How to append strings in QText browser by using any loop

[Trojan Arun]

Example :
QStirng ret = "Hello"
for (int i = 0;i<=10;i++)
{
ui->text_browser->append("ret");
//here delay 2sec
}

here after 20sec all 10 prints are displaying, but every 2 sec text browser wasn't append those print.
I am using QT creater 4.5.0 (community)

[Christian Ehrlicher]

You're blocking the Qt Eventloop. Don't block it and use e.g. a QTimer instead.

[Trojan Arun]

How will you stop the timer based on condition?

[Christian Ehrlicher]

@Trojan-Arun said in How to append strings in QText browser by using any loop:

How will you stop the timer based on condition?

By e.g. using a member variable.

[Trojan Arun]

Sorry Ehrlicher i didnt understand.. here i written my sample program.. can u please explain in that.

Ex:
QString ret = "hioooo";
QTimer *timer =new QTimer(this);

ui->textBrowser->setText(ret);
connect(timer, SIGNAL(timeout()),this, SLOT(funct()));
for (int i= 0; i<10;i++)
{

//funct();
ui->textBrowser->setText("inmsde for");
if (i == 10)
{
    //disconnect(timer);

    timer->stop();
    ui->textBrowser->setText("Inside if");
} else {
    ui->textBrowser->setText("Inside else");
    timer->start(1000);
    ui->textBrowser->setText("after else");
}

}

void funct()
{
ui->textBrowser->setText("hello world");
}

[Christian Ehrlicher]

Inside funct() you have to append your new text to your textbrowser widget. Currently you simply set "hello world" there.

[Gojir4]

@Trojan-Arun

//widget.h
#ifndef WIDGET_H
#define WIDGET_H

#include <QTimer>
#include <QWidget>

namespace Ui {
class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT

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

private slots:
    void onTimeout();
    void fill();


private:
    int m_counter = 0;
    QTimer m_timer;
    Ui::Widget *ui;
};

#endif // WIDGET_H

//widget.cpp
#include "widget.h"
#include "ui_widget.h"

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

    ui->textBrowser->setText("Hello");
    connect(&m_timer, &QTimer::timeout, this, &Widget::onTimeout);
    connect(ui->buttonFill, &QPushButton::clicked, this, &Widget::fill);
}

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

void Widget::fill()
{
    //Avoid restarting timer before it have finished previous sequence
    //We could also disable button during the process
    if(m_timer.isActive())
        return;
    m_timer.start(1000);
}
void Widget::onTimeout()
{
    if(m_counter < 10){
        m_counter++;
        ui->textBrowser->append("new line");
    } else {
        m_timer.stop();
        m_counter = 0;
    }
}