
box-shadow: 0 4px 16px rgba(0,0,0,.15);
width: 320px;
height: 560px;
overflow: hidden;
margin: 30px auto;
position: relative;
font-family: 'Roboto', Helvetica, Arial, sans-serif;
color: #fff;
font-size: 14px;
font-weight: 300;
-webkit-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
}
.draggable-header-view .bg {
position: absolute;
top: 0;
left: 0;
z-index: 0;
}
.draggable-header-view .header, .draggable-header-view .content {
position: relative;
z-index: 1;
padding: 30px;
box-sizing: border-box;
}
.draggable-header-view .header {
height: 160px;
}
.draggable-header-view .content {
color: #333;
line-height: 1.5em;
}
```
- 教程
- 起步
- 概述
- Vue 實例
- 數據綁定語法
- 計算屬性
- Class 與 Style 綁定
- 條件渲染
- 列表渲染
- 方法與事件處理器
- 表單控件綁定
- 過渡
- 組件
- 深入響應式原理
- 自定義指令
- 自定義過濾器
- 混合
- 插件
- 構建大型應用
- 對比其它框架
- API
- 示例
- Markdown 編輯器 Example
- GitHub 提交 Example
- Firebase + 驗證 Example
- 表格組件 Example
- 樹狀視圖 Example
- SVG 圖形 Example
- 模態組件 Example
- Elastic Header Example
- 自定義指令 Example
- TodoMVC Example
- HackerNews 克隆 Example