Return to main widget

[3nc31]

Hi!!!

I have an application that goes to Widget 1 ---> Widget 2

I want to know how I can return to the main widget, Widget 1---> Widget 2 ---> Widget 1

//main.cpp
#include <QApplication>
#include "window.h"
 
 
 int main(int argc, char *argv[])
 {
     QApplication app(argc, argv);
     window window;
     app.setMainWidget(&window);
     window.show();
     return app.exec();
 }

//main.cpp
#include <QApplication>
#include "window.h"


 int main(int argc, char *argv[])
 {
     QApplication app(argc, argv);
     window window;
     app.setMainWidget(&window);
     window.show();
     return app.exec();
 }

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#ifndef WINDOW_H
#define WINDOW_H
#include <QWidget>
 
 
 class QPushButton;
 
 class principal;
 
 
//window.h
class window : public QWidget
 {
     Q_OBJECT
 
 public:
     window();
 
public slots:
 
	void showNew();
 
 public:
       //....	
	QPushButton *enter;	
	principal *prin;     
       //....
 }; 
#endif

#ifndef WINDOW_H
#define WINDOW_H
#include <QWidget>

 
 class QPushButton;

 class principal;

 
//window.h
class window : public QWidget
 {
     Q_OBJECT

 public:
     window();

public slots:

	void showNew();

 public:
       //....	
	QPushButton *enter;	
	principal *prin;     
       //....
 }; 
#endif

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//window.cpp
#include <QtGui>
 
#include "principal.h"
#include "window.h"
 
 
window::window()
{     
    enter = new QPushButton(tr("a"));	
   connect(enter, SIGNAL(clicked()), this, SLOT(showNew()));
}
 
void window :: showNew(){
 
	this -> close();
	prin = new principal;
	prin-> show();
 
}

//window.cpp
#include <QtGui>

#include "principal.h"
#include "window.h"

 
window::window()
{     
    enter = new QPushButton(tr("a"));	
   connect(enter, SIGNAL(clicked()), this, SLOT(showNew()));
}

void window :: showNew(){
	
	this -> close();
	prin = new principal;
	prin-> show();

}

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//principal.h
#ifndef PRINCIPAL_H
#define PRINCIPAL_H
#include <QWidget>
 
 
 class QPushButton;
 
 
class principal : public QWidget
 {
     Q_OBJECT
 
 public:
     principal();
 
public slots:
 
	void returnWindow();
 
 public:
       //....	
	QPushButton *return;	  
       //....
 }; 
#endif

//principal.h
#ifndef PRINCIPAL_H
#define PRINCIPAL_H
#include <QWidget>

 
 class QPushButton;

  
class principal : public QWidget
 {
     Q_OBJECT

 public:
     principal();

public slots:

	void returnWindow();

 public:
       //....	
	QPushButton *return;	  
       //....
 }; 
#endif

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//principal.cpp
#include <QtGui>
 
#include "principal.h"
#include "window.h"
 
 
principal:: principal()
{     
    return = new QPushButton(tr("b"));	
   connect(return, SIGNAL(clicked()), this, SLOT(returnWindow()));
}
 
void principal :: returnWindow(){
 
	this -> close();
	//Here I want to return to the main widget
}

//principal.cpp
#include <QtGui>

#include "principal.h"
#include "window.h"

 
principal:: principal()
{     
    return = new QPushButton(tr("b"));	
   connect(return, SIGNAL(clicked()), this, SLOT(returnWindow()));
}

void principal :: returnWindow(){
	
	this -> close();
	//Here I want to return to the main widget
}

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Thanks!!!

[mchara]

hello
[

void window :: showNew(){
 
this -> close(); 
prin = new principal(this); /// set parent of second widget to first one
prin->show(); 
 
}

void window :: showNew(){

this -> close(); 
prin = new principal(this); /// set parent of second widget to first one
prin->show(); 

}

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then you'll be able to

void principal::goBack()
  {
  this -> close(); 
  parent()->show(); 
  }

void principal::goBack()
  {
  this -> close(); 
  parent()->show(); 
  }

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Note also that you're creating a instance of principal every time you enters it and you're not removing it after going back to main widget.
You should create a single instance of principal in window's constructor and memorize a pointer to it. Then show/hide this instance by stored pointer and destroy it in window's destructor.

[3nc31]

I did it...but it didn't work.....this was the error:

principal.cpp: In member function ‘void principal::goBack()’:
principal.cpp:205: error: ‘class QObject’ has no member named ‘show’
make: *** [principal.o] Error 1

[Gopala Krishna]

Have you tried QWizard ?

[wysota]

I'm not sure what you are trying to do, but your issue is simply related to C++ skills and neither QWizard or any other Qt class won't help you with that. If you want to access some method of an object, you need to have a reference or a pointer to the object available and it needs to be cast to a proper type. Again, I don't know what you are trying to do, but you might want to take a look at QStackedWidget although you'll still have to manipulate pointers and scopes.

[3nc31]

I'm doing an application that: show a window (QWidget 1) where you fill the form and sign in....when you are in, show a window (QWidget 2) where you can do some activities that aren't relevant for this topic,well this QWidget 2 has a "Disconnect" button, when it's clicked the application must return to QWidget 1....How can I do this???

[wysota]

Stop treating it as "returning from widget2 to widget1". Just open a new instance of widget1 like you did the first time (probably in main()).

[3nc31]

New instance?? It doesn't work or there is something that I'm doing wrong, for that reason I write here a code example for someone could tell me what and where I should put the correct code.

Thanks!!!!!!

[mchara]

I did it...but it didn't work.....this was the error:

principal.cpp: In member function ‘void principal::goBack()’:
principal.cpp:205: error: ‘class QObject’ has no member named ‘show’
make: *** [principal.o] Error 1

as wysota said, you should cast a pointer.
parent() returns QObject,
show() is a method of QWidget,
QWidget inherits QObject, so...

try
((QWidget*)parent())->show();

[jpn]

as wysota said, you should cast a pointer.
parent() returns QObject,
show() is a method of QWidget,
QWidget inherits QObject, so...

try
((QWidget*)parent())->show();

Notice that there is a specialized method for this: QWidget::parentWidget()