fix away detection, pause while user is present

src/main/java/wtf/beatrice/autosqueal/controls/RobotMouseTracker.java

@@ -0,0 +1,37 @@
+package wtf.beatrice.autosqueal.controls;
+
+/**
+ * Keeps track of the mouse movements the app itself performs, so that other
+ * components (like the away detection) can tell them apart from the user's.
+ *
+ * Written by the movement tasks, read by whoever needs to know.
+ */
+public class RobotMouseTracker {
+
+    private volatile boolean moving = false;
+    private volatile int lastX = Integer.MIN_VALUE;
+    private volatile int lastY = Integer.MIN_VALUE;
+
+    /** Marks the start of a movement performed by the app. */
+    public void moveStarted() {
+        moving = true;
+    }
+
+    /**
+     * Marks the end of a movement performed by the app, which left the cursor
+     * at the given coordinates.
+     */
+    public void moveEnded(int x, int y) {
+        lastX = x;
+        lastY = y;
+        moving = false;
+    }
+
+    public boolean isMoving() {
+        return moving;
+    }
+
+    public boolean isLastPosition(int x, int y) {
+        return x == lastX && y == lastY;
+    }
+}