Implement DOM UI version of keyboard overlay.

chrome/browser/resources/keyboard_overlay.js

Index: chrome/browser/resources/keyboard_overlay.js
diff --git a/chrome/browser/resources/keyboard_overlay.js b/chrome/browser/resources/keyboard_overlay.js
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+// Copyright (c) 2010 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.
+
+var BASE_KEYBOARD = {
+  top: 0,
+  left: 0,
+  width: 1237,
+  height: 468
+};
+
+var BASE_INSTRUCTIONS = {
+  top: 174,
+  left: 370,
+  width: 498,
+  height: 81
+};
+
+var LABEL_TO_KEY_TEXT = {
+  alt: 'alt',
+  backspace: 'backspace',
+  ctrl: 'ctrl',
+  enter: 'enter',
+  esc: 'esc',
+  glyph_arrow_down: 'down',
+  glyph_arrow_left: 'left',
+  glyph_arrow_right: 'right',
+  glyph_arrow_up: 'up',
+  glyph_back: 'back',
+  glyph_backspace: 'backspace',
+  glyph_brightness_down: 'bright down',
+  glyph_brightness_up: 'bright up',
+  glyph_enter: 'enter',
+  glyph_forward: 'forward',
+  glyph_fullscreen: 'fullscreen',
+  glyph_overview: 'windows',
+  glyph_power: 'power',
+  glyph_reload: 'reload',
+  glyph_reload: 'reload',
+  glyph_search: 'search',
+  glyph_tab: 'tab',
+  glyph_tools: 'tools',
+  glyph_volume_down: 'vol. down',
+  glyph_volume_mute: 'mute',
+  glyph_volume_up: 'vol. up',
+  shift: 'shift',
+  tab: 'tab'
+};
+
+var MODIFIER_TO_CLASS = {
+  'SHIFT': 'modifier-shift',
+  'CTRL': 'modifier-ctrl',
+  'ALT': 'modifier-alt'
+};
+
+var IDENTIFIER_TO_CLASS = {
+  '2A': 'is-shift',
+  '1D': 'is-ctrl',
+  '38': 'is-alt'
+};
+
+var languageCode = 'en_US';
+
+/**
+ * Returns layouts data.
+ */
+function getLayouts() {
+  return keyboardOverlayData['layouts'];
+}
+
+/**
+ * Returns shortcut data.
+ */
+function getShortcutData() {
+  return keyboardOverlayData['shortcut'];
+}
+
+/**
+ * Returns the language code of the system.
+ */
+function getLanguageCode() {
+  // TODO(mazda): Retrieve the language code from the system.
+  return languageCode;
+}
+
+/**
+ * Returns keyboard glyph data.
+ */
+function getKeyboardGlyphData() {
+  return keyboardOverlayData['keyboardGlyph'][getLanguageCode()];
+}
+
+/**
+ * Converts a single hex number to a character.
+ */
+function hex2char(hex) {
+  if (!hex) {
+    return '';
+  }
+  var result = '';
+  var n = parseInt(hex, 16);
+  if (n <= 0xFFFF) {
+    result += String.fromCharCode(n);
+  } else if (n <= 0x10FFFF) {
+    n -= 0x10000;
+    result += (String.fromCharCode(0xD800 | (n >> 10)) +
+               String.fromCharCode(0xDC00 | (n & 0x3FF)));
+  } else {
+    console.error('hex2Char error: Code point out of range :' + hex);
+  }
+  return result;
+}
+
+/**
+ * Returns a list of modifiers from the key event.
+ */
+function getModifiers(e) {
+  if (!e) {
+    return [];
+  }
+  var modifiers = [];
+  if (e.keyCode == 16 || e.shiftKey) {
+    modifiers.push('SHIFT');
+  }
+  if (e.keyCode == 17 || e.ctrlKey) {
+    modifiers.push('CTRL');
+  }
+  if (e.keyCode == 18 || e.altKey) {
+    modifiers.push('ALT');
+  }
+  return modifiers.sort();
+}
+
+/**
+ * Returns an ID of the key.
+ */
+function keyId(identifier, i) {
+  return identifier + '-key-' + i;
+}
+
+/**
+ * Returns an ID of the text on the key.
+ */
+function keyTextId(identifier, i) {
+  return identifier + '-key-text-' + i;
+}
+
+/**
+ * Returns an ID of the shortcut text.
