WinFormPS

1.0.0

Public/Set-WFListViewColumn.ps1

function Set-WFListViewColumn
{
    <#
    .SYNOPSIS
        Sort the ListView's item using the specified column.
 
    .DESCRIPTION
        Sort the ListView's item using the specified column.
        This function uses Add-Type to define a class that sort the items.
        The ListView's Tag property is used to keep track of the sorting.
 
    .PARAMETER ListView
        The ListView control to sort.
 
    .PARAMETER ColumnIndex
        The index of the column to use for sorting.
         
    .PARAMETER SortOrder
        The direction to sort the items. If not specified or set to None, it will toggle.
     
    .EXAMPLE
        Set-WFListViewColumn -ListView $listview1 -ColumnIndex 0
     
    .NOTES
        SAPIEN Technologies, Inc.
        http://www.sapien.com/
#>
    param (
        [ValidateNotNull()]
        [Parameter(Mandatory = $true)]
        [System.Windows.Forms.ListView]$ListView,
        
        [Parameter(Mandatory = $true)]
        [int]$ColumnIndex,
        
        [System.Windows.Forms.SortOrder]$SortOrder = 'None')
    
    if (($ListView.Items.Count -eq 0) -or ($ColumnIndex -lt 0) -or ($ColumnIndex -ge $ListView.Columns.Count))
    {
        return;
    }
    
    #region Define ListViewItemComparer
    try
    {
        #$local:type = [ListViewItemComparer]
    }
    catch
    {
        Add-Type -ReferencedAssemblies ('System.Windows.Forms') -TypeDefinition  @"
    using System;
    using System.Windows.Forms;
    using System.Collections;
    public class ListViewItemComparer : IComparer
    {
        public int column;
        public SortOrder sortOrder;
        public ListViewItemComparer()
        {
            column = 0;
            sortOrder = SortOrder.Ascending;
        }
        public ListViewItemComparer(int column, SortOrder sort)
        {
            this.column = column;
            sortOrder = sort;
        }
        public int Compare(object x, object y)
        {
            if(column >= ((ListViewItem)x).SubItems.Count)
                return sortOrder == SortOrder.Ascending ? -1 : 1;
         
            if(column >= ((ListViewItem)y).SubItems.Count)
                return sortOrder == SortOrder.Ascending ? 1 : -1;
         
            if(sortOrder == SortOrder.Ascending)
                return String.Compare(((ListViewItem)x).SubItems[column].Text, ((ListViewItem)y).SubItems[column].Text);
            else
                return String.Compare(((ListViewItem)y).SubItems[column].Text, ((ListViewItem)x).SubItems[column].Text);
        }
    }
"@ | Out-Null
    }
    #endregion
    
    if ($ListView.Tag -is [ListViewItemComparer])
    {
        #Toggle the Sort Order
        if ($SortOrder -eq [System.Windows.Forms.SortOrder]::None)
        {
            if ($ListView.Tag.column -eq $ColumnIndex -and $ListView.Tag.sortOrder -eq 'Ascending')
            {
                $ListView.Tag.sortOrder = 'Descending'
            }
            else
            {
                $ListView.Tag.sortOrder = 'Ascending'
            }
        }
        else
        {
            $ListView.Tag.sortOrder = $SortOrder
        }
        
        $ListView.Tag.column = $ColumnIndex
        $ListView.Sort() #Sort the items
    }
    else
    {
        if ($SortOrder -eq [System.Windows.Forms.SortOrder]::None)
        {
            $SortOrder = [System.Windows.Forms.SortOrder]::Ascending
        }
        
        #Set to Tag because for some reason in PowerShell ListViewItemSorter prop returns null
        $ListView.Tag = New-Object ListViewItemComparer ($ColumnIndex, $SortOrder)
        $ListView.ListViewItemSorter = $ListView.Tag #Automatically sorts
    }
}