Slightly optimised code style and add more functionality

- optimised UI
- check conflicts when change key bind if the key has already been in use
- abstract keybind as a separate singleton class so all class can access it
- [WIP] turning mode is need to be finished

#story[1245]

src/main/java/seng302/model/GameKeyBind.java

@@ -0,0 +1,78 @@
+package seng302.model;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Map;
+import javafx.scene.input.KeyCode;
+
+public class GameKeyBind {
+
+    private static GameKeyBind instance;
+    private Map<KeyCode, KeyAction> keyToActionMap;
+    private Map<KeyAction, KeyCode> actionToKeyMap;
+    private boolean continuouslyTurning;
+
+
+    private GameKeyBind() {
+        setToDefault();
+    }
+
+    public void setToDefault() {
+        actionToKeyMap = new HashMap<>();
+        keyToActionMap = new HashMap<>();
+        continuouslyTurning = false;
+        // default key bindings
+        ArrayList<KeyCode> keys = new ArrayList<>();
+        keys.add(KeyCode.Z);
+        keys.add(KeyCode.X);
+        keys.add(KeyCode.SPACE);
+        keys.add(KeyCode.SHIFT);
+        keys.add(KeyCode.ENTER);
+        keys.add(KeyCode.PAGE_UP);
+        keys.add(KeyCode.PAGE_DOWN);
+        for (int i = 0; i < 7; i++) {
+            actionToKeyMap.put(KeyAction.getType(i + 1), keys.get(i));
+            keyToActionMap.put(keys.get(i), KeyAction.getType(i + 1));
+        }
+    }
+
+    public static GameKeyBind getInstance() {
+        if (instance == null) {
+            instance = new GameKeyBind();
+        }
+        return instance;
+    }
+
+    public KeyCode getKeyCode(KeyAction keyAction) {
+        return instance.actionToKeyMap.get(keyAction);
+    }
+
+    /**
+     * Binds a key to a key action
+     *
+     * @return true if successfully bind
+     */
+    public boolean bindKeyToAction(KeyCode keyCode, KeyAction keyAction) {
+        if (instance.keyToActionMap.containsKey(keyCode)) {
+            // if the key has been bound to other action, return false
+            return false;
+        } else {
+            instance.keyToActionMap.put(keyCode, keyAction); // add key -> action
+            KeyCode oldKeyCode = instance.actionToKeyMap
+                .get(keyAction); // get old key for the action
+            instance.keyToActionMap.remove(oldKeyCode); // remove the old key -> action
+            instance.actionToKeyMap
+                .replace(keyAction, keyCode); // replace the old key by the newer one
+            return true;
+        }
+    }
+
+    public void toggleTurningMode() {
+        continuouslyTurning = !continuouslyTurning;
+    }
+
+    public boolean isContinuouslyTurning() {
+        return continuouslyTurning;
+    }
+
+}

src/main/java/seng302/model/KeyAction.java

@@ -3,7 +3,7 @@ package seng302.model;
 import java.util.HashMap;
 import java.util.Map;
 
-public enum GameClientAction {
+public enum KeyAction {
     ZOOM_IN(1),
     ZOOM_OUT(2),
     VMG(3),
@@ -13,19 +13,19 @@ public enum GameClientAction {
     DOWNWIND(7);
 
     private final int type;
-    private static final Map<Integer, GameClientAction> intToTypeMap = new HashMap<>();
+    private static final Map<Integer, KeyAction> intToTypeMap = new HashMap<>();
 
     static {
-        for (GameClientAction type : GameClientAction.values()) {
+        for (KeyAction type : KeyAction.values()) {
             intToTypeMap.put(type.getValue(), type);
         }
     }
 
-    GameClientAction(int type) {
+    KeyAction(int type) {
         this.type = type;
     }
 
-    public static GameClientAction getType(int value) {
+    public static KeyAction getType(int value) {
         return intToTypeMap.get(value);
     }