WIdget relationship with Main Window

[Robobulls]

Hello all, I am fairly new to Qt so do not know all the ins and outs yet but I am attepting to create a simple matrix program with the results beign that when one parameter changes in the main window the widget is affected and shows the results. I have been reading online forums and all seem to say that interaction with Ui of the main window and the Ui of the widget is not allowed I also found another thread with a sample code on how to make it work (I will also post in bottom.) the code seemed to work but when attempting to compile several error messages came up

#include <QMainWindow>
#include "array.h"
#include "matrix.h"
//trying to get windows to recognize Matrix ui
namespace Ui {
  class MainWindow;
}
 
class MainWindow : public QMainWindow
{
  Q_OBJECT
 
public:
  explicit MainWindow(QWidget *parent = 0);
  ~MainWindow();
  Ui::MainWindow *ui;//made ui public instead of private
  Ui::Matrix*yw;//Here is the change I was recomended to add the widget class Ui to my main window
 
 
 
private:
 
 
protected:
  void mousePressEvent(QMouseEvent * e);
private slots:
  void on_radioButton_clicked(bool checked);
};
 
#endif // MAINWINDOW_H

#include <QMainWindow>
#include "array.h"
#include "matrix.h"
//trying to get windows to recognize Matrix ui
namespace Ui {
  class MainWindow;
}

class MainWindow : public QMainWindow
{
  Q_OBJECT
  
public:
  explicit MainWindow(QWidget *parent = 0);
  ~MainWindow();
  Ui::MainWindow *ui;//made ui public instead of private
  Ui::Matrix*yw;//Here is the change I was recomended to add the widget class Ui to my main window
  


private:


protected:
  void mousePressEvent(QMouseEvent * e);
private slots:
  void on_radioButton_clicked(bool checked);
};

#endif // MAINWINDOW_H

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Then in my Cpp file i added this line

void MainWindow::on_radioButton_clicked(bool checked)
{
  yw->label->setText("on");//Also recommendation
}

void MainWindow::on_radioButton_clicked(bool checked)
{
  yw->label->setText("on");//Also recommendation
}

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here is the error I recieved after compilation

ui_mainwindow.h:39: error: 'Matrix' does not name a type//

When this did'nt work I made some changes to the Cpp again attempting to establish a parent child relationship with the widget and main window but I am not sure if I was succesful

ui(new Ui::MainWindow),matrix(new Ui::Matrix)//here is what I changed
{
  ui->setupUi(this);
  matrix->setupUi(this->ui->centralWidget);//Added this

ui(new Ui::MainWindow),matrix(new Ui::Matrix)//here is what I changed
{
  ui->setupUi(this);
  matrix->setupUi(this->ui->centralWidget);//Added this

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I am at a bit of a dead end with how to approach this now hope someone can help

[amleto]

Qt is not something you can just use without good knowledge of c++. I suggest you do some reading + exercises on basic c++.

There is no need to make those pointers public.

You ask us to diagnose compiler error about Matrix, but don't even show us Matrix code...

All of what you have found/been recommended seems incorrect or you have misunderstood, to be honest.

[Robobulls]

Thanks for the reply I am doing research in QT and am doing exercises. What my question was asking and I am sorry if I was unclear is if it is possible to have a widget created inside of the main window be affected by the main window (when main window info changes it is reflected in the widget) and what is the best way to attempt this. Like you said a lot of the information I have found is incorrect or unrelated to my problem.

[KaptainKarl]

If you put a QPushButton on the MainWindow and put a QLabel on the MainWindow and then write a slot for the QPushButton that alters the text in the QLabel, have you not done something in the MainWindow that affected the QLabel widget?

Perhaps I am not understanding your question. Have you attempted the Application Example in the Qt Reference documentation? ()

Karl

[Robobulls]

I have tried using the Qpushbutton but when I try to put the ui location for my widget the only recognized ui is the main windows