add Grid.Column#get/setAssistiveCaption (#10219)

* add Grid#Column#get/setAssistiveCaption

* fix test and update doc

* move testGridAssistiveCaption to GridTest

* delete test file

* delete test file

* Delete GridAssistiveCaptionTest.java

* Create GridAssistiveCaptionTest

* Create GridAssistiveCaption

* Rename GridAssistiveCaption to GridAssistiveCaption.java

* Rename GridAssistiveCaptionTest to GridAssistiveCaptionTest.java

* Reformat using eclipse

1 files changed, 34 insertions, 0 deletions

diff --git a/server/src/main/java/com/vaadin/ui/Grid.java b/server/src/main/java/com/vaadin/ui/Grid.java
index 7282afb44c..1e35578b19 100644
--- a/server/src/main/java/com/vaadin/ui/Grid.java
+++ b/server/src/main/java/com/vaadin/ui/Grid.java
@@ -1203,6 +1203,36 @@ public class Grid<T> extends AbstractListing<T> implements HasComponents,
         }
 
         /**
+         * Sets the header aria-label for this column.
+         *
+         * @param caption
+         *            the header aria-label, null removes
+         *            the aria-label from this column
+         *
+         * @return this column
+         *
+         * @since
+         */
+        public Column<T, V> setAssistiveCaption(String caption) {
+            if (Objects.equals(caption, getAssistiveCaption())) {
+                return this;
+            }
+            getState().assistiveCaption = caption;
+            return this;
+        }
+
+        /**
+         * Gets the header caption for this column.
+         *
+         * @return header caption
+         *
+         * @since
+         */
+        public String getAssistiveCaption() {
+            return getState(false).assistiveCaption;
+        }
+
+        /**
          * Sets the header caption for this column.
          *
          * @param caption
@@ -2131,6 +2161,10 @@ public class Grid<T> extends AbstractListing<T> implements HasComponents,
                 setHidingToggleCaption(DesignAttributeHandler.readAttribute(
                         "hiding-toggle-caption", attributes, String.class));
             }
+            if (design.hasAttr("assistive-caption")) {
+                setAssistiveCaption(DesignAttributeHandler.readAttribute(
+                        "assistive-caption", attributes, String.class));
+            }
 
             // Read size info where necessary.
             if (design.hasAttr("width")) {