FlowDocument GetCharRect returning infinity for top, bottom, left right - How get rectangle for offset position from document

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FlowDocument GetCharRect returning infinity for top, bottom, left right - How get rectangle for offset position from document

joe blow 1

Sometimes GetCharRect return a negative or positive infinity for the top,right bottom and left positions.
Is there a way to get the rectangle for a character at offest position from the start of the document without the CarorPosition having to point it or the offset position being selected?

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Answer 1

joe blow 1

No matter what the offset value is top,right bottom and left positions
richTextBox.CaretPosition.GetPositionAtOffset(163).GetCharacterRect(LogicalDirection.Forward) {Empty} System.Windows.Rect

The Selection is an empty string.

	richTextBox.Selection	{System.Windows.Documents.TextSelection}	System.Windows.Documents.TextSelection  
	Text	""	string

Viorel 127K Reputation points

2022-07-18T02:10:18.463+00:00

Try something like this: richTextBox.CaretPosition.GetPositionAtOffset(163).GetInsertionPosition( LogicalDirection.Forward).GetCharacterRect(LogicalDirection.Forward). Note that the width is probably always empty.
joe blow 1 Reputation point

2022-07-18T16:56:00.573+00:00

Hey thank
I found that the SelectionChanged event handle is called in between the preview keymouse down an up event.
If I waited to do what I need to do after the preview key up event everything worked fine

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FlowDocument GetCharRect returning infinity for top, bottom, left right - How get rectangle for offset position from document

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