iron-overlay-backdrop.html
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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-overlay-manager.html">
<!--
`iron-overlay-backdrop` is a backdrop used by `Polymer.IronOverlayBehavior`. It should be a
singleton.
### Styling
The following custom properties and mixins are available for styling.
Custom property | Description | Default
-------------------------------------------|------------------------|---------
`--iron-overlay-backdrop-background-color` | Backdrop background color | #000
`--iron-overlay-backdrop-opacity` | Backdrop opacity | 0.6
`--iron-overlay-backdrop` | Mixin applied to `iron-overlay-backdrop`. | {}
`--iron-overlay-backdrop-opened` | Mixin applied to `iron-overlay-backdrop` when it is displayed | {}
-->
<dom-module id="iron-overlay-backdrop">
<style>
:host {
position: fixed;
top: 0;
left: 0;
width: 100vw;
height: 100vh;
background-color: var(--iron-overlay-backdrop-background-color, #000);
opacity: 0;
transition: opacity 0.2s;
@apply(--iron-overlay-backdrop);
}
:host([opened]) {
opacity: var(--iron-overlay-backdrop-opacity, 0.6);
@apply(--iron-overlay-backdrop-opened);
}
</style>
<template>
<content></content>
</template>
</dom-module>
<script>
(function() {
Polymer({
is: 'iron-overlay-backdrop',
properties: {
/**
* Returns true if the backdrop is opened.
*/
opened: {
readOnly: true,
reflectToAttribute: true,
type: Boolean,
value: false
},
_manager: {
type: Object,
value: Polymer.IronOverlayManager
}
},
/**
* Appends the backdrop to document body and sets its `z-index` to be below the latest overlay.
*/
prepare: function() {
if (!this.parentNode) {
Polymer.dom(document.body).appendChild(this);
this.style.zIndex = this._manager.currentOverlayZ() - 1;
}
},
/**
* Shows the backdrop if needed.
*/
open: function() {
// only need to make the backdrop visible if this is called by the first overlay with a backdrop
if (this._manager.getBackdrops().length < 2) {
this._setOpened(true);
}
},
/**
* Hides the backdrop if needed.
*/
close: function() {
// only need to make the backdrop invisible if this is called by the last overlay with a backdrop
if (this._manager.getBackdrops().length < 2) {
this._setOpened(false);
}
},
/**
* Removes the backdrop from document body if needed.
*/
complete: function() {
// only remove the backdrop if there are no more overlays with backdrops
if (this._manager.getBackdrops().length === 0 && this.parentNode) {
Polymer.dom(this.parentNode).removeChild(this);
}
}
});
})();
</script>