+ */
+function shortcutTextId(identifier, i) {
+  return identifier + '-shortcut-text-' + i;
+}
+
+/**
+ * Returns true if |list| contains |e|.
+ */
+function contains(list, e) {
+  return list.indexOf(e) != -1;
+}
+
+/**
+ * Returns a list of the class names corresponding to the identifier and
+ * modifiers.
+ */
+function getKeyClasses(identifier, modifiers) {
+  var classes = ['keyboard-overlay-key'];
+  for (var i = 0; i < modifiers.length; ++i) {
+    classes.push(MODIFIER_TO_CLASS[modifiers[i]]);
+  }
+
+  if ((identifier == '2A' && contains(modifiers, 'SHIFT')) ||
+      (identifier == '1D' && contains(modifiers, 'CTRL')) ||
+      (identifier == '38' && contains(modifiers, 'ALT'))) {
+    classes.push('pressed');
+    classes.push(IDENTIFIER_TO_CLASS[identifier]);
+  }
+  return classes;
+}
+
+/**
+ * Returns true if a character is a ASCII character.
+ */
+function isAscii(c) {
+  var charCode = c.charCodeAt(0);
+  return 0x00 <= charCode && charCode <= 0x7F;
+}
+
+/**
+ * Returns a label of the key.
+ */
+function getKeyLabel(keyData, modifiers) {
+  if (!keyData) {
+    return '';
+  }
+  if (keyData.label in LABEL_TO_KEY_TEXT) {
+    return LABEL_TO_KEY_TEXT[keyData.label];
+  }
+  var keyLabel = '';
+  for (var j = 1; j <= 9; j++) {
+    var pos =  keyData['p' + j];
+    if (!pos) {
+      continue;
+    }
+    if (LABEL_TO_KEY_TEXT[pos]) {
+      return LABEL_TO_KEY_TEXT[pos];
+    }
+    keyLabel = hex2char(pos);
+    if (!keyLabel) {
+      continue;
+     }
+    if (isAscii(keyLabel) &&
+        getShortcutData()[getAction(keyLabel, modifiers)]) {
+      break;
+    }
+  }
+  return keyLabel;
+}
+
+/**
+ * Returns a normalized string used for a key of shortcutData.
+ */
+function getAction(keycode, modifiers) {
+  return [keycode].concat(modifiers).join(' ');
+}
+
+/**
+ * Returns a text which displayed on a key.
+ */
+function getKeyTextValue(keyData) {
+  if (LABEL_TO_KEY_TEXT[keyData.label]) {
+    return LABEL_TO_KEY_TEXT[keyData.label];
+  }
+
+  var chars = [];
+  for (var j = 1; j <= 9; ++j) {
+    var pos = keyData['p' + j];
+    if (LABEL_TO_KEY_TEXT[pos]) {
+      return LABEL_TO_KEY_TEXT[pos];
+    }
+    if (pos && pos.length > 0) {
+      chars.push(hex2char(pos));
+    }
+  }
+  return chars.join(' ');
+}
+
+/**
+ * Updates the whole keyboard.
+ */
+function update(e) {
+  var modifiers = getModifiers(e);
+  var instructions = document.getElementById('instructions');
+  if (modifiers.length == 0) {
+    instructions.style.visibility = 'visible';
+  } else {
+    instructions.style.visibility = 'hidden';
+  }
+
+  var keyboardGlyphData = getKeyboardGlyphData();
+  var shortcutData = getShortcutData();
+  var layout = getLayouts()[keyboardGlyphData.layoutName];
+  for (var i = 0; i < layout.length; ++i) {
+    var identifier = layout[i][0];
+    var keyData = keyboardGlyphData.keys[identifier];
+    var classes = getKeyClasses(identifier, modifiers, keyData);
+    var keyLabel = getKeyLabel(keyData, modifiers);
+    var shortcutId = shortcutData[getAction(keyLabel, modifiers)];
+    if (shortcutId) {
+      classes.push('is-shortcut');
+    }
+
+    var key = document.getElementById(keyId(identifier, i));
+    key.className = classes.join(' ');
+
+    if (!keyData) {
+      continue;
+    }
+
+    var keyText = document.getElementById(keyTextId(identifier, i));
+    var keyTextValue = getKeyTextValue(keyData);
+    if (keyTextValue) {
+       keyText.style.visibility = 'visible';
+    } else {
+       keyText.style.visibility = 'hidden';
+    }
+    keyText.textContent = keyTextValue;
+
+    var shortcutText = document.getElementById(shortcutTextId(identifier, i));
+    if (shortcutId) {
+      shortcutText.style.visibility = 'visible';
+      shortcutText.textContent = templateData[shortcutId];
+    } else {
+      shortcutText.style.visibility = 'hidden';
+    }
+
+    if (keyData.format) {
+      var format = keyData.format;
+      if (format == 'left' || format == 'right') {
+        shortcutText.style.textAlign = format;
+        keyText.style.textAlign = format;
+      }
+    }
+  }
+}
+
+/**
+ * A callback furnction for the onkeydown event.
