I try to get the visible text of the avalonedit control, but the VisualLines[] only handles wordwrap with TextLines[] and I dont know how to check if a TextLine is in the visible area or not.
The problem also would be solved if I can get the start- and endoffset (or length) of the visible text in the textview but I didnt find such a function or member...
Can anyone help me? Thx
You can use TextView.GetPosition to retrieve the document position for the corners of the text view:
TextViewPosition? start = textView.GetPosition(new Point(0, 0) + textView.ScrollOffset);
TextViewPosition? end = textView.GetPosition(new Point(textView.ActualWidth, textView.ActualHeight) + textView.ScrollOffset);
You can use TextDocument.GetOffset to convert a TextViewPosition into an offset. Note that you can get back null when there is no line at the specified point - within the visible area, that should occur only if the end of the visible area is behind the end of the document, so you should be able to assume the end of the document in those cases:
int startOffset = start != null ? document.GetOffset(start.Value) : document.TextLength;
int endOffset = end != null ? document.GetOffset(end.Value) : document.TextLength;
However, if you want to, you can also work directly with the VisualLine/TextLines: VisualLine.VisualTop tells you where a visual line starts (Y coordinate), and every TextLine within the VisualLine has a Height property. Using these, you can determine which text lines are visible, then use their GetCharacterHitFromDistance method to retrieve a visual column, and use VisualLine.GetRelativeOffset to calculate the text offset from the visual column. (this is what the TextView.GetPosition method is doing)