Array of widgets and inputting the limit of for-loop iteration from the users

[Swati777999]

Hi All,

I want to know how to make an array of any widgets and keep building the widgets and placing them in a layout.

For example ,
debug() <<"Enter the number of widgets to be created";
// how to input the value for 'n'
for (int jj=0;jj<n;jj++) {
QTableWidget *myTable[jj]=new QTableWidget();
QGridLayout *tableLayout = new QGridLayout();
tableLayout->addWidget(myTable[jj],jj,0);
}

Any suggestion will be highly appreciated.

Thanks!

[Swati777999]

@JonB

 int n=7;
    QMap<int, QWidget *>myTables;
    for (int ii=0;ii<n;ii++)
    {  myTables[ii]=new QTableWidget();
       tableLayout->addWidget(myTables[ii],ii,0);
    }

I got the array implementation using QMap from the above code. Yaay !!

Now, I've to do the resizing part.

[JonB]

@Swati777999
You are already creating the number of widgets in the for loop. Just presumably do not create a new QTableWidget nor new QGridLayout within the loop: you don't want these newed each time, do you, you want to create them outside the loop and add the new widgets to a fixed QTableWidget/QGridLayout ? Or maybe your QTableWidget is the widget you want to create, you don't say. But why you want a new layout each time is beyond me.

// how to input the value for 'n'

However you want. Prompt the user to enter the n number in a dialog box? Obtain it from, say, a QSpinBox widget somewhere? We don't know.

QTableWidget *myTable[jj]=new QTableWidget();

This is not legal C++. You cannot declare a variable which is an indexed reference into an array.

It's difficult to discern what your actual question is.

[Swati777999]

@JonB

In C++, for inputting values, we write

int a;
cout<<"Enter the value for a" ;
cin>> a;

Is there any equivalent code of it in Qt? (Somewhat similar in look/appearance)

[Pl45m4]

@Swati777999

Qt is a GUI framework for C++ (and python). There is no Qt programming language.

If you have a GUI, use a QLineEdit or something similar for your user inputs.
To promt the user to enter some input, you can use
QInputDialog
(Note: It will show a dialog window)

• https://doc.qt.io/qt-5/qinputdialog.html#details

[Swati777999]

@Pl45m4

Thanks for your response.

I want to add an array of Tables to the main window . How can I do that?

My approach is as follows:

QWidget *myWidget = new QWidget();
QGridLayout *tableLayout = new QGridLayout();
int n = 6;
      QList <QTableWidget*> myTables;
      for(int ii=0;ii<n;ii++)
      { myTables.append(new QTableWidget());
        tableLayout->addWidgets(myTables,ii,0);
      }

The following line gives me an error as pointed out by @JonB :

 tableLayout->addWidgets(myTables,ii,0);

How can it be achieved?

[Swati777999]

@JonB

 int n=7;
    QMap<int, QWidget *>myTables;
    for (int ii=0;ii<n;ii++)
    {  myTables[ii]=new QTableWidget();
       tableLayout->addWidget(myTables[ii],ii,0);
    }

I got the array implementation using QMap from the above code. Yaay !!

Now, I've to do the resizing part.

[Thank You]

@Swati777999
If it is solved then why don't you mark it as solved.

[Swati777999]

@Thank-You
I've shared my solution and marked it as the best answer. Thanks.. :)