CODEWITHSUNDEEP
.netuser-interfacepowershelllistbox
Jeff Bolduan
Jeff Bolduan

Reputation: 103

Powershell: How to change listbox item colors as well as change them when selected

Here's what I have so far:

foreach($group in $userBGroups.Items) {
    if($_.State -eq 'Selected') {
        try {
            $brush = New-Object System.Drawing.SolidBrush([System.Drawing.Color]::LightBlue)
            $_.Graphics.FillRectangle($brush, $_.bounds)
        } finally {
            $brush.Dispose()
        }
    } elseif($group -eq $lbItem) {
        try {
            $brush = New-Object System.Drawing.SolidBrush([System.Drawing.Color]::LightGreen)
            $_.Graphics.FillRectangle($brush, $_.Bounds)
        } finally {
            $brush.Dispose()
        }
    }
}

This works for the most part aside from the case where you want to select an item which is already colored green, it seems like it must be selecting it for a brief second then immediately it reverts to green. I'm lost as to what could be causing this behavior.

I do know that if I add "or" statements to the 'Selected' logic to look for NoAccelerator I do end up coloring all rows light blue and then when I click on them they either highlight a darker blue or the light green if they would have been that color without NoAccelerator.

Upvotes: 1

Views: 1698

Answers (1)

Jeff Bolduan
Jeff Bolduan

Reputation: 103

So I managed to figure out a solution to my problem. I modified my DrawItem event to look like the following:

$userBGroups_DrawItem=[System.Windows.Forms.DrawItemEventHandler]{
    #Event Argument: $_ = [System.Windows.Forms.DrawItemEventArgs]
    if($userBGroups.Items.Count -eq 0) {return}
    $_.DrawBackground()
    $lbItem = $userBGroups.Items[$_.Index]
    $itemBGColor = [System.Drawing.Color]::White

    if($userBGroups.SelectedItems.Contains($lbItem)) {
        $itemBGColor = [System.Drawing.Color]::LightBlue
    } else {
        if($userBGroups.Items -contains $lbItem) {
            $itemBGColor = [System.Drawing.Color]::LightGreen
        } else {
            $itemBGColor = [System.Drawing.Color]::White
        }
    }

    try {
        $brush = New-Object System.Drawing.SolidBrush($itemBGColor)
        $_.Graphics.FillRectangle($brush, $_.Bounds)
    } finally {
        $brush.Dispose
    }
    $_.Graphics.DrawString($lbItem, $_.Font, [System.Drawing.SystemBrushes]::ControlText, (New-Object System.Drawing.PointF($_.Bounds.X, $_.Bounds.Y)))
}

The key was that this code worked but was missing something. Whenever I selected an item then selected a different item I would still keep the previous selection. To resolve this I made the following selection changed event:

$userBGroups_SelectedValueChanged={
    $userBGroups.Refresh()
}

It causes a flashing to occur after selecting an item when it redraws but is workable until I can figure out if there's a way to resolve that.

Upvotes: 1

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