Coded keys generate square characters during text input and saveString

Programming Questions

beth45

Coded keys generate square characters during text input and saveString

in Programming Questions • 1 years ago

In my applet, when users type using a coded key (for instance, if they press on the SHIFT key to write a capital letter or if they type on BACKSPACE to erase a character, there is a square character that is typed.

Does anyone know how this can be fixed?

To see what I mean, try typing a capital letter or backspacing in this applet:

http://www.learningprocessing.com/examples/chapter-18/example-18-1/

Replies(3)

jbum

Re: Coded keys generate square characters during text input and saveString

1 years ago

Yes, check to see if key == CODED, and then ignore it, like so.

Copy code

void keyPressed() {
// If the return key is pressed, save the String and clear it
if (key == '\n' ) {
saved = typing;
// A String can be cleared by setting it equal to ""
typing = "";
} else if (key == CODED) {
// ignore it.
} else {
// Otherwise, concatenate the String
// Each character typed by the user is added to the end of the String variable.
typing = typing + key;
}
}

beth45

Re: Re: Coded keys generate square characters during text input and saveString

1 years ago

Thanks jbum.

It works for most keys but not for the backspace key which is odd. The backspace key does not backspace and still generates a square character. This is my code (I added your keycode test):

void keyPressed() {
    fullComment = splitTokens(captureText, ", ");
    if (key == CODED) {
     // ignore it.
   }
   else {
    userInputText = userInputText + key; // add each character typed by the user to the end of the userInputText String variable.
    // If the return key is pressed, save the String and clear it
    if (key == RETURN || key == ENTER) {
      captureText = userInputText;
      appendStrings("userinput.txt", fullComment);
      userInputText = ""; // Clear the String by setting it equal to ""
    }
   }
}
} // end of TextField class

beth45

Re: Re: Coded keys generate square characters during text input and saveString

1 years ago

Actually, I just discovered this hidden message at the bottom of that page (ie. http://www.learningprocessing.com/examples/chapter-18/example-18-1/#comments ) which gives, in a few lines of code, a beautiful solution that works like magic. It is signed Mr. Winkle.

For those wondering about deleting mistyped letters instead of

typing = typing + key;

use this:

if (keyCode == BACKSPACE) {
typing = typing.substring(0, typing.length() - 1);
}
else
if (key != CODED) typing += key;

greets, mr.winkle

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