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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-behaviors/iron-button-state.html">
<link rel="import" href="paper-ripple-behavior.html">
<script>
/** @polymerBehavior Polymer.PaperButtonBehavior */
Polymer.PaperButtonBehaviorImpl = {
properties: {
/**
* The z-depth of this element, from 0-5. Setting to 0 will remove the
* shadow, and each increasing number greater than 0 will be "deeper"
* than the last.
*
* @attribute elevation
* @type number
* @default 1
*/
elevation: {
type: Number,
reflectToAttribute: true,
readOnly: true
}
},
observers: [
'_calculateElevation(focused, disabled, active, pressed, receivedFocusFromKeyboard)',
'_computeKeyboardClass(receivedFocusFromKeyboard)'
],
hostAttributes: {
role: 'button',
tabindex: '0',
animated: true
},
_calculateElevation: function() {
var e = 1;
if (this.disabled) {
e = 0;
} else if (this.active || this.pressed) {
e = 4;
} else if (this.receivedFocusFromKeyboard) {
e = 3;
}
this._setElevation(e);
},
_computeKeyboardClass: function(receivedFocusFromKeyboard) {
this.toggleClass('keyboard-focus', receivedFocusFromKeyboard);
},
/**
* In addition to `IronButtonState` behavior, when space key goes down,
* create a ripple down effect.
*
* @param {!KeyboardEvent} event .
*/
_spaceKeyDownHandler: function(event) {
Polymer.IronButtonStateImpl._spaceKeyDownHandler.call(this, event);
// Ensure that there is at most one ripple when the space key is held down.
if (this.hasRipple() && this.getRipple().ripples.length < 1) {
this._ripple.uiDownAction();
}
},
/**
* In addition to `IronButtonState` behavior, when space key goes up,
* create a ripple up effect.
*
* @param {!KeyboardEvent} event .
*/
_spaceKeyUpHandler: function(event) {
Polymer.IronButtonStateImpl._spaceKeyUpHandler.call(this, event);
if (this.hasRipple()) {
this._ripple.uiUpAction();
}
}
};
/** @polymerBehavior */
Polymer.PaperButtonBehavior = [
Polymer.IronButtonState,
Polymer.IronControlState,
Polymer.PaperRippleBehavior,
Polymer.PaperButtonBehaviorImpl
];
</script>
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