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What is the best way to show error description tooltips for syntax errors in AvalonEdit?

I am highlighting the errors with custom DocumentColorizingTransformer. What I want to accomplish is to show the error description when user hovers the corresponding VisualLineElement.

Thanks in advance.

The old ICSharpCode.TextEditor has a ToolTipRequested event; and I think I'll implement something similar in AvalonEdit.

Until then, you'll have to implement it yourself - set timer in MouseMove, if timer elapses without further mouse movement, perform a hit test on the document (this is currently a bit messy - see TextView.GetVisualLineElementFromPosition) and show your tool tip.

Hi Daniel,

Did you have a chance to implement ToolTip support?

There's no built-in tooltip support, but long ago I've added the TextEditor.MouseHover event which can be used to show tool tips.

Example code:

        ToolTip toolTip = new ToolTip();
        
        void TextEditorMouseHover(object sender, MouseEventArgs e)
        {
            var pos = textEditor.GetPositionFromPoint(e.GetPosition(textEditor));
            if (pos != null) {
                toolTip.PlacementTarget = this; // required for property inheritance
                toolTip.Content = pos.ToString();
                toolTip.IsOpen = true;
                e.Handled = true;
            }
        }
        
        void TextEditorMouseHoverStopped(object sender, MouseEventArgs e)
        {
            toolTip.IsOpen = false;
        }