EPPlus/Style/ExcelBorderItem.cs

/*******************************************************************************
 * You may amend and distribute as you like, but don't remove this header!
 *
 * EPPlus provides server-side generation of Excel 2007/2010 spreadsheets.
 * See http://www.codeplex.com/EPPlus for details.
 *
 * Copyright (C) 2011  Jan Källman
 *
 * 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.
 *
 * The GNU Lesser General Public License can be viewed at http://www.opensource.org/licenses/lgpl-license.php
 * If you unfamiliar with this license or have questions about it, here is an http://www.gnu.org/licenses/gpl-faq.html
 *
 * All code and executables are provided "as is" with no warranty either express or implied.
 * The author accepts no liability for any damage or loss of business that this product may cause.
 *
 * Code change notes:
 *
 * Author							Change						Date
 * ******************************************************************************
 * Jan Källman		                Initial Release		        2009-10-01
 * Jan Källman		License changed GPL-->LGPL 2011-12-16
 *******************************************************************************/

using System;
using OfficeOpenXml.Style.XmlAccess;

namespace OfficeOpenXml.Style;

/// <summary>
/// Cell border style
/// </summary>
public sealed class ExcelBorderItem : StyleBase {
  private readonly eStyleClass _cls;
  private readonly StyleBase _parent;

  internal ExcelBorderItem(
      ExcelStyles styles,
      XmlHelper.ChangedEventHandler changedEvent,
      int worksheetId,
      string address,
      eStyleClass cls,
      StyleBase parent)
      : base(styles, changedEvent, worksheetId, address) {
    _cls = cls;
    _parent = parent;
  }

  /// <summary>
  /// The line style of the border
  /// </summary>
  public ExcelBorderStyle Style {
    get => GetSource().Style;
    set => _ChangedEvent(this, new(_cls, eStyleProperty.Style, value, _positionID, _address));
  }

  private ExcelColor _color;

  /// <summary>
  /// The color of the border
  /// </summary>
  public ExcelColor Color {
    get {
      if (_color == null) {
        _color = new(_styles, _ChangedEvent, _positionID, _address, _cls, _parent);
      }
      return _color;
    }
  }

  internal override string Id => Style + Color.Id;

  internal override void SetIndex(int index) {
    _parent.Index = index;
  }

  private ExcelBorderItemXml GetSource() {
    int ix = _parent.Index < 0 ? 0 : _parent.Index;

    switch (_cls) {
      case eStyleClass.BorderTop:
        return _styles.Borders[ix].Top;
      case eStyleClass.BorderBottom:
        return _styles.Borders[ix].Bottom;
      case eStyleClass.BorderLeft:
        return _styles.Borders[ix].Left;
      case eStyleClass.BorderRight:
        return _styles.Borders[ix].Right;
      case eStyleClass.BorderDiagonal:
        return _styles.Borders[ix].Diagonal;
      default:
        throw new("Invalid class for Borderitem");
    }
  }
}