com.google.gwt.user.client.ui.InlineHTML.java Source code

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Here is the source code for com.google.gwt.user.client.ui.InlineHTML.java

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/*
 * Copyright 2008 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.user.client.ui;

import com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.Element;

import com.google.gwt.i18n.shared.DirectionEstimator;
import com.google.gwt.safehtml.shared.SafeHtml;

/**
 * A widget that can contain arbitrary HTML.
 *
 * This widget uses a <span> element, causing it to be displayed with
 * inline layout.
 *
 * <p>
 * If you only need a simple label (text, but not HTML), then the
 * {@link com.google.gwt.user.client.ui.Label} widget is more appropriate, as it
 * disallows the use of HTML, which can lead to potential security issues if not
 * used properly.
 * </p>
 *
 * <p>
 * <h3>Built-in Bidi Text Support</h3>
 * This widget is capable of automatically adjusting its direction according to
 * its content. This feature is controlled by {@link #setDirectionEstimator} or
 * passing a DirectionEstimator parameter to the constructor, and is off by
 * default.
 * </p>
 *
 * <h3>CSS Style Rules</h3>
 * <ul class='css'>
 * <li>.gwt-InlineHTML { }</li>
 * </ul>
 */
public class InlineHTML extends HTML {

    /**
     * Creates an InlineHTML widget that wraps an existing &lt;div&gt; or
     * &lt;span&gt; element.
     *
     * This element must already be attached to the document. If the element is
     * removed from the document, you must call
     * {@link RootPanel#detachNow(Widget)}.
     *
     * @param element the element to be wrapped
     */
    public static InlineHTML wrap(Element element) {
        // Assert that the element is attached.
        assert Document.get().getBody().isOrHasChild(element);

        InlineHTML html = new InlineHTML(element);

        // Mark it attached and remember it for cleanup.
        html.onAttach();
        RootPanel.detachOnWindowClose(html);

        return html;
    }

    /**
     * Creates an empty HTML widget.
     */
    public InlineHTML() {
        super(Document.get().createSpanElement());
        setStyleName("gwt-InlineHTML");
    }

    /**
     * Initializes the widget's HTML from a given {@link SafeHtml} object.
     *
     * @param html the new widget's HTML contents
     */
    public InlineHTML(SafeHtml html) {
        this(html.asString());
    }

    /**
     * Creates an HTML widget with the specified contents and with the
     * specified direction.
     *
     * @param html the new widget's SafeHtml contents
     * @param dir the content's direction. Note: {@code Direction.DEFAULT} means
     *        direction should be inherited from the widget's parent element.
     */
    public InlineHTML(SafeHtml html, Direction dir) {
        this(html.asString(), dir);
    }

    /**
     * Creates an HTML widget with the specified HTML contents and with a default
     * direction estimator.
     *
     * @param html the new widget's SafeHtml contents
     * @param directionEstimator A DirectionEstimator object used for automatic
     *          direction adjustment. For convenience,
     *          {@link Label#DEFAULT_DIRECTION_ESTIMATOR} can be used.
     */
    public InlineHTML(SafeHtml html, DirectionEstimator directionEstimator) {
        this();
        setDirectionEstimator(directionEstimator);
        setHTML(html);
    }

    /**
     * Creates an HTML widget with the specified HTML contents.
     *
     * @param html the new widget's HTML contents
     */
    public InlineHTML(String html) {
        this();
        setHTML(html);
    }

    /**
     * Creates an HTML widget with the specified HTML contents and with the
     * specified direction.
     *
     * @param html the new widget's HTML contents
     * @param dir the content's direction. Note: {@code Direction.DEFAULT} means
     *        direction should be inherited from the widget's parent element.
     */
    public InlineHTML(String html, Direction dir) {
        this();
        setHTML(html, dir);
    }

    /**
     * This constructor may be used by subclasses to explicitly use an existing
     * element. This element must be either a &lt;div&gt; &lt;span&gt; element.
     *
     * @param element the element to be used
     */
    protected InlineHTML(Element element) {
        // super(element) also asserts that element is either a &lt;div&gt; or
        // &lt;span&gt;.
        super(element);
    }
}