qt creator 版本6.8.0  MinGW 64bit

由此模块可以扩展成设计一个qt文本编辑器。

界面如下

部分功能展示如下

新建文件

打开文件

mdi模式、级联模式和平铺模式

界面和程序构建过程。

1.如图所需.cpp和.h文件

2.mainwindow.ui和tformdoc.ui界面布局如下

不懂什么是Action如何建立和使用的请看我的另一篇文章。

tformdoc.h和tformdoc.cpp代码如下

#ifndef TFORMDOC_H
#define TFORMDOC_H#include <QWidget>namespace Ui {
class TFormDoc;
}class TFormDoc : public QWidget
{Q_OBJECTpublic:explicit TFormDoc(QWidget *parent = nullptr);~TFormDoc();void loadFromFile(QString &aFileName);QString currentFileName();bool isFileOpen();void saveToFile();void textEditFont();void textCut();void textCopy();void textPaste();
private:Ui::TFormDoc *ui;QString m_fileName;bool m_fileOpened=false;};#endif // TFORMDOC_H/******************************.cpp********************/#include "tformdoc.h"
#include "ui_tformdoc.h"
#include<QFile>
#include<QFileInfo>
#include<QFontDialog>
TFormDoc::TFormDoc(QWidget *parent): QWidget(parent), ui(new Ui::TFormDoc)
{ui->setupUi(this);setWindowTitle("New Doc[*]");setAttribute(Qt::WA_DeleteOnClose);connect(ui->plainTextEdit,&QPlainTextEdit::modificationChanged,this,&TFormDoc::setWindowModified);
}TFormDoc::~TFormDoc()
{delete ui;
}void TFormDoc::loadFromFile(QString &aFileName)
{QFile aFile(aFileName);if(aFile.open(QIODevice::ReadOnly|QIODevice::Text)){QTextStream aStream(&aFile);ui->plainTextEdit->clear();while(!aStream.atEnd()){ui->plainTextEdit->appendPlainText(aStream.readLine());}aFile.close();QFileInfo fileInfo(aFileName);QString str=fileInfo.fileName();setWindowTitle(str+"[*]");m_fileName=str;m_fileOpened=true;}
}QString TFormDoc::currentFileName()
{return m_fileName;
}bool TFormDoc::isFileOpen()
{return m_fileOpened;
}void TFormDoc::saveToFile()
{setWindowModified(false);
}void TFormDoc::textEditFont()
{QFont font;font=ui->plainTextEdit->font();bool ok=false;font= QFontDialog::getFont(&ok,font);if(ok){ui->plainTextEdit->setFont(font);}
}void TFormDoc::textCut()
{ui->plainTextEdit->cut();
}void TFormDoc::textCopy()
{ui->plainTextEdit->copy();
}void TFormDoc::textPaste()
{ui->plainTextEdit->paste();
}

mainwindow.h和mainwindow.cpp代码如下

#ifndef MAINWINDOW_H
#define MAINWINDOW_H#include <QMainWindow>class QMdiSubWindow;
QT_BEGIN_NAMESPACE
namespace Ui {
class MainWindow;
}
QT_END_NAMESPACEclass MainWindow : public QMainWindow
{Q_OBJECTpublic:MainWindow(QWidget *parent = nullptr);~MainWindow();private slots:void on_actDocNew_triggered();void on_actOpen_triggered();void on_actFont_triggered();void on_actCut_triggered();void on_actCopy_triggered();void on_actPaster_triggered();void on_actionViewMode_triggered(bool checked);void on_actTile_triggered();void on_actCascade_triggered();void on_actCloseAll_triggered();void on_actDocSave_triggered();void on_mdiArea_subWindowActivated(QMdiSubWindow *arg1);private:Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H
/***************************************************.cpp*******************************/#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "tformdoc.h"
#include<QMdiSubWindow>
#include<QDir>
#include<QFileDialog>
#include<QMdiSubWindow>
MainWindow::MainWindow(QWidget *parent): QMainWindow(parent), ui(new Ui::MainWindow)
{ui->setupUi(this);setCentralWidget(ui->mdiArea);
}MainWindow::~MainWindow()
{delete ui;
}void MainWindow::on_actDocNew_triggered()
{TFormDoc *tformDoc=new TFormDoc();ui->mdiArea->addSubWindow(tformDoc);tformDoc->show();ui->actCut->setEnabled(true);ui->actCopy->setEnabled(true);ui->actPaster->setEnabled(true);ui->actFont->setEnabled(true);}void MainWindow::on_actOpen_triggered()
{bool newNeed;TFormDoc *tformDoc;if(ui->mdiArea->subWindowList().size()>0){tformDoc=(TFormDoc*)ui->mdiArea->activeSubWindow()->widget();newNeed=tformDoc->isFileOpen();}else{newNeed=true;}QString curPath=QDir::currentPath();QString aFileName=QFileDialog::getOpenFileName(this,"打开一个文件",curPath,"c程序文件(*.h *.cpp);;文本文件(*.txt);;所有文件(*.*)");if(aFileName.isEmpty())return ;if(newNeed){tformDoc=new TFormDoc(this);ui->mdiArea->addSubWindow(tformDoc);}tformDoc->loadFromFile(aFileName);tformDoc->show();ui->actCopy->setEnabled(true);ui->actPaster->setEnabled(true);ui->actCut->setEnabled(true);ui->actFont->setEnabled(true);
}void MainWindow::on_actFont_triggered()
{TFormDoc *tformDoc=(TFormDoc*)ui->mdiArea->activeSubWindow()->widget();tformDoc->textEditFont();
}void MainWindow::on_actCut_triggered()
{TFormDoc *tformDoc=(TFormDoc*)ui->mdiArea->activeSubWindow()->widget();tformDoc->textCut();
}void MainWindow::on_actCopy_triggered()
{TFormDoc *tformDoc=(TFormDoc*)ui->mdiArea->activeSubWindow()->widget();tformDoc->textCopy();
}void MainWindow::on_actPaster_triggered()
{TFormDoc *tformDoc=(TFormDoc*)ui->mdiArea->activeSubWindow()->widget();tformDoc->textPaste();
}void MainWindow::on_actionViewMode_triggered(bool checked)
{if(checked){ui->mdiArea->setViewMode(QMdiArea::TabbedView);}else{ui->mdiArea->setViewMode(QMdiArea::SubWindowView);}ui->mdiArea->setTabsClosable(checked);ui->actCascade->setEnabled(!checked);ui->actTile->setEnabled(!checked);}void MainWindow::on_actTile_triggered()
{ui->mdiArea->tileSubWindows();
}void MainWindow::on_actCascade_triggered()
{ui->mdiArea->cascadeSubWindows();
}void MainWindow::on_actCloseAll_triggered()
{ui->mdiArea->closeAllSubWindows();
}void MainWindow::on_actDocSave_triggered()
{TFormDoc *tformDoc=(TFormDoc*)ui->mdiArea->activeSubWindow()->widget();tformDoc->saveToFile();
}void MainWindow::on_mdiArea_subWindowActivated(QMdiSubWindow *arg1)
{Q_UNUSED(arg1);if(ui->mdiArea->subWindowList().size()==0){ui->actCopy->setEnabled(false);ui->actPaster->setEnabled(false);ui->actCut->setEnabled(false);ui->actFont->setEnabled(false);}}

欢迎大家一起交流。