Countdown in a PowerShell GUI

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The following script allows to include a countdown in a PowerShell-based GUI.

Basically, a “timer” object is used to decrement a variable.

In this example:

  • The countdown is initialized to 10
  • Then, a timer is used to run a function every second
  • This function decrement the countdown
  • When the value of the countdown equal 0, another function is called to launch the action

.

.

##*=============================================================================================================================================
##* DEFINITIONS
##*=============================================================================================================================================

# Interface Definition
[void][System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms")
[void][System.Reflection.Assembly]::LoadWithPartialName("System.Drawing")

# Hide PowerShell Console
Add-Type -Name Window -Namespace Console -MemberDefinition '
[DllImport("Kernel32.dll")]
public static extern IntPtr GetConsoleWindow();
[DllImport("user32.dll")]
public static extern bool ShowWindow(IntPtr hWnd, Int32 nCmdShow);
'
$consolePtr = [Console.Window]::GetConsoleWindow()
[Console.Window]::ShowWindow($consolePtr, 0)


##*=============================================================================================================================================
##* MAIN FORM
##*=============================================================================================================================================

# Main Form Definition
$MainForm = New-Object System.Windows.Forms.Form
$MainForm.ClientSize = New-Object System.Drawing.Size(200, 100)
$MainForm.MaximumSize = New-Object System.Drawing.Size(200, 100)
$MainForm.MinimumSize = New-Object System.Drawing.Size(200, 100)
$MainForm.MaximizeBox = $false
$MainForm.MinimizeBox = $false
$MainForm.StartPosition = "CenterScreen"
$MainForm.Text = "The Final Countdown"


##*=============================================================================================================================================
##* DISPLAY COUNTDOWN
##*=============================================================================================================================================

# TimeRemaining Label
$TimeRemaining_Label = New-Object System.Windows.Forms.Label
$TimeRemaining_Label.BorderStyle = [System.Windows.Forms.BorderStyle]::None
$TimeRemaining_Label.Location = New-Object System.Drawing.Point(10, 10)
$TimeRemaining_Label.Size = New-Object System.Drawing.Size(120, 80)
$TimeRemaining_Label.Font = "Segoe UI,10"
$TimeRemaining_Label.ForeColor = "#000000"
$TimeRemaining_Label.Text = "Time remaining :"

# Countdown
$Countdown_Label = New-Object System.Windows.Forms.Label
$Countdown_Label.BorderStyle = [System.Windows.Forms.BorderStyle]::None
$Countdown_Label.Location = New-Object System.Drawing.Point(130, 10)
$Countdown_Label.Size = New-Object System.Drawing.Size(25, 80)
$Countdown_Label.Font = "Segoe UI,10"
$Countdown_Label.ForeColor = "#FF0000"

# Countdown starts at 10 secondes
$Countdown_Label.Text = "10"

# Countdown is decremented every seconde using a timer
$timer=New-Object System.Windows.Forms.Timer
$timer.Interval=1000
$timer.add_Tick({CountDown})
$timer.Start()

# Assign Button and Countdown to Page
$MainForm.Controls.Add($TimeRemaining_Label)
$MainForm.Controls.Add($Countdown_Label)


##*=============================================================================================================================================
##* FUNCTIONS
##*=============================================================================================================================================

Function Main {
	[System.Windows.Forms.Application]::EnableVisualStyles()
	[System.Windows.Forms.Application]::Run($MainForm)
}

Function CountDown {
    $Countdown_Label.Text -= 1
	If ($Countdown_Label.Text -eq 0) {
        $timer.Stop()
        Action_After_End
	}
}

Function Action_After_End {
	[System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms")
    [System.Windows.Forms.MessageBox]::Show("Countdown ended" , "Info")
    $MainForm.close()
}


##*=============================================================================================================================================
##* CALL MAIN FUNCTION
##*=============================================================================================================================================

Main