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// Copyright (c) 2011 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.
/**
* @fileoverview A simple virtual keyboard implementation.
*/
// TODO(mazda): Support more virtual keyboards like French VK, German VK, etc.
var KEYBOARDS = {
'us': {
'definition': KEYS_US,
'rows': []
// No canvas.
},
'handwriting-vk': {
'definition': KEYS_HANDWRITING_VK,
'rows': [],
// TODO(yusukes): Stop special-casing canvas when mazda's i18n keyboard
// code is ready.
'canvas': new HandwritingCanvas
}
};
/**
* The keyboard layout name currently in use.
* @type {string}
*/
var currentKeyboardLayout = 'us';
/**
* The keyboard's aspect ratio.
* @type {number}
*/
var kKeyboardAspect = 3.3;
/**
* Calculate the height of the row based on the size of the page.
* @return {number} The height of each row, in pixels.
*/
function getRowHeight() {
var x = window.innerWidth;
var y = window.innerHeight - ((imeui && imeui.visible) ? IME_HEIGHT : 0);
return (x > kKeyboardAspect * y) ?
(height = Math.floor(y / 4)) :
(height = Math.floor(x / (kKeyboardAspect * 4)));
}
/**
* Set the keyboard mode.
* @param {string} mode The new mode.
* @return {void}
*/
function setMode(mode) {
var rows = KEYBOARDS[currentKeyboardLayout]['rows'];
for (var i = 0; i < rows.length; ++i) {
rows[i].showMode(mode);
}
}
var oldHeight = 0;
var oldX = 0;
var oldAspect = 0;
/**
* Resize the keyboard according to the new window size.
* @return {void}
*/
window.onresize = function() {
var height = getRowHeight();
var newX = document.documentElement.clientWidth;
// All rows of the current keyboard should have the same aspect, so just use
// the first row.
var newAspect = KEYBOARDS[currentKeyboardLayout]['rows'][0].aspect;
if (newX != oldX || height != oldHeight || newAspect != oldAspect) {
var totalWidth = Math.floor(height * newAspect);
var leftPadding = Math.floor((newX - totalWidth) / 2);
document.getElementById('b').style.paddingLeft = leftPadding + 'px';
}
if (height != oldHeight || newAspect != oldAspect) {
var rows = KEYBOARDS[currentKeyboardLayout]['rows'];
for (var i = 0; i < rows.length; ++i) {
rows[i].resize(height);
}
var canvas = KEYBOARDS[currentKeyboardLayout]['canvas'];
if (canvas !== undefined) {
var canvasHeight = (height - 2 /* overlapped margin*/) * rows.length;
canvas.resize(canvasHeight);
}
}
updateIme();
oldHeight = height;
oldX = newX;
oldAspect = newAspect;
}
/**
* Init the keyboard.
* @return {void}
*/
window.onload = function() {
var body = document.getElementById('b');
initIme(body);
var mainDiv = document.createElement('div');
mainDiv.className = 'main';
body.appendChild(mainDiv);
// TODO(mazda,yusukes): If we support 40+ virtual keyboards, it's not a good
// idea to create rows (and DOM) for all keyboards inside onload(). We should
// do it on an on-demand basis instead.
for (var layout in KEYBOARDS) {
var keyboard = KEYBOARDS[layout];
var def = keyboard['definition'];
var rows = keyboard['rows'];
for (var i = 0; i < def.length; ++i) {
rows.push(new Row(i, def[i]));
}
}
height = getRowHeight();
// A div element which holds canvases for all keyboards layouts.
var canvasesDiv = document.createElement('div');
canvasesDiv.className = 'canvas';
for (var layout in KEYBOARDS) {
// A div element which holds rows for the layout.
var rowsDiv = document.createElement('div');
var rows = KEYBOARDS[layout]['rows'];
for (var i = 0; i < rows.length; ++i) {
rowsDiv.appendChild(rows[i].makeDOM(height));
rows[i].showMode(KEY_MODE);
}
rowsDiv.hidden = true;
mainDiv.appendChild(rowsDiv);
KEYBOARDS[layout]['rowsDiv'] = rowsDiv;
var canvas = KEYBOARDS[layout]['canvas'];
if (canvas !== undefined) {
canvas.visible = false;
var canvasHeight = (height - 2 /* overlapped margin*/) * rows.length;
canvas.resize(canvasHeight);
canvasesDiv.appendChild(canvas);
}
}
mainDiv.appendChild(canvasesDiv);
oldHeight = height;
window.onhashchange();
// Restore the keyboard to the default state when it is hidden.
// Ref: dvcs.w3.org/hg/webperf/raw-file/tip/specs/PageVisibility/Overview.html
document.addEventListener("webkitvisibilitychange", function() {
if (document.webkitHidden) {
currentMode = KEY_MODE;
setMode(currentMode);
}
}, false);
}
// TODO(bryeung): would be nice to leave less gutter (without causing
// rendering issues with floated divs wrapping at some sizes).
/**
* Switch the keyboard layout based on the current URL hash.
* @return {void}
*/
window.onhashchange = function() {
var old_layout = currentKeyboardLayout;
var new_layout = location.hash.replace(/^#/, "");
if (KEYBOARDS[new_layout] === undefined) {
// Unsupported layout.
new_layout = "us";
}
currentKeyboardLayout = new_layout;
[new_layout, old_layout].forEach(function(layout) {
var visible = (layout == new_layout);
var canvas = KEYBOARDS[layout]['canvas'];
var rowsDiv = KEYBOARDS[layout]['rowsDiv'];
rowsDiv.hidden = !visible;
if (canvas !== undefined) {
canvas.visible = visible;
if (!visible) {
canvas.clear();
}
}
if (visible) {
window.onresize();
}
});
}
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