U++ forum: Welcome to the forum

Re: Extending EditString to filter keys [message #31170 is a reply to message #31168]

Fri, 11 February 2011 14:08

dolik.rce
Messages: 1791
Registered: August 2008
Location: Czech Republic

Ultimate Contributor

Hi Jeremi,

There is a litle bit simpler way. All the U++ edit fields based on EditField have a method SetConvert(const Convert&), which allows to handle how seting and retrieving values work and, most importantly for you, it allows to filter which characters are alowed.

All you need to do is to create a class inherited from Convert and override its Filter method. The code could be something simple such as:

class MyConvert:public Convert{
public:
    virtual int Filter(int chr){
        return IsAlpha(chr)?chr:0; //return 0 if we want to discard the character
    }
};

Then you can use it as myeditstring.SetConvert(MyConvert()) and it will filter out all characters except letters. For full description of Convert have a look in manual. Nice examples can be found Core/Convert.{h,cpp}.

Best regards,
Honza

PS: I wrote it from top of my head, hopefully there are no big mistakes... Smile

Report message to a moderator