How To Track the Cursor Position?

Question

I have 2 InputFields and 2 Buttons. I would like that when the user clicks the Pi Button or -Pi Button, that value will be assigned to that InputField only where the cursor was (either the first input field or the second).

Button["Range", (DialogInput[{range1 = 0, range2 = 0}, 
Column[{"Enter the Range", 
 Panel[Column[{InputField[Dynamic[range1], Number], 
    InputField[Dynamic[range2], Number], 
    Button["-Pi", (range2 = -3.14159;)], 
    Button["Pi", (range1 = 3.14159;)]}]]}]]), Method -> "Queued"]

Answer 1

For your usage, you could simply use a PasteButton[] instead.

Button["Range", (DialogInput[{range1 = 0, range2 = 0}, 
Column[{"Enter the Range", 
 Panel[Column[{InputField[Dynamic[range1], Number], 
    InputField[Dynamic[range2], Number], 
    PasteButton["-Pi", -3.14159, Appearance -> Automatic], 
    PasteButton["Pi", 3.14159, Appearance -> Automatic]}]]}]]), 
Method -> "Queued"]