One signal to two window

andreyc

There are multiple solutions.
For example

create second window and connect all necessary signals inside first window constructor. I think signals are not delivered if a window is not shown.
In QPushButton::clicked() show second window.

kdbcz

I cant do it.

andreyc

What do you mean. Are there any errors?
Show what you have so far and we will help to fix it.

kdbcz

How can I use "QPushButton::clicked() show second window" in the main, if I have an UI window with that pushbutton? (I can open the second window from the first window, but than I cant make the connection between the worker thread and the second window with the same signal what iI use for the first window in the worker thread (because I initialized the worker in the main)).
I tried to send a signal from that pushbutton, but I cant do to the main.
My program is same now what you give me in the example.
Thank You!

andreyc

Add a pointer to Worker to WindowOne class. Initialize it in WindowOne constructor.
Use it when you opening second window.

kdbcz

It is working now. I initialize the worker and the second window in the first window constructor. And connect everything there.
Thank You!

kdbcz

Hello,
I have an other conection problem now.
I have a widget what I want to connect to my worker thread.
My thread is initialized in other class (Mainwindow).

widget .h:
@class RoverSatView : public QWidget
{
Q_OBJECT
public:
RoverSatView(QWidget *parent = 0);

protected:
void paintEvent(QPaintEvent *event);

private slots:
void slot_rtk_rover_sat_azel_in(const SatList &sats);

private:
    SatList satellites;
    rtk_thread worker;

};

widget .cpp:

RoverSatView::RoverSatView(QWidget *parent) : QWidget(parent)
{
connect(&worker,SIGNAL(rtk_rover_sat_azel(const SatList)),this,SLOT(slot_rtk_rover_sat_azel_in(const SatList)));
}@

No error message, but not working. What is the misstake?
Of course I have emit signal in the worker thread.

JohanSolo

connect(&worker,SIGNAL(rtk_rover_sat_azel(const SatList)),this,SLOT(slot_rtk_rover_sat_azel_in(const SatList)));

Did you register your SatList type?
By the way, there is no need to use the const in the connect statement.

andreyc

How do you assign worker from MainWindow to RoverSatView?
Are there any message in a console when you start the app?

kdbcz

Yes, the SatList type is registered.
No message in the consol.
I have this in the class RoverSatView header:
@ private:
rtk_thread worker;
@

@MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);

QThread* rtkthread=new QThread;
rtk_thread* worker=new rtk_thread;

...
worker->moveToThread(rtkthread);
connect(rtkthread, SIGNAL(started()), worker, SLOT(run()));
connect(worker, SIGNAL(finished()), rtkthread, SLOT(quit()));
connect(worker, SIGNAL(finished()), worker, SLOT(deleteLater()));
connect(rtkthread, SIGNAL(finished()), rtkthread, SLOT(deleteLater()));
rtkthread->start();

}
@
@class RoverSatView : public QWidget
{
Q_OBJECT
public:
RoverSatView(QWidget *parent = 0);

protected:
void paintEvent(QPaintEvent *event);

private slots:
void slot_rtk_rover_sat_azel_in(const SatList &sats);

private:
    SatList satellites;
    rtk_thread worker;

};@

andreyc

You start thread for one worker object in MainWindow and connect signals from different worker object in RoverSatView.

kdbcz

How can I conect in RoverSatView to the same worker as in MainWindow?

andreyc

If RoverSatView is a member of MainWindow then you can declare worker as member of MainWindow and then pass it RoverSatView constructor.
If it is not then allocate worker before MainWindow, pass it to MainWindow ctor and to RoverSatView.

kdbcz

Hello,

How can I pass it if RoverSatView is a widget in a generated UI tabwidget?

arsinte_andrei

then where you have the generation code you simply take that variable from there - from the constructor and connect it. just after it was constructed or generated

kdbcz

It is not working for me. "....was not declared in this scope"
How can I pass a variable to a designer generated ui object?

andreyc

Here is an example based on the sources you posted before.
See my comments below started with // <<

MainWindow.h
@
class MainWindow : public QMainWindow
{
...
rtk_thread* worker; // << Declare worker in MainWindow
RoverSatView* roverSatView;
};
@
MainWindow.cpp
@
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);

QThread* rtkthread = new QThread;
worker = new rtk_thread; // << Initialize it in ctor
...
worker->moveToThread(rtkthread);
connect(rtkthread, SIGNAL(started()), worker, SLOT(run()));
connect(worker, SIGNAL(finished()), rtkthread, SLOT(quit()));
connect(worker, SIGNAL(finished()), worker, SLOT(deleteLater()));
connect(rtkthread, SIGNAL(finished()), rtkthread, SLOT(deleteLater()));
rtkthread->start();
}

void MainWindow::createRoverSatView()
{
roverSatView = new RoverSatView(worker, this); // << pass it to RoverSatView
...
}
@

RoverSatView.h
@
class RoverSatView : public QWidget
{
Q_OBJECT
public:
RoverSatView(rtk_thread* rtkWorker, QWidget *parent = 0);
// << ctor accepts the worker from MainWindow

protected:
void paintEvent(QPaintEvent *event);

private slots:
void slot_rtk_rover_sat_azel_in(const SatList &sats);

private:
SatList satellites;
rtk_thread* worker; // << it will keep worker from MainWindow
};
@
RoverSatView.cpp
@
RoverSatView::RoverSatView(rtk_thread* rtkWorker, QWidget* parent)
: QWidget(parent)
, worker(rtkWorker) // << initialize using worker from MainWindow
{
// Initialize the Qt magic
connect(worker, SIGNAL(rtk_rover_sat_azel(SatList)),
this, SLOT(slot_rtk_rover_sat_azel_in(SatList)));
}
@

kdbcz

Thank You for Your help!
It is working now in a window, but I would like to add this RoverSatView to a tab of a tabwidget which is created in the creator. Is it possible, or I have to create the tabwidget in the code?

andreyc

You can use "QTabWidget::addTab()":http://qt-project.org/doc/qt-5/qtabwidget.html#addTab to put your widget into generated QTabWidget

kdbcz

Hello,

This is working:
@connect(worker,SIGNAL(active_window(double)),this,SLOT(slot_active_window(double)));@

This is not working:
@connect(this,SIGNAL(active_window(double)),worker,SLOT(slot_active_window(double)));@

Both in same place. I want to connect the thread (worker) and a window (this) in both direction.
Why the second not working? Or I have to put the "connect..." to the SLOT side?