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Code: Alles auswählen

#include <QtGui>

int main(int argc, char **argv) {
QApplication app(argc, argv);

QWidget *window = new QWidget;
QLabel *l = new QLabel("Hallo");
QPushButton *button0 = new QPushButton("Label aktualisieren");
QPushButton *button1 = new QPushButton("Beenden");

QVBoxLayout *layout = new QVBoxLayout;
layout->addWidget(l);
layout->addWidget(button0);
layout->addWidget(button1);

window->setLayout(layout);
window->show();


QObject::connect(button0, SIGNAL(clicked()),
				l, SLOT(setText("Anders als vorher")));


QObject::connect(button1, SIGNAL(clicked()),
				&app, SLOT(quit()));
				
return app.exec();
}

Code: Alles auswählen

#include <QApplication>
#include "settext.h"

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    demoKlasse demo;
    return demo.exec();
}

Code: Alles auswählen

#ifndef SETTEXT_H
#define SETTEXT_H

#include <QDialog>

class QDialogButtonBox;
class QLabel;
class QPushButton;

class demoKlasse : public QDialog
{
    Q_OBJECT

public:
    demoKlasse(QWidget *parent = 0);

private:
    QLabel *label;
    QPushButton *button0;
    QPushButton *button1;
    QDialogButtonBox *buttonBox;
    
private slots:
        void setText();
};


#endif

Code: Alles auswählen

#include <QtGui>
#include "settext.h"

demoKlasse::demoKlasse(QWidget *parent): QDialog(parent)
{

    label = new QLabel("alter Text");
    button0 = new QPushButton ("Label aktualisieren");
    button1 = new QPushButton ("Beenden");
    
    buttonBox = new QDialogButtonBox;
    buttonBox->addButton(button0, QDialogButtonBox::ActionRole);
    buttonBox->addButton(button1, QDialogButtonBox::RejectRole);
    
    connect(button0, SIGNAL(clicked()), this, SLOT(setText()));
    connect(button1, SIGNAL(clicked()), this, SLOT(close()));
    
    QVBoxLayout *layout = new QVBoxLayout;
    layout->addWidget(label);
    layout->addWidget(button0);
    layout->addWidget(button1);
    setLayout(layout);
}

void demoKlasse::setText()
{
     label->setText("neuer Text");
}