Deleting text

[Azaral]

So, I'm trying to make a simple text field for user to type information, names etc. I can get the text input just find and display it just fine, however, what I haven't managed to do so far is to get the ability to backspace to work. Some help would be appreciated.

[Laurent]

What's your problem? Catching the backspace key is easy, deleting the last character of a string is easy too, so... ?

[Azaral]

Well, this is what I'm doing. It's been a while since I've fiddled with changing the stuff inside of strings.

Code: [Select]


if(systemEvents.Key.Code == sf::Key::Back)
{
text.erase(text.end());
}


I'm probably doing both things wrong for all I know.
This is after I've checked if it is a text entered event.

[Laurent]

text.end() points to one element past the last one. It doesn't refer to a valid character. Try erase(text.rbegin()), or erase(text.size() - 1) instead.

[Azaral]

Well, I tried text.end() -1 and no change. I thought maybe the display method was not correct so I had the text change position as the string got longer. I held the back key down and it indicated the string was just getting bigger instead of smaller

[FRex]

Checking keycode after identifying event as text entered = bad?
Text entered would have 8 as text which is backspace. KeyPressed would have back as keycode.

[Azaral]

OK I got it figured out.

Code: [Select]

if(systemEvents.Text.Unicode == 8 && text.end() != text.begin())
{
text.erase(text.end() -1);
}

else
{
text += systemEvents.Text.Unicode;
}


[Laurent]

'\b' would be better than 8

[Azaral]

Why's that?

[Laurent]

\b is the escape sequence that represents the backspace ASCII character.