3 widgets in only one central widget

[VenAle17]

Hi all,
I would like to show in the central widget of mine MainWindow.ui 3 Widgets (1 QCustomplot and 2 QLed) but my program, as i wrote, gives me the possibility to show in the central widget only the first.

    QLed *led_1 = new QLed;
    QLed *led_2 = new QLed;
    QHBoxLayout *mainLayout = new QHBoxLayout;
    QVBoxLayout *layout = new QVBoxLayout;
    mainLayout->addWidget(m_plot);
    //mainLayout->addWidget(layout);
    layout->addWidget(led_1);
    layout->addWidget(led_2);


    setCentralWidget(m_plot);
    //setCentralWidget(m_luce);
[...]
     m_plot->addGraph();
      m_plot->graph(0)->setPen(QPen(Qt::blue));

      // give the axes some labels:
      m_plot->xAxis->setLabel("Time (sec.)");
      m_plot->yAxis->setLabel("Range (mm)");

      QSharedPointer<QCPAxisTickerTime> timeTicker(new QCPAxisTickerTime);
      timeTicker->setTimeFormat("%s");
      m_plot->xAxis->setTicker(timeTicker);
      m_plot->axisRect()->setupFullAxesBox();
      m_plot->yAxis->setRange(0, 2200);

      // configure right and top axis to show ticks and labels:
      m_plot->xAxis2->setVisible(true);
      m_plot->xAxis2->setTickLabels(false);
      m_plot->yAxis2->setVisible(true);
      m_plot->yAxis2->setTickLabels(false);
[...]

This is the mainwondow.ui . In the centralWidget there are plot on the left, and 2 leds on the right (1 on the top right corner and the other on the bottom right).
Any suggestion?
I tried to use only mainwindow.ui to solve this problem but at the end the graph did not receive the data to plot.

[jsulm]

@venale17 said in 3 widgets in only one central widget:

setCentralWidget(m_plot);

If m_plot is your central widget then the other two needs to be children of it. Or use another widget as central widget where you put all 3 widget.

[VenAle17]

Hi jsum, can you give me some example? Because I don't understand.
You think that i should create a pointer like QLed *led and then transforms it in a "children"? Sorry but i don't know how to do it...

[jsulm]

@venale17

QLed *led_1 = new QLed(m_plot);
QLed *led_2 = new QLed(m_plot);

Or, if you want to use a common widget as central widget:

QWidget *centralWidget = new QWidget();
m_plot = new WHAT_EVER_IT_IS(centralWidget);
QLed *led_1 = new QLed(centralWidget);
QLed *led_2 = new QLed(centralWidget);
// Set up layouts here
setCentralWidget(centralWidget);

In the code you posted your leds are not put on any widgets and the layout you're using for them is not set on any widget or other layout.

[VenAle17]

@jsulm
Ah, i'm sorry, i have another class where there are functions that creates and transforms the leds (the shape and the color) when some conditions are satisfied.

[VenAle17]

Ok now they're working. Now i have to fix this problem of overlapping, maybe i can divide the central widget in 2 section... but thanks for your help @jsulm

[SGaist]

Hi,

Use the layouts you had before and put the main layout in the container widget.

[VenAle17]

Hi @SGaist,
sorry but i don't understand what you mean with "container widget".
I cannot write setCentralWidget(mainwidget) because qt give me an error

[mrjj]

@venale17 said in 3 widgets in only one central widget:

"container widget".

Hi
that is just a term for the widget holding it all.
From @jsulm code, its the centralWidget

QWidget *centralWidget = new QWidget(); // this is our "container widget"
m_plot = new QCustomPlot(centralWidget);
QLed *led_1 = new QLed(centralWidget);
QLed *led_2 = new QLed(centralWidget);
// Set up layouts here
setCentralWidget(centralWidget);

what error do you get from this code ?

[VenAle17]

Ok, maybe i understand:
i wrote this:

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    m_plot(new QCustomPlot),
    m_ui(new Ui::MainWindow),
    m_luce(new Luce(m_plot)),
    m_status(new QLabel),
    m_console(new Console),
    m_settings(new SettingsDialog),
//! [1]
    m_serial(new QSerialPort(this))
//! [1]
{
//! [0]
    m_ui->setupUi(this);
    m_console->setEnabled(false);

    QWidget *centralWidget = new QWidget(); // this is our "container widget"
    m_plot = new QCustomPlot(centralWidget);
    m_luce = new Luce(centralWidget);
    
    // Set up layouts here
    QHBoxLayout *mainlayout = new QHBoxLayout(centralWidget);
    mainlayout->addWidget(m_plot);
    mainlayout->addWidget(m_luce);
    setCentralWidget(centralWidget);
[...]

I create a pointer m_luce that describes the features of the leds and, with your examples i reach a good solution:

[mrjj]

Hi
Super.
But you create them twice which is not needed.

you have
m_plot(new QCustomPlot), // you new them here
m_luce(new Luce(m_plot)),

so you can just do

QWidget *centralWidget = new QWidget(); // this is our "container widget"
m_plot = new QCustomPlot(centralWidget); we have new them already
m_luce = new Luce(centralWidget);

// Set up layouts here
QHBoxLayout *mainlayout = new QHBoxLayout(centralWidget);
mainlayout->addWidget(m_plot);
mainlayout->addWidget(m_luce);

[VenAle17]

Hi,
Yes, i have already changed it, but thanks for everything.

[alex17]

Hi all,
I have the same problem again.
I don't change anything of the code, just the PC.
I reinstalled Qt and i noticed that:

and this, is the code that i wrote, with you're helps:

m_ui->setupUi(this);
    m_console->setEnabled(false);
    QWidget *centralWidget = new QWidget(); // creo un container widget che raccolga i widget che creerò

        // Set up layouts here
        QHBoxLayout *mainlayout = new QHBoxLayout(centralWidget);       //imposto un layout orizzontale
        mainlayout->addWidget(m_plot);
        mainlayout->addWidget(m_luce);
        mainlayout->addStretch();
        //aggiungo l'oggetto puntato da m_plot e m_luce all'interfaccia secondo il layout orizzontale
        setCentralWidget(centralWidget);



    setCentralWidget(centralWidget);

Someone have any idea? How can i divide the central widget in two equal part, one for the plot and the other for the leds?

[mrjj]

@alex17
hi
remove the line
mainlayout->addStretch();
and see.

in fast test with your code (using buttons )
(without that line.)

else it looks like ((with that line.))

as you insert the stretch after the other widgets.