Why did such parameter(local class variable and promoted class variable using QT Designer) update synchronized?

tomohiro01

Dear all,

I make sample widget program using QT 5.8 and QT Designer GUI.
I add QWidget and promoted class(It called glwidet_1 class).
And also, I added local class variable glwidget_2 in mainwindow.

I updated glwidget_2 parameter only, but glwidget_1 parameter updated at same time.

glwidget_2->paramA and ui->widget->paramA are same.

I would like to independent such parameter.

How to independent that? and I would like to understand that synchronize timing.

Best Regards,

mrjj

Hi
In the context of a class. what you you mean by parameter ?

Unless you made some of the class member variable static for glwidget_2 , there is no reason it should change for ui->widget->paramA

The object in ui->xxx is another instance than any you put as a member in mainwindow.

Or maybe I dont understand what you see.

If its related to anything openGl then you should show code.

tomohiro01

Hello mrjj,

Thank you for your quick response.

I write source code below.

MainWindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QTimer>
#include "glwidget.h"
#include <QWheelEvent>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    GLWidget *controller;

private:
    Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H

MainWindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

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

    controller = new GLWidget();

    controller->val = 1.0;

}

glwidget.cpp

#include "glwidget.h"

GLWidget::GLWidget(QWidget *parent) :
    QGLWidget(parent)
{
   
}

GLfloat val = 0.0;		//local variable

void GLWidget::initializeGL() {

    qglClearColor(Qt::white); 

    glEnable(GL_LIGHT0);
    glEnable(GL_LIGHTING);

    glEnable(GL_DEPTH_TEST);

}

void GLWidget::paintGL() {

}

void GLWidget::resizeGL(int w, int h){
    glViewport(0, 0, w, h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(60.0, (GLdouble)w / (GLdouble)h, 1.0, 10.0);
}

glwidget.h

#ifndef GLWIDGET_H
#define GLWIDGET_H

#include <QGLWidget>
#include<iostream>
#include <glu.h>
#include <GLUT/glut.h>
#include<math.h>

class GLWidget : public QGLWidget
{
    Q_OBJECT
public:
    GLWidget(QWidget *parent = 0);
    ~GLWidget();

    void initializeGL();
    void paintGL();
    void resizeGL(int w, int h);

};

#endif // GLWIDGET_H

I used source code above.

And I tried

cout << ui->widget->val; // A
cout << controller->val; // B

in MainWindow.cpp

A and B is same value.
(I expected val A is 0.0, val B is 1.0)

Do you understand about this problem?

Best regards,

mrjj

Hi
I think understand.

But it looks like
GLfloat val = 0.0; //local variable
is not inside the class ?
Is that correct ?

class GLWidget : public QGLWidget
{
    Q_OBJECT
public:
    GLWidget(QWidget *parent = 0);
    ~GLWidget();

    void initializeGL();
    void paintGL();
    void resizeGL(int w, int h);
    GLfloat val = 0.0;	 <<<<<<<< ?
};

tomohiro01

Thank you for your attention.
I re-check source code and header file.
It maybe solve the problem.
#I have a mistake, sorry...

Thanks a lot!

mrjj

@tomohiro01
Ok. Super np.
Happy work.