Nested widgets, the inner widgets are not visible

[cdwijs]

Hi All,

I have written a component that talks to the serial port. This component is made by using a QSplitter, and adding 2 buttins, a label and two LED indicators to it. When I then write the following I get 4 windows, 2 RS232's and two RS232monitor windows:

rs232Rx = new RS232() //no parent
rs232Tx = new RS232();
myLog = new QTextBrowser();
myHlayout = new QSplitter();
myVlayout = new QSplitter();
myVlayout->setOrientation(Qt::Vertical);
myVlayout->addWidget(myLog);
myVlayout->addWidget(rs232Rx);
myHlayout->setParent(parent);
myVlayout->show();
rs232Rx->show();
rs232Tx->show();

When I write the following, I get 2 windows, both called Rs232Monitor, one with a splitter, and one blank window.

rs232Rx = new RS232(this) //parent
rs232Tx = new RS232(this);
myLog = new QTextBrowser();
myHlayout = new QSplitter();
myVlayout = new QSplitter();
myVlayout->setOrientation(Qt::Vertical);
myVlayout->addWidget(myLog);
myVlayout->addWidget(rs232Rx);
myHlayout->setParent(parent);
myVlayout->show();
rs232Rx->show();
rs232Tx->show();

How can I change my code, so I get one window, with a QTextBrowser on top, and then 2 RS232 widgets side by side below it?
Cheers,
Cedric

[cdwijs]

[0_1523618792252_New folder.zip](Uploading 100%)

[cdwijs]

I have placed the above code on github:

https://github.com/cdwijs/rs232monitor

Cheers,
Cedric

[VRonin]

rs232Rx = new RS232(this);
rs232Tx = new RS232(this);
myLog = new QTextBrowser(this);
myHlayout = new QSplitter(this);
myVlayout = new QSplitter(this);
myVlayout->setOrientation(Qt::Vertical);
myHlayout->setOrientation(Qt::Horizontal);
myHlayout->addWidget(rs232Rx);
myHlayout->addWidget(rs232Tx);
myVlayout->addWidget(myLog);
myVlayout->addWidget(myHlayout);
QHBoxLayout* mainLay=new QHBoxLayout(this);
mainLay.addWidget(myVlayout);

[mrjj]

Hi
If you do not give a Widget a parent or insert into other widget, it becomes
a window if you show it.

[cdwijs]

Thanks everybody,
It turns out that the constructor of the RS232 widgets has to be told myHlayout is the parent, and then also have to be added to myHlayout . Strange, but it now works:

    myLog = new QTextBrowser();
    myHlayout = new QSplitter();
    myVlayout = new QSplitter();
    rs232Rx = new RS232(myHlayout);
    rs232Tx = new RS232(myHlayout);
    myVlayout->setOrientation(Qt::Vertical);
    myHlayout->setOrientation(Qt::Horizontal);
    myHlayout->addWidget(rs232Rx);
    myHlayout->addWidget(rs232Tx);
    myVlayout->addWidget(myLog);
    myVlayout->addWidget(myHlayout);
    myVlayout->show();

Cheers,
Cedric