WPF textbox in "virtual" mode

Question

Is it possible to use TextBox in "virtual" mode.

I want to supply text on demand, when user scrolls through the document.

Answer 1

To use the built in virtualization (i.e. VirtualizingStackPanel used by default ListBox) you need to be able to chunk the content into items which can be progressively loaded one at a time as needed (logical scrolling). To do this for arbitrary large text would involve a lot of pre-processing to calculate line wrapping and break the text up into lines or groups of lines. Once you do that you would need to use a container derived from ItemsControl instead of a single TextBox. Do you have a requirement to have editable text?