How to acess value of lineedit in main window class to another class of widget

sidharth

i have one class main window and by drag and drop i have created a widget and promoted it to another class.
now i m having my lineedit and pushbutton on mainwindow .i want to access the value of lineedit to the widget class on a click of button.
please help me out as i am new to qt.how can i access the value of mainwindow class to the widget class

any help will be appreciated.i am doing it lyk this:

.h
@
#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QtGui>

namespace Ui {
class MainWindow;
}

class MyWidget : public QWidget
{
Q_OBJECT

public:
MyWidget(QWidget *parent = 0);

private:
QPushButton *myPushBtn;
};

class MainWindow : public QMainWindow
{
Q_OBJECT

public:
MainWindow(QWidget *parent = 0);
~MainWindow();

private slots:
void on_pushButton_2_clicked();

private:
Ui::MainWindow *ui;
MyWidget *wid;
};

#endif // MAINWINDOW_H
@

.cpp

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

MyWidget::MyWidget(QWidget *parent):
QWidget(parent)
{
}

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

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

void MainWindow::on_pushButton_2_clicked()
{

}
@

please help me by adding in codes

8majkel8

@
QString MyWidget::theValue() const {
return ui->myPushBtn->text();
}
@

vezprog

you have to connect your slot to the signal of the button as well...and as he states above, make a public function in your widget class returns the push button text.

Your missing in your constructor...or wherever fits:
@
connect(ui->button, SIGNAL(clicked()), this, SLOT(on_pushButton_2_clicked()));
@

And in your class public function that is located in your 'promoted' class:
@
QString Widget::getButtonText()
{
return ui->pushButton->text();
}
@

sidharth

thankyou sir for your reply.
but still i am facing problem.i added the above codes in my MyWidget class and getting error that ui is undeclared.
i am doing it like this:
@#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QtGui>

namespace Ui {
class MainWindow;
}

class MyWidget : public QWidget
{
Q_OBJECT

public:
MyWidget(QWidget *parent = 0);
void paintEvent(QPaintEvent *);

 void drawship(QPainter &paint);
 bool m_flag ;

QString getButtonText();

private:

};

class MainWindow : public QMainWindow
{
Q_OBJECT

public:
bool m_flag ;
void lineedit();
MainWindow(QWidget *parent = 0);
Ui::MainWindow *ui;
~MainWindow();

private slots:
void on_pushButton_2_clicked();

private:

MyWidget *wid;

};

#endif // MAINWINDOW_H@

.cpp

@#include "mainwindow.h"
#include "ui_mainwindow.h"
#include<QPainter.h>
#include<QPen>
#include<math.h>
#include<QTimer>
#include<QMouseEvent>
#include<QPointF>
#include<QLayout>

int w=530;// width of the ploting window
int h=570;//hieght of the plotting window
int Y ; //y coordinates of the ship
int X ; //x coordinates of the ship

MyWidget::MyWidget(QWidget *parent):
QWidget(parent)
{
}

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
m_flag=false;

connect(ui->pushButton_2, SIGNAL(clicked()), this, SLOT(on_pushButton_2_clicked()));
ui->setupUi(this);
wid = ui->widget;

}

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

void MyWidget ::paintEvent(QPaintEvent *)
{

// dimensions of plotting window
int x=0;
int y=0;
int w=530;
int h=570;

QPainter painter(this);
painter.drawRect(x,y,w,h);

QPainter paint(this);

// setting coordinates system of plotting window
paint.setViewport(x,y,w,h);
paint.setWindow(-w/2,-h/2,w,h);
paint.scale(1,-1);

paint.setPen(Qt::blue);
drawship(paint);
}

void MainWindow::lineedit()
{

if(m_flag==true)

{
QString px,py,pz;
px=ui->lineEdit->text();

  X=px.toInt();

  py=ui->lineEdit_2->text();
  Y= py.toInt();

}
}

void MyWidget::drawship(QPainter &paint)
{
paint.drawRect(X,Y,50,40);
update();

}
QString MyWidget::getButtonText()
{
return ui->pushButton_2->text();
}

void MainWindow::on_pushButton_2_clicked()
{
m_flag = true;
update();
}
@
please tell me where i am getting wrong