Added missing file

src/com/patryk/mathdoku/gui/InputHandler.java

+package com.patryk.mathdoku.gui;
+
+import com.patryk.mathdoku.util.Direction;
+import com.patryk.mathdoku.util.Util;
+import com.patryk.mathdoku.util.BoardPosVec;
+import javafx.event.EventHandler;
+import javafx.scene.input.KeyEvent;
+import javafx.scene.input.MouseEvent;
+
+public class InputHandler {
+    //the class must store view in order to be able to call its methods
+    GameGridView view;
+
+    //constructor
+    public InputHandler(GameGridView view){
+        this.view = view;
+
+    }
+
+    //mouse callback
+    EventHandler<MouseEvent> mouseHandler = new EventHandler<MouseEvent>() {
+        @Override
+        public void handle(MouseEvent mouseEvent) {
+            view.getNode().requestFocus();
+            BoardPosVec selectedCellPos = new BoardPosVec((int)mouseEvent.getY(), (int)mouseEvent.getX());
+            selectedCellPos = selectedCellPos.fromPixelToBoardSpace();
+            view.setSelectedCell(selectedCellPos);
+
+        }
+    };
+
+    //key callback
+    EventHandler<KeyEvent> keyEventHandler = new EventHandler<KeyEvent>() {
+        @Override
+        //can either be user entering a value, or navigating
+        public void handle(KeyEvent keyEvent) {
+            if (!handleDirectionKeyPress(keyEvent)) handleValueEntered(keyEvent);
+        }
+    };
+
+    public boolean handleDirectionKeyPress(KeyEvent event) {
+
+        Direction direction;// = Util.Direction.NORTH;
+        switch (event.getCode()) {
+
+            case W:
+            case UP:
+                direction = Direction.NORTH;
+                break;
+            case D:
+            case RIGHT:
+                direction = Direction.EAST;
+                break;
+
+            case S:
+            case DOWN:
+                direction = Direction.SOUTH;
+                break;
+
+            case A:
+            case LEFT:
+                direction = Direction.WEST;
+                break;
+
+
+            default:
+                return false;
+
+
+        }
+
+        //consume if arrow key to prevent loss of focus
+        switch (event.getCode()) {
+            case UP:
+            case RIGHT:
+            case DOWN:
+            case LEFT:
+                event.consume();
+        }
+        view.setSelectedCell(view.getSelectedCell().add(direction.vector));
+        return true;
+    }
+
+    public boolean handleValueEntered (KeyEvent keyEvent) {
+        switch (keyEvent.getCode()) {
+            case BACK_SPACE:
+                view.getGameContext().setValueAtCell(view.getSelectedCell(), 0, true);
+                break;
+            default:
+                char keyCharacter = keyEvent.getText().charAt(0);
+                char maxChar = Character.forDigit(view.getGameContext().getBoardWidth(), 10);
+                //if digit entered:
+                if ( keyCharacter >='1'&& keyCharacter <= maxChar) {
+                    injectNumberKey(Util.charToInt(keyCharacter));
+                    return true;
+                }
+
+                return false;
+
+
+        }
+
+
+        return true;
+    }
+
+    public void injectNumberKey(int digit) {
+        view.getGameContext().setValueAtCell(view.getSelectedCell(), digit, true);
+    }
+
+    //returns handlers so that the view can register them
+    public EventHandler<MouseEvent> getMouseHandler() {
+        return mouseHandler;
+    }
+
+    public EventHandler<KeyEvent> getKeyEventHandler() {
+        return keyEventHandler;
+    }
+}