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

Index: third_party/polymer/v0_8/components/iron-a11y-keys/iron-a11y-keys.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
+The complete set of authors may be found at http://polymer.github.io/AUTHORS
+The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS
+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
+-->
+
+<link rel="import" href="../polymer/polymer.html">
+<link rel="import" href="../iron-a11y-keys-behavior/iron-a11y-keys-behavior.html">
+
+
+<script>
+
+/*
+`iron-a11y-keys` 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 `keys` attribute to express what combination of keys will trigger the event to fire.
+
+Use the `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` attribute is pressed.
+
+Example:
+
+This element will call `arrowHandler` on all arrow keys:
+
+    <iron-a11y-keys target="{{}}" keys="up down left right" on-keys-pressed="{{arrowHandler}}"></iron-a11y-keys>
+
+Keys Syntax:
+
+The `keys` attribute can accepts a space seprated, `+` concatenated set of modifier keys and some common keyboard keys.
+
+The common keys are `a-z`, `0-9` (top row and number pad), `*` (shift 8 and number pad), `F1-F12`, `Page Up`, `Page
+Down`, `Left Arrow`, `Right Arrow`, `Down Arrow`, `Up Arrow`, `Home`, `End`, `Escape`, `Space`, `Tab`, and `Enter` keys.
+
+The modifier keys are `Shift`, `Control`, and `Alt`.
+
+All keys are expected to be lowercase and shortened:
+`Left Arrow` is `left`, `Page Down` is `pagedown`, `Control` is `ctrl`, `F1` is `f1`, `Escape` is `esc` etc.
+
+Keys Syntax Example:
+
+Given the `keys` attribute value "ctrl+shift+f7 up pagedown esc space alt+m", the `<iron-a11y-keys>` element will send
+the `keys-pressed` event if any of the follow key combos are pressed: Control and Shift and F7 keys, Up Arrow key, Page
+Down key, Escape key, Space key, Alt and M key.
+
+Slider Example:
+
+The following is an example of the set of keys that fulfil the WAI-ARIA "slider" role [best
+practices](http://www.w3.org/TR/wai-aria-practices/#slider):
+
+    <iron-a11y-keys target="{{}}" keys="left pagedown down" on-keys-pressed="{{decrement}}"></iron-a11y-keys>
+    <iron-a11y-keys target="{{}}" keys="right pageup up" on-keys-pressed="{{increment}}"></iron-a11y-keys>
+    <iron-a11y-keys target="{{}}" keys="home" on-keys-pressed="{{setMin}}"></iron-a11y-keys>
+    <iron-a11y-keys target="{{}}" keys="end" on-keys-pressed="{{setMax}}"></iron-a11y-keys>
+
+The `increment` function will move the slider a set amount toward the maximum value.
+The `decrement` function will move the slider a set amount toward the minimum value.
+The `setMin` function will move the slider to the minimum value.
+The `setMax` function will move the slider to the maximum value.
+
+Keys Syntax Grammar:
+
+[EBNF](http://en.wikipedia.org/wiki/Extended_Backus%E2%80%93Naur_Form) Grammar of the `keys` attribute.
+
+    modifier = "shift" | "ctrl" | "alt";
+    ascii = ? /[a-z0-9]/ ? ;
+    fnkey = ? f1 through f12 ? ;
+    arrow = "up" | "down" | "left" | "right" ;
+    key = "tab" | "esc" | "space" | "*" | "pageup" | "pagedown" | "home" | "end" | arrow | ascii | fnkey ;
+    keycombo = { modifier, "+" }, key ;
+    keys = keycombo, { " ", keycombo } ;
+
+@demo demo/index.html
+*/
+
+
+  Polymer({
+    is: 'iron-a11y-keys',
+
+    behaviors: [
+      Polymer.IronA11yKeysBehavior
+    ],
+
+    properties: {
+      target: {
+        type: Object,
+        observer: '_targetChanged'
+      },
+
+      keys: {
+        type: String,
+        reflectToAttribute: true,
+        observer: '_keysChanged'
+      }
+    },
+
+    attached: function() {
+      if (!this.target) {
+        this.target = this.parentNode;
+      }
+    },
+
+    _targetChanged: function(target) {
+      this.keyEventTarget = target;
+    },
+
+    _keysChanged: function() {
+      this.removeOwnKeyBindings();
+      this.addOwnKeyBinding(this.keys, '_fireKeysPressed');
+    },
+
+    _fireKeysPressed: function(event) {
+      this.fire('keys-pressed', event.detail, {});
+    }
+  });
+</script>