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/*
* This library is part of OpenCms -
* the Open Source Content Management System
*
* Copyright (c) Alkacon Software GmbH (http://www.alkacon.com)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* For further information about Alkacon Software, please see the
* company website: http://www.alkacon.com
*
* For further information about OpenCms, please see the
* project website: http://www.opencms.org
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package org.opencms.gwt.client.ui.input;
import org.opencms.gwt.client.ui.I_CmsTruncable;
import org.opencms.gwt.client.ui.css.I_CmsInputCss;
import org.opencms.gwt.client.ui.css.I_CmsInputLayoutBundle;
import org.opencms.gwt.client.ui.css.I_CmsLayoutBundle;
import org.opencms.gwt.client.util.CmsDomUtil;
import java.util.List;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.Style.Unit;
import com.google.gwt.user.client.ui.Label;
/**
* Single line label with text truncation and tool tip.
*
* @since 8.0.0
*/
public class CmsLabel extends Label implements I_CmsTruncable {
/**
* Interface for generating HTML titles (tooltips) for a label.
*/
public interface I_TitleGenerator {
/**
* Should return the title, or null if no title should be displayed.
*
* @param originalText the original untruncated text stored in the label
*
* @return the title to display, or null if no title should be displayed
*/
String getTitle(String originalText);
}
/** The CSS bundle instance used for this widget.
*/
protected static final I_CmsInputCss CSS = I_CmsInputLayoutBundle.INSTANCE.inputCss();
/** List of elements to measure. */
protected static List m_elements;
/** The original untruncated text stored in the label. */
protected String m_originalText;
/** The title generator. */
private I_TitleGenerator m_titleGenerator;
/**
* Creates an empty label.
*/
public CmsLabel() {
setStyleName(I_CmsLayoutBundle.INSTANCE.generalCss().truncatingLabel());
}
/**
* Creates an empty label using the given element.
*
* @param element the element to use
*/
public CmsLabel(Element element) {
super(element);
setStyleName(I_CmsLayoutBundle.INSTANCE.generalCss().truncatingLabel());
}
/**
* Creates a label with the specified text.
*
* @param text the new label's text
*/
public CmsLabel(String text) {
super(text);
setStyleName(I_CmsLayoutBundle.INSTANCE.generalCss().truncatingLabel());
}
/**
* @see com.google.gwt.user.client.ui.Widget#onAttach()
*/
@Override
public void onAttach() {
// just for visibility
super.onAttach();
}
/**
* Sets the inner HTML of the label.
*
* Avoid using this, better use {@link #setText(String)}
*
* @param html the HTML to set
*/
public void setHTML(String html) {
getElement().setInnerHTML(html);
}
/**
* @see com.google.gwt.user.client.ui.HasText#setText(java.lang.String)
*/
@Override
public void setText(String text) {
super.setText(text);
m_originalText = text;
setTitle(getTitle(true));
}
/**
* Sets the title generator.
*
* @param titleGen the new title generator
*/
public void setTitleGenerator(I_TitleGenerator titleGen) {
m_titleGenerator = titleGen;
}
/**
* @see org.opencms.gwt.client.ui.I_CmsTruncable#truncate(java.lang.String, int)
*/
public void truncate(String textMetricsKey, int labelWidth) {
if (labelWidth > 0) {
getElement().getStyle().setWidth(labelWidth, Unit.PX);
}
}
/**
* Updates the title.
*
* @param truncating true if the label is being truncated
*/
public void updateTitle(boolean truncating) {
String title = getTitle(truncating);
Element element = getElement();
if (title == null) {
element.removeAttribute(CmsDomUtil.Attribute.title.name());
} else {
element.setAttribute(CmsDomUtil.Attribute.title.name(), title);
}
}
/**
* Returns the title to be displayed, which is either produced by a title generator,
* or is equal to the original text if no title generator is set and the label is being
* truncated.
*
* @param truncating true if the label is being truncated
*
* @return the title to display
*/
protected String getTitle(boolean truncating) {
if (m_titleGenerator != null) {
return m_titleGenerator.getTitle(m_originalText);
}
if (truncating) {
return getText();
} else {
return super.getTitle();
}
}
}