How to access widgets in different tabs of QTabWidget? - c++

Question

I know how to create a new tab and add new widgets to a new tab of QTabWidget.
My Code:
QPlainTextEdit *plainTextEdit = new QPlainTextEdit;
ui->tabWidget->addTab(plainTextEdit , "New");
When I clicked the button, new tab and its own QPlainTextEdit widget will be created.
But I don't know how to set property to different QPlainTextEdit or save their contents.
For example, I want set font size of QPlainTextEdit in tab4 and save contents of QPlainTextEdit in tab5.
How to achieve these functions?

Answer 1

To get the widget at a tab index you can use the widget function of QTabWidget .
In your case in which QPlainTextEdit is the only widget of every tab page :
QPlainTextEdit* plainTextEdit = (QPlainTextEdit*) ui->tabWidget->widget(0); // for the first tab
plainTextEdit->setPlainText("Hello!");
If the QPlainTextEdit is not the only widget, you need to get the children of the widget and find the QPlainTextEdit in them :
QList<QPlainTextEdit *> allTextEdits = ui->tabWidget->widget(0)->findChildren<QPlainTextEdit *>();
if (allTextEdits.count() >0)
allTextEdits[0]->setPlainText("Hello!");;

Answer 2

You should have pointers to your QPlainTextEdits as members of the main widget class:
class Widget : public QWidget
{
Q_OBJECT
public:
Widget(QWidget *parent = 0);
~Widget();
void someFunction();
private:
QPlainTextEdit *plainTextEdit;
}
Widget::Widget(QWidget *parent)
: QWidget(parent)
{
...
plainTextEdit = new QPlainTextEdit;
ui->tabWidget->addTab(plainTextEdit , "New");
}
void Widget::someFunction()
{
plainTextEdit->setPlainText("Hello!");
}