Main/Set-ConsoleTransparency.ps1

<#
.SYNOPSIS
    Sets console transparency
 
.DESCRIPTION
    Adjust the console transparency to a given level
 
.EXAMPLE
PS> Set-ConsoleTransparency
Sets console transparency to default level of 220
 
.EXAMPLE
PS> Set-ConsoleTransparency -Off
Disables console transparency
 
.EXAMPLE
PS> Set-ConsoleTransparency -Level 200
Sets console transparency to the given level
 
.EXAMPLE
PS> Set-ConsoleTransparency -Persist
Sets console transparency to the predefined level and persist its value for other sessions
 
.EXAMPLE
 
#>


function Set-ConsoleTransparency {
    [CmdletBinding(DefaultParameterSetName = "Level")]
    param(
        [Parameter(ParameterSetName = "Level")]
        [ValidateRange(0, 255)]
        # Set transparency level
        [int] $Level = 220,

        [Parameter(ParameterSetName = "Off")]
        # Disables transparency
        [switch] $Off = $false,

        [Parameter(ParameterSetName = "Level")]
        [Parameter(ParameterSetName = "Off")]
        # Whether to apply this change for future sessions or not
        [switch] $Persist = $false
        )

    if ($Off) {
        $Level = 255
        if ($Persist) {
            Remove-Item $Script:localSetConsoleTransparencyConfig
        }
    }

    if ($Persist -and -not $Off) {
        $config = [PSCustomObject] @{ Level = $Level }
        $config | ConvertTo-Json -Compress | Out-File $Script:localSetConsoleTransparencyConfig
    }

    $hwnd = (Get-Process -Id $PID).MainWindowHandle
    if ([xUtilityTransparency.Win32Methods]::transparencyLevel -ne 0) {
        [xUtilityTransparency.Win32Methods]::SetWindowTransparent($hwnd, 255)
    }
    
    [xUtilityTransparency.Win32Methods]::SetWindowTransparent($hwnd, $level)
}

Add-Type -Type @"
using System;
using System.Runtime.InteropServices;
using System.Text;
namespace xUtilityTransparency
{
    public static class Win32Methods
    {
        internal const int GWL_EXSTYLE = -20;
        internal const int WS_EX_LAYERED = 0x80000;
        internal const int LWA_ALPHA = 0x2;
        internal const int LWA_COLORKEY = 0x1;
        public static int transparencyLevel = 0;
        [DllImport("user32.dll")]
        internal static extern bool SetLayeredWindowAttributes(IntPtr hwnd, uint crKey, byte bAlpha, uint dwFlags);
        [DllImport("user32.dll")]
        internal static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);
        [DllImport("user32.dll")]
        internal static extern int GetWindowLong(IntPtr hWnd, int nIndex);
        public static void SetWindowTransparent(IntPtr hWnd, byte level)
        {
            SetWindowLong(hWnd, GWL_EXSTYLE, GetWindowLong(hWnd, GWL_EXSTYLE) ^ WS_EX_LAYERED);
            SetLayeredWindowAttributes(hWnd, 0, level, LWA_ALPHA);
            transparencyLevel = level;
        }
    }
}
"@


# Initialization code
$Script:localSetConsoleTransparencyPath = Join-Path -Path $Script:moduleWorkPath -ChildPath "Set-ConsoleTransparency"

if (-not (Test-Path $Script:localSetConsoleTransparencyPath)) {
    New-Item -ItemType 'Directory' -Path $Script:localSetConsoleTransparencyPath | Write-Verbose
}

$Script:localSetConsoleTransparencyConfig = Join-Path -Path $Script:localSetConsoleTransparencyPath -ChildPath "config.json"
if ((Test-Path $Script:localSetConsoleTransparencyConfig)) {
    $transparencyConfig = (Get-Content $Script:localSetConsoleTransparencyConfig) | Out-String | ConvertFrom-Json

    $hwnd = (Get-Process -Id $PID).MainWindowHandle
    [xUtilityTransparency.Win32Methods]::SetWindowTransparent($hwnd, $transparencyConfig.Level)
}