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Vaadin is a web application framework for Rich Internet Applications (RIA). Vaadin enables easy development and maintenance of fast and secure rich web applications with a stunning look and feel and a wide browser support. It features a server-side architecture with the majority of the logic running on the server. Ajax technology is used at the browser-side to ensure a rich and interactive user experience.

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/*
 * Copyright 2000-2013 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.user.client.DOM;
import com.google.gwt.user.client.Event;
import com.google.gwt.user.client.ui.UIObject;
import com.vaadin.client.ApplicationConnection;

public class Icon extends UIObject {
    public static final String CLASSNAME = "v-icon";
    private final ApplicationConnection client;
    private String myUri;

    public Icon(ApplicationConnection client) {
        setElement(DOM.createImg());
        DOM.setElementProperty(getElement(), "alt", "");
        setStyleName(CLASSNAME);
        this.client = client;
    }

    public Icon(ApplicationConnection client, String uidlUri) {
        this(client);
        setUri(uidlUri);
    }

    public void setUri(String uidlUri) {
        if (!uidlUri.equals(myUri)) {
            /*
             * Start sinking onload events, widgets responsibility to react. We
             * must do this BEFORE we set src as IE fires the event immediately
             * if the image is found in cache (#2592).
             */
            sinkEvents(Event.ONLOAD);

            String uri = client.translateVaadinUri(uidlUri);
            DOM.setElementProperty(getElement(), "src", uri);
            myUri = uidlUri;
        }
    }

    /**
     * Sets the alternate text for the icon.
     * 
     * @param alternateText
     *            with the alternate text.
     */
    public void setAlternateText(String alternateText) {
        getElement().setAttribute("alt",
                alternateText == null ? "" : alternateText);
    }

}