Fix button toggling after being dragged

src/me/mars/DragTable.java

@@ -1,22 +1,28 @@
 package me.mars;
 
 import arc.Core;
-import arc.func.Floatc2;
 import arc.input.KeyCode;
 import arc.math.Mathf;
+import arc.scene.Element;
+import arc.scene.event.ChangeListener;
 import arc.scene.event.InputEvent;
 import arc.scene.event.InputListener;
 import arc.scene.ui.layout.Table;
 
 public class DragTable extends Table {
+	float xDelta, yDelta;
+
 	public DragTable() {
 		super();
+
 		addListener(new InputListener() {
 			float lastX, lastY;
 
 			@Override
 			public void touchDragged(InputEvent event, float x, float y, int pointer) {
 				if(Core.app.isMobile() && pointer != 0) return;
+				DragTable.this.xDelta += x - this.lastX;
+				DragTable.this.yDelta += y - this.lastY;
 				x = Mathf.clamp(DragTable.this.x - this.lastX + x, 0, Core.graphics.getWidth()-DragTable.this.width);
 				y = Mathf.clamp(DragTable.this.y - this.lastY + y, 0, Core.graphics.getHeight()-DragTable.this.height);
 				DragTable.this.setPosition(x, y);
@@ -27,10 +33,17 @@ public boolean touchDown(InputEvent event, float x, float y, int pointer, KeyCod
 				if(Core.app.isMobile() && pointer != 0) return false;
 				this.lastX = x;
 				this.lastY = y;
+				DragTable.this.xDelta = 0;
+				DragTable.this.yDelta = 0;
 				return true;
 			}
+		});
 
-
+		addCaptureListener(new ChangeListener() {
+			@Override
+			public void changed(ChangeEvent event, Element actor) {
+				if ((Math.abs(xDelta) > DragTable.this.width || Math.abs(yDelta) > DragTable.this.height)) event.stop();
+			}
 		});
 	}
 }