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<!--
-- Copyright (c) 2013 The Chromium Authors. All rights reserved.
-- Use of this source code is governed by a BSD-style license that can be
-- found in the LICENSE file.
-->
<element name="kb-keyboard" on-key-over="keyOver" on-key-up="keyUp"
on-key-down="keyDown" attributes="keyset rows">
<template>
<content select="#{{keyset}}"></content>
</template>
<script>
/**
* The long-press delay in milliseconds before long-press handler is
* invoked.
* @type {number}
*/
var LONGPRESS_DELAY_MSEC = 500;
/**
* The repeat delay in milliseconds before a key starts repeating. Use the
* same rate as Chromebook.
* (See chrome/browser/chromeos/language_preferences.cc)
* @type {number}
*/
var REPEAT_DELAY_MSEC = 500;
/**
* The repeat interval or number of milliseconds between subsequent
* keypresses. Use the same rate as Chromebook.
* @type {number}
*/
var REPEAT_INTERVAL_MSEC = 50;
/**
* The boolean to decide if keyboard should transit to upper case keyset
* when spacebar is pressed. If a closing punctuation is followed by a
* spacebar, keyboard should automatically transit to upper case.
* @type {boolean}
*/
var enterUpperOnSpace = false;
/**
* A structure to track the currently repeating key on the keyboard.
*/
var repeatKey = {
/**
* The timer for the delay before repeating behaviour begins.
* @type {number|undefined}
*/
timer: undefined,
/**
* The interval timer for issuing keypresses of a repeating key.
* @type {number|undefined}
*/
interval: undefined,
/**
* The key which is currently repeating.
* @type {BaseKey|undefined}
*/
key: undefined,
/**
* Cancel the repeat timers of the currently active key.
*/
cancel: function() {
clearTimeout(this.timer);
clearInterval(this.interval);
this.timer = undefined;
this.interval = undefined;
this.key = undefined;
}
};
Polymer.register(this, {
lastPressedKey: null,
voiceInput_: null,
ready: function() {
this.voiceInput_ = new VoiceInput(this);
},
/**
* Handles key-down event that is sent by kb-key.
* @param {CustomEvent} event The key-down event dispatched by kb-key.
* @param {Object} detail The detail of pressed kb-key.
*/
keyDown: function(event, detail) {
var toKeyset = detail.toKeyset;
if (this.lastPressedKey)
this.lastPressedKey.classList.remove('active');
this.lastPressedKey = event.target;
this.lastPressedKey.classList.add('active');
repeatKey.cancel();
if (detail.repeat) {
sendKey(detail.char);
repeatKey.key = this.lastPressedKey;
repeatKey.timer = setTimeout(function() {
repeatKey.timer = undefined;
repeatKey.interval = setInterval(function() {
sendKey(detail.char);
}, REPEAT_INTERVAL_MSEC);
}, Math.max(0, REPEAT_DELAY_MSEC - REPEAT_INTERVAL_MSEC));
}
},
/**
* Handles key-up event that is sent by kb-key.
* @param {CustomEvent} event The key-up event dispatched by kb-key.
* @param {Object} detail The detail of pressed kb-key.
*/
keyUp: function(event, detail) {
this.lastPressedKey.classList.remove('active');
if (this.lastPressedKey != event.target)
return;
if (repeatKey.key == event.target) {
repeatKey.cancel();
return;
}
var toKeyset = detail.toKeyset;
// Keyset transtion key.
if (toKeyset) {
this.keyset = toKeyset;
}
var char = detail.char;
if (enterUpperOnSpace) {
enterUpperOnSpace = false;
if (char == 'Spacebar')
this.keyset = 'upper';
}
switch(char) {
case 'Invalid':
return;
case 'Mic':
this.voiceInput_.onDown();
return;
case '.':
case '?':
case '!':
enterUpperOnSpace = true;
break;
case 'Tab':
case 'Spacebar':
case 'Enter':
sendKey(char);
return;
default:
break;
}
for (var i = 0; i < char.length; i++) {
sendKey(char.charAt(i));
}
}
});
</script>
</element>
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