Add recursive expand and collapse method to TreeGrid and Tree (#10283)

1 files changed, 7 insertions, 0 deletions

diff --git a/shared/src/main/java/com/vaadin/shared/Range.java b/shared/src/main/java/com/vaadin/shared/Range.java
index 042cc527a0..b47963fd50 100644
--- a/shared/src/main/java/com/vaadin/shared/Range.java
+++ b/shared/src/main/java/com/vaadin/shared/Range.java
@@ -31,6 +31,9 @@ import java.io.Serializable;
  * @author Vaadin Ltd
  */
 public final class Range implements Serializable {
+
+    private static final Range EMPTY = Range.withLength(0, 0);
+
     private final int start;
     private final int end;
 
@@ -90,6 +93,10 @@ public final class Range implements Serializable {
         return new Range(start, start + length);
     }
 
+    public static Range emptyRange() {
+        return EMPTY;
+    }
+
     /**
      * Creates a new range between two numbers: <code>[start..end[</code>.
      *