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<!--
@license
Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
Code distributed by Google as part of the polymer project is also
subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
-->
<link rel="import" href="../polymer/polymer.html">
<link rel="import" href="../iron-resizable-behavior/iron-resizable-behavior.html">
<link rel="import" href="../iron-selector/iron-selectable.html">
<link rel="import" href="neon-animation-runner-behavior.html">
<!--
Material design: [Meaningful transitions](https://www.google.com/design/spec/animation/meaningful-transitions.html)
`neon-animated-pages` manages a set of pages and runs an animation when switching between them. Its
children pages should implement `Polymer.NeonAnimatableBehavior` and define `entry` and `exit`
animations to be run when switching to or switching out of the page.
@group Neon Elements
@element neon-animated-pages
@demo demo/index.html
-->
<dom-module id="neon-animated-pages">
<template>
<style>
:host {
display: block;
position: relative;
}
:host > ::content > * {
position: absolute;
top: 0;
left: 0;
bottom: 0;
right: 0;
}
:host > ::content > :not(.iron-selected):not(.neon-animating) {
display: none !important;
}
:host > ::content > .neon-animating {
pointer-events: none;
}
</style>
<content id="content"></content>
</template>
</dom-module>
<script>
(function() {
Polymer({
is: 'neon-animated-pages',
behaviors: [
Polymer.IronResizableBehavior,
Polymer.IronSelectableBehavior,
Polymer.NeonAnimationRunnerBehavior
],
properties: {
activateEvent: {
type: String,
value: ''
},
// if true, the initial page selection will also be animated according to its animation config.
animateInitialSelection: {
type: Boolean,
value: false
}
},
listeners: {
'iron-select': '_onIronSelect',
'neon-animation-finish': '_onNeonAnimationFinish'
},
_onIronSelect: function(event) {
var selectedPage = event.detail.item;
// Only consider child elements.
if (this.items.indexOf(selectedPage) < 0) {
return;
}
var oldPage = this._valueToItem(this._prevSelected) || false;
this._prevSelected = this.selected;
// on initial load and if animateInitialSelection is negated, simply display selectedPage.
if (!oldPage && !this.animateInitialSelection) {
this._completeSelectedChanged();
return;
}
this.animationConfig = [];
// configure selectedPage animations.
if (this.entryAnimation) {
this.animationConfig.push({
name: this.entryAnimation,
node: selectedPage
});
} else {
if (selectedPage.getAnimationConfig) {
this.animationConfig.push({
animatable: selectedPage,
type: 'entry'
});
}
}
// configure oldPage animations iff exists.
if (oldPage) {
// cancel the currently running animation if one is ongoing.
if (oldPage.classList.contains('neon-animating')) {
this._squelchNextFinishEvent = true;
this.cancelAnimation();
this._completeSelectedChanged();
this._squelchNextFinishEvent = false;
}
// configure the animation.
if (this.exitAnimation) {
this.animationConfig.push({
name: this.exitAnimation,
node: oldPage
});
} else {
if (oldPage.getAnimationConfig) {
this.animationConfig.push({
animatable: oldPage,
type: 'exit'
});
}
}
// display the oldPage during the transition.
oldPage.classList.add('neon-animating');
}
// display the selectedPage during the transition.
selectedPage.classList.add('neon-animating');
// actually run the animations.
if (this.animationConfig.length >= 1) {
// on first load, ensure we run animations only after element is attached.
if (!this.isAttached) {
this.async(function () {
this.playAnimation(undefined, {
fromPage: null,
toPage: selectedPage
});
});
} else {
this.playAnimation(undefined, {
fromPage: oldPage,
toPage: selectedPage
});
}
} else {
this._completeSelectedChanged(oldPage, selectedPage);
}
},
/**
* @param {Object=} oldPage
* @param {Object=} selectedPage
*/
_completeSelectedChanged: function(oldPage, selectedPage) {
if (selectedPage) {
selectedPage.classList.remove('neon-animating');
}
if (oldPage) {
oldPage.classList.remove('neon-animating');
}
if (!selectedPage || !oldPage) {
var nodes = Polymer.dom(this.$.content).getDistributedNodes();
for (var node, index = 0; node = nodes[index]; index++) {
node.classList && node.classList.remove('neon-animating');
}
}
this.async(this._notifyPageResize);
},
_onNeonAnimationFinish: function(event) {
if (this._squelchNextFinishEvent) {
this._squelchNextFinishEvent = false;
return;
}
this._completeSelectedChanged(event.detail.fromPage, event.detail.toPage);
},
_notifyPageResize: function() {
var selectedPage = this.selectedItem || this._valueToItem(this.selected);
this.resizerShouldNotify = function(element) {
return element == selectedPage;
}
this.notifyResize();
}
})
})();
</script>
|
