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> |