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

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Here is the source code for com.google.gwt.user.client.ui.TextBox.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.dom.client.InputElement;

/**
 * A standard single-line text box.
 *
 * <p>
 * <img class='gallery' src='doc-files/TextBox.png'/>
 * </p>
 *
 * <h3>CSS Style Rules</h3>
 * <ul class='css'>
 * <li>.gwt-TextBox { primary style }</li>
 * <li>.gwt-TextBox-readonly { dependent style set when the text box is
 * read-only }</li>
 * </ul>
 *
 * <p>
 * <h3>Built-in Bidi Text Support</h3>
 * This widget is capable of automatically adjusting its direction according to
 * the input text. This feature is controlled by {@link #setDirectionEstimator},
 * and is available by default when at least one of the application's locales is
 * right-to-left.
 * </p>
 *
 * <p>
 * <h3>Example</h3>
 * {@example com.google.gwt.examples.TextBoxExample}
 * </p>
 */
public class TextBox extends TextBoxBase {

    /**
     * Creates a TextBox widget that wraps an existing &lt;input type='text'&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 TextBox wrap(Element element) {
        // Assert that the element is attached.
        assert Document.get().getBody().isOrHasChild(element);

        TextBox textBox = new TextBox(element);

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

        return textBox;
    }

    /**
     * Creates an empty text box.
     */
    public TextBox() {
        this(Document.get().createTextInputElement(), "gwt-TextBox");
    }

    /**
     * This constructor may be used by subclasses to explicitly use an existing
     * element. This element must be an &lt;input&gt; element whose type is
     * 'text'.
     *
     * @param element the element to be used
     */
    protected TextBox(Element element) {
        super(element);
        assert InputElement.as(element).getType().equalsIgnoreCase("text");
    }

    TextBox(Element element, String styleName) {
        super(element);
        if (styleName != null) {
            setStyleName(styleName);
        }
    }

    /**
     * Gets the maximum allowable length of the text box.
     *
     * @return the maximum length, in characters
     */
    public int getMaxLength() {
        return getInputElement().getMaxLength();
    }

    /**
     * Gets the number of visible characters in the text box.
     *
     * @return the number of visible characters
     */
    public int getVisibleLength() {
        return getInputElement().getSize();
    }

    /**
     * Sets the maximum allowable length of the text box.
     *
     * @param length the maximum length, in characters
     */
    public void setMaxLength(int length) {
        getInputElement().setMaxLength(length);
    }

    /**
     * Sets the number of visible characters in the text box.
     *
     * @param length the number of visible characters
     */
    public void setVisibleLength(int length) {
        getInputElement().setSize(length);
    }

    private InputElement getInputElement() {
        return getElement().cast();
    }
}