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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.label;

import com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.PreElement;
import com.vaadin.client.Profiler;
import com.vaadin.client.WidgetUtil;
import com.vaadin.client.communication.StateChangeEvent;
import com.vaadin.client.ui.AbstractComponentConnector;
import com.vaadin.client.ui.VLabel;
import com.vaadin.shared.ui.Connect;
import com.vaadin.shared.ui.Connect.LoadStyle;
import com.vaadin.shared.ui.label.LabelState;
import com.vaadin.ui.Label;

/**
 * A connector class for the Label component. Eagerly loaded.
 *
 * @author Vaadin Ltd
 */
@Connect(value = Label.class, loadStyle = LoadStyle.EAGER)
public class LabelConnector extends AbstractComponentConnector {

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

    @Override
    public void onStateChanged(StateChangeEvent stateChangeEvent) {
        super.onStateChanged(stateChangeEvent);
        boolean sinkOnloads = false;
        Profiler.enter("LabelConnector.onStateChanged update content");
        VLabel widget = getWidget();
        switch (getState().contentMode) {
        case PREFORMATTED:
            PreElement preElement = Document.get().createPreElement();
            preElement.setInnerText(getState().text);
            // clear existing content
            widget.setHTML("");
            // add preformatted text to dom
            widget.getElement().appendChild(preElement);
            break;

        case TEXT:
            widget.setText(getState().text);
            break;

        case HTML:
            sinkOnloads = true;
            widget.setHTML(getState().text);
            break;
        default:
            throw new IllegalStateException(
                    "A new content mode has been added without configuring handling for it: "
                            + getState().contentMode.name());
        }
        Profiler.leave("LabelConnector.onStateChanged update content");

        if (sinkOnloads) {
            Profiler.enter("LabelConnector.onStateChanged sinkOnloads");
            WidgetUtil.sinkOnloadForImages(widget.getElement());
            Profiler.leave("LabelConnector.onStateChanged sinkOnloads");
        }
    }

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

}