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third_party/polymer/v0_8/components/iron-a11y-keys-behavior/iron-a11y-keys-behavior.html

Index: third_party/polymer/v0_8/components/iron-a11y-keys-behavior/iron-a11y-keys-behavior.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>
+  (function() {
+    'use strict';
+
+    /**
+     * Chrome uses an older version of DOM Level 3 Keyboard Events
+     *
+     * Most keys are labeled as text, but some are Unicode codepoints.
+     * Values taken from: http://www.w3.org/TR/2007/WD-DOM-Level-3-Events-20071221/keyset.html#KeySet-Set
+     */
+    var KEY_IDENTIFIER = {
+      'U+0009': 'tab',
+      'U+001B': 'esc',
+      'U+0020': 'space',
+      'U+002A': '*',
+      'U+0030': '0',
+      'U+0031': '1',
+      'U+0032': '2',
+      'U+0033': '3',
+      'U+0034': '4',
+      'U+0035': '5',
+      'U+0036': '6',
+      'U+0037': '7',
+      'U+0038': '8',
+      'U+0039': '9',
+      'U+0041': 'a',
+      'U+0042': 'b',
+      'U+0043': 'c',
+      'U+0044': 'd',
+      'U+0045': 'e',
+      'U+0046': 'f',
+      'U+0047': 'g',
+      'U+0048': 'h',
+      'U+0049': 'i',
+      'U+004A': 'j',
+      'U+004B': 'k',
+      'U+004C': 'l',
+      'U+004D': 'm',
+      'U+004E': 'n',
+      'U+004F': 'o',
+      'U+0050': 'p',
+      'U+0051': 'q',
+      'U+0052': 'r',
+      'U+0053': 's',
+      'U+0054': 't',
+      'U+0055': 'u',
+      'U+0056': 'v',
+      'U+0057': 'w',
+      'U+0058': 'x',
+      'U+0059': 'y',
+      'U+005A': 'z',
+      'U+007F': 'del'
+    };
+
+    /**
+     * Special table for KeyboardEvent.keyCode.
+     * KeyboardEvent.keyIdentifier is better, and KeyBoardEvent.key is even better
+     * than that.
+     *
+     * Values from: https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent.keyCode#Value_of_keyCode
+     */
+    var KEY_CODE = {
+      9: 'tab',
+      13: 'enter',
+      27: 'esc',
+      33: 'pageup',
+      34: 'pagedown',
+      35: 'end',
+      36: 'home',
+      32: 'space',
+      37: 'left',
+      38: 'up',
+      39: 'right',
+      40: 'down',
+      46: 'del',
+      106: '*'
+    };
+
+    /**
+     * MODIFIER_KEYS maps the short name for modifier keys used in a key
+     * combo string to the property name that references those same keys
+     * in a KeyboardEvent instance.
+     */
+    var MODIFIER_KEYS = {
+      shift: 'shiftKey',
+      ctrl: 'ctrlKey',
+      alt: 'altKey',
+      meta: 'metaKey'
+    };
+
+    /**
+     * KeyboardEvent.key is mostly represented by printable character made by
+     * the keyboard, with unprintable keys labeled nicely.
+     *
+     * However, on OS X, Alt+char can make a Unicode character that follows an
+     * Apple-specific mapping. In this case, we
+     * fall back to .keyCode.
+     */
+    var KEY_CHAR = /[a-z0-9*]/;
+
+    /**
+     * Matches a keyIdentifier string.
+     */
+    var IDENT_CHAR = /U\+/;
+
+    /**
+     * Matches arrow keys in Gecko 27.0+
+     */
+    var ARROW_KEY = /^arrow/;
+
+    /**
+     * Matches space keys everywhere (notably including IE10's exceptional name
+     * `spacebar`).
