Create timer function that does not use start-sleep

Question

Hey all I would like to create a timer function that does not use the start-sleep command because this freezes my GUI. I've wrote the start of a function but it seems to move on before the specified time has finished.
Here's what I have:
$Global:timerCounter=0
$Global:timer = new-object System.Windows.Threading.DispatcherTimer
Function Timer{
param(
[parameter(Mandatory=$true)]
[int]$time
$timer.Interval = [TimeSpan]"0:0:$($time)"
$timer.Add_Tick({
$Global:timerCounter++
if($Global:timerCounter -ge 1) {
$Global:timer.Stop()
$timer.Start()
Then in my script i would like to call Timer -time #of seconds. It seems that when I call it the add_tick is registered and then started but it continues on with the rest of my script. Is there a better way of doing this without using start-sleep?
Thanks!

Answer 1

Okay the issue I'm having is that I have code after the $timer.start that I don't wan't to run till a powershell job is done. In all the examples I've seen it has to come to the end of the code then it starts the tick. So in your example it comes to the
end of of your code and showsDialog() then starts ticking.
So:
add-type -AssemblyName system.windows.forms
$form=New-Object System.Windows.Forms.Form
$btn=New-Object System.Windows.Forms.Button
$form.Controls.Add($btn)
$btn.add_Click({$form.Close()})
$btn.Dock='Fill'
$btn.Font='Lucida Console, 20.25pt, style=Bold'
$btn.Text=[DateTime]::Now
$timer=New-Object System.Windows.Forms.Timer
$timer.Interval=1000
$timer.add_Tick({$btn.Text=[DateTime]::Now})
$timer.Start()
$form.ShowDialog()
#I want to do other things here but only after the ps job has finished
Thanks I really am trying to figure this out. 
Here is the code I'm working with I guess I'm unclear on how to order the timer and the rest of my code:
if($syncHash.mainCopy){
$syncHash.mainJobDone = $false
$syncHash.writeHost = $false
while(-not $syncHash.mainJobDone){
[System.Windows.Forms.Application]::DoEvents()
if($syncHash.writeHost -eq $false){
Write-OutputBox -Message "Copying"
$syncHash.writeHost = $true
$syncHash.inProgress = $syncHash.mainCopy | Where-Object {$_.State -match 'running'}
$syncHash.currentCopyTime++
}elseif($syncHash.currentCopyTime -ge ($syncHash.averageCopyTime * 2) -and $syncHash.collectionCopyTime.Count -ne 0){
$syncHash.Unusable += $syncHash.currentMainCopyMachine
$syncHash.computersNotForInstall += $syncHash.currentMainCopyMachine
$syncHash.inProgress = $null
$syncHash.mainCopyTimedOut = $True
Write-OutputBox -Type WARNING: -Message "$($syncHash.currentMainCopyMachine) is taking too long. Removing Job.."
Add-Content -Path $log_path -Value "$($syncHash.currentMainCopyMachine) taking to long to copy to"
Stop-Job $syncHash.mainCopy
}else{
$syncHash.inProgress = $syncHash.mainCopy | Where-Object {$_.State -match 'running'}
Write-OutputBox -Message "." -NoNewLine
############################# ############# So I need it to wait right here I have other code other than in this block ############# that needs to run $syncHash.currentCopyTime++
if(-not $syncHash.inProgress){
$syncHash.mainJobDone = $true