Create combined drop mode to allow both on_top and between drops (#9063)

Resolves #8932

2 files changed, 22 insertions, 0 deletions

diff --git a/shared/src/main/java/com/vaadin/shared/ui/grid/DropMode.java b/shared/src/main/java/com/vaadin/shared/ui/grid/DropMode.java
index 2db639be7d..1da17f1bba 100644
--- a/shared/src/main/java/com/vaadin/shared/ui/grid/DropMode.java
+++ b/shared/src/main/java/com/vaadin/shared/ui/grid/DropMode.java
@@ -35,4 +35,18 @@ public enum DropMode {
      * is the row under the cursor at the time of the drop event.
      */
     ON_TOP,
+
+    /**
+     * The drop event can happen either on top of or between Grid rows. The drop
+     * is either
+     * <ul>
+     * <li><i>above</i> a row when the cursor is over a specified portion of
+     * the top part of the row,</li>
+     * <li><i>below</i> when the cursor is over a specified portion of the
+     * bottom part of the row, or</li>
+     * <li><i>on top</i> when the cursor is over the row but doesn't match the
+     * above conditions.</li>
+     * </ul>
+     */
+    ON_TOP_OR_BETWEEN
 }
diff --git a/shared/src/main/java/com/vaadin/shared/ui/grid/GridDropTargetState.java b/shared/src/main/java/com/vaadin/shared/ui/grid/GridDropTargetState.java
index aae051b299..36869bfd62 100644
--- a/shared/src/main/java/com/vaadin/shared/ui/grid/GridDropTargetState.java
+++ b/shared/src/main/java/com/vaadin/shared/ui/grid/GridDropTargetState.java
@@ -29,4 +29,12 @@ public class GridDropTargetState extends DropTargetState {
      * Stores the drop mode of the drop target Grid.
      */
     public DropMode dropMode;
+
+    /**
+     * Stores the threshold between drop locations within a row in pixels.
+     * Defaults to 5px.
+     *
+     * @see DropMode#ON_TOP_OR_BETWEEN
+     */
+    public int dropThreshold = 5;
 }