; -----------------------------------------------------------------------------------------------------------------------------------
; This function updates a text field. It controls how many and which characters may be entered.
; It can also optionally force the text to change to display the minimum or maximum allowed value.
;
; If MaxLength is -1 then there is no maximum length allowed for the string in the textfield.
;
; AllowedChar$ is a string containing all characters allowed in the textfield.
; If AllowedChar$ is set to "" then the any character can be entered into the textfield.
;
; ForceValue is a boolean which determines if the function should override the text in the textfield and force it to be within
; the range of values specified, with the specified number of decimal places. You should probably only do this when the user
; hits enter in the textfield, or the textfield loses focus.
; -----------------------------------------------------------------------------------------------------------------------------------
Function UpdateTextField(TextField, MaxLength, AllowedChars$="", ForceValue=False, MinValue#=0, MaxValue#=0, DecimalPlaces=0)
Local Txt$
Local Value#
; Get the current text in the textfield.
Txt$ = TextFieldText$(TextField)
; Remove any characters from the textfield which the user is not allowed to enter.
Txt$ = Allowed$(Txt$, AllowedChars$)
; If the textfield should be forced into the desired range...
If ForceValue = True
; Get the current value of the textfield.
Value# = TextFieldText$(TextField)
; Make sure the value is within the allowed range for this textfield.
If Value# < MinValue# Then Value# = MinValue#
If Value# > MaxValue# Then Value# = MaxValue#
; Convert the value back into a string.
If DecimalPlaces = 0
Txt$ = Int(Value#)
Else
Txt$ = Value#
Txt$ = Left$(Txt$, Instr(Txt$, ".")+DecimalPlaces)
EndIf
EndIf
; Truncate the string to the maximum allowed length.
If (MaxLength > -1) Then Txt$ = Left$(Txt$, MaxLength)
; Update the textfield.
SetGadgetText TextField, Txt$
End Function
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