Moving plugins, adding Keyboard integration

src/modules/webslides.js

@@ -1,4 +1,4 @@
-import Plugins from './plugins';
+import Plugins from '../plugins/plugins';
 import Slide from './slide';
 import DOM from '../utils/dom';
 import ScrollHelper from '../utils/scroll-to';
@@ -9,7 +9,8 @@ const CLASSES = {
 
 const PLUGINS = {
   'nav': Plugins.Navigation,
-  'hash': Plugins.Hash
+  'hash': Plugins.Hash,
+  'keyboard': Plugins.Keyboard
 };
 
 export default class WebSlides {

src/plugins/keyboard.js

@@ -0,0 +1,42 @@
+import Keys from '../utils/keys';
+
+export default class Keyboard {
+  /**
+   * @param {WebSlides} wsInstance The WebSlides instance
+   */
+  constructor(wsInstance) {
+    /**
+     * @type {WebSlides}
+     * @private
+     */
+    this.ws_ = wsInstance;
+
+    document.addEventListener("keydown", this.onKeyPress_.bind(this), false);
+  }
+
+  onKeyPress_(event) {
+    let method;
+
+    if (event.which === Keys.SPACE) {
+      method = this.ws_.goNext;
+    } else {
+      if (this.ws_.isVertical) {
+        if (event.which === Keys.DOWN) {
+          method = this.ws_.goNext;
+        } else if (event.which === Keys.UP) {
+          method = this.ws_.goPrev;
+        }
+      } else {
+        if (event.which === Keys.RIGHT) {
+          method = this.ws_.goNext;
+        } else if (event.which === Keys.LEFT) {
+          method = this.ws_.goPrev;
+        }
+      }
+    }
+
+    if (method) {
+      method.call(this.ws_);
+    }
+  }
+}

src/plugins/plugins.js

@@ -1,7 +1,9 @@
 import Navigation from './navigation';
 import Hash from './hash';
+import Keyboard from './keyboard';
 
 export default {
   Navigation,
-  Hash
+  Hash,
+  Keyboard
 };

src/utils/keys.js

@@ -0,0 +1,10 @@
+const Keys = {
+  ENTER: 13,
+  SPACE: 32,
+  LEFT: 37,
+  UP: 38,
+  RIGHT: 39,
+  DOWN: 40
+};
+
+export default Keys;