<!DOCTYPE html>
<html>
<head>
<title>Elastic Header</title>
<script src="https://unpkg.com/vue@2"></script>
<script src="https://unpkg.com/dynamics.js@1.1.5/lib/dynamics.js"></script>
<link rel="stylesheet" type="text/css" href="./style.css" />
<script type="text/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>
</head>
<body>
<div id="app" @touchmove.prevent>
<draggable-header-view>
<template slot="header">
<h1>Elastic Draggable SVG Header</h1>
<p>
with <a href="http://vuejs.org">Vue.js</a> +
<a href="http://dynamicsjs.com">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>
</div>
<script>
Vue.component("draggable-header-view", {
template: "#header-view-template",
data: function() {
return {
dragging: false,
c: { x: 160, y: 160 },
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);
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: "#app" });
</script>
</body>
</html>
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, 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;
}
