Add "deselect allowed" feature to the Grid. (#8227)

* Add "deselect allowed" feature to the Grid.

Fixes #8149

1 files changed, 20 insertions, 0 deletions

diff --git a/server/src/main/java/com/vaadin/data/SelectionModel.java b/server/src/main/java/com/vaadin/data/SelectionModel.java
index 29c32c7698..397e2a1557 100644
--- a/server/src/main/java/com/vaadin/data/SelectionModel.java
+++ b/server/src/main/java/com/vaadin/data/SelectionModel.java
@@ -103,6 +103,26 @@ public interface SelectionModel<T> extends Serializable {
         default Optional<T> getFirstSelectedItem() {
             return getSelectedItem();
         }
+
+        /**
+         * Sets whether it's allowed to deselect the selected row through the
+         * UI. Deselection is allowed by default.
+         *
+         * @param deselectAllowed
+         *            <code>true</code> if the selected row can be deselected
+         *            without selecting another row instead; otherwise
+         *            <code>false</code>.
+         */
+        public void setDeselectAllowed(boolean deselectAllowed);
+
+        /**
+         * Gets whether it's allowed to deselect the selected row through the
+         * UI.
+         *
+         * @return <code>true</code> if deselection is allowed; otherwise
+         *         <code>false</code>
+         */
+        public boolean isDeselectAllowed();
     }
 
     /**