001    /*
002     * Copyright (C) 2012 eXo Platform SAS.
003     *
004     * This is free software; you can redistribute it and/or modify it
005     * under the terms of the GNU Lesser General Public License as
006     * published by the Free Software Foundation; either version 2.1 of
007     * the License, or (at your option) any later version.
008     *
009     * This software is distributed in the hope that it will be useful,
010     * but WITHOUT ANY WARRANTY; without even the implied warranty of
011     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012     * Lesser General Public License for more details.
013     *
014     * You should have received a copy of the GNU Lesser General Public
015     * License along with this software; if not, write to the Free
016     * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
017     * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
018     */
019    
020    package org.crsh.text.ui;
021    
022    import org.crsh.text.LineReader;
023    import org.crsh.text.RenderAppendable;
024    import org.crsh.text.Style;
025    import org.crsh.util.BlankSequence;
026    import org.crsh.util.Pair;
027    
028    class LabelReader implements LineReader {
029    
030      /** . */
031      private final LabelElement element;
032    
033      /** . */
034      private final Pair<Integer, Integer>[] lines;
035    
036      /** . */
037      private final int width;
038    
039      /** . */
040      private final int height;
041    
042      LabelReader(LabelElement element, Pair<Integer, Integer>[] lines, int width, int height) {
043        this.element = element;
044        this.lines = lines;
045        this.height = height;
046        this.width = width;
047      }
048    
049      /** . */
050      private int index = 0;
051    
052      public boolean hasLine() {
053        return index < height;
054      }
055    
056      public void renderLine(RenderAppendable to) {
057        if (index >= height) {
058          throw new IllegalStateException();
059        } else {
060          Style.Composite style = element.getStyle();
061          if (style != null) {
062            to.enterStyle(style);
063          }
064          if (index < lines.length) {
065            Pair<Integer, Integer> a = lines[index];
066            to.append(element.value, a.getFirst(), a.getSecond());
067            int missing = width - (a.getSecond() - a.getFirst());
068            if (missing > 0) {
069              to.append(BlankSequence.create(missing));
070            }
071          } else {
072            for (int i = 0;i < width;i++) {
073              to.append(' ');
074            }
075          }
076          index++;
077          if (style != null) {
078            to.leaveStyle();
079          }
080        }
081      }
082    }