Any way to limit the input format for string control?

[dragondriver]

Hi there,

  I need a control for the user to input some string with only alphabets and no special characters. Also need to control the number of characters to input. I search it and see someone use Xcontrol to achieve that but I really have no idea how to get that. Any other way to get this function works on string input?

[altenbach]

Set the string to "single line" and "update while typing". Use a filtering key-down event and discardunwanted characters of characters past the max length.

(Make sure not to filter edit keys, such as backspace, etc.)

(look at my very old example for ideas.)

[dragondriver]

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@altenbach wrote:

Set the string to "single line" and "update while typing". Use a filtering key-down event and discardunwanted characters of characters past the max length.

(Make sure not to filter edit keys, such as backspace, etc.)

(look at my very old example for ideas.)

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Thanks a lot. But that's works on in run time not in edit mode, right?

[altenbach]

You did not specify edit mode functionality. If you need that, you need to build an x-control.

[dragondriver]

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@altenbach wrote:

You did not specify edit mode functionality. If you need that, you need to build an x-control.

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my bad. It seems that x-control is the only way to achieve that. I don't know how to program x-control, I found two examples online but it seems that we need to create the appearance ourselve. Is it possible to inherit the control for built-in string or slive string and modify the behavior to get that. I want to keep all controls the same appearance.

[altenbach]

You have full control over the appearance of the x-control. I don't understand your concern.