From 05da6a78934fb80574de39207fda9dcd09500df7 Mon Sep 17 00:00:00 2001
From: Evert Prants <imsonotsleepy@gmail.com>
Date: Sun, 19 Aug 2018 13:50:13 +0300
Subject: [PATCH] Keyboard handler

---
 dist/dwelibs.min.js |   2 +-
 src/index.js        |   3 +
 src/keyboard.js     | 136 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 140 insertions(+), 1 deletion(-)
 create mode 100644 src/keyboard.js

diff --git a/dist/dwelibs.min.js b/dist/dwelibs.min.js
index 3fa67b5..d4b4d13 100644
--- a/dist/dwelibs.min.js
+++ b/dist/dwelibs.min.js
@@ -1 +1 @@
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+!function(t){var e={};function n(r){if(e[r])return e[r].exports;var o=e[r]={i:r,l:!1,exports:{}};return t[r].call(o.exports,o,o.exports,n),o.l=!0,o.exports}n.m=t,n.c=e,n.d=function(t,e,r){n.o(t,e)||Object.defineProperty(t,e,{enumerable:!0,get:r})},n.r=function(t){"undefined"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(t,Symbol.toStringTag,{value:"Module"}),Object.defineProperty(t,"__esModule",{value:!0})},n.t=function(t,e){if(1&e&&(t=n(t)),8&e)return t;if(4&e&&"object"==typeof t&&t&&t.__esModule)return t;var r=Object.create(null);if(n.r(r),Object.defineProperty(r,"default",{enumerable:!0,value:t}),2&e&&"string"!=typeof t)for(var o in t)n.d(r,o,function(e){return t[e]}.bind(null,o));return r},n.n=function(t){var e=t&&t.__esModule?function(){return t.default}:function(){return t};return n.d(e,"a",e),e},n.o=function(t,e){return Object.prototype.hasOwnProperty.call(t,e)},n.p="",n(n.s=0)}([function(t,e,n){"use 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diff --git a/src/index.js b/src/index.js
index 7c7aa89..5b629a5 100644
--- a/src/index.js
+++ b/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')
diff --git a/src/keyboard.js b/src/keyboard.js
new file mode 100644
index 0000000..b6225b0
--- /dev/null
+++ b/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
+    }
+  }
+}