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
020package org.crsh.text.ui;
021
022import org.crsh.text.LineRenderer;
023import org.crsh.text.Style;
024import org.crsh.util.Utils;
025
026import java.util.Iterator;
027
028public class TextElement extends Element {
029
030  /** . */
031  final Iterable<Object> stream;
032
033  /** . */
034  final int minWidth;
035
036  /** . */
037  final int width;
038
039  private static int width(int width, Iterator<Object> stream, CharSequence current, Integer from) {
040    while (current == null) {
041      if (stream.hasNext()) {
042        Object next = stream.next();
043        if (next instanceof CharSequence) {
044          current = (CharSequence)next;
045          from = 0;
046        }
047      } else {
048        break;
049      }
050    }
051    if (current == null) {
052      return width;
053    } else {
054      int pos = Utils.indexOf(current, from, '\n');
055      if (pos == -1) {
056        return width(width + current.length() - from, stream, current, from);
057      } else {
058        return Math.max(width + pos - from, width(0, stream, null, 0));
059      }
060    }
061  }
062
063  public TextElement(Iterable<Object> stream, int minWidth) {
064    if (minWidth < 0) {
065      throw new IllegalArgumentException("No negative min size allowed");
066    }
067
068    // Determine width
069    int width = width(0, stream.iterator(), null, null);
070
071    //
072    this.minWidth = Math.min(width, minWidth);
073    this.stream = stream;
074    this.width = width;
075  }
076
077  public TextElement(Iterable<Object> stream) {
078    this(stream, 1);
079  }
080
081  public LineRenderer renderer() {
082    // return new LabelRenderer(this);
083    throw new UnsupportedOperationException();
084  }
085
086  @Override
087  public String toString() {
088    return "TextElement[]";
089  }
090
091  @Override
092  public TextElement style(Style.Composite style) {
093    return (TextElement)super.style(style);
094  }
095}