com.vaadin.client.ui.image.ImageConnector Maven / Gradle / Ivy

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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 (C) 2000-2024 Vaadin Ltd
 *
 * This program is available under Vaadin Commercial License and Service Terms.
 *
 * See  for the full
 * license.
 */
package com.vaadin.client.ui.image;

import com.google.gwt.dom.client.NativeEvent;
import com.google.gwt.event.dom.client.LoadEvent;
import com.vaadin.client.communication.StateChangeEvent;
import com.vaadin.client.ui.AbstractComponentConnector;
import com.vaadin.client.ui.ClickEventHandler;
import com.vaadin.client.ui.VImage;
import com.vaadin.shared.MouseEventDetails;
import com.vaadin.shared.ui.AbstractEmbeddedState;
import com.vaadin.shared.ui.Connect;
import com.vaadin.shared.ui.image.ImageServerRpc;
import com.vaadin.shared.ui.image.ImageState;

/**
 * A connector class for the Image component.
 *
 * @author Vaadin Ltd
 */
@Connect(com.vaadin.ui.Image.class)
public class ImageConnector extends AbstractComponentConnector {

    @Override
    protected void init() {
        super.init();
        getWidget().addHandler(
                event -> getLayoutManager()
                        .setNeedsMeasure(ImageConnector.this),
                LoadEvent.getType());
    }

    @Override
    public VImage getWidget() {
        return (VImage) super.getWidget();
    }

    @Override
    public ImageState getState() {
        return (ImageState) super.getState();
    }

    @Override
    public void onStateChanged(StateChangeEvent stateChangeEvent) {
        super.onStateChanged(stateChangeEvent);

        clickEventHandler.handleEventHandlerRegistration();

        String url = getResourceUrl(AbstractEmbeddedState.SOURCE_RESOURCE);
        getWidget().setUrl(url != null ? url : "");

        String alt = getState().alternateText;
        // Some browsers turn a null alt text into a literal "null"
        getWidget().setAltText(alt != null ? alt : "");
    }

    /** Click event handler for sending click data to the server. */
    protected final ClickEventHandler clickEventHandler = new ClickEventHandler(
            this) {

        @Override
        protected void fireClick(NativeEvent event,
                MouseEventDetails mouseDetails) {
            getRpcProxy(ImageServerRpc.class).click(mouseDetails);
        }

    };

}