ExampleGUI

Add-Type -AssemblyName PresentationFramework
Add-Type -AssemblyName System.Windows.Forms
Add-Type -AssemblyName WindowsBase
Add-Type -AssemblyName PresentationCore

# Build the XAML hashtable for everything
$uiHash = [hashtable]::Synchronized(@{})

#region The XAML Code
[xml]$xaml = @'
<Window x:Class="ExampleGUI"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:ExampleGUI"
        DataContext="{Binding RelativeSource={RelativeSource Self}}"
        mc:Ignorable="d"
        Title="Example GUI" Height="450" Width="800">
    <Window.Background>
        <LinearGradientBrush StartPoint='0,0' EndPoint='0,1'>
            <LinearGradientBrush.GradientStops>
                <GradientStop Color='#C4CBD8' Offset='0' />
                <GradientStop Color='#E6EAF5' Offset='0.2' />
                <GradientStop Color='#CFD7E2' Offset='0.9' />
                <GradientStop Color='#C4CBD8' Offset='1' />
            </LinearGradientBrush.GradientStops>
        </LinearGradientBrush>
    </Window.Background>
   <Window.Resources>
        <!--Control colors.-->
        <Color x:Key="ControlNormalColor">#000000</Color>
        <Color x:Key="ControlMouseOverColor">#5E5E5E</Color>
        <Color x:Key="DisabledControlColor">#FFF2F2F2</Color>
        <Color x:Key="DisabledForegroundColor">#909098</Color>
        <Color x:Key="ControlPressedColor">#878787</Color>

        <Style x:Key="ButtonFocusVisual">
            <Setter Property="Control.Template">
                <Setter.Value>
                    <ControlTemplate>
                        <Border>
                            <Rectangle Margin="2" StrokeThickness="1" Stroke="#60000000" StrokeDashArray="1 2" />
                        </Border>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

        <!-- Button -->
        <Style TargetType="Button">
            <Setter Property="SnapsToDevicePixels" Value="true" />
            <Setter Property="OverridesDefaultStyle" Value="False" />
            <Setter Property="FocusVisualStyle" Value="{StaticResource ButtonFocusVisual}" />
            <!--<Setter Property="MinHeight" Value="29px" />
            <Setter Property="MinWidth"  Value="103px" />-->
            <Setter Property="Foreground" Value="#FFFFFFFF" />
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="Button">
                        <Border TextBlock.Foreground="{TemplateBinding Foreground}" x:Name="Border">
                            <Border.Background>
                                <SolidColorBrush  Color="{DynamicResource ControlNormalColor}" />
                            </Border.Background>
                            <VisualStateManager.VisualStateGroups>
                                <VisualStateGroup x:Name="CommonStates">
                                    <VisualStateGroup.Transitions>
                                        <VisualTransition GeneratedDuration="0:0:0.5" />
                                        <VisualTransition GeneratedDuration="0" To="Pressed" />
                                    </VisualStateGroup.Transitions>
                                    <VisualState x:Name="Normal" />
                                    <VisualState x:Name="MouseOver">
                                        <Storyboard>
                                            <ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Panel.Background).(SolidColorBrush.Color)"
                                                Storyboard.TargetName="Border">
                                                <EasingColorKeyFrame KeyTime="0" Value="{StaticResource ControlMouseOverColor}" />
                                            </ColorAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="Pressed">
                                        <Storyboard>
                                            <ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Panel.Background).(SolidColorBrush.Color)"
                                                Storyboard.TargetName="Border">
                                                <EasingColorKeyFrame KeyTime="0" Value="{StaticResource ControlPressedColor}" />
                                            </ColorAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="Disabled">
                                        <Storyboard>
                                            <ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(Panel.Background).(SolidColorBrush.Color)"
                                                Storyboard.TargetName="Border">
                                                <EasingColorKeyFrame KeyTime="0" Value="{StaticResource DisabledControlColor}" />
                                            </ColorAnimationUsingKeyFrames>
                                            <ColorAnimationUsingKeyFrames Storyboard.TargetProperty="(TextBlock.Foreground).(SolidColorBrush.Color)"
                                                Storyboard.TargetName="Border">
                                                <EasingColorKeyFrame KeyTime="0" Value="{StaticResource DisabledForegroundColor}" />
                                            </ColorAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>
                                </VisualStateGroup>
                            </VisualStateManager.VisualStateGroups>
                            <ContentPresenter Margin="2"
                            HorizontalAlignment="Center"
                            VerticalAlignment="Center"
                            RecognizesAccessKey="True" />
                        </Border>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </Window.Resources>
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="100" />
            <ColumnDefinition />
        </Grid.ColumnDefinitions>
        <TextBox x:Name="CodeBlock" Grid.Column="1"
                 VerticalAlignment="Top" HorizontalAlignment="Left"
                 TextWrapping="NoWrap" VerticalScrollBarVisibility="Visible" HorizontalScrollBarVisibility="Visible"/>
        <Button Content="Reset" HorizontalAlignment="Left" VerticalAlignment="Top" Width="100"
                x:Name="ResetBtn" Height="40" IsEnabled="False"/>

    </Grid>
</Window>
'@ -replace 'mc:Ignorable="d"','' -replace "x:N",'N'  -replace '^<Win.*', '<Window'
$reader = New-Object System.Xml.XmlNodeReader -ArgumentList $xaml
$uiHash.Window = [System.Windows.Markup.XamlReader]::Load($reader)

$xaml.SelectNodes("//*[@Name]") | ?{$_.Name -notlike "*lbl" -and $_.Name -ne "label" -and $_.Name -notlike "*Color*"} | %{
    $uiHash.Add($_.Name,$uiHash.Window.FindName($_.Name))
}
#endregion

$uiHash.NotSet = $true

# Event for clicking the Reset Button
$uiHash.ResetBtn.Add_Click({
    $uiHash.NotSet = $true
    $uiHash.CodeBlock.Text = [string]::Empty
    $uiHash.ResetBtn.IsEnabled = $false
})

# Event for when the mouse enters the text box
$uiHash.CodeBlock.Add_MouseEnter({
    if ($uiHash.NotSet)
    {
        # Reads the Clipboard only if it's a file that's copied.
        $file = Get-Clipboard -Format FileDropList -ErrorAction SilentlyContinue
        if ($null -ne $file)
        {
            # If it's a file, then we try to the read the text contents
            $text = Get-Content -Path $file.FullName -Raw -ErrorAction SilentlyContinue
            if (-not [string]::IsNullOrEmpty($text))
            {
                # If there's content read, then we populate the textbox with it.
                $uiHash.CodeBlock.Text = $text
                $uiHash.NotSet = $false
                $uiHash.ResetBtn.IsEnabled = $true  # Enable the Reset Button so the user do this again.
            }
        }
    }
})

$uiHash.Window.ShowDialog() > $null