refactor: controllable is app level

traits/controllable.js

@@ -0,0 +1,47 @@
+import * as I from 'immutable';
+
+import {Trait} from '@avocado/entity';
+
+// Input handling.
+export class Controllable extends Trait {
+
+  initialize() {
+    this._inputState = I.Set();
+  }
+
+  listeners() {
+    return {
+      tick: (elapsed) => {
+        const {_inputState: inputState} = this;
+        if (0 === inputState.size) {
+          this.entity.currentAnimation = 'idle';
+          return;
+        }
+        const movementVector = [0, 0];
+        if (inputState.has('MoveUp')) {
+          movementVector[1] -= 1;
+        }
+        if (inputState.has('MoveRight')) {
+          movementVector[0] += 1;
+        }
+        if (inputState.has('MoveDown')) {
+          movementVector[1] += 1;
+        }
+        if (inputState.has('MoveLeft')) {
+          movementVector[0] -= 1;
+        }
+        if (0 === movementVector[0] && 0 === movementVector[1]) {
+          return;
+        }
+        this.entity.requestMovement(movementVector);
+        this.entity.currentAnimation = 'moving';
+      },
+    }
+  }
+
+  set inputState(inputState) {
+    this._inputState = I.Set(inputState);
+  }
+
+}
+