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QT       += core gui

TARGET = textEditTest
TEMPLATE = app


SOURCES += main.cpp\
        widget.cpp

HEADERS  += widget.h

#include <QtGui/QApplication>
#include "widget.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();

    return a.exec();
}

#include "widget.h"
#include <QPushButton>
#include <QFileDialog>
#include <QTextStream>
#include <QTextEdit>

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    resize(640, 480);

    QTextEdit *te = new QTextEdit(this);
    te->setGeometry(10, 10, 620, 400);
    connect(this, SIGNAL(setHtml(QString)), te, SLOT(setHtml(QString)));

    QPushButton *btn = new QPushButton("Load HTML text", this);
    btn->setGeometry(10, 420, 100, 50);
    connect(btn, SIGNAL(clicked()), this, SLOT(clicked()));
}

void Widget::clicked()
{
    QString FileName = QFileDialog::getOpenFileName(this);
    if (FileName.isEmpty()) return;
    QFile f(FileName);
    if (!f.open(QIODevice::ReadOnly)) return;

    QTextStream ts(&f);
    QString s = ts.readAll();
    f.close();

    emit setHtml(s);
}

#ifndef WIDGET_H
#define WIDGET_H

#include <QtGui/QWidget>

class Widget : public QWidget
{
    Q_OBJECT

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

signals:
    void setHtml(const QString &text);

private slots:
    void clicked();
};

#endif // WIDGET_H