Avalonedit scrollchanged programmatically

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I'm using AvalonEdit to display a file with syntax highlighting and I would like to handle the ScrollChanged event. I can register for it in xaml like so:

XAML

<avalonedit:TextEditor ScrollViewer.ScrollChanged="TextEditor_ScrollChanged">

I would however like to create a subclass that handles this, so I don't have to do this in the Window's code each time, but I've been unable to figure out how to do it.

What I have tried:

The following attempts didn't work:

public class MySubClass : TextEditor
{
  public MySubClass()
  {
    // Cannot convert type 'MyProgram.MySubClass' to 'System.Windows.Controls.ScrollViewer'
    ((ScrollViewer)this).ScrollChanged += ScrollChanged;

    // Cannot convert type 'ICSharpCode.AvalonEdit.Editing.TextArea' to 'System.Windows.Controls.ScrollViewer'
    ((ScrollViewer)TextArea).ScrollChanged += ScrollChanged;
  }

I've also tried the suggestion to a similar question on stackoverflow: c# - How to handle `ScrollViewer.ScrollChanged` event in MVVM? - Stack Overflow[^], but UIHelper.FindChildren(this) doesn't find a ScrollViewer.

Posted 2-Jul-18 20:10pm

User 7429338

Updated 3-Jul-18 2:11am

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Richard Deeming · Accepted Answer · 2018-07-03T02:11:00

Solution 1

Add a routed event handler:

C#

public class MySubClass : TextEditor
{
    public MySubClass()
    {
        AddHandler(ScrollViewer.ScrollChangedEvent, new ScrollChangedEventHandler(ScrollChanged));
    }

Posted 3-Jul-18 2:11am

Richard Deeming

Updated 3-Jul-18 2:43am

v3

Comments

[no name] 3-Jul-18 8:33am

Thanks, this solution is perfect!
[Edit] Your edit is even more elegant. I had to change it a little to get it working though:

AddHandler(ScrollViewer.ScrollChangedEvent, new ScrollChangedEventHandler(ScrollChanged));

Richard Deeming 3-Jul-18 8:43am

Thanks - I've added that to the solution. :)