Implement basic footer support for Grid

Change-Id: I3db51521320767a28bc3acd9586b1453764a15bc

1 files changed, 22 insertions, 0 deletions

diff --git a/client/src/main/java/com/vaadin/client/connectors/grid/GridConnector.java b/client/src/main/java/com/vaadin/client/connectors/grid/GridConnector.java
index 4686b3bd21..a19c955fc4 100644
--- a/client/src/main/java/com/vaadin/client/connectors/grid/GridConnector.java
+++ b/client/src/main/java/com/vaadin/client/connectors/grid/GridConnector.java
@@ -53,6 +53,7 @@ import com.vaadin.client.widget.grid.sort.SortEvent;
 import com.vaadin.client.widget.grid.sort.SortOrder;
 import com.vaadin.client.widgets.Grid;
 import com.vaadin.client.widgets.Grid.Column;
+import com.vaadin.client.widgets.Grid.FooterRow;
 import com.vaadin.client.widgets.Grid.HeaderRow;
 import com.vaadin.shared.MouseEventDetails;
 import com.vaadin.shared.data.DataCommunicatorConstants;
@@ -264,6 +265,27 @@ public class GridConnector
         }
     }
 
+    /**
+     * Updates the grid footer section on state change.
+     */
+    @OnStateChange("footer")
+    void updateFooter() {
+        final Grid<JsonObject> grid = getWidget();
+        final SectionState state = getState().footer;
+
+        while (grid.getFooterRowCount() > 0) {
+            grid.removeFooterRow(0);
+        }
+
+        for (RowState rowState : state.rows) {
+            FooterRow row = grid.appendFooterRow();
+
+            rowState.cells.forEach((columnId, cellState) -> {
+                row.getCell(getColumn(columnId)).setText(cellState.text);
+            });
+        }
+    }
+
     @Override
     public void setDataSource(DataSource<JsonObject> dataSource) {
         super.setDataSource(dataSource);