feat: move items by doubleclick

Close #73

src/main/java/com/flowingcode/vaadin/addons/twincolgrid/TwinColGrid.java

@@ -87,6 +87,7 @@ private static final class TwinColModel<T> implements Serializable {
     HeaderRow headerRow;
     boolean droppedInsideGrid = false;
     boolean allowReordering = false;
+    Registration moveItemsByDoubleClick;
 
     TwinColModel(@NonNull Grid<T> grid, String className) {
       this.grid = grid;
@@ -1097,6 +1098,31 @@ public void setAutoResize(boolean autoResize) {
     }
   }  
 
+  /**
+   * Sets whether a doubleclick event immediately moves an item to the other grid
+   *
+   * @param value if true, a a doubleclick event will immediately move an item to the other grid
+   */
+  public void setMoveItemsByDoubleClick(boolean value) {
+    forEachSide(side -> {
+      if (value && side.moveItemsByDoubleClick == null) {
+        side.moveItemsByDoubleClick = side.grid.addItemDoubleClickListener(ev -> {
+          Set<T> item = Collections.singleton(ev.getItem());
+          if (side == available) {
+            updateSelection(item, Collections.emptySet(), true);
+          }
+          if (side == selection) {
+            updateSelection(Collections.emptySet(), item, true);
+          }
+        });
+      }
+      if (!value && side.moveItemsByDoubleClick != null) {
+        side.moveItemsByDoubleClick.remove();
+        side.moveItemsByDoubleClick = null;
+      }
+    });
+  }
+
   @ClientCallable
   private void updateOrientationOnResize(int width, int height) {
     if (height > width) {

src/test/java/com/flowingcode/vaadin/addons/twincolgrid/DoubleClickDemo.java

@@ -0,0 +1,73 @@
+/*-
+ * #%L
+ * TwinColGrid add-on
+ * %%
+ * Copyright (C) 2017 - 2022 Flowing Code
+ * %%
+ * 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.
+ * #L%
+ */
+package com.flowingcode.vaadin.addons.twincolgrid;
+
+import com.flowingcode.vaadin.addons.demo.DemoSource;
+import com.vaadin.flow.component.html.Span;
+import com.vaadin.flow.component.orderedlayout.VerticalLayout;
+import com.vaadin.flow.router.PageTitle;
+import com.vaadin.flow.router.Route;
+import java.util.ArrayList;
+import java.util.Comparator;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+@SuppressWarnings("serial")
+@PageTitle("Double click")
+@DemoSource
+@Route(value = "twincolgrid/doubleclick", layout = TwincolDemoView.class)
+public class DoubleClickDemo extends VerticalLayout {
+
+  private final Set<Book> selectedBooks = new HashSet<>();
+  private final List<Book> availableBooks = new ArrayList<>();
+
+  public DoubleClickDemo() {
+    initializeData();
+
+    final TwinColGrid<Book> twinColGrid =
+        new TwinColGrid<>(availableBooks, null)
+            .addSortableColumn(Book::getIsbn, Comparator.comparing(Book::getIsbn), "ISBN")
+            .addSortableColumn(Book::getTitle, Comparator.comparing(Book::getTitle), "Title")
+            .withAvailableGridCaption("Available books")
+            .withSelectionGridCaption("Added books")
+            .withSizeFull()
+            .selectRowOnClick();
+    twinColGrid.setValue(selectedBooks);
+    twinColGrid.setMoveItemsByDoubleClick(true);
+
+    add(new Span("Move items by double click"), twinColGrid);
+    setSizeFull();
+  }
+
+  private void initializeData() {
+    selectedBooks.add(new Book("1478375108", "Vaadin Recipes"));
+    selectedBooks.add(new Book("9789526800677", "Book of Vaadin: Volume 2 "));
+    availableBooks.add(new Book("1478375108", "Vaadin Recipes"));
+    availableBooks.add(new Book("9781849515221", "Learning Vaadin"));
+    availableBooks.add(
+        new Book("9781782162261", "Vaadin 7 UI Design By Example: Beginner\u2019s Guide"));
+    availableBooks.add(new Book("9781849518802", "Vaadin 7 Cookbook"));
+    availableBooks.add(new Book("9526800605", "Book of Vaadin: 7th Edition, 1st Revision"));
+    availableBooks.add(new Book("9789526800677", "Book of Vaadin: Volume 2 "));
+    availableBooks.add(new Book("9529267533", "Book of Vaadin"));
+    availableBooks.add(new Book("1782169776", "Learning Vaadin 7, Second Edition"));
+  }
+}

src/test/java/com/flowingcode/vaadin/addons/twincolgrid/TwincolDemoView.java

@@ -37,6 +37,7 @@ public TwincolDemoView() {
     addDemo(FilterableDemo.class);
     addDemo(BoundDemo.class);
     addDemo(OrientationDemo.class);
+    addDemo(DoubleClickDemo.class);
     setSizeFull();
   }
 }