A container and lineEdit that accept both strings and doubles

[tomy]

Hi,

I found the source of the problem. I need some container that can at least do what a stringstream does in C++. We temporarily call it a "somecontainer"
In C++ using a stringstream we can do these:

stringstream ss;
ss << "ABC";
cout << ss.str();    // here it shows its value (ABC) in standard screen
double d =12;
ss << d;
cout << ss.str();    // here it shows its value (ABC12) in standard screen
ss.clear();  // This way it will be cleaned
cout << ss.str();    // here it shows nothing

Do we have such a "somecontainer" in Qt?

I also need a lineEdit that can accept "somecontainer" that is, both strings and doubles, like this:

QLineEdit* l = new QLineEdit;
l -> setText(somecontainer);  // It should shows a string when somecontainer contains a string
l -> setNumber(somecontainer);  // It should shows a number when somecontainer contains a number

Can we do it over a lineEdit?

[SGaist]

Hi,

Isn't that a QTextStream + QString combo without the need to subclass QLineEdit ?

[tomy]

@SGaist
Do you mean that I use QTextStream for inputting integers (doubles) and QString for strings and lineEdit will be able to show both of them?

I didn't understand "without need to subclass lineEdit" part. I'm not a native speaker of English but my grammar is not bad. (subclass is a noun).

   QString s = "12";
   s += "AB";
   lineEdit1 -> setText(s);  // Untill here OK. LineEdit1 will show the contents of s well.
   QTextStream ss;
   ss 40;  // How to put that 40 into *ss*?
   lineEdit2 -> setText(ss);  // Will it be possible?

I thank you for the helps.

[VRonin]

see QString::number()

 QString s = "12";
   s += "AB";
lineEdit1 -> setText(s);
s+= QString::number(40);
lineEdit2 -> setText(s);

Important to note that QString::number() does not use localised conventions (e.g. Anglosaxon decimal separator is . while "latin" decimal separator is ,, QString::number() will always use .). if you want a more user friendly result use locale()->toString()

 QString s = "12";
   s += "AB";
lineEdit1 -> setText(s);
s+= lineEdit2->locale()->toString(40);
lineEdit2 -> setText(s);

[SGaist]

About subclasses and inheritance.

QString string;
QTextStream stream(&string);
stream << "AB" << "12";

lineEdit1->setText(string);

stream << 40.9;

lineEdit2->setString(string);

[tomy]

@SGaist
Thank you.

[SGaist]

You're welcome !

If all these answer your question, then please mark the thread as solved using the "Topic Tools" button so that other forum users may know a solution has been found :)

[tomy]

@SGaist
Ow, sure!
Thanks kind man.