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