Index: third_party/polymer/components-chromium/core-a11y-keys/core-a11y-keys.html |
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-<!-- |
- @license |
- Copyright (c) 2014 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 |
---><!-- |
-`core-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: |
- |
- <core-a11y-keys target="{{}}" keys="up down left right" on-keys-pressed="{{arrowHandler}}"></core-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 `<core-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): |
- |
- <core-a11y-keys target="{{}}" keys="left pagedown down" on-keys-pressed="{{decrement}}"></core-a11y-keys> |
- <core-a11y-keys target="{{}}" keys="right pageup up" on-keys-pressed="{{increment}}"></core-a11y-keys> |
- <core-a11y-keys target="{{}}" keys="home" on-keys-pressed="{{setMin}}"></core-a11y-keys> |
- <core-a11y-keys target="{{}}" keys="end" on-keys-pressed="{{setMax}}"></core-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 } ; |
- |
-@group Core Elements |
-@element core-a11y-keys |
-@homepage github.io |
---><html><head><link rel="import" href="../polymer/polymer.html"> |
- |
-<style shim-shadowdom=""> |
- html /deep/ core-a11y-keys { |
- display: none; |
- } |
-</style> |
- |
-</head><body><polymer-element name="core-a11y-keys" assetpath=""> |
- |
-</polymer-element> |
-<script charset="utf-8" src="core-a11y-keys-extracted.js"></script></body></html> |