[Qt练习]textReader QTextEdit 和 QFileDailog

textreader.h

#ifndef TXTREADER_H
#define TXTREADER_H
#include <QWidget>

class QTextEdit;
class QPushButton;
class TxtReader : public QWidget
{
    Q_OBJECT
public:
    TxtReader(QWidget *parent = 0);
protected slots:
    void readTxtFile();
protected:
    QTextEdit *txtEdit;
    QPushButton *openBtn;
};

#endif // TXTREADER_H

textreader.htextreader.cpp

#include "txtreader.h"
#include <QVBoxLayout>
#include <QTextEdit>
#include <QPushButton>
#include <QFont>
#include <QFileDialog>
#include <QFile>
#include <QTextStream>

TxtReader::TxtReader(QWidget *parent):QWidget(parent)
{
    txtEdit = new QTextEdit;
    txtEdit->setFont(QFont("Courier",12, QFont::Bold));
    openBtn = new QPushButton("Open Text File");
    QVBoxLayout *layout = new QVBoxLayout;
    layout->addWidget(txtEdit);
    layout->addWidget(openBtn);
    setLayout(layout);
    resize(500,400);
    connect(openBtn, SIGNAL(clicked()), this, SLOT(readTxtFile()));
}

void TxtReader::readTxtFile()
{
    QString fileName = QFileDialog::getOpenFileName(this, "open text file", "",
                                                    "Text files(*.txt *.java *.h);;ALL file(*.*)");
    QFile file(fileName);
    if(file.open(QIODevice::ReadOnly))
    {
        this->setWindowTitle(fileName);
        QTextStream stream(&file);
        txtEdit->setText(stream.readAll());
    }
}

main.cpp

#include <QApplication>
#include "txtreader.h"
int main(int argc, char**argv)
{
    QApplication app(argc, argv);
    TxtReader *reader = new TxtReader;
    reader->show();
    return app.exec();
}

 

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