QlineEdit - restoring text from hide/closed window.

[Wojtek1990]

Hi.

I've searched a lot but I can't find answer how to do it... I've done by Qt Designer signal/slot which call window hide () function after click on OK button... but after opening this window again by code:

App *app = new App(this);
app->show();


QlineEdit object text is empty - don't save written by me text, is restored to default state (Qline object projected in QtDesigner as empty at start). What to do to always display text which I've writtem in this Qline object ?


1.

void App::on_OK_clicked()
{
    (ui->message)->setText(oldMessage);
}

void App::on_OK_clicked()
{
    (ui->message)->setText(oldMessage);
}

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don't work.

2. slot/signal which make update () function on QLine when OK button pressed in Qt designer also ...

[saa7_go]

Can you post more complete code?

[Wojtek1990]

Problem seems to be in this code:

Tasker *tasker = new Tasker(this);
    tasker->show();

Tasker *tasker = new Tasker(this);
    tasker->show();

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It open new window with default object values. How to open ALREADY HIDDEN window ?

When I use function Tasker::show(); in file tasker.cpp it works - window is restored to state before hidding.
But when I use this function in mainwindow.cpp file

void MainWindow::on_actionTasker_activated()
{
if (OpenFirstTime == 0) {
    Tasker *tasker = new Tasker(this);
    tasker->show();
    OpenFirstTime=1;
    }
    else {
        //Tasker d;
        //d.show(); -> open window just for second
        Tasker::show(); // makes error
        }
}

void MainWindow::on_actionTasker_activated()
{
if (OpenFirstTime == 0) {
    Tasker *tasker = new Tasker(this);
    tasker->show();
    OpenFirstTime=1;
    }
    else {
        //Tasker d;
        //d.show(); -> open window just for second
        Tasker::show(); // makes error
        }
}

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I got error:

Cannot call member function 'Void QWidget::show()' without object

Cannot call member function 'Void QWidget::show()' without object

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How to solve it ?

[wysota]

but after opening this window again by code:

App *app = new App(this);
app->show();


QlineEdit object text is empty

It's not the same window. It's a similar window.

If you want to retrieve the data from the closed window, you have to access variables corresponding to this particular window instead of creating a new one.

[Wojtek1990]

you have to access variables corresponding to this particular window instead of creating a new one.

By pointers ? How to do it ? Could anyone post example ?

[wysota]

Hmm... what are your C++ skills? Can you tell a difference between a class and an object?