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bower_components/iron-behaviors/iron-button-state.html 5.23 KB
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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-a11y-keys-behavior/iron-a11y-keys-behavior.html">
  <link rel="import" href="iron-control-state.html">
  
  <script>
  
    /**
     * @demo demo/index.html
     * @polymerBehavior Polymer.IronButtonState
     */
    Polymer.IronButtonStateImpl = {
  
      properties: {
  
        /**
         * If true, the user is currently holding down the button.
         */
        pressed: {
          type: Boolean,
          readOnly: true,
          value: false,
          reflectToAttribute: true,
          observer: '_pressedChanged'
        },
  
        /**
         * If true, the button toggles the active state with each tap or press
         * of the spacebar.
         */
        toggles: {
          type: Boolean,
          value: false,
          reflectToAttribute: true
        },
  
        /**
         * If true, the button is a toggle and is currently in the active state.
         */
        active: {
          type: Boolean,
          value: false,
          notify: true,
          reflectToAttribute: true
        },
  
        /**
         * True if the element is currently being pressed by a "pointer," which
         * is loosely defined as mouse or touch input (but specifically excluding
         * keyboard input).
         */
        pointerDown: {
          type: Boolean,
          readOnly: true,
          value: false
        },
  
        /**
         * True if the input device that caused the element to receive focus
         * was a keyboard.
         */
        receivedFocusFromKeyboard: {
          type: Boolean,
          readOnly: true
        },
  
        /**
         * The aria attribute to be set if the button is a toggle and in the
         * active state.
         */
        ariaActiveAttribute: {
          type: String,
          value: 'aria-pressed',
          observer: '_ariaActiveAttributeChanged'
        }
      },
  
      listeners: {
        down: '_downHandler',
        up: '_upHandler',
        tap: '_tapHandler'
      },
  
      observers: [
        '_detectKeyboardFocus(focused)',
        '_activeChanged(active, ariaActiveAttribute)'
      ],
  
      keyBindings: {
        'enter:keydown': '_asyncClick',
        'space:keydown': '_spaceKeyDownHandler',
        'space:keyup': '_spaceKeyUpHandler',
      },
  
      _mouseEventRe: /^mouse/,
  
      _tapHandler: function() {
        if (this.toggles) {
         // a tap is needed to toggle the active state
          this._userActivate(!this.active);
        } else {
          this.active = false;
        }
      },
  
      _detectKeyboardFocus: function(focused) {
        this._setReceivedFocusFromKeyboard(!this.pointerDown && focused);
      },
  
      // to emulate native checkbox, (de-)activations from a user interaction fire
      // 'change' events
      _userActivate: function(active) {
        if (this.active !== active) {
          this.active = active;
          this.fire('change');
        }
      },
  
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      _downHandler: function(event) {
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        this._setPointerDown(true);
        this._setPressed(true);
        this._setReceivedFocusFromKeyboard(false);
      },
  
      _upHandler: function() {
        this._setPointerDown(false);
        this._setPressed(false);
      },
  
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      _spaceKeyDownHandler: function(event) {
        var keyboardEvent = event.detail.keyboardEvent;
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        keyboardEvent.preventDefault();
        keyboardEvent.stopImmediatePropagation();
        this._setPressed(true);
      },
  
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      _spaceKeyUpHandler: function() {
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        if (this.pressed) {
          this._asyncClick();
        }
        this._setPressed(false);
      },
  
      // trigger click asynchronously, the asynchrony is useful to allow one
      // event handler to unwind before triggering another event
      _asyncClick: function() {
        this.async(function() {
          this.click();
        }, 1);
      },
  
      // any of these changes are considered a change to button state
  
      _pressedChanged: function(pressed) {
        this._changedButtonState();
      },
  
      _ariaActiveAttributeChanged: function(value, oldValue) {
        if (oldValue && oldValue != value && this.hasAttribute(oldValue)) {
          this.removeAttribute(oldValue);
        }
      },
  
      _activeChanged: function(active, ariaActiveAttribute) {
        if (this.toggles) {
          this.setAttribute(this.ariaActiveAttribute,
                            active ? 'true' : 'false');
        } else {
          this.removeAttribute(this.ariaActiveAttribute);
        }
        this._changedButtonState();
      },
  
      _controlStateChanged: function() {
        if (this.disabled) {
          this._setPressed(false);
        } else {
          this._changedButtonState();
        }
      },
  
      // provide hook for follow-on behaviors to react to button-state
  
      _changedButtonState: function() {
        if (this._buttonStateChanged) {
          this._buttonStateChanged(); // abstract
        }
      }
  
    };
  
    /** @polymerBehavior */
    Polymer.IronButtonState = [
      Polymer.IronA11yKeysBehavior,
      Polymer.IronButtonStateImpl
    ];
  
  </script>