functions/Show-DbaDatabaseList.ps1

function Show-DbaDatabaseList {
    <#
        .SYNOPSIS
            Shows a list of databases in a GUI.
 
        .DESCRIPTION
            Shows a list of databases in a GUI. Returns a string holding the name of the selected database. Hitting cancel returns null.
 
        .PARAMETER SqlInstance
            The SQL Server Instance to connect to..
 
        .PARAMETER SqlCredential
            Login to the target instance using alternative credentials. Windows and SQL Authentication supported. Accepts credential objects (Get-Credential)
 
        .PARAMETER Title
            Title of the window being displayed. Default is "Select Database".
 
        .PARAMETER Header
            Header text displayed above the database listing. Default is "Select the database:".
 
        .PARAMETER DefaultDb
            Specify a database to have selected when the window appears.
 
        .NOTES
            Tags: Database
            Website: https://dbatools.io
            Copyright: (C) Chrissy LeMaire, clemaire@gmail.com
            License: MIT https://opensource.org/licenses/MIT
 
        .LINK
            https://dbatools.io/Show-DbaDatabaseList
 
        .EXAMPLE
            Show-DbaDatabaseList -SqlInstance sqlserver2014a
 
            Shows a GUI list of databases using Windows Authentication to connect to the SQL Server. Returns a string of the selected database.
 
        .EXAMPLE
            Show-DbaDatabaseList -Source sqlserver2014a -SqlCredential $cred
 
            Shows a GUI list of databases using SQL credentials to connect to the SQL Server. Returns a string of the selected database.
    #>

    [CmdletBinding()]
    Param (
        [parameter(Mandatory = $true, ValueFromPipeline = $true)]
        [Alias("ServerInstance", "SqlServer")]
        [DbaInstanceParameter]$SqlInstance,
        [PSCredential]$SqlCredential,
        [string]$Title = "Select Database",
        [string]$Header = "Select the database:",
        [string]$DefaultDb
    )

    begin {
        try {
            Add-Type -AssemblyName PresentationFramework
        }
        catch {
            throw "Windows Presentation Framework required but not installed"
        }

        function Add-TreeItem {
            Param (
                [string]$name,
                [object]$parent,
                [string]$tag
            )

            $childitem = New-Object System.Windows.Controls.TreeViewItem
            $textblock = New-Object System.Windows.Controls.TextBlock
            $textblock.Margin = "5,0"
            $stackpanel = New-Object System.Windows.Controls.StackPanel
            $stackpanel.Orientation = "Horizontal"
            $image = New-Object System.Windows.Controls.Image
            $image.Height = 20
            $image.Width = 20
            $image.Stretch = "Fill"
            $image.Source = $dbicon
            $textblock.Text = $name
            $childitem.Tag = $name

            if ($name -eq $DefaultDb) {
                $childitem.IsSelected = $true
                $script:selected = $name
            }

            [void]$stackpanel.Children.Add($image)
            [void]$stackpanel.Children.Add($textblock)

            $childitem.Header = $stackpanel
            [void]$parent.Items.Add($childitem)
        }

        function Convert-b64toimg {
            param ($base64)

            $bitmap = New-Object System.Windows.Media.Imaging.BitmapImage
            $bitmap.BeginInit()
            $bitmap.StreamSource = [System.IO.MemoryStream][System.Convert]::FromBase64String($base64)
            $bitmap.EndInit()
            $bitmap.Freeze()
            return $bitmap
        }

        $dbicon = Convert-b64toimg "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAAYdEVYdFNvZnR3YXJlAHBhaW50Lm5ldCA0LjAuNWWFMmUAAAFRSURBVDhPY/j//z9VMVZBSjCCgQZunFn6/8zenv+7llf83zA75/+6WTn/N80v+L93ddP/M/tnY2jAayDIoNvn5/5/cX/t/89vdv7/9fUQGIPYj2+t/H/xyJT/O1ZUoWjCaeCOxcX///48ShSeWhMC14jXwC9Xs/5/fzHr/6/PW+GaQS78/WH9/y+Pe8DyT3fYEmcgKJw+HHECawJp/vZ60f8v95v/fzgd8P/tVtn/L1cw/n+0iOH/7TlMxBkIigBiDewr9iVsICg2qWrg6qnpA2dgW5YrYQOX9icPAQPfU9PA2S2RRLuwMtaGOAOf73X+//FyGl4DL03jIM5AEFjdH/x//+Lo/1cOlP9/dnMq2MA3x/z/312l/P/4JNH/axoU/0/INUHRhNdAEDi+pQ1cZIFcDEpvoPCaVOTwf1Gjy/9ds5MxNGAYSC2MVZB8/J8BAGcHwqQBNWHRAAAAAElFTkSuQmCC"
        $foldericon = Convert-b64toimg "iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAYAAACNiR0NAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAAYdEVYdFNvZnR3YXJlAHBhaW50Lm5ldCA0LjAuNWWFMmUAAAHaSURBVDhPY/j//z9VMVZBSjBWQUowVkFKMApnzZL+/+gYWZ4YDGeANL95sun/j3fbwPjbm5X/Pz+cRLKhcAayq2B45YKe/8vndoHx4lltYLxgajMKhumHYRQDf37Yh4J/fNry//fb1f9/v1n6/8/Tqf//3O/6/+dO9f9fV4v+fzmV/v/L0aj/lflJQO1YDAS5AmwI1MvfPyAZ9KgbYtDlvP/fzyT9/3w45P+HPT7/z8+UwG0gyDvIBmIYBnQVyDCQq0CGPV9p8v94P/f/rKQwoHYsBs4HhgfIQJjLfr+YjdOwt5tt/z9eov1/fxf3/+ggD6B2HAaCXQYKM6hhv+81oYQXzLCXq03/P5qn/H9LE/9/LycroHYsBs7oq4EYCDIM6FVshr3Z4gg2DOS6O9Nk/q+sFvlvZawD1I7FwKldleC0h2zY9wuZEMP2+aMYdn+W/P/rE0T/zy+T+q+jJg/UjsXASe1l/z/cX/T/1dn8/492ePy/vc7s/82VOv8vLVT9f3yGwv89ffL/1zXL/l9dJwF2GciwaYVy/xVlxIDasRjY31Lyv7Uy+39ZTvz/1JiA/8Hejv8dLA3+62sqgTWJC/HixDAzQBjOoBbGKkgJxipICcYqSD7+zwAAkIiWzSGuSg0AAAAASUVORK5CYII="
        $dbatoolsicon = Convert-b64toimg "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"

