how resize the Qwidget objects within a window

**vinayaka** · 25th May 2011, 08:29

Qt Code:

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#include "widget.h"
#include "ui_widget.h"\
#include"day25.h"
 
Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    QString n;
    n=ui->lineEdit->text();
}
 
Widget::~Widget()
{
    delete ui;
}
 
void Widget::on_pushButton_3_clicked()
{
   day25 *k=new day25;
   k->show();
   this->hide();
 
}
 
////////////////////////
and in day25.cpp
///////////////////////////////
#include "day25.h"
#include "ui_day25.h"
#include"widget.h"
 
day25::day25(Widget *parent) :
    Widget(parent),
    ui(new Ui::day25)
{
 
    ui->setupUi(this);
    QString n;
    ui->label_2->setText(n);
 
 
}
 
day25::~day25()
{
    delete ui;
}

#include "widget.h"
#include "ui_widget.h"\
#include"day25.h"

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    QString n;
    n=ui->lineEdit->text();
}

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

void Widget::on_pushButton_3_clicked()
{
   day25 *k=new day25;
   k->show();
   this->hide();

}

////////////////////////
and in day25.cpp
///////////////////////////////
#include "day25.h"
#include "ui_day25.h"
#include"widget.h"

day25::day25(Widget *parent) :
    Widget(parent),
    ui(new Ui::day25)
{

    ui->setupUi(this);
    QString n;
    ui->label_2->setText(n);


}

day25::~day25()
{
    delete ui;
}

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i tried, i entered a value and clicked the button but 2nd page(day25)is shown with previous one's object and no value is displayed

**Santosh Reddy** · 25th May 2011, 08:58

Just to help you figure you things, how do you expect "day25" class constructor to know about the value in you "Widget" class, you need to pass the text in the constructor parameter.

By the the way, the way you are using the widget is not the right way to do, point to review:
1. in "on_pushButton_3_clicked()" you create a new "day25" and show it, ok fine so far. why doe you hide this, if you hide this, I don;t see code to bring it back on screen, it is not brought back, it will lying in memory, used

2. once you dispaly "day25" how do you go back?

I would recommend you to go through the sample examples in the Qt documentation, try editing them and see how each change behaves, and try modifying one of the sample to beahave as you wanted. Take your time to understand.

**vinayaka** · 25th May 2011, 11:23

i coded like this . if this is stupid forgive me okay

Qt Code:

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//////////day25.cpp
#include "day25.h"
#include "ui_day25.h"
#include "widget.h"
 
 
day25::day25(Widget *parent) :
    Widget(parent),
    ui(new Ui::day25)
{
 
    ui->setupUi(this);
    //int num=100;
    QString qStr = QString::number(num);
    ui->label_2->setText(qStr);
 
 
}
 
day25::~day25()
{
    delete ui;
}
 
////////////widget.cpp
#include "widget.h"
#include "ui_widget.h"\
#include "day25.h"
//#include<QString>
 
Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    //QString n;
    //n=ui->lineEdit->text();
    QString str;
    float num;
    str=ui->lineEdit->text();
    num=str.toInt();
 
}
 
Widget::~Widget()
{
    delete ui;
}
 
void Widget::on_pushButton_3_clicked()
{
   day25 *k=new day25;
   k->show();
   this->hide();
 
 
}
 
//////day25.h
#ifndef DAY25_H
#define DAY25_H
 
#include <QWidget>
#include "widget.h"
 
namespace Ui {
    class day25;
}
 
class day25 : public Widget
{
    Q_OBJECT
 
public:
    explicit day25(Widget *parent = 0);
    ~day25();
 
private:
    Ui::day25 *ui;
};
 
#endif // DAY25_H
 
/////widget.h
#ifndef WIDGET_H
#define WIDGET_H
 
#include <QWidget>
 
namespace Ui {
    class Widget;
}
 
class Widget : public QWidget
{
    Q_OBJECT
 
public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();
 
private:
    Ui::Widget *ui;
 
private slots:
    void on_pushButton_3_clicked();
};
 
#endif // WIDGET_H

//////////day25.cpp
#include "day25.h"
#include "ui_day25.h"
#include "widget.h"


day25::day25(Widget *parent) :
    Widget(parent),
    ui(new Ui::day25)
{

    ui->setupUi(this);
    //int num=100;
    QString qStr = QString::number(num);
    ui->label_2->setText(qStr);


}

day25::~day25()
{
    delete ui;
}

////////////widget.cpp
#include "widget.h"
#include "ui_widget.h"\
#include "day25.h"
//#include<QString>

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    //QString n;
    //n=ui->lineEdit->text();
    QString str;
    float num;
    str=ui->lineEdit->text();
    num=str.toInt();

}

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

void Widget::on_pushButton_3_clicked()
{
   day25 *k=new day25;
   k->show();
   this->hide();


}

//////day25.h
#ifndef DAY25_H
#define DAY25_H

#include <QWidget>
#include "widget.h"

namespace Ui {
    class day25;
}

class day25 : public Widget
{
    Q_OBJECT

public:
    explicit day25(Widget *parent = 0);
    ~day25();

private:
    Ui::day25 *ui;
};

#endif // DAY25_H

/////widget.h
#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>

namespace Ui {
    class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT

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

private:
    Ui::Widget *ui;

private slots:
    void on_pushButton_3_clicked();
};

#endif // WIDGET_H

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error:num is not declared in this scope.
if command is removed answer is always 100

plz help meeeeeeeeee

**wysota** · 25th May 2011, 13:40

Your problems are caused by your lack of understanding of C++ or even programming in general. The fact that you have a variable "x" in some place doesn't mean that another variable called "x" in a different scope will have the same value as the other one.