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(C++) Answer of exercise: Qt hide and show #2

 

Answer of exercise: Qt hide and show #2 is the answer of the exercise Qt hide and show #2.

 

 

 

 

 

Solution

 

 

 

 

 

 

 

Qt project file: CppExerciseQtHideAndShow2Answer.pro

 

QT       += core gui
TARGET = CppExerciseQtHideAndShow2Answer
TEMPLATE = app
SOURCES += \
    main.cpp\
    firstdialog.cpp \
    seconddialog.cpp \
    thirddialog.cpp
HEADERS  +=  \
    firstdialog.h \
    seconddialog.h \
    thirddialog.h
FORMS    += \
    firstdialog.ui \
    seconddialog.ui \
    thirddialog.ui

 

 

 

 

 

firstdialog.h

 

#ifndef FIRSTDIALOG_H
#define FIRSTDIALOG_H

#include <QDialog>

namespace Ui {
class FirstDialog;
}

class FirstDialog : public QDialog
{
    Q_OBJECT
    
public:
    explicit FirstDialog(QWidget *parent = 0);
    ~FirstDialog();
    
private slots:
    void close_child();
    void on_pushButton_clicked();

private:
    Ui::FirstDialog *ui;
    bool m_show_child;
};

#endif // FIRSTDIALOG_H

 

 

 

 

 

firstdialog.cpp

 

#include "seconddialog.h"
#include "firstdialog.h"
#include "ui_firstdialog.h"

FirstDialog::FirstDialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::FirstDialog),
    m_show_child(false)
{
  ui->setupUi(this);
}

FirstDialog::~FirstDialog()
{
    delete ui;
}

void FirstDialog::close_child()
{
  m_show_child = false;
}

void FirstDialog::on_pushButton_clicked()
{
  SecondDialog d;
  this->hide();
  QObject::connect(&d,SIGNAL(close_me()),this,SLOT(close_child()));
  m_show_child = true;
  while (m_show_child)
  {
    d.exec();
  }
  this->show();
}

 

 

 

 

 

main.cpp

 

#include <QtGui/QApplication>
#include "firstdialog.h"

int main(int argc, char *argv[])
{
  QApplication a(argc, argv);
  FirstDialog w;
  w.show();
  a.exec();
}

 

 

 

 

 

seconddialog.h

 

#ifndef SECONDDIALOG_H
#define SECONDDIALOG_H

#include <QDialog>

namespace Ui {
class SecondDialog;
}

class SecondDialog : public QDialog
{
    Q_OBJECT
    
public:
    explicit SecondDialog(QWidget *parent = 0);
    ~SecondDialog();
    
private slots:
    void close_child();

    void on_button_goto_third_clicked();

    void on_button_back_to_first_clicked();

protected:
    void closeEvent(QCloseEvent *);

signals:
    void close_me();

private:
    Ui::SecondDialog *ui;
    bool m_show_child;
};

#endif // SECONDDIALOG_H

 

 

 

 

 

seconddialog.cpp

 

#include <cassert>
#include "seconddialog.h"
#include "ui_seconddialog.h"
#include "thirddialog.h"

SecondDialog::SecondDialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::SecondDialog),
    m_show_child(false)
{
  ui->setupUi(this);
}

SecondDialog::~SecondDialog()
{
  delete ui;
}

void SecondDialog::close_child()
{
  m_show_child = false;
}

void SecondDialog::closeEvent(QCloseEvent *)
{
  emit close_me();
}

void SecondDialog::on_button_back_to_first_clicked()
{
  close();
}

void SecondDialog::on_button_goto_third_clicked()
{
  ThirdDialog d;
  this->hide();
  QObject::connect(&d,SIGNAL(close_me()),this,SLOT(close_child()));
  m_show_child = true;
  while (m_show_child)
  {
    d.exec();
  }
  if (d.m_back_to_which_dialog == 1)
  {
    this->close();
  }
  else
  {
    this->show();
  }
}

 

 

 

 

 

thirddialog.h

 

#ifndef THIRDDIALOG_H
#define THIRDDIALOG_H

#include <QDialog>

namespace Ui {
class ThirdDialog;
}

class ThirdDialog : public QDialog
{
    Q_OBJECT

    
public:
    explicit ThirdDialog(QWidget *parent = 0);
    ~ThirdDialog();

    int m_back_to_which_dialog;

protected:
    void closeEvent(QCloseEvent *);

private slots:
    void on_button_back_to_first_clicked();

    void on_button_back_to_second_clicked();

signals:
  void close_me();

private:
    Ui::ThirdDialog *ui;
};

#endif // THIRDDIALOG_H

 

 

 

 

 

thirddialog.cpp

 

#include "thirddialog.h"
#include "ui_thirddialog.h"

ThirdDialog::ThirdDialog(QWidget *parent) :
    QDialog(parent),
    m_back_to_which_dialog(2), //When user closes the dialog, go back to the previous/second dialog
    ui(new Ui::ThirdDialog)
{
  ui->setupUi(this);
}

ThirdDialog::~ThirdDialog()
{
  delete ui;
}

void ThirdDialog::closeEvent(QCloseEvent *)
{
  emit close_me();
}

void ThirdDialog::on_button_back_to_first_clicked()
{
  m_back_to_which_dialog = 1;
  close();
}

void ThirdDialog::on_button_back_to_second_clicked()
{
  m_back_to_which_dialog = 2;
  close();
}

 

 

 

 

 

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