iron-control-state.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">
<script>
/**
* @demo demo/index.html
* @polymerBehavior
*/
Polymer.IronControlState = {
properties: {
/**
* If true, the element currently has focus.
*/
focused: {
type: Boolean,
value: false,
notify: true,
readOnly: true,
reflectToAttribute: true
},
/**
* If true, the user cannot interact with this element.
*/
disabled: {
type: Boolean,
value: false,
notify: true,
observer: '_disabledChanged',
reflectToAttribute: true
},
_oldTabIndex: {
type: Number
},
_boundFocusBlurHandler: {
type: Function,
value: function() {
return this._focusBlurHandler.bind(this);
}
}
},
observers: [
'_changedControlState(focused, disabled)'
],
ready: function() {
this.addEventListener('focus', this._boundFocusBlurHandler, true);
this.addEventListener('blur', this._boundFocusBlurHandler, true);
},
_focusBlurHandler: function(event) {
// NOTE(cdata): if we are in ShadowDOM land, `event.target` will
// eventually become `this` due to retargeting; if we are not in
// ShadowDOM land, `event.target` will eventually become `this` due
// to the second conditional which fires a synthetic event (that is also
// handled). In either case, we can disregard `event.path`.
if (event.target === this) {
this._setFocused(event.type === 'focus');
} else if (!this.shadowRoot && !this.isLightDescendant(event.target)) {
this.fire(event.type, {sourceEvent: event}, {
node: this,
bubbles: event.bubbles,
cancelable: event.cancelable
});
}
},
_disabledChanged: function(disabled, old) {
this.setAttribute('aria-disabled', disabled ? 'true' : 'false');
this.style.pointerEvents = disabled ? 'none' : '';
if (disabled) {
this._oldTabIndex = this.tabIndex;
this.focused = false;
this.tabIndex = -1;
} else if (this._oldTabIndex !== undefined) {
this.tabIndex = this._oldTabIndex;
}
},
_changedControlState: function() {
// _controlStateChanged is abstract, follow-on behaviors may implement it
if (this._controlStateChanged) {
this._controlStateChanged();
}
}
};
</script>