Solved

sidharth

i have a Qtablewidget in forms and i want to add data dynamically in the rows and columns.i have a timer and i am incrementing value of a variable after every 1 second. so i want that after everyone second my value should generate in table and when after 1 second my second value comes ,my first value should shift in second row and so on...
lyk this:

@#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QGroupbox>
#include <QPainter>
#include <QPen>
#include <QTimer>
#include <QTime>
int r=0;
int c=0;
int b=0;
QString textstr;
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent), ui(new Ui::MainWindow)
{
ui->setupUi(this);

 QTimer *timer = new QTimer(this);

  timer->start(1000);


 connect(timer, SIGNAL(timeout()), this, SLOT(time()));

}

MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow :: paintEvent(QPaintEvent *)
{

 QVariant v( b);

  textstr=v.toString();

 //QPainter p(this);

 // p.drawText(10,50,textstr);

for(r=0;r<1;r++)
{
for(c=0;c<1;c++)
{

       QTableWidgetItem *item = new QTableWidgetItem();
        item->setText(textstr);
        ui->tableWidget->setItem(r,c,item);
    }

}

void MainWindow :: time()
{
b++;

update();

}@

i want that everytime my new value comes ,a new row is created.

so please help me out by changing this code.

qxoz

Hi sidharth!
First of all use code tags "@" for posting code parts.
For adding rows to QTableWidget you not need use paintEvent just do it in time() slot
@ui->tableWidget->setRowCount(ui->tableWidget->rowCount() + 1);

QTableWidgetItem* item = new QTableWidgetItem;
item->setText(QString::number(b));
ui->tableWidget->setItem(ui->tableWidget->rowCount() - 1, 0, item);@

look at "QTableWidget":http://qt-project.org/doc/qt-5.0/qtwidgets/qtablewidget.html

qxoz

However, i'd recommend you use QTableView with QStandardItemModel instead QTableWidget.

sidharth

thankyou sir,
i got your code but it is generating rows and data but it is generating in a order 0123..........
i want that if my first value is 1 in row1 then when my second value ie 2 comes my first value gets shift to row 2 and the when my third value ie 3 comes my previous value shifts in lower row...
i mean to say everytime my new value should appear in row1...
plz help me out with edition in the same code...

thankyou once again

qxoz

Ok, try this:
@ui->tableWidget->insertRow(0);
QTableWidgetItem* item = new QTableWidgetItem;
item->setText(QString::number(b));
ui->tableWidget->setItem(0, 0, item);@

sidharth

thanks alot sir..ur code worked for me.but my format of generating data is like it is generating every number many times...

2
2
2
2
1
1
1
1
1
0
0
0
0
0

like this .why it is hapening can you tell me sir..?

qxoz

Because you have two loops one inside another.
@for(r=0;r<1;r++) {
for(c=0;c<1;c++) {
QTableWidgetItem *item = new QTableWidgetItem();
item->setText(textstr);
ui->tableWidget->setItem(r,c,item);
}
}@

Can you show what you expect at output? Then i can direct you to right way.

ps - and please edit your firs post, add code tags.

sidharth

i added tags and thanx for telling me.
after your first reply i deleted my loops and right now i am not using any for loops.

i exactly want like this
i am drawing my desired output table.

 value

5
4
3 3
4 2
5 1
6 0

like this i want to update my every new value in row1 and previous values will slide down.
i am sending you my whole code
.header
@
#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QtGui/QMainWindow>

namespace Ui
{
class MainWindow;
}

class MainWindow : public QMainWindow
{
Q_OBJECT

public:
void paintEvent(QPaintEvent *);

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

private:
Ui::MainWindow *ui;
private slots:
void time();
};

#endif // MAINWINDOW_H
@

.cpp

@
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QGroupbox>
#include <QPainter>
#include <QPen>
#include <QTimer>
#include <QTime>
int r=0;
int c=0;
int b=0;
QString textstr;
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent), ui(new Ui::MainWindow)
{
ui->setupUi(this);

 QTimer *timer = new QTimer(this);

  timer->start(1000);


 connect(timer, SIGNAL(timeout()), this, SLOT(time()));

