* Scrolls to the beginning of the very first row.
*/
public void scrollToStart() {
- scrollToRow(0, ScrollDestination.START);
+ if (getEscalator().getBody().getRowCount() > 0) {
+ scrollToRow(0, ScrollDestination.START);
+ }
}
/**
* Scrolls to the end of the very last row.
*/
public void scrollToEnd() {
- scrollToRow(escalator.getBody().getRowCount() - 1,
- ScrollDestination.END);
+ if (getEscalator().getBody().getRowCount() > 0) {
+ scrollToRow(escalator.getBody().getRowCount() - 1,
+ ScrollDestination.END);
+ }
}
/**
--- /dev/null
+package com.vaadin.tests.components.grid;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import com.vaadin.server.VaadinRequest;
+import com.vaadin.tests.components.AbstractTestUI;
+import com.vaadin.ui.Button;
+import com.vaadin.ui.Grid;
+import com.vaadin.ui.Grid.SelectionMode;
+
+/**
+ * There is no corresponding TB test as this problem can only be reproduced
+ * using SuperDevMode.
+ */
+public class GridScrollWithoutRows extends AbstractTestUI {
+
+ private int counter = 0;
+
+ @Override
+ protected void setup(VaadinRequest request) {
+ List<Integer> data = new ArrayList<>();
+
+ Grid<Integer> grid = new Grid<>();
+ grid.addColumn(Integer::valueOf).setCaption("ID").setId("id");
+ grid.addColumn(Integer::valueOf).setCaption("FOO").setId("foo");
+ grid.setItems(data);
+
+ grid.setSelectionMode(SelectionMode.NONE);
+ grid.setWidth("250px");
+ grid.setHeightByRows(3);
+ addComponent(grid);
+
+ addComponent(new Button("Add row", e -> {
+ data.add(counter);
+ ++counter;
+ grid.getDataProvider().refreshAll();
+ }));
+ Button beginningButton = new Button("Scroll to beginning", e -> {
+ grid.scrollToStart();
+ });
+ beginningButton.setId("beginning");
+ addComponent(beginningButton);
+ Button endButton = new Button("Scroll to end", e -> {
+ grid.scrollToEnd();
+ });
+ endButton.setId("end");
+ addComponent(endButton);
+ }
+
+ @Override
+ protected String getTestDescription() {
+ return "It should be possible to scroll to beginning or end without assertion errors "
+ + "even when there are no rows (requires SuperDevMode).";
+ }
+
+ @Override
+ protected Integer getTicketNumber() {
+ return 11558;
+ }
+}