【QT】简单文本编辑器，open,save功能

头文件内容

 1 #ifndef MAINWINDOW_H
 2 #define MAINWINDOW_H
 3 
 4 #include <QMainWindow>
 5 #include <QAction>
 6 #include <QMenu>
 7 #include <QToolBar>
 8 #include <QTextEdit>
 9 #include <QFileDialog>
10 #include <QMessageBox>
11 #include <QTextStream>
12 #include <QMenuBar>
13 
14 class MainWindow : public QMainWindow
15 {
16     Q_OBJECT
17 
18 public:
19     MainWindow(QWidget *parent = 0);
20     ~MainWindow();
21 
22 private:
23     QAction *openAction;
24     QAction *saveAction;
25     QTextEdit *textEdit;
26     void saveFile();
27     void openFile();
28 
29 };
30 
31 #endif // MAINWINDOW_H

cpp文件内容

 1 #include "mainwindow.h"
 2 
 3 MainWindow::MainWindow(QWidget *parent)
 4     : QMainWindow(parent)
 5 {
 6     openAction = new QAction(QIcon(":/file"),tr("&Open..."),this);
 7     openAction->setShortcuts(QKeySequence::Open);
 8     openAction->setStatusTip(tr("Open an existing file"));
 9 
10     saveAction = new QAction(QIcon(":/file"),tr("&Save.."),this);
11     saveAction->setShortcuts(QKeySequence::Save);
12     saveAction->setStatusTip(tr("Save a new file"));
13 
14     QMenu *file = menuBar()->addMenu(tr("&File"));
15     file->addAction(openAction);
16     file->addAction(saveAction);
17 
18     QToolBar *toolBar = addToolBar(tr("&File"));
19     toolBar->addAction(openAction);
20     toolBar->addAction(saveAction);
21 
22     textEdit = new QTextEdit(this);
23     setCentralWidget(textEdit);
24 
25     connect(openAction,&QAction::triggered,this,&MainWindow::openFile);
26     connect(saveAction,&QAction::triggered,this,&MainWindow::saveFile);
27 }
28 
29 void MainWindow::openFile()
30 {
31     QString path = QFileDialog::getOpenFileName(this,
32                                                 tr("Open File"),
33                                                 ".",
34                                                 tr("Text Files(*.txt)"));
35     if(!path.isEmpty()){
36         QFile file(path);
37         if(!file.open(QIODevice::ReadOnly | QIODevice::Text)){
38             QMessageBox::warning(this,tr("Read File"),
39                                  tr("Cannot open file:
%1").arg(path));
40             return;
41         }
42         QTextStream in(&file);
43         textEdit->setText(in.readAll());
44         file.close();
45     }else{
46         QMessageBox::warning(this,tr("Path"),
47                              tr("You did not select any file."));
48     }
49 }
50 
51 void MainWindow::saveFile()
52 {
53     QString path = QFileDialog::getSaveFileName(this,
54                                                 tr("Open File"),
55                                                 ".",
56                                                 tr("Text Files(*.txt)"));
57     if(!path.isEmpty()){
58         QFile file(path);
59         if(!file.open(QIODevice::WriteOnly | QIODevice::Text)){
60             QMessageBox::warning(this,tr("Write File"),
61                                  tr("cannot open file:
%1").arg(path));
62             return;
63         }
64         QTextStream out(&file);
65         out << textEdit->toPlainText();
66         file.close();
67     }else{
68         QMessageBox::warning(this,tr("Path"),
69                              tr("You did not select any file."));
70     }
71 }
72 
73 MainWindow::~MainWindow()
74 {
75 
76 }

截图

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原文地址：https://www.cnblogs.com/powercool/p/14442071.html