001/*
002 * This library is part of OpenCms -
003 * the Open Source Content Management System
004 *
005 * Copyright (c) Alkacon Software GmbH & Co. KG (http://www.alkacon.com)
006 *
007 * This library is free software; you can redistribute it and/or
008 * modify it under the terms of the GNU Lesser General Public
009 * License as published by the Free Software Foundation; either
010 * version 2.1 of the License, or (at your option) any later version.
011 *
012 * This library is distributed in the hope that it will be useful,
013 * but WITHOUT ANY WARRANTY; without even the implied warranty of
014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
015 * Lesser General Public License for more details.
016 *
017 * For further information about Alkacon Software, please see the
018 * company website: http://www.alkacon.com
019 *
020 * For further information about OpenCms, please see the
021 * project website: http://www.opencms.org
022 *
023 * You should have received a copy of the GNU Lesser General Public
024 * License along with this library; if not, write to the Free Software
025 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
026 */
027
028package org.opencms.gwt.client.ui.input;
029
030import org.opencms.gwt.client.ui.I_CmsTruncable;
031import org.opencms.gwt.client.ui.css.I_CmsConstantsBundle;
032import org.opencms.gwt.client.ui.css.I_CmsInputLayoutBundle;
033
034import com.google.gwt.canvas.client.Canvas;
035import com.google.gwt.canvas.dom.client.Context2d;
036
037/**
038 * This class represents a single select option in the selector of the select box.
039 */
040public class CmsLabelSelectCell extends A_CmsSelectCell implements I_CmsTruncable {
041
042    /** Canvas used for measuring the option size. */
043    private static final Canvas canvas = Canvas.createIfSupported();
044
045    /** The value of the select option. */
046    protected String m_value;
047
048    /** The label of which this select cell consists. */
049    private CmsLabel m_label = new CmsLabel();
050
051    /** The label width last used in a truncate()-call. */
052    private int m_labelWidth;
053
054    /** The opener text. */
055    private String m_openerText;
056
057    /** The text of the select option. */
058    private String m_text;
059
060    /** The text metrics key last used in a truncate()-call. */
061    private String m_textMetricsKey;
062
063    /**
064     * Creates a new select cell.<p>
065     *
066     * @param value the value of the select option
067     * @param text the text to display for the select option
068     */
069    public CmsLabelSelectCell(String value, String text) {
070
071        this(value, text, null);
072    }
073
074    /**
075     * Creates a new select cell.<p>
076     *
077     * @param value the value of the select option
078     * @param text the text to display for the select option
079     * @param title the title to display on mouseover
080     */
081    public CmsLabelSelectCell(String value, String text, String title) {
082
083        super();
084        m_value = value;
085        m_text = text;
086        m_openerText = text;
087        initWidget(m_label);
088        addStyleName(I_CmsInputLayoutBundle.INSTANCE.inputCss().selectBoxCell());
089        m_label.setText(m_text);
090        m_label.setTitle(title != null ? title : m_text);
091    }
092
093    /**
094     * Gets the opener text.<p>
095     *
096     * @return the opener text
097     */
098    public String getOpenerText() {
099
100        return m_openerText;
101    }
102
103    /**
104     * Measures the required width for this cell.<p>
105     *
106     * @return the required width
107     */
108    @Override
109    public int getRequiredWidth() {
110
111        Context2d context = canvas.getContext2d();
112        String fontStr = I_CmsConstantsBundle.INSTANCE.css().fontSize()
113            + " "
114            + I_CmsConstantsBundle.INSTANCE.css().fontFamily();
115        context.setFont(fontStr);
116        double width = context.measureText(getText()).getWidth();
117        return (int)(Math.ceil(width));
118    }
119
120    /**
121     * Returns the text as which the select option should be displayed to the user.<p>
122     *
123     * @return the text of the select option
124     */
125    public String getText() {
126
127        return m_text;
128    }
129
130    /**
131     * @see org.opencms.gwt.client.ui.input.A_CmsSelectCell#getValue()
132     */
133    @Override
134    public String getValue() {
135
136        return m_value;
137    }
138
139    /**
140     * Sets the opener text.<p>
141     *
142     * @param openerText the new opener text
143     */
144    public void setOpenerText(String openerText) {
145
146        m_openerText = openerText;
147    }
148
149    /**
150     * Sets the text of the label.<p>
151     *
152     * @param text the new text
153     */
154    public void setText(String text) {
155
156        m_label.setText(text);
157        m_label.setTitle(text);
158        m_text = text;
159        if (m_textMetricsKey != null) {
160            truncate(m_textMetricsKey, m_labelWidth);
161        }
162    }
163
164    /**
165     * @see org.opencms.gwt.client.ui.I_CmsTruncable#truncate(java.lang.String, int)
166     */
167    public void truncate(String textMetricsKey, int labelWidth) {
168
169        m_textMetricsKey = textMetricsKey;
170        m_labelWidth = labelWidth;
171        m_label.truncate(textMetricsKey, labelWidth);
172    }
173
174}