fix #902 add scrollwheel support to carousel

domino-ui/src/main/java/org/dominokit/domino/ui/carousel/Carousel.java

@@ -19,11 +19,16 @@
 import static org.dominokit.domino.ui.utils.Domino.*;
 
 import elemental2.dom.HTMLDivElement;
+import elemental2.dom.WheelEvent;
 import java.util.ArrayList;
 import java.util.List;
+import jsinterop.base.Js;
+import org.dominokit.domino.ui.config.CarouselConfig;
+import org.dominokit.domino.ui.config.HasComponentConfig;
 import org.dominokit.domino.ui.elements.AnchorElement;
 import org.dominokit.domino.ui.elements.DivElement;
 import org.dominokit.domino.ui.elements.OListElement;
+import org.dominokit.domino.ui.events.EventType;
 import org.dominokit.domino.ui.icons.lib.Icons;
 import org.dominokit.domino.ui.style.CssClass;
 import org.dominokit.domino.ui.style.GenericCss;
@@ -39,7 +44,8 @@
  *
  * @see BaseDominoElement
  */
-public class Carousel extends BaseDominoElement<HTMLDivElement, Carousel> {
+public class Carousel extends BaseDominoElement<HTMLDivElement, Carousel>
+    implements HasComponentConfig<CarouselConfig> {
 
   private final OListElement indicatorsElement;
   private final DivElement slidesElement;
@@ -57,6 +63,7 @@ public class Carousel extends BaseDominoElement<HTMLDivElement, Carousel> {
   private Slide targetSlide;
   private int autoSlideDuration = 3000;
   private boolean attached = false;
+  private CarouselConfig carouselConfig;
 
   /**
    * Factory method to create an empty Carousel
@@ -69,7 +76,6 @@ public static Carousel create() {
 
   /** Creates and empty Carousel */
   public Carousel() {
-
     element =
         div()
             .appendChild(indicatorsElement = ol().addCss(carousel_indicators))
@@ -89,11 +95,7 @@ public Carousel() {
                         .appendChild(
                             Icons.chevron_right()
                                 .addCss(GenericCss.dui_vertical_center, dui_font_size_12))
-                        .addEventListener(
-                            "click",
-                            evt -> {
-                              next();
-                            }))
+                        .addEventListener("click", evt -> next()))
             .addCss(carousel);
     timer =
         new Timer() {
@@ -105,6 +107,21 @@ public void run() {
     addAttachListener();
     addDetachListener();
     init(this);
+    addEventListener(
+        EventType.wheel.getName(),
+        evt -> {
+          if (getConfig().isScrollCarouselWithWheel()) {
+            evt.preventDefault();
+            WheelEvent wheelEvent = Js.uncheckedCast(evt);
+            if (wheelEvent.deltaY > 0) {
+              nextSlide();
+            }
+
+            if (wheelEvent.deltaY < 0) {
+              prevSlide();
+            }
+          }
+        });
   }
 
   /**
@@ -406,6 +423,16 @@ public Slide getActiveSlide() {
     return activeSlide;
   }
 
+  @Override
+  public CarouselConfig getOwnConfig() {
+    return carouselConfig;
+  }
+
+  public Carousel setConfig(CarouselConfig config) {
+    this.carouselConfig = config;
+    return this;
+  }
+
   public enum SlideDirection {
     NONE,
     /** CSS class for previous indicator */

domino-ui/src/main/java/org/dominokit/domino/ui/config/CarouselConfig.java

@@ -0,0 +1,23 @@
+/*
+ * Copyright © 2019 Dominokit
+ *
+ * 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 org.dominokit.domino.ui.config;
+
+public interface CarouselConfig extends ComponentConfig {
+  /** @return boolean, true to allow scrolling a carousel with mouse scroll wheel. */
+  default boolean isScrollCarouselWithWheel() {
+    return false;
+  }
+}

domino-ui/src/main/java/org/dominokit/domino/ui/config/UIConfig.java

@@ -31,4 +31,5 @@ public interface UIConfig
         CalendarConfig,
         TimePickerConfig,
         DelayedActionConfig,
-        DatatableConfig {}
+        DatatableConfig,
+        CarouselConfig {}