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133 lines
No EOL
4.4 KiB
C#
133 lines
No EOL
4.4 KiB
C#
/*
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* Greenshot - a free and open source screenshot tool
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* Copyright (C) 2007-2015 Thomas Braun, Jens Klingen, Robin Krom
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*
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* For more information see: http://getgreenshot.org/
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* The Greenshot project is hosted on Sourceforge: http://sourceforge.net/projects/greenshot/
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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using System.Collections;
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using System.Windows.Forms;
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namespace GreenshotPlugin.Controls
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{
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/// <summary>
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/// This class is an implementation of the 'IComparer' interface.
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/// </summary>
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internal class GreenshotColumnSorter : IComparer
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{
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/// <summary>
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/// Specifies the column to be sorted
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/// </summary>
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private int _columnToSort;
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/// <summary>
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/// Specifies the order in which to sort (i.e. 'Ascending').
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/// </summary>
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private SortOrder _orderOfSort;
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/// <summary>
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/// Case insensitive comparer object
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/// </summary>
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private readonly CaseInsensitiveComparer _objectCompare;
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/// <summary>
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/// Class constructor. Initializes various elements
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/// </summary>
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public GreenshotColumnSorter()
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{
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// Initialize the column to '0'
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_columnToSort = 0;
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// Initialize the sort order to 'none'
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_orderOfSort = SortOrder.None;
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// Initialize the CaseInsensitiveComparer object
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_objectCompare = new CaseInsensitiveComparer();
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}
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/// <summary>
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/// This method is inherited from the IComparer interface. It compares the two objects passed using a case insensitive comparison.
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/// </summary>
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/// <param name="x">First object to be compared</param>
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/// <param name="y">Second object to be compared</param>
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/// <returns>The result of the comparison. "0" if equal, negative if 'x' is less than 'y' and positive if 'x' is greater than 'y'</returns>
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public int Compare(object x, object y)
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{
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if (x == null && y == null)
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{
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return 0;
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}
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if (x == null)
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{
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return -1;
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}
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if (y == null)
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{
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return 1;
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}
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// Cast the objects to be compared to ListViewItem objects
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var listviewX = (ListViewItem)x;
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var listviewY = (ListViewItem)y;
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// Compare the two items
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var compareResult = _objectCompare.Compare(listviewX.SubItems[_columnToSort].Text, listviewY.SubItems[_columnToSort].Text);
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// Calculate correct return value based on object comparison
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if (_orderOfSort == SortOrder.Ascending)
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{
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// Ascending sort is selected, return normal result of compare operation
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return compareResult;
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}
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if (_orderOfSort == SortOrder.Descending)
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{
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// Descending sort is selected, return negative result of compare operation
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return (-compareResult);
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}
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// Return '0' to indicate they are equal
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return 0;
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}
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/// <summary>
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/// Gets or sets the number of the column to which to apply the sorting operation (Defaults to '0').
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/// </summary>
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public int SortColumn
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{
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set
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{
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_columnToSort = value;
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}
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get
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{
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return _columnToSort;
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}
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}
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/// <summary>
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/// Gets or sets the order of sorting to apply (for example, 'Ascending' or 'Descending').
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/// </summary>
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public SortOrder Order
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{
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set
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{
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_orderOfSort = value;
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}
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get
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{
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return _orderOfSort;
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}
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}
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}
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} |