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view-pager.html
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view-pager.html
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<!--
`view-pager` creats layout similar to ViewPager in Android using one/multiple 'view-fragments`.
See <a href="#view-fragment">view-fragment</a> for more information about `view-fragment`.
Example:
<view-pager swipeDisabled="false" class="pink" selected="1" tabAttributes="['disableDrag','scrollable']">
<view-fragment name="One">
Content for first fragment.
</view-fragment>
<view-fragment name="Two">
Content for second fragment.
</view-fragment>
<view-fragment name="Three">
Content for third fragment.
</view-fragment>
</view-pager>
Styling Guide for changing look and feel of tabs for `view-pager`:
To change background, border and font color:
view-pager.pink::shadow paper-tabs{
background-color: #ED8CAD;
color:#FFFFFF;
border-bottom: 1px solid #ED8CAD;
}
To change ripple color:
view-pager.pink::shadow /deep/ #ink {
color: #ff4081;
}
To change selection bar color:
view-pager.pink /deep/ #selectionBar {
background-color: #ff4081;
}
@group ViewPager
@element view-pager
@homepage http://github.com/vivekmarakana/polymer-viewpager/
-->
<link rel="import" href="../polymer/polymer.html">
<link rel="import" href="../core-resizable/core-resizable.html">
<link rel="import" href="../paper-tabs/paper-tabs.html">
<link rel="import" href="view-fragment.html">
<polymer-element name="view-pager" attributes="swipeDisabled thresholdVelocity tabAttributes selected" fit>
<template>
<link rel="stylesheet" href="view-pager.css">
<paper-tabs id="viewTabs" selected="{{selected}}" on-core-activate="{{pageChange}}"></paper-tabs>
<div id="viewPager" fit>
<content select="view-fragment"></content>
</div>
</template>
<script>
Polymer(Polymer.mixin({
/**
* If given, attributes given in array will be passed to `paper-tabs` within `view-pager`.
*
* @attribute tabAttributes
* @type Array<String>
* @default null
*/
tabAttributes: [],
/**
* Sets the selected tab and view-fragment on load. Default is 0 to use the
* first tab.
*
* @attribute selected
* @type integer
* @default 0
*/
selected: 0,
/**
* If set to true, swiping the fragments is disabled. Only way to change view
* is clicking the tabs.
*
* @attribute swipeDisabled
* @type boolean
* @default false
*/
swipeDisabled: false,
thresholdVelocity: 1.0,
created: function() {
this.fragments = [];
this.width = 0;
this.dragging = false;
this.deltaTime = 0;
},
domReady: function(){
this.fragments = this.querySelectorAll('view-fragment');
for (var i = 0; i < this.fragments.length; i++) {
var _tab = document.createElement('paper-tab');
_tab.innerHTML = this.fragments[i].name;
this.$.viewTabs.appendChild(_tab);
};
for (var i = 0; i < this.tabAttributes.length; i++) {
this.setTabAttribute(this.tabAttributes[i]);
};
this.lastselected = this.selected;
this.updateFragments();
},
updateFragments: function(){
this.width = this.offsetWidth;
for (var i = 0; i < this.fragments.length; i++) {
this.fragments[i].style.left = (this.width * (i-this.selected))+"px";
};
},
pageChange: function(e, v, elem){
if(!this.dragging){
_targetOffset = (this.lastselected - this.selected) * this.width;
this.animateFragments(_targetOffset, false);
this.lastselected = this.selected;
}
},
animateFragments: function(offset, realTime){
_targetOffset = offset;
for (var i = 0; i < this.fragments.length; i++) {
_targetLeft = parseFloat(this.fragments[i].style.left) + _targetOffset;
this.fragments[i].animate(_targetLeft, realTime);
};
},
eventDelegates: {
trackstart: 'trackStart',
trackx: 'trackX',
trackend: 'trackEnd',
'core-resize': 'updateFragments'
},
trackStart: function(e) {
isEdge = ((e.ddx>0 && parseInt(this.fragments[0].style.left) >= 0) || (e.ddx<0 && parseInt(this.fragments[this.fragments.length - 1].style.left) <= 0)) ? true : false;
if (!this.swipeDisabled && !isEdge) {
e.preventTap();
e.cancelBubble = true;
this.dragging = true;
this.deltaTime = e.timeStamp;
}
},
trackX: function(e) {
if (this.dragging) {
this.animateFragments(e.ddx, true);
}
},
trackEnd: function(e) {
if (this.dragging) {
_final = 0;
this.deltaTime = e.timeStamp - this.deltaTime;
velocity = e.dx / this.deltaTime;
if(Math.abs(velocity) > this.thresholdVelocity){
i = this.selected;
if(velocity < 0) i++;
else i--;
min = parseFloat(this.fragments[i].style.left);
_final = i;
} else {
min = Math.abs(parseFloat(this.fragments[this.fragments.length - 1].style.left));
for (var i = 0; i < this.fragments.length; i++) {
if(Math.abs(parseFloat(this.fragments[i].style.left)) <= Math.abs(min)){
min = parseFloat(this.fragments[i].style.left);
_final = i;
}
}
}
this.selected = _final;
this.lastselected = _final;
this.$.viewTabs.updateBar();
this.animateFragments(0-min, false);
this.dragging = false;
}
},
setTabAttribute: function(attr, value){
if(typeof(value) === "undefined") value='';
this.$.viewTabs.setAttribute(attr, value);
}
}, Polymer.CoreResizable));
</script>
</polymer-element>