Keyboard handler

src/index.js

@@ -9,5 +9,8 @@ require('./math.js')
 // Mouse helpers
 require('./mouse.js')
 
+// Keyboard helpers
+require('./keyboard.js')
+
 // Image helpers
 require('./image.js')

src/keyboard.js

@@ -0,0 +1,136 @@
+
+DWE.Keyboard = {}
+
+var keyList = {}
+var previousKeyList = {}
+
+var specialKeyMap = {
+  'backspace': 8,
+  'tab': 9,
+  'enter': 13,
+  'shift': 16,
+  'ctrl': 17,
+  'alt': 18,
+  'pausebreak': 19,
+  'capslock': 20,
+  'escape': 27,
+  'pgup': 33,
+  'pgdown': 34,
+  'end': 35,
+  'home': 36,
+  'left': 37,
+  'up': 38,
+  'right': 39,
+  'down': 40,
+  'insert': 45,
+  'delete': 46,
+  'left-window': 91,
+  'right-window': 92,
+  'select': 93,
+  'numpad0': 96,
+  'numpad1': 97,
+  'numpad2': 98,
+  'numpad3': 99,
+  'numpad4': 100,
+  'numpad5': 101,
+  'numpad6': 102,
+  'numpad7': 103,
+  'numpad8': 104,
+  'numpad9': 105,
+  'multiply': 106,
+  'add': 107,
+  'subtract': 109,
+  'decimal': 110,
+  'divide': 111,
+  'f1': 112,
+  'f2': 113,
+  'f3': 114,
+  'f4': 115,
+  'f5': 116,
+  'f6': 117,
+  'f7': 118,
+  'f8': 119,
+  'f9': 120,
+  'f10': 121,
+  'f11': 122,
+  'f12': 123,
+  'numlock':  144,
+  'scrolllock': 145,
+  'semi-colon': 186,
+  'equals': 187,
+  'comma': 188,
+  'dash': 189,
+  'period': 190,
+  'fwdslash': 191,
+  'grave': 192,
+  'open-bracket': 219,
+  'bkslash': 220,
+  'close-braket': 221,
+  'single-quote': 222
+}
+
+DWE.Keyboard.toggleKey = function (keyCode, on) {
+  // Find key in special key list
+  var key = null
+  for (let k in specialKeyMap) {
+    let val = specialKeyMap[k]
+    if (keyCode === val) {
+      key = k
+      break
+    }
+  }
+
+  // Use fromCharCode
+  if (!key) {
+    key = String.fromCharCode(keyCode).toLowerCase()
+  }
+
+  keyList[key] = (on === true)
+}
+
+DWE.Keyboard.keyDown = function (e) {
+  var keycode
+  if (window.event)
+    keycode = window.event.keyCode
+  else if (e)
+    keycode = e.which
+  DWE.Keyboard.toggleKey(keycode, true)
+}
+
+DWE.Keyboard.keyUp = function (e) {
+  var keycode
+  if (window.event)
+    keycode = window.event.keyCode
+  else if (e)
+    keycode = e.which
+  DWE.Keyboard.toggleKey(keycode, false)
+}
+
+function down (key) {
+  return keyList[key] != null ? keyList[key] : false
+}
+
+function downLast (key) {
+  return previousKeyList[key] != null ? previousKeyList[key] : false
+}
+
+DWE.Keyboard.isDown = function (key) {
+  return down(key) && downLast(key)
+}
+
+DWE.Keyboard.isUp = function (key) {
+  return !DWE.Keyboard.isDown(key)
+}
+
+DWE.Keyboard.isPressed = function (key) {
+  return down(key) === true && downLast(key) === false
+}
+
+DWE.Keyboard.nextIteration = function () {
+  previousKeyList = {}
+  for (let k in keyList) {
+    if (keyList[k] === true) {
+      previousKeyList[k] = true
+    }
+  }
+}