}

MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow :: paintEvent(QPaintEvent *)
{

ui->tableWidget->insertRow(0);
QTableWidgetItem* item = new QTableWidgetItem;
item->setText(QString::number(b));
ui->tableWidget->setItem(0, 0, item);

item->setForeground(QColor::fromRgb(0,128,0));

}

void MainWindow :: time()
{

b++;

update();

}
@

sidharth

mean to say like for row1 value5,then row 2 value 4 ..my column name is value..like this everytime my new value comes it will be in row 1 and previous will be sliding down the rows.

you can check my code what i tried and please tell me the solution .you have already done 90% .just a small issue is coming that my every value is generating many times.

qxoz

Try this:
@#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QtGui/QMainWindow>

namespace Ui
{
class MainWindow;
}
class QTimer;
class MainWindow : public QMainWindow
{
Q_OBJECT

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

private:
Ui::MainWindow *ui;
int b;
QTimer *timer
private slots:
void on_timeout();

};

#endif // MAINWINDOW_H@

@#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QTimer>

MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent), ui(new Ui::MainWindow)
{
ui->setupUi(this);
b = 0;
timer = new QTimer(this);
timer->start(1000);
connect(timer, SIGNAL(timeout()), this, SLOT(on_timeout()));
}

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

void MainWindow :: on_timeout()
{
b++;
ui->tableWidget->insertRow(0);
QTableWidgetItem* item = new QTableWidgetItem;
item->setText(QString::number(b));
ui->tableWidget->setItem(0, 0, item);
item->setForeground(QColor::fromRgb(0,128,0));
}@

sidharth

thanx a lot sir for giving me your valuable time.you finally did it what i wanted.
one more question i have to ask.
can you tell me what was wrong with the previous code and what exactly insertrow(0); do..?

qxoz

Generally what i did, is remove paintEvent. As i wrote before "post":https://qt-project.org/forums/viewreply/128236/ and few other changes, you can see it by comparing code texts.
About insert row you can read in "doc":http://qt-project.org/doc/qt-5.0/qtwidgets/qtablewidget.html it just adds an empty row into the table at given position, if there was a row, existing row moves down.

sidharth

ok sir,got it .thankyou again for your help.give me your mail address also please.

qxoz

You're welcome.
Please mark thread as solved (edit first post and add to title [SOLVED] text).
You can send messages to mail address of members from this site. Just go to a members profile, there you will find send email link.

sidharth

sir please tell me that if i want to generate this data in all of my 4 columns then i am applying for loop
@for(c=0;c<4;c++)@ and then @setItem(0,c,item)@.
but its not working what is the problem i am facing..?

sidharth

sir i got the solution..it was @for(c=0;c<0;c=c+1)@

raven-worx

[quote author="sidharth" date="1370587123"]sir i got the solution..it was @for(c=0;c<0;c=c+1)@[/quote]
i doubt that the contents of this loop are ever executed ;)

sidharth

yes sir you are right... :)

can you help me further ?.now i have stuck in some other case.
i have pushbutton in forms created in base class mainwidow .now i have created one widget on the same form by drag and drop and again i created a pushbutton on the class widget.now i want that on the click of my pushbutton which was on the widget,my mainwindow button got disappeared...

how can it be possible.?please help me out

sidharth

i have promoted the widget to class mywidget and done some thing like this

.h
@#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QtGui/QMainWindow>

namespace Ui
{
class MainWindow;
}

class MainWindow : public QMainWindow //class mainwindow
{
Q_OBJECT

public:

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

private:
Ui::MainWindow *ui;

private slots:

};

class mywidget : public QWidget // class mywidget

{
Q_OBJECT

public:

mywidget(QWidget *parent = 0);

public slots:

private:
Ui::MainWindow *ui;

private slots:

void on_pushButton_2_clicked();
};
#endif // MAINWINDOW_H@

.cpp

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

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

}

MainWindow::~MainWindow()
{
delete ui;
}
mywidget::mywidget(QWidget *parent)
: QWidget(parent)

{

}

void mywidget::on_pushButton_2_clicked()
{

}@

tell me how to do it sir ..
please