WPF and Powershell: Mirroring/Syncing text boxes - wpf

Question

I have two text boxes. I would like to mirror the first text box to the second text box, but if you manually update the second box after the text has been mirrored, it should stay as that regardless of if you update the first text box again.
<TextBox x:Name="TextBoxUserLogonNameUPN" HorizontalAlignment="Left" Height="23" Margin="10,41,0,0" TextWrapping="Wrap" Text="" VerticalAlignment="Top" Width="300"/>
<TextBox x:Name="TextBoxUserLogonNameSamAccountName" HorizontalAlignment="Left" Height="23" Margin="326,100,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="310" Text="{Binding Path=Text, ElementName=TextBoxUserLogonNameUPN, Mode=OneWay, UpdateSourceTrigger=PropertyChanged}"/>
I have tried the above but with Mode=OneWay in the Binding. If I update the first text box a second time, after manually updating the second, it wipes what was in the second and mirrors again.
I am using WPF with PowerShell. I am happy to manage this by the Powershell if it can't be done in Xaml.

Answer 1

Assuming that textbox1 losing focus is the event that should copy textbox1 text to textbox2, this code should work for you. All the action is in the function textBox1_LostFocus. The first time through, simply set the textbox2Tagproperty to a value that you test for second and subsequent times through
Note: The form has two labels and two text boxes
WpfWindow1.xaml.ps1 is the entry point for this program
WpfWindow1.xaml.ps1
function Add-ControlVariables {
New-Variable -Name 'textBox1' -Value $window.FindName('textBox1') -Scope 1 -Force
New-Variable -Name 'textBox2' -Value $window.FindName('textBox2') -Scope 1 -Force
}
function Load-Xaml {
[xml]$xaml = Get-Content -Path $PSScriptRoot\WpfWindow1.xaml
$manager = New-Object System.Xml.XmlNamespaceManager -ArgumentList $xaml.NameTable
$manager.AddNamespace("x", "http://schemas.microsoft.com/winfx/2006/xaml");
$xaml.SelectNodes("//*[#x:Name='textBox1']", $manager)[0].RemoveAttribute('TextChanged')
$xaml.SelectNodes("//*[#x:Name='textBox2']", $manager)[0].RemoveAttribute('TextChanged')
$xaml.SelectNodes("//*[#x:Name='textBox1']", $manager)[0].RemoveAttribute('LostFocus')
$xamlReader = New-Object System.Xml.XmlNodeReader $xaml
[Windows.Markup.XamlReader]::Load($xamlReader)
}
function Set-EventHandlers {
$textBox1.add_TextChanged({
param([System.Object]$sender,[System.Windows.Controls.TextChangedEventArgs]$e)
textBox1_TextChanged($sender,$e)
})
$textBox2.add_TextChanged({
param([System.Object]$sender,[System.Windows.Controls.TextChangedEventArgs]$e)
textBox2_TextChanged($sender,$e)
})
$textBox1.add_LostFocus({
param([System.Object]$sender,[System.Windows.RoutedEventArgs]$e)
textBox1_LostFocus($sender,$e)
})
}
$window = Load-Xaml
Add-ControlVariables
Set-EventHandlers
function textBox1_TextChanged
{
param($sender, $e)
#do stuff you want to do when textBox1.Text changes
}
function textBox2_TextChanged
{
param($sender, $e)
#do stuff you want to do when textBox2.Text changes
}
function textBox1_LostFocus
{
param($sender, $e)
if ($textBox2.Tag -ne "mirrored")
{
#turn off textBox2 TextChanged event so that code in textBox2_TextChanged is not executed
$textBox2.remove_TextChanged({
param([System.Object]$sender,[System.Windows.Controls.TextChangedEventArgs]$e)
textBox2_TextChanged($sender,$e)
})
$textBox2.Text = $sender.Text
$textBox2.Tag = "mirrored"
#turn textBox2 TextChanged event back on
$textBox2.add_TextChanged({
param([System.Object]$sender,[System.Windows.Controls.TextChangedEventArgs]$e)
textBox2_TextChanged($sender,$e)
})
}
}
$window.ShowDialog()
WpfWindow1.xaml
<Window
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Grid>
<TextBox x:Name="textBox1" HorizontalAlignment="Left" Height="29" Margin="79,45,0,0" TextWrapping="Wrap" Text="" VerticalAlignment="Top" Width="132" TextChanged="textBox1_TextChanged" LostFocus="textBox1_LostFocus"/>
<TextBox x:Name="textBox2" HorizontalAlignment="Left" Height="29" Margin="298,45,0,0" TextWrapping="Wrap" Text="" VerticalAlignment="Top" Width="105" TextChanged="textBox2_TextChanged"/>
<Label Content="Text1:" HorizontalAlignment="Left" Height="25" Margin="32,45,0,0" VerticalAlignment="Top" Width="63"/>
<Label Content="Text2:" HorizontalAlignment="Left" Height="25" Margin="242,45,0,0" VerticalAlignment="Top" Width="56"/>
</Grid>
</Window>