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446

answers:

3
+2  Q: 

Finding the position of the caret in a TextBox

I need to know the position of the caret in a TextBox so I can pop up a context menu near it. How do I find its placement (not character index)?

+1  A: 

Check out this example.

JP Alioto  2009-06-27 20:27:27
I want to pop up the context menu near the caret as the user types (kind of like intellisense), not simply replace the default context menu.
RandomEngy  2009-06-27 22:21:15
A: 

I think you will have to get the character index of the carat and then turn that into a pixel coordinate by calling TextRenderer.MeasureText() on the text to the left of the carat. This is obviously more complicated if your TextBox is multiline. Is it?

Fantius  2009-06-29 03:30:04
It's single line, fortunately. I'll give the measuring text thing a shot.
RandomEngy  2009-06-29 05:47:28
TextRenderer.MeasureText() appears to be for WinForms, not WPF. I found the equivalent for WPF, but I'm having difficulty grabbing the position of the TextBox I need to calculate the anchor point for the context menu.
RandomEngy  2009-06-29 21:21:42
Oh, WPF. Even though you used the WPF tag, you should probably also have that kind of information in the question.
Fantius  2009-06-30 15:22:19
+1  A: 

Found this article describing how to do what I need done. Turns out you can set both the PlacementTarget of the textbox and the PlacementRectangle from GetRectFromCharacterIndex and it will work.

RandomEngy  2009-06-29 21:45:46

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