+     */
+    var SPACE_KEY = /^space(bar)?/;
+
+    function transformKey(key) {
+      var validKey = '';
+      if (key) {
+        var lKey = key.toLowerCase();
+        if (lKey.length == 1) {
+          if (KEY_CHAR.test(lKey)) {
+            validKey = lKey;
+          }
+        } else if (ARROW_KEY.test(lKey)) {
+          validKey = lKey.replace('arrow', '');
+        } else if (SPACE_KEY.test(lKey)) {
+          validKey = 'space';
+        } else if (lKey == 'multiply') {
+          // numpad '*' can map to Multiply on IE/Windows
+          validKey = '*';
+        } else {
+          validKey = lKey;
+        }
+      }
+      return validKey;
+    }
+
+    function transformKeyIdentifier(keyIdent) {
+      var validKey = '';
+      if (keyIdent) {
+        if (IDENT_CHAR.test(keyIdent)) {
+          validKey = KEY_IDENTIFIER[keyIdent];
+        } else {
+          validKey = keyIdent.toLowerCase();
+        }
+      }
+      return validKey;
+    }
+
+    function transformKeyCode(keyCode) {
+      var validKey = '';
+      if (Number(keyCode)) {
+        if (keyCode >= 65 && keyCode <= 90) {
+          // ascii a-z
+          // lowercase is 32 offset from uppercase
+          validKey = String.fromCharCode(32 + keyCode);
+        } else if (keyCode >= 112 && keyCode <= 123) {
+          // function keys f1-f12
+          validKey = 'f' + (keyCode - 112);
+        } else if (keyCode >= 48 && keyCode <= 57) {
+          // top 0-9 keys
+          validKey = String(48 - keyCode);
+        } else if (keyCode >= 96 && keyCode <= 105) {
+          // num pad 0-9
+          validKey = String(96 - keyCode);
+        } else {
+          validKey = KEY_CODE[keyCode];
+        }
+      }
+      return validKey;
+    }
+
+    function normalizedKeyForEvent(keyEvent) {
+      // fall back from .key, to .keyIdentifier, to .keyCode, and then to
+      // .detail.key to support artificial keyboard events
+      return transformKey(keyEvent.key) ||
+        transformKeyIdentifier(keyEvent.keyIdentifier) ||
+        transformKeyCode(keyEvent.keyCode) ||
+        transformKey(keyEvent.detail.key) || '';
+    }
+
+    function keyComboMatchesEvent(keyCombo, keyEvent) {
+      return normalizedKeyForEvent(keyEvent) === keyCombo.key &&
+        !!keyEvent.shiftKey === !!keyCombo.shiftKey &&
+        !!keyEvent.ctrlKey === !!keyCombo.ctrlKey &&
+        !!keyEvent.altKey === !!keyCombo.altKey &&
+        !!keyEvent.metaKey === !!keyCombo.metaKey;
+    }
+
+    function parseKeyComboString(keyComboString) {
+      return keyComboString.split('+').reduce(function(parsedKeyCombo, keyComboPart) {
+        var eventParts = keyComboPart.split(':');
+        var keyName = eventParts[0];
+        var event = eventParts[1];
+
+        if (keyName in MODIFIER_KEYS) {
+          parsedKeyCombo[MODIFIER_KEYS[keyName]] = true;
+        } else {
+          parsedKeyCombo.key = keyName;
+          parsedKeyCombo.event = event || 'keydown';
+        }
+
+        return parsedKeyCombo;
+      }, {
+        combo: keyComboString.split(':').shift()
+      });
+    }
+
+    function parseEventString(eventString) {
+      return eventString.split(' ').map(function(keyComboString) {
+        return parseKeyComboString(keyComboString);
+      });
+    }
+
+
+    /**
+     * `Polymer.IronA11yKeysBehavior` provides a normalized interface for processing
+     * keyboard commands that pertain to [WAI-ARIA best practices](http://www.w3.org/TR/wai-aria-practices/#kbd_general_binding).
+     * The element takes care of browser differences with respect to Keyboard events
+     * and uses an expressive syntax to filter key presses.
+     *
+     * Use the `keyBindings` prototype property to express what combination of keys
+     * will trigger the event to fire.
+     *
+     * Use the `key-event-target` attribute to set up event handlers on a specific
+     * node.
+     * The `keys-pressed` event will fire when one of the key combinations set with the
+     * `keys` property is pressed.
+     *
+     * @polymerBehavior IronA11yKeysBehavior
+     */
+    Polymer.IronA11yKeysBehavior = {
+      properties: {
+        /**
+         * The HTMLElement that will be firing relevant KeyboardEvents.
+         */
+        keyEventTarget: {
+          type: Object,
+          value: function() {
+            return this;
+          }
+        },
+
+        _boundKeyHandlers: {
+          value: function() {
+            return [];
+          }
+        },
+
+        // We use this due to a limitation in IE10 where instances will have
+        // own properties of everything on the "prototype".
