1 files changed, 85 insertions, 0 deletions
diff --git a/uitest/src/com/vaadin/tests/dd/CustomDDImplementation.java b/uitest/src/com/vaadin/tests/dd/CustomDDImplementation.java
new file mode 100644
index 0000000000..f6e196761e
--- /dev/null
+++ b/uitest/src/com/vaadin/tests/dd/CustomDDImplementation.java
@@ -0,0 +1,85 @@
+package com.vaadin.tests.dd;
+
+import java.util.Map;
+
+import com.vaadin.event.dd.DragAndDropEvent;
+import com.vaadin.event.dd.DropHandler;
+import com.vaadin.event.dd.DropTarget;
+import com.vaadin.event.dd.TargetDetails;
+import com.vaadin.event.dd.acceptcriteria.AcceptAll;
+import com.vaadin.event.dd.acceptcriteria.AcceptCriterion;
+import com.vaadin.ui.AbstractComponent;
+import com.vaadin.ui.Component;
+import com.vaadin.ui.CssLayout;
+import com.vaadin.ui.CustomComponent;
+import com.vaadin.ui.Layout;
+
+/**
+ * Test/Example/Draft code how to build custom DD implementation using the thing
+ * framework provided by Vaadin.
+ * 
+ */
+public class CustomDDImplementation extends CustomComponent {
+
+    public CustomDDImplementation() {
+        Layout l = new CssLayout();
+        l.addComponent(new MyDropTarget());
+        l.addComponent(new MyDragSource());
+    }
+
+    /**
+     * Server side component that accepts drags must implement HasDropHandler
+     * that have one method to get reference of DropHandler.
+     * 
+     * DropHandler may be implemented directly or probably most commonly using a
+     * half baked implementation {@link AbstractDropHandler}.
+     * 
+     * Check the @ClientWidget
+     * 
+     */
+    class MyDropTarget extends AbstractComponent implements DropTarget {
+        @Override
+        public DropHandler getDropHandler() {
+            return new DropHandler() {
+
+                @Override
+                public void drop(DragAndDropEvent event) {
+                    // Do something with data
+                    return;
+                }
+
+                @Override
+                public AcceptCriterion getAcceptCriterion() {
+                    return AcceptAll.get();
+                }
+
+            };
+        }
+
+        @Override
+        public TargetDetails translateDropTargetDetails(
+                Map<String, Object> clientVariables) {
+            // If component has some special drop details that it needs to
+            // translate for server side use, developer must return a
+            // DragDropDetails here. If details does not exist or raw client
+            // side data is ok, it is safe to return null here.
+            return null;
+        }
+
+    }
+
+    /**
+     * Server side implementation of source does not necessary need to contain
+     * anything.
+     * 
+     * Check the @ClientWidget
+     * 
+     * However component might have different modes to support starting drag
+     * operations that are controlled via server side api.
+     * 
+     */
+    public class MyDragSource extends AbstractComponent implements Component {
+
+    }
+
+}