        $sourceserver = Connect-SqlInstance -SqlInstance $SqlInstance -SqlCredential $SqlCredential
    }

    process {
        # Create XAML form in Visual Studio, ensuring the ListView looks chromeless
        [xml]$xaml = "<Window
        xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'
        xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
        Title='$Title' SizeToContent='WidthAndHeight' Background='#F0F0F0'
        WindowStartupLocation='CenterScreen' MaxHeight='600'>
    <Grid>
        <TreeView Name='treeview' Height='Auto' Width='Auto' Background='#FFFFFF' BorderBrush='#FFFFFF' Foreground='#FFFFFF' Margin='11,36,11,79'/>
        <Label x:Name='label' Content='$header' HorizontalAlignment='Left' Margin='15,4,10,0' VerticalAlignment='Top'/>
        <StackPanel HorizontalAlignment='Right' Orientation='Horizontal' VerticalAlignment='Bottom' Margin='0,50,10,30'>
        <Button Name='okbutton' Content='OK' Margin='0,0,0,0' Width='75'/>
        <Label Width='10'/>
        <Button Name='cancelbutton' Content='Cancel' Margin='0,0,0,0' Width='75'/>
    </StackPanel>
</Grid>
</Window>"

        #second pushes it down
        # Turn XAML into PowerShell objects
        $window = [Windows.Markup.XamlReader]::Load((New-Object System.Xml.XmlNodeReader $xaml))
        $window.icon = $dbatoolsicon

        $xaml.SelectNodes("//*[@Name]") | ForEach-Object { Set-Variable -Name ($_.Name) -Value $window.FindName($_.Name) -Scope Script }

        $childitem = New-Object System.Windows.Controls.TreeViewItem
        $textblock = New-Object System.Windows.Controls.TextBlock
        $textblock.Margin = "5,0"
        $stackpanel = New-Object System.Windows.Controls.StackPanel
        $stackpanel.Orientation = "Horizontal"
        $image = New-Object System.Windows.Controls.Image
        $image.Height = 20
        $image.Width = 20
        $image.Stretch = "Fill"
        $image.Source = $foldericon
        $textblock.Text = "Databases"
        $childitem.Tag = "Databases"
        $childitem.isExpanded = $true
        [void]$stackpanel.Children.Add($image)
        [void]$stackpanel.Children.Add($textblock)
        $childitem.Header = $stackpanel
        $databaseParent = $treeview.Items.Add($childitem)

        try {
            $databases = $sourceserver.databases.name
        }
        catch {
            return
        }

        foreach ($database in $databases) {
            Add-TreeItem -Name $database -Parent $childitem -Tag $nameSpace
        }

        $okbutton.Add_Click( {
                $window.Close()
                $script:okay = $true
            })

        $cancelbutton.Add_Click( {
                $script:selected = $null
                $window.Close()
            })

        $window.Add_SourceInitialized( {
                [System.Windows.RoutedEventHandler]$Event = {
                    if ($_.OriginalSource -is [System.Windows.Controls.TreeViewItem]) {
                        $script:selected = $_.OriginalSource.Tag
                    }
                }
                $treeview.AddHandler([System.Windows.Controls.TreeViewItem]::SelectedEvent, $Event)
            })

        $null = $window.ShowDialog()
    }

    end {
        if ($script:selected.length -gt 0 -and $script:okay -eq $true) {
            return $script:selected
        }

        Test-DbaDeprecation -DeprecatedOn "1.0.0" -EnableException:$false -Alias Show-SqlDatabaseList
    }
}