QLineEdit set min max range?

[jpn]

You can use the subclassed line edit widget by promoting it as custom widget in the designer. See the context menu of the line edit.

[whitefurrows]

Hi,

thank you that's work, but i have one more problem MyLineEdit keep focus if intermediate but if i press button "Save" can i save the data(that's wrong) and MyLineEdit keep focus.

Is that OK? What can i do?

Greetings,

Whitefurrows

[jpn]

Sorry, what's the problem? You'll have to explain a bit more clearly. "Can I save the data" is quite an abstract concept..

[whitefurrows]

Sorry, ok i try it. I have many QLineEdit's on a QWidget and a Button. When the user push the butten, then store the programm the values from the QlineEdit's to the database. The user can store the data always, but that is wrong. I wont the user can save the data only if all QlineEdit's contain right values?

You know what i mean?

[jpn]

You could check the validator states whenever QLineEdit::textChanged() signal is emitted. Or you could emit signals (sending state as a parameter) from the validators whenever they are asked to validate. There are many possibilities... But anyway, you have to somehow keep track of the validator states and enable/disable the button when appropriate.

Edit: just a side note.. have you looked the possibility of using for example QSqlTableModel + QTableView and a custom delegate to provide suitable editor..?

[whitefurrows]

Hi,

thank you. I know how can i check the validator states whenever QLineEdit::textChanged() signal is emitted and enable/disable the button.

I have one last question, i think it's better the QLineEdit can't lost focus as long as the validator states = Intermediate and the user can do nothing else.

You kow how can i do that?

Thanks in advance,

Whitefurrows

[jpn]

It's not possible to prevent user from pressing the button by forcing the focus to a line edit. If you ever have to prevent user from doing something, disabling widgets (or blocking with a modal dialog) is the way to go in most cases.

I get the feeling that there is some misunderstanding of the concept "focus" here. A widget having focus just receives all keyboard input events (unless some other widget has grabbed the keyboard, but that's a whole different story). You can still eg. mouse click over any other widget and so on..

[whitefurrows]

Hi,

sorry the late answer, but i have a long time read the doc and written code. I thing the right way is disabling widgets.

I do this to check QValidator::State:

int pos = 0; 
   QValidator::State state; 
   QList<QLineEdit *> leList= this->findChildren<QLineEdit *>(); 
   for (int i=0;i<leList.size();i++){ 
      state = leList[i]->validator()->validate(leList[i]->text(), pos); 
      if(state == QValidator::Intermediate && leList[i]->text() != ""){ 
         //disabling widgets
      } 
   }

int pos = 0; 
   QValidator::State state; 
   QList<QLineEdit *> leList= this->findChildren<QLineEdit *>(); 
   for (int i=0;i<leList.size();i++){ 
      state = leList[i]->validator()->validate(leList[i]->text(), pos); 
      if(state == QValidator::Intermediate && leList[i]->text() != ""){ 
         //disabling widgets
      } 
   }

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That's worke fine, but i get a error if a QLineEdit without QValidator.

How can i check if QLineEdit Validator set, or you know a other solution?

Greetings,

Whitefurrows

[jacek]

How can i check if QLineEdit Validator set, or you know a other solution?

const QValidator * QLineEdit::validator () const
Returns a pointer to the current input validator, or 0 if no validator has been set.

So this should work:

...
QList<QLineEdit *> leList= this->findChildren<QLineEdit *>(); 
for (int i=0;i<leList.size();i++){ 
   if( leList[i]->validator() != 0 ) {
      state = leList[i]->validator()->validate(leList[i]->text(), pos); 
      ...
   }
}

...
QList<QLineEdit *> leList= this->findChildren<QLineEdit *>(); 
for (int i=0;i<leList.size();i++){ 
   if( leList[i]->validator() != 0 ) {
      state = leList[i]->validator()->validate(leList[i]->text(), pos); 
      ...
   }
}

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[whitefurrows]

Hi,

now work all fine. Thank you very much. Your help was great!!!

Greetings,

Whitefurrows