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using Quasar.Server.Models;
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using System.Collections;
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using System.Windows.Forms;
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namespace Quasar.Server.Utilities
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{
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public class ListViewColumnSorter : 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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/// Specifies if number or text comparision is needed
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/// </summary>
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private bool _needNumberCompare;
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/// <summary>
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/// Class constructor. Initializes various elements
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/// </summary>
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public ListViewColumnSorter()
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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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_needNumberCompare = false;
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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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// 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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if (listviewX.SubItems[0].Text == ".." || listviewY.SubItems[0].Text == "..")
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return 0;
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// Compare the two items
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int compareResult;
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if (_needNumberCompare)
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{
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long a, b;
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if (listviewX.Tag is FileManagerListTag)
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{
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// fileSize to be compared
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a = (listviewX.Tag as FileManagerListTag).FileSize;
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b = (listviewY.Tag as FileManagerListTag).FileSize;
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compareResult = a >= b ? (a == b ? 0 : 1) : -1;
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}
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else
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{
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if (long.TryParse(listviewX.SubItems[_columnToSort].Text, out a)
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&& long.TryParse(listviewY.SubItems[_columnToSort].Text, out b))
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{
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compareResult = a >= b ? (a == b ? 0 : 1) : -1;
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}
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else
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{
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compareResult = _objectCompare.Compare(listviewX.SubItems[_columnToSort].Text,
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listviewY.SubItems[_columnToSort].Text);
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}
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}
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}
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else
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{
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compareResult = _objectCompare.Compare(listviewX.SubItems[_columnToSort].Text,
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listviewY.SubItems[_columnToSort].Text);
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}
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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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else 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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else
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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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}
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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 { _columnToSort = value; }
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get { return _columnToSort; }
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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 { _orderOfSort = value; }
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get { return _orderOfSort; }
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}
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/// <summary>
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/// Specifies if number or text comparision is needed.
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/// </summary>
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public bool NeedNumberCompare
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{
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set { _needNumberCompare = value; }
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get { return _needNumberCompare; }
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}
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}
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}
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