Colour selected text or anything typed after the caret

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C#

WPF

color

buttons

selection

, +

Hi guys,

I'm trying to get this little app to colour text that is selected when a button is pressed, or colour anything that comes after the caret when typing if nothing is selected.

This works, but I have a bug where, if I insert the caret between two characters and press a button, EVERYTHING is coloured. I do not want this, just everything that comes after the caret.

My assumption is that 'rtb.Selection.ApplyPropertyValue(TextElement.ForegroundProperty, colour);' is assuming everything on either side of it is 'selected'.

Can anyone assist, perhaps?

Thank you in advance.

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="300" Width="400">
    <Grid removed="Gray">
        <RichTextBox removed="Black" Foreground="White" Height="150" HorizontalAlignment="Right" Name="rtb" VerticalAlignment="Top" Width="354" Margin="0,12,12,0" />
        <Button Background="Blue" Content="Blue" Height="75" HorizontalAlignment="Left" Margin="139,174,0,0" Name="button2" VerticalAlignment="Top" Width="100" Click="btnColour_Click" Foreground="Yellow" />
        <Button Background="Red" Content="Red" Height="75" HorizontalAlignment="Left" Margin="12,174,0,0" Name="button1" VerticalAlignment="Top" Width="100" Click="btnColour_Click" Foreground="Blue" />
        <Button Background="Yellow" Content="Green" Height="75" HorizontalAlignment="Left" Margin="266,174,0,0" Name="button3" VerticalAlignment="Top" Width="100" Click="btnColour_Click" Foreground="Red" />
    </Grid>
</Window>

private void colourText(Brush colour)
{

    TextPointer startPointer = rtb.Document.ContentStart.GetNextInsertionPosition(LogicalDirection.Forward);
    TextPointer endPointer = rtb.Document.ContentEnd.GetNextInsertionPosition(LogicalDirection.Backward);
    TextRange range = new TextRange(startPointer, endPointer);
    int length = range.Text.Length;

    rtb.Selection.ApplyPropertyValue(TextElement.ForegroundProperty, colour);

    if (length == 0)
    {
        rtb.Foreground = colour;
    }
}

private void btnColour_Click(object sender, RoutedEventArgs e)
{
    Button btn = sender as Button;
    Brush colour = btn.Background;

    colourText(colour);
    rtb.Focus();
}