Make it possible to set a Resource as drag image (#9088)

Fixes #8892

Note that IE and Edge are not covered by this change - see #8977

1 files changed, 11 insertions, 0 deletions

diff --git a/server/src/main/java/com/vaadin/event/dnd/DragSourceExtension.java b/server/src/main/java/com/vaadin/event/dnd/DragSourceExtension.java
index 88b3133b2b..7ff84757d9 100644
--- a/server/src/main/java/com/vaadin/event/dnd/DragSourceExtension.java
+++ b/server/src/main/java/com/vaadin/event/dnd/DragSourceExtension.java
@@ -18,6 +18,7 @@ package com.vaadin.event.dnd;
 import java.util.Objects;
 
 import com.vaadin.server.AbstractExtension;
+import com.vaadin.server.Resource;
 import com.vaadin.shared.Registration;
 import com.vaadin.shared.ui.dnd.DragSourceRpc;
 import com.vaadin.shared.ui.dnd.DragSourceState;
@@ -220,6 +221,16 @@ public class DragSourceExtension<T extends AbstractComponent> extends
                 listener, DragEndListener.DRAGEND_METHOD);
     }
 
+    /**
+     * Set a custom drag image for the current drag source.
+     *
+     * @param imageResource
+     *         Resource of the image to be displayed as drag image.
+     */
+    public void setDragImage(Resource imageResource) {
+        setResource(DragSourceState.RESOURCE_DRAG_IMAGE, imageResource);
+    }
+
     @Override
     protected DragSourceState getState() {
         return (DragSourceState) super.getState();