QT普通文本编辑

1在mainwindow.h中加入

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include <QMainWindow>

#include <QDebug>

#include <QDialog>

#include <QFileDialog>

#include <QWidget>

#include <QImage>

#include <QLabel>

#include <QMenu>

#include <QMenuBar>

#include <QAction>

#include <QPainter>

#include <QtPrintSupport/QPrintDialog>

#include <QtPrintSupport/QPrinter>

#include <QPrinter>

#include <QPrintDialog>

#include <QT>

#include <QImage>

#include <QSize>

#include <Qt>

#include <QCoreApplication>

#include <QApplication>

#include <QClipboard>

#include <QTextEdit>

namespace Ui {

class MainWindow;

}

class MainWindow : public QMainWindow

{

    Q_OBJECT

public:

    explicit MainWindow(QWidget *parent = 0);

    ~MainWindow();

private:

    Ui::MainWindow *ui;

    QString fileName;

    QImage img;

protected slots:

    void loadFile(QString filename);

    void ShowNewFile();

    void ShowOpenFile();

    void ShowPrintText();

    void ShowPrintImage();

    void ShowZoomIn();

    void ShowZoomOut();

    void ShowRotate90();

    void ShowRotate180();

    void ShowRotate270();

};

#endif // MAINWINDOW_H

//2main.c中

#include "mainwindow.h"

#include <QApplication>

int main(int argc, char *argv[])

{

    QApplication a(argc, argv);

    MainWindow w;

    w.show();

    return a.exec();

}

3mainwindow.c中

#include "mainwindow.h"

#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :

    QMainWindow(parent),

    ui(new Ui::MainWindow)

{

    ui->setupUi(this);

    char img_value=img.load("image.png");

    if(img_value)

    {

        ui->label_image->setPixmap(QPixmap::fromImage(img));

    }

    connect(ui->action_new,SIGNAL(triggered()),this,SLOT(ShowNewFile()));

    connect(ui->action_open,SIGNAL(triggered()),this,SLOT(ShowOpenFile()));

    connect(ui->action_print_txt,SIGNAL(triggered()),this,SLOT(ShowPrintText()));

    connect(ui->action_print_picture,SIGNAL(triggered()),this,SLOT(ShowPrintImage()));

    connect(ui->action_quit,SIGNAL(triggered()),qApp, SLOT(quit()));

    connect(ui->action_copy,SIGNAL(triggered()),ui->textEdit,SLOT(copy()));

    connect(ui->action_cut,SIGNAL(triggered()),ui->textEdit,SLOT(cut()));

    connect(ui->action_paste,SIGNAL(triggered()),ui->textEdit,SLOT(paste()));

    connect(ui->action_redo,SIGNAL(triggered()),ui->textEdit,SLOT(redo()));

    connect(ui->action_undo,SIGNAL(triggered()),ui->textEdit,SLOT(undo()));

    connect(ui->action_shrink,SIGNAL(triggered()),this,SLOT(ShowZoomIn()));

    connect(ui->action_enlarge,SIGNAL(triggered()),this,SLOT(ShowZoomOut()));

    connect(ui->action_rotate90,SIGNAL(triggered()),this,SLOT(ShowRotate90()));

    connect(ui->action_rotate180,SIGNAL(triggered()),this,SLOT(ShowRotate180()));

    connect(ui->action_rotate270,SIGNAL(triggered()),this,SLOT(ShowRotate270()));

}

MainWindow::~MainWindow()

{

    delete ui;

}

void MainWindow::loadFile(QString filename)

{

    printf("file name:%s\n",filename);

    QFile file(filename);

    if(file.open(QIODevice::ReadOnly|QIODevice::Text))

    {

        QTextStream textStream(&file);

        while(!textStream.atEnd())

        {

            ui->textEdit->append(textStream.readLine());

            printf("read line\n");

        }

        printf("end\n");

    }

}

void MainWindow::ShowNewFile()

{

    qDebug("ok");

    MainWindow *newMainWindow = new MainWindow;

    newMainWindow ->show();

}

void MainWindow::ShowOpenFile()

{

    qDebug("ShowOpenFile");

    fileName = QFileDialog::getOpenFileName(this);

    if(! fileName.isEmpty())

    {

        if(ui->textEdit->document()->isEmpty())

        {

            qDebug("ShowOpenfile1");

            loadFile(fileName);

        }

        else

        {

            MainWindow *newMainWindow = new MainWindow;

            newMainWindow ->show();

            newMainWindow->loadFile(fileName);

        }

    }

}

void MainWindow::ShowPrintText()

{

    qDebug("ShowPrintText()");

    QPrinter printer;

    QPrintDialog printeDialog(&printer,this);

    if(printeDialog.exec())

    {

        QTextDocument *doc = ui->textEdit->document();

        doc->print(&printer);

    }

}

void MainWindow::ShowPrintImage()

{

    QPrinter printer;

    QPrintDialog printDialog(&printer,this);

    if(printDialog.exec())

    {

        QPainter painter(&printer);

        QRect rect = painter.viewport();

        QSize size = img.size();

        size.scale(rect.size(),Qt::KeepAspectRatio);

        painter.setViewport(rect.x(),rect.y(),size.width(),size.height());

        painter.setWindow(img.rect());

        painter.drawImage(0,0,img);

    }

}

void MainWindow::ShowZoomIn()

{

    if(img.isNull()) return;

    QMatrix matrix;

    matrix.scale(0.5,0.5);

    img = img.transformed(matrix);

    ui->label_image->setPixmap(QPixmap::fromImage(img));

}

void MainWindow::ShowZoomOut()

{

    if(img.isNull()) return;

    QMatrix matrix;

    matrix.scale(2,2);

    img = img.transformed(matrix);

    ui->label_image->setPixmap(QPixmap::fromImage(img));

}

void MainWindow::ShowRotate90()

{

    if(img.isNull()) return;

    QMatrix matrix;

    matrix.rotate(90);

    img = img.transformed(matrix);

    ui->label_image->setPixmap(QPixmap::fromImage(img));

}

void MainWindow::ShowRotate180()

{

    if(img.isNull()) return;

    QMatrix matrix;

    matrix.rotate(180);

    img = img.transformed(matrix);

    ui->label_image->setPixmap(QPixmap::fromImage(img));

}

void MainWindow::ShowRotate270()

{

    if(img.isNull()) return;

    QMatrix matrix;

    matrix.rotate(270);

    img = img.transformed(matrix);

    ui->label_image->setPixmap(QPixmap::fromImage(img));

}