/*
* Greenshot - a free and open source screenshot tool
* Copyright (C) 2007-2013 Thomas Braun, Jens Klingen, Robin Krom
*
* For more information see: http://getgreenshot.org/
* The Greenshot project is hosted on Sourceforge: http://sourceforge.net/projects/greenshot/
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 1 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see .
*/
using System.Collections;
using System.Windows.Forms;
namespace GreenshotPlugin.Controls
{
///
/// This class is an implementation of the 'IComparer' interface.
///
public class GreenshotColumnSorter : IComparer
{
///
/// Specifies the column to be sorted
///
private int ColumnToSort;
///
/// Specifies the order in which to sort (i.e. 'Ascending').
///
private SortOrder OrderOfSort;
///
/// Case insensitive comparer object
///
private CaseInsensitiveComparer ObjectCompare;
///
/// Class constructor. Initializes various elements
///
public GreenshotColumnSorter()
{
// Initialize the column to '0'
ColumnToSort = 0;
// Initialize the sort order to 'none'
OrderOfSort = SortOrder.None;
// Initialize the CaseInsensitiveComparer object
ObjectCompare = new CaseInsensitiveComparer();
}
///
/// This method is inherited from the IComparer interface. It compares the two objects passed using a case insensitive comparison.
///
/// First object to be compared
/// Second object to be compared
/// The result of the comparison. "0" if equal, negative if 'x' is less than 'y' and positive if 'x' is greater than 'y'
public int Compare(object x, object y)
{
int compareResult;
ListViewItem listviewX, listviewY;
if (x == null && y == null)
{
return 0;
}
else if (x == null && y != null)
{
return -1;
}
else if (x != null && y == null)
{
return 1;
}
// Cast the objects to be compared to ListViewItem objects
listviewX = (ListViewItem)x;
listviewY = (ListViewItem)y;
// Compare the two items
compareResult = ObjectCompare.Compare(listviewX.SubItems[ColumnToSort].Text, listviewY.SubItems[ColumnToSort].Text);
// Calculate correct return value based on object comparison
if (OrderOfSort == SortOrder.Ascending)
{
// Ascending sort is selected, return normal result of compare operation
return compareResult;
}
else if (OrderOfSort == SortOrder.Descending)
{
// Descending sort is selected, return negative result of compare operation
return (-compareResult);
}
else
{
// Return '0' to indicate they are equal
return 0;
}
}
///
/// Gets or sets the number of the column to which to apply the sorting operation (Defaults to '0').
///
public int SortColumn
{
set
{
ColumnToSort = value;
}
get
{
return ColumnToSort;
}
}
///
/// Gets or sets the order of sorting to apply (for example, 'Ascending' or 'Descending').
///
public SortOrder Order
{
set
{
OrderOfSort = value;
}
get
{
return OrderOfSort;
}
}
}
}