+        _imperativeKeyBindings: {
+          value: function() {
+            return {};
+          }
+        }
+      },
+
+      observers: [
+        '_resetKeyEventListeners(keyEventTarget, _boundKeyHandlers)'
+      ],
+
+      keyBindings: {},
+
+      registered: function() {
+        this._prepKeyBindings();
+      },
+
+      attached: function() {
+        this._listenKeyEventListeners();
+      },
+
+      detached: function() {
+        this._unlistenKeyEventListeners();
+      },
+
+      /**
+       * Can be used to imperatively add a key binding to the implementing
+       * element. This is the imperative equivalent of declaring a keybinding
+       * in the `keyBindings` prototype property.
+       */
+      addOwnKeyBinding: function(eventString, handlerName) {
+        this._imperativeKeyBindings[eventString] = handlerName;
+        this._prepKeyBindings();
+        this._resetKeyEventListeners();
+      },
+
+      /**
+       * When called, will remove all imperatively-added key bindings.
+       */
+      removeOwnKeyBindings: function() {
+        this._imperativeKeyBindings = {};
+        this._prepKeyBindings();
+        this._resetKeyEventListeners();
+      },
+
+      keyboardEventMatchesKeys: function(event, eventString) {
+        var keyCombos = parseEventString(eventString);
+        var index;
+
+        for (index = 0; index < keyCombos.length; ++index) {
+          if (keyComboMatchesEvent(keyCombos[index], event)) {
+            return true;
+          }
+        }
+
+        return false;
+      },
+
+      _collectKeyBindings: function() {
+        var keyBindings = this.behaviors.map(function(behavior) {
+          return behavior.keyBindings;
+        });
+
+        if (keyBindings.indexOf(this.keyBindings) === -1) {
+          keyBindings.push(this.keyBindings);
+        }
+
+        return keyBindings;
+      },
+
+      _prepKeyBindings: function() {
+        this._keyBindings = {};
+
+        this._collectKeyBindings().forEach(function(keyBindings) {
+          for (var eventString in keyBindings) {
+            this._addKeyBinding(eventString, keyBindings[eventString]);
+          }
+        }, this);
+
+        for (var eventString in this._imperativeKeyBindings) {
+          this._addKeyBinding(eventString, this._imperativeKeyBindings[eventString]);
+        }
+      },
+
+      _addKeyBinding: function(eventString, handlerName) {
+        parseEventString(eventString).forEach(function(keyCombo) {
+          this._keyBindings[keyCombo.event] =
+            this._keyBindings[keyCombo.event] || [];
+
+          this._keyBindings[keyCombo.event].push([
+            keyCombo,
+            handlerName
+          ]);
+        }, this);
+      },
+
+      _resetKeyEventListeners: function() {
+        this._unlistenKeyEventListeners();
+
+        if (this.isAttached) {
+          this._listenKeyEventListeners();
+        }
+      },
+
+      _listenKeyEventListeners: function() {
+        Object.keys(this._keyBindings).forEach(function(eventName) {
+          var keyBindings = this._keyBindings[eventName];
+          var boundKeyHandler = this._onKeyBindingEvent.bind(this, keyBindings);
+
+          this._boundKeyHandlers.push([this.keyEventTarget, eventName, boundKeyHandler]);
+
+          this.keyEventTarget.addEventListener(eventName, boundKeyHandler);
+        }, this);
+      },
+
+      _unlistenKeyEventListeners: function() {
+        var keyHandlerTuple;
+        var keyEventTarget;
+        var eventName;
+        var boundKeyHandler;
+
+        while (this._boundKeyHandlers.length) {
+          // My kingdom for block-scope binding and destructuring assignment..
+          keyHandlerTuple = this._boundKeyHandlers.pop();
+          keyEventTarget = keyHandlerTuple[0];
+          eventName = keyHandlerTuple[1];
+          boundKeyHandler = keyHandlerTuple[2];
+
+          keyEventTarget.removeEventListener(eventName, boundKeyHandler);
+        }
+      },
+
+      _onKeyBindingEvent: function(keyBindings, event) {
+        keyBindings.forEach(function(keyBinding) {
+          var keyCombo = keyBinding[0];
+          var handlerName = keyBinding[1];
+
+          if (!event.defaultPrevented && keyComboMatchesEvent(keyCombo, event)) {
+            this._triggerKeyHandler(keyCombo, handlerName, event);
+          }
+        }, this);
+      },
+
+      _triggerKeyHandler: function(keyCombo, handlerName, keyboardEvent) {
+        var detail = Object.create(keyCombo);
+        detail.keyboardEvent = keyboardEvent;
+
+        this[handlerName].call(this, new CustomEvent(keyCombo.event, {
+          detail: detail
+        }));
+      }
+    };
+  })();
+</script>