Prevent scrolling when expanding a TreeTable item (#18247)

Change-Id: I837ee83a75337eef4338e7206cdd0e366b24f183

client/src/com/vaadin/client/ui/VScrollTable.java

@@ -1295,8 +1295,12 @@ public class VScrollTable extends FlowPanel implements HasWidgets,
         if (uidl.hasVariable("selected")) {
             final Set<String> selectedKeys = uidl
                     .getStringArrayVariableAsSet("selected");
-            removeUnselectedRowKeys(selectedKeys);
-
+            // Do not update focus if there is a single selected row
+            // that is the same as the previous selection. This prevents
+            // unwanted scrolling (#18247).
+            boolean rowsUnSelected = removeUnselectedRowKeys(selectedKeys);
+            boolean updateFocus = rowsUnSelected || selectedRowKeys.size() == 0
+                    || focusedRow == null;
             if (scrollBody != null) {
                 Iterator<Widget> iterator = scrollBody.iterator();
                 while (iterator.hasNext()) {
@@ -1313,7 +1317,7 @@ public class VScrollTable extends FlowPanel implements HasWidgets,
                         selected = true;
                         keyboardSelectionOverRowFetchInProgress = true;
                     }
-                    if (selected && selectedKeys.size() == 1) {
+                    if (selected && selectedKeys.size() == 1 && updateFocus) {
                         /*
                          * If a single item is selected, move focus to the
                          * selected row. (#10522)
@@ -1338,14 +1342,14 @@ public class VScrollTable extends FlowPanel implements HasWidgets,
         return keyboardSelectionOverRowFetchInProgress;
     }
 
-    private void removeUnselectedRowKeys(final Set<String> selectedKeys) {
+    private boolean removeUnselectedRowKeys(final Set<String> selectedKeys) {
         List<String> unselectedKeys = new ArrayList<String>(0);
         for (String key : selectedRowKeys) {
             if (!selectedKeys.contains(key)) {
                 unselectedKeys.add(key);
             }
         }
-        selectedRowKeys.removeAll(unselectedKeys);
+        return selectedRowKeys.removeAll(unselectedKeys);
     }
 
     /** For internal use only. May be removed or replaced in the future. */

uitest/src/com/vaadin/tests/components/treetable/TreeTableScrollOnExpand.java

@@ -0,0 +1,51 @@
+/*
+ * Copyright 2000-2014 Vaadin Ltd.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+package com.vaadin.tests.components.treetable;
+
+import com.vaadin.server.VaadinRequest;
+import com.vaadin.tests.components.AbstractTestUI;
+import com.vaadin.ui.TreeTable;
+
+public class TreeTableScrollOnExpand extends AbstractTestUI {
+
+    @Override
+    protected void setup(VaadinRequest request) {
+        TreeTable t = new TreeTable();
+        t.setSelectable(true);
+        t.setImmediate(true);
+        t.setSizeFull();
+        t.addContainerProperty("Name", String.class, "null");
+        for (int i = 1; i <= 100; i++) {
+            String parentID = "Item " + i;
+            Object parent = t.addItem(new Object[] { parentID }, parentID);
+            String childID = "Item " + (100 + i);
+            Object child = t.addItem(new Object[] { childID }, childID);
+            t.getContainerDataSource().setParent(childID, parentID);
+        }
+        addComponent(t);
+    }
+
+    @Override
+    public Integer getTicketNumber() {
+        return 18247;
+    }
+
+    @Override
+    public String getTestDescription() {
+        return "After selecting an item and scrolling it out of view, TreeTable should not scroll to the "
+                + "selected item when expanding an item.";
+    }
+}

uitest/src/com/vaadin/tests/components/treetable/TreeTableScrollOnExpandTest.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright 2000-2014 Vaadin Ltd.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+package com.vaadin.tests.components.treetable;
+
+import static org.junit.Assert.assertEquals;
+
+import java.io.IOException;
+
+import org.junit.Test;
+import org.openqa.selenium.By;
+import org.openqa.selenium.WebElement;
+
+import com.vaadin.testbench.elements.TreeTableElement;
+import com.vaadin.tests.tb3.MultiBrowserTest;
+
+public class TreeTableScrollOnExpandTest extends MultiBrowserTest {
+
+    @Test
+    public void testScrollOnExpand() throws InterruptedException, IOException {
+        openTestURL();
+        TreeTableElement tt = $(TreeTableElement.class).first();
+        tt.getRow(0).click();
+        tt.scroll(300);
+        sleep(1000);
+        tt.getRow(20).toggleExpanded();
+        // Need to wait a bit to avoid accepting the case where the TreeTable is
+        // in the desired state only for a short while.
+        sleep(1000);
+        WebElement focusedRow = getDriver().findElement(
+                By.className("v-table-focus"));
+        assertEquals("Item 21", focusedRow.getText());
+    }
+}