com.google.gwt.dom.client.EventTarget.java Source code

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Here is the source code for com.google.gwt.dom.client.EventTarget.java

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/*
 * Copyright 2009 Google Inc.
 * 
 * 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.google.gwt.dom.client;

import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.core.client.JavascriptObjectEquivalent;

/**
 * Represents the target of a JavaScript event.
 * 
 * <p>
 * This type is returned from methods such as
 * {@link NativeEvent#getEventTarget()}, and must usually be cast to another
 * type using methods such as {@link Element#is(JavaScriptObject)} and
 * {@link Element#as(JavaScriptObject)}.
 * </p>
 * 
 * <p>
 * This class intentionally does <em>not</em> specify the methods from the DOM
 * IDL (dispatchEvent, addEventListener, and removeEventListener).
 * </p>
 */
public class EventTarget implements JavascriptObjectEquivalent {
    private JavaScriptObject nativeTarget;

    EventTarget(JavaScriptObject nativeTarget) {
        this.nativeTarget = nativeTarget;
    }

    @Override
    public <T extends JavascriptObjectEquivalent> T cast() {
        if (ElementRemote.is(nativeTarget)) {
            return (T) LocalDom.nodeFor(nativeTarget);
        }
        throw new FixmeUnsupportedOperationException();
    }

    public boolean is(Class<? extends JavascriptObjectEquivalent> clazz) {
        if (clazz == Element.class && ElementRemote.is(nativeTarget)) {
            return true;
        }
        return false;
    }

    @Override
    public String toString() {
        return super.toString() + ":" + nativeTarget;
    }
}