+ */
+function keydown(e) {
+  update(e);
+}
+
+/**
+ * A callback furnction for the onkeyup event.
+ */
+function keyup(e) {
+  update();
+}
+
+/**
+ * Initializes the layout of the keys.
+ */
+function initLayout() {
+  var layout = getLayouts()[getKeyboardGlyphData().layoutName];
+  var keyboard = document.body;
+  var minX = window.innerWidth;
+  var maxX = 0;
+  var minY = window.innerHeight;
+  var maxY = 0;
+  var multiplier = 1.38 * window.innerWidth / BASE_KEYBOARD.width;
+  var keyMargin = 7;
+  var offsetX = 10;
+  var offsetY = 7;
+  for (var i = 0; i < layout.length; i++) {
+    var array = layout[i];
+    var identifier = array[0];
+    var x = Math.round((array[1] + offsetX) * multiplier);
+    var y = Math.round((array[2] + offsetY) * multiplier);
+    var w = Math.round((array[3] - keyMargin) * multiplier);
+    var h = Math.round((array[4] - keyMargin) * multiplier);
+
+    var key = document.createElement('div');
+    key.id = keyId(identifier, i);
+    key.className = 'keyboard-overlay-key';
+    key.style.left = x + 'px';
+    key.style.top = y + 'px';
+    key.style.width = w + 'px';
+    key.style.height = h + 'px';
+
+    var keyText = document.createElement('div');
+    keyText.id = keyTextId(identifier, i);
+    keyText.className = 'keyboard-overlay-key-text';
+    keyText.style.visibility = 'hidden';
+    key.appendChild(keyText);
+
+    var shortcutText = document.createElement('div');
+    shortcutText.id = shortcutTextId(identifier, i);
+    shortcutText.className = 'keyboard-overlay-shortcut-text';
+    shortcutText.style.visilibity = 'hidden';
+    key.appendChild(shortcutText);
+    keyboard.appendChild(key);
+
+    minX = Math.min(minX, x);
+    maxX = Math.max(maxX, x + w);
+    minY = Math.min(minY, y);
+    maxY = Math.max(maxY, y + h);
+  }
+
+  var width = maxX - minX + 1;
+  var height = maxY - minY + 1;
+  keyboard.style.width = (width + 2 * (minX + 1)) + 'px';
+  keyboard.style.height = (height + 2 * (minY + 1)) + 'px';
+
+  var instructions = document.createElement('instructions');
+  instructions = document.createElement('div');
+  instructions.id = 'instructions';
+  instructions.className = 'keyboard-overlay-instructions';
+  instructions.style.left = ((BASE_INSTRUCTIONS.left - BASE_KEYBOARD.left) *
+                             width / BASE_KEYBOARD.width + minX) + 'px';
+  instructions.style.top = ((BASE_INSTRUCTIONS.top - BASE_KEYBOARD.top) *
+                            height / BASE_KEYBOARD.height + minY) + 'px';
+  instructions.style.width = (width * BASE_INSTRUCTIONS.width /
+                              BASE_KEYBOARD.width) + 'px';
+  instructions.style.height = (height * BASE_INSTRUCTIONS.height /
+                               BASE_KEYBOARD.height) + 'px';
+
+  var instructionsText = document.createElement('span');
+  instructionsText.id = 'instructions-text';
+  instructionsText.className = 'keyboard-overlay-instructions-text';
+  instructionsText.innerHTML = templateData.keyboardOverlayInstructions;
+  instructions.appendChild(instructionsText);
+  keyboard.appendChild(instructions);
+}
+
+/**
+ * A callback function for the onload event of the body element.
+ */
+function init() {
+  document.addEventListener('keydown', keydown);
+  document.addEventListener('keyup', keyup);
+  initLayout();
+  update();
+}
+
+document.addEventListener('DOMContentLoaded', init);