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- /*
- * Copyright 2000-2018 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.client.ui;
-
- import com.google.gwt.core.client.JavaScriptObject;
- import com.google.gwt.dom.client.Element;
- import com.google.gwt.user.client.Event;
- import com.google.gwt.user.client.ui.Widget;
-
- /**
- * A mousewheel handling class to get around the limits of
- * {@link Event#ONMOUSEWHEEL}.
- *
- * For internal use only. May be removed or replaced in the future.
- *
- * @see com.vaadin.client.widgets.JsniWorkaround JsniWorkaround
- */
- // FIXME remove the copy in v7 package
- abstract class JsniMousewheelHandler {
-
- /**
- * A JavaScript function that handles the mousewheel DOM event, and passes
- * it on to Java code.
- *
- * @see #createMousewheelListenerFunction(Widget)
- */
- protected final JavaScriptObject mousewheelListenerFunction;
-
- protected JsniMousewheelHandler(final Widget widget) {
- mousewheelListenerFunction = createMousewheelListenerFunction(widget);
- }
-
- /**
- * A method that constructs the JavaScript function that will be stored into
- * {@link #mousewheelListenerFunction}.
- *
- * @param widget
- * a reference to the current instance of {@link Widget}
- */
- protected abstract JavaScriptObject createMousewheelListenerFunction(
- Widget widget);
-
- public native void attachMousewheelListener(Element element)
- /*-{
- if (element.addEventListener) {
- // FireFox likes "wheel", while others use "mousewheel"
- var eventName = 'onmousewheel' in element ? 'mousewheel' : 'wheel';
- element.addEventListener(eventName, this.@com.vaadin.client.ui.JsniMousewheelHandler::mousewheelListenerFunction);
- }
- }-*/;
-
- public native void detachMousewheelListener(Element element)
- /*-{
- if (element.addEventListener) {
- // FireFox likes "wheel", while others use "mousewheel"
- var eventName = element.onwheel===undefined?"mousewheel":"wheel";
- element.removeEventListener(eventName, this.@com.vaadin.client.ui.JsniMousewheelHandler::mousewheelListenerFunction);
- }
- }-*/;
-
- }
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