TextArea.java

package org.gwtbootstrap3.client.ui;

/*
 * #%L
 * GwtBootstrap3
 * %%
 * Copyright (C) 2013 GwtBootstrap3
 * %%
 * 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.
 * #L%
 */

import org.gwtbootstrap3.client.ui.base.TextBoxBase;
import org.gwtbootstrap3.client.ui.constants.Styles;
import org.gwtbootstrap3.client.ui.gwt.Widget;

import com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.TextAreaElement;
import com.google.gwt.user.client.ui.RootPanel;

public class TextArea extends TextBoxBase {

    /**
     * Creates a TextArea widget that wraps an existing <textarea>
     * element.
     * <p/>
     * 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
     * @return TextArea
     */
    public static TextArea wrap(final Element element) {
        // Assert that the element is attached.
        assert Document.get().getBody().isOrHasChild(element);

        final TextArea textArea = new TextArea(element);

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

        return textArea;
    }

    /**
     * Creates an empty text area.
     */
    public TextArea() {
        super(Document.get().createTextAreaElement());
        setStyleName(Styles.FORM_CONTROL);
    }

    /**
     * This constructor may be used by subclasses to explicitly use an existing
     * element. This element must be a <textarea> element.
     *
     * @param element the element to be used
     */
    protected TextArea(final Element element) {
        super(element.<Element>cast());
        TextAreaElement.as(element);
        element.addClassName(Styles.FORM_CONTROL);
    }

    /**
     * Gets the requested width of the text box (this is not an exact value, as
     * not all characters are created equal).
     *
     * @return the requested width, in characters
     */
    public int getCharacterWidth() {
        return getTextAreaElement().getCols();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public int getCursorPos() {
        return getImpl().getTextAreaCursorPos(getElement());
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public int getSelectionLength() {
        return getImpl().getTextAreaSelectionLength(getElement());
    }

    /**
     * Gets the number of text lines that are visible.
     *
     * @return the number of visible lines
     */
    public int getVisibleLines() {
        return getTextAreaElement().getRows();
    }

    /**
     * Sets the requested width of the text box (this is not an exact value, as
     * not all characters are created equal).
     *
     * @param width the requested width, in characters
     */
    public void setCharacterWidth(final int width) {
        getTextAreaElement().setCols(width);
    }

    /**
     * Sets the number of text lines that are visible.
     *
     * @param lines the number of visible lines
     */
    public void setVisibleLines(final int lines) {
        getTextAreaElement().setRows(lines);
    }

    /**
     * Get the TextAreaElement for the widget
     *
     * @return TextAreaElement element of the widget
     */
    private TextAreaElement getTextAreaElement() {
        return getElement().cast();
    }

    /**
     * Clear the value
     */
    public void clear() {
        super.setValue(null);
    }
}