手动写QT界面实例 不依赖ui文件

例子是个小技术本

例子*********************************************************mainwindow.h

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include <QMainWindow>

#include <QMenu>

#include <QMenuBar>

#include <QTextEdit>

/*

namespace Ui {

class MainWindow;

}

*/

class MainWindow : public QMainWindow

{

    Q_OBJECT

public:

    explicit MainWindow(QWidget *parent = 0);

    ~MainWindow();

    void setupUi();

private:

    QString m_filePath;

    QMenuBar *m_menuBar;

    QMenu *m_fileMenu;

    QTextEdit *textEdit;

    //Ui::MainWindow *ui;

public slots:

    void openFileSlot();

    void saveFileSlot();

    void newFileSlot();

    bool saveAsSlot();

};

#endif // MAINWINDOW_H

****************************************************************mainwindow.cpp

#include "mainwindow.h"

#include <QMenuBar>

#include <QHBoxLayout>

#include <QVBoxLayout>

#include <QFileDialog>

#include <QDebug>

#include "GLDTypes.h"

#include <QMessageBox>

MainWindow::MainWindow(QWidget *parent) :

    QMainWindow(parent)

{

    setupUi();

}

void MainWindow::setupUi()

{

    this->resize(600,600);

    m_fileMenu = new QMenu("&File(F)",this);

    //向menu中加入Action

    QAction *newFile = new QAction("&New File",this);

    newFile->setShortcut(QKeySequence(Qt::CTRL + Qt::Key_N));//给action 设置快捷键

    m_fileMenu->addAction(newFile);

    QAction *openFile = new QAction("&Open File",this);

    openFile->setShortcut(QKeySequence(Qt::CTRL + Qt::Key_O));//给action 设置快捷键

    m_fileMenu->addAction(openFile);

    QAction *saveFile = new QAction("&Save File",this);

    saveFile->setShortcut(QKeySequence(Qt::CTRL + Qt::Key_S));//给action 设置快捷键

    m_fileMenu->addAction(saveFile);

    QAction *saveFileAs = new QAction("&Save File A",this);

    saveFileAs->setShortcut(QKeySequence(Qt::CTRL + Qt::Key_S));//给action 设置快捷键

    m_fileMenu->addAction(saveFileAs);

    //向menuBar中加入Menu

    m_menuBar = menuBar();

    m_menuBar->addMenu(m_fileMenu);

    //向menuBar中直接加入Action

    m_menuBar->addAction(new QAction("Close File",this));

    connect(newFile,&QAction::triggered,this,&MainWindow::newFileSlot);

    connect(openFile,&QAction::triggered,this,&MainWindow::openFileSlot);

    connect(saveFile,&QAction::triggered,this,&MainWindow::saveFileSlot);

    connect(saveFileAs,&QAction::triggered,this,&MainWindow::saveAsSlot);

    //new一个水平布局，在水平居中加入一个textedit

    QHBoxLayout *mainHbox = new QHBoxLayout(this);

    textEdit = new QTextEdit(this);

    mainHbox->addWidget(textEdit);

    //新建一个widget

    QWidget *widget = new QWidget(this);

    //将水平布局加入到widget中

    widget->setLayout(mainHbox);

    //设置中心窗体为widget

    setCentralWidget(widget);

}

void MainWindow::openFileSlot()

{

    QString filePath = QFileDialog::getOpenFileName(

                this, tr("Open File"), "", tr("File (*.txt)"));

    //ui->filePathLineEdit->setText(filePath);

    m_filePath=filePath;

    QFile file(filePath);

    file.open(QIODevice::ReadOnly | QIODevice::Text);//以只读方式打开文件

    QTextStream in(&file);

    //in.setCodec("UTF-8");

    QString content = in.readAll();

    textEdit->setPlainText(content);

    //设置标题

    QFileInfo fi(filePath);

    QString name=fi.fileName();

    this->setWindowTitle(tr("%1[*]").arg(name));

    file.close();

}

void MainWindow::saveFileSlot()

{

    QString content;

    content = textEdit->toPlainText();

    QFile file(m_filePath);

    file.open(QIODevice::WriteOnly);

    file.write(content.toLocal8Bit());

    //QTextStream writefiletext(&file);

    //content = QString::fromLocal8Bit(content);

    //writefiletext<<content.toLocal8Bit();

    file.close();

    qDebug()<<content;

}

void MainWindow::newFileSlot()

{

    QTextDocument *document=textEdit->document();

    int ret=QMessageBox::question(this, "Save?",

                                  "disSave, Save",

                                  QMessageBox::Save | QMessageBox::Discard | QMessageBox::Cancel);

    switch(ret)

    {

    case QMessageBox::Cancel:

        break;

    case QMessageBox::Discard:

        textEdit->setText("");

        this->setWindowTitle(tr("%1[*]").arg(""));

        break;

    case QMessageBox::Save:

        textEdit->setText("");

        this->setWindowTitle(tr("%1[*]").arg(""));

        break;

    }

}

bool MainWindow::saveAsSlot()

{

    QString fileName = QFileDialog::getSaveFileName(this,"as file");

    if(fileName.isEmpty())

       {

        return false;

    }

    QString content;

    content = textEdit->toPlainText();

    QFile file(fileName);

    file.open(QIODevice::WriteOnly);

    file.write(content.toLocal8Bit());

    file.close();

    return true;

}

MainWindow::~MainWindow()

{

    //delete ui;

}