Manually calling lineEdit's textChanged

[root]

How to force call of lineEdit's textChanged at startup?
The workaround is:
@MainWindow::MainWindow(QWidget *parent) :
...
QString s = ui->vectorEdit->text()+" ";
ui->vectorEdit->setText(s);@

How to do it properly? And without adding a space.

[JKSH]

-You can subclass the QLineEdit and make it emit the signal in its constructor-

Edit: Sorry, I just realized you can't emit signals in a constructor, because you don't have time to connect it to a slot first!

[root]

And how to use such subclasses in Designer? If there is no way of inheritance?

[JKSH]

You can "promote" your custom widget to use it in Designer (see http://qt-project.org/doc/qt-4.8/designer-using-custom-widgets.html#promoting-widgets ). You can't see it in Designer though; there will be a blank space.

Without using inheritance, you can create a signal in your QMainWindow, connect that signal to QLineEdit::textChanged(), and make your QMainWindow emit that signal.

@
MainWindow : public QMainWindow
{
...
signals:
void started(QString);

public:
MainWindow(QWidget *parent) : QWidget(parent)
{
connect(this, SIGNAL(started(QString)),
ui->vectorEdit, SIGNAL(textChanged(QString)));

    emit started(ui->vectorEdit->text());
}

};
@

[JKSH]

Sorry, I just realized you can’t emit signals in a constructor, because you don’t have time to connect it to a slot first!