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From: Alex M. on 1 Aug 2010 08:53
{ Qt is not a commercial library, but there might be a better forum
specifically targeted for Qt developers. -mod }


Hi, here's my code, it's a simple widget with Qt. :)

[main.cpp]
_________
#include <QtGui/QApplication>
#include "widget.h"

int main(int argc, char *argv[])
{
QApplication a(argc, argv);

Widget W(250,200);

return a.exec();
}
_________

[widget.h]
_________
#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QPushButton>
#include <QLabel>
#include <QTextEdit>

class Widget : public QWidget{
private:
QTextEdit *t;

public slots:
void clearText(QTextEdit *t);

public:
Widget(int, int);
};

class widget : public QWidget{
public:
QPushButton *b;
QLabel *l;
widget(Widget *parent);
};

#endif // WIDGET_H
_________

[widget.cpp]
_________
#include <widget.h>
#include <QHBoxLayout>
#include <QVBoxLayout>

Widget::Widget(int a, int b){

widget *w = new widget(this);

t = new QTextEdit(this);
QVBoxLayout *qv = new QVBoxLayout;

qv->addWidget(t);
qv->addWidget(w);

connect(w->b, SIGNAL(clicked()), t, SLOT(clearText(t))); //
clears the content of t
connect(w->b, SIGNAL(clicked()), t, SLOT(setFocus())); //sets
focus to t

setLayout(qv);
setFixedSize(a, b);
setWindowTitle("QuickTweet");
show();
};

void Widget::clearText(QTextEdit *t){
t->clear();
}

widget::widget(Widget *parent){
b = new QPushButton(tr("Clear"), this);
l = new QLabel(tr("160 characters remaining"));

QHBoxLayout *ql = new QHBoxLayout;
ql->addWidget(l);
ql->addWidget(b);

setLayout(ql);
show();
};
_________

When I build this and press the "Clear" button the t [QTextEdit] won't
clear. :) What have I done wrong?

--
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From: Javi on 4 Aug 2010 04:18
> qv->addWidget(t);
> qv->addWidget(w);
>
> connect(w->b, SIGNAL(clicked()), t, SLOT(clearText(t))); //
> clears the content of t
> connect(w->b, SIGNAL(clicked()), t, SLOT(setFocus())); //sets
> focus to t
>

Which version of Qt are you using? I would try this:

connect(w->b, SIGNAL(clicked()), t, SLOT(clear())); // clears the
content of t


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