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using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace UVtools.GUI.Controls
{
/// <summary>
/// This class is an implementation of the 'IComparer' interface.
/// </summary>
public class ListViewColumnSorter : IComparer
{
/// <summary>
/// Case insensitive comparer object
/// </summary>
private readonly CaseInsensitiveComparer _objectCompare;
/// <summary>
/// Gets or sets the number of the column to which to apply the sorting operation (Defaults to '0').
/// </summary>
public int SortColumn { set; get; }
/// <summary>
/// Gets or sets the order of sorting to apply (for example, 'Ascending' or 'Descending').
/// </summary>
public SortOrder Order { set; get; }
/// <summary>
/// Class constructor. Initializes various elements
/// </summary>
public ListViewColumnSorter()
{
// Initialize the column to '0'
SortColumn = 0;
// Initialize the sort order to 'none'
Order = SortOrder.None;
// Initialize the CaseInsensitiveComparer object
_objectCompare = new CaseInsensitiveComparer();
}
/// <summary>
/// This method is inherited from the IComparer interface. It compares the two objects passed using a case insensitive comparison.
/// </summary>
/// <param name="x">First object to be compared</param>
/// <param name="y">Second object to be compared</param>
/// <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>
public int Compare(object x, object y)
{
// Cast the objects to be compared to ListViewItem objects
var listviewX = (ListViewItem)x;
var listviewY = (ListViewItem)y;
// Compare the two items
var compareResult = _objectCompare.Compare(listviewX.SubItems[SortColumn].Text, listviewY.SubItems[SortColumn].Text);
switch (Order)
{
// Calculate correct return value based on object comparison
case SortOrder.Ascending:
// Ascending sort is selected, return normal result of compare operation
return compareResult;
case SortOrder.Descending:
// Descending sort is selected, return negative result of compare operation
return (-compareResult);
default:
// Return '0' to indicate they are equal
return 0;
}
}
}
}
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