QT实现文本编辑器

一用Qt4实现的文本编辑器

1. 新建，打开，保存文件

2.基本的文本编辑功能（复制，粘贴，剪切等)

3.不同风格

4.改变文字的大小，颜色，字体等

界面如下：

二工程文件

1. /* src.pro*/

TEMPLATE = app

CONFIG += warn_on \

thread \

qt \

qtestlib

TARGET = texteditor

DESTDIR = ../bin

SOURCES += CMainWindow.cpp \

MainWindow.cpp \

CFindDialog.cpp

HEADERS += CFindDialog.h \

CMainWindow.h \

ui_finddialog.h \

ui_MainWindow.h

FORMS += FindDialog.ui \

MainWindow.ui

RESOURCES += MainWindow.qrc

QT += qt3support

2. /*CMainWindow.cpp*/

#include "CMainWindow.h"

#include "CFindDialog.h"

#include

#include

CMainWindow::CMainWindow(QWidget *parent)

: QMainWindow(parent)

{

setupUi(this);

iniStatusBar();

iniConnect();

fontColorAct = new QAction(QPixmap(32, 32), tr("改变字体颜色"), this);

styleToolBar = new QToolBar(this);

styleToolBar->setObjectName(QString::fromUtf8("styleToolBar"));

styleToolBar->setOrientation(Qt::Horizontal);

this->addToolBar(Qt::TopToolBarArea, styleToolBar);

menu_2->addAction(fontColorAct);

styleToolBar->addAction(fontColorAct);

show();

connect(fontColorAct, SIGNAL(triggered()), this, SLOT(changeColor())); }

void CMainWindow::iniConnect()

{

connect(textEdit, SIGNAL(cursorPositionChanged()),

this, SLOT(doCursorChanged()));

connect(textEdit->document(), SIGNAL(contentsChanged()),

this, SLOT(doModified()));

connect(actionAbout, SIGNAL(triggered()), this, SLOT(doAbout()));

connect(actionHelp, SIGNAL(triggered()), this, SLOT(doHelp()));

connect(actionQuit, SIGNAL(triggered()), this, SLOT(doQuit()));

connect(actionOpen, SIGNAL(triggered()), this, SLOT(doOpen()));

connect(actionAll, SIGNAL(triggered()), this, SLOT(doAll()));

connect(actionASave, SIGNAL(triggered()), this, SLOT(doASave()));

connect(actionClose, SIGNAL(triggered()), this, SLOT(doClose()));

connect(actionCopy, SIGNAL(triggered()), this, SLOT(doCopy()));

connect(actionUndo, SIGNAL(triggered()), this, SLOT(doUndo()));

connect(actionRedo, SIGNAL(triggered()), this, SLOT(doRedo()));

connect(actionSave, SIGNAL(triggered()), this, SLOT(doSave()));

connect(actionFind, SIGNAL(triggered()), this, SLOT(doFind()));

connect(actionNew, SIGNAL(triggered()), this, SLOT(do New()));

connect(actionPaste, SIGNAL(triggered()), this, SLOT(doPaste()));

connect(actionCut, SIGNAL(triggered()), this, SLOT(doCut()));

connect(actionWindows, SIGNAL(triggered()), this, SLOT(doWindows()));

connect(actionWindowsXp, SIGNAL(triggered()), this,

SLOT(doWindowsXp()));

connect(actionCDE, SIGNAL(triggered()), this, SLOT(doCDE()));

connect(actionMotif, SIGNAL(triggered()), this, SLOT(doMotif()));

connect(actionPlastique, SIGNAL(triggered()), this, SLOT(doPlastique()));

connect(actionFont, SIGNAL(triggered()), this, SLOT(doFont()));

}

void CMainWindow::changeColor()

{

QColor color =QColorDialog::getColor(fontColor, this);

if(color.isValid()) {

fontColor = color;

updateColor();

}

textEdit->setTextColor(fontColor);

}

void CMainWindow::doModified()

{

setWindowModified(textEdit->document()->isModified());

label2->setText("正在修改");

}

void CMainWindow::doAbout()

{

QMessageBox::about(this,

"关于",

"TextEditor 1.0\nBy Roc\nJune-15th-2009"); }

void CMainWindow::doHelp()

{

QString info;

QFile file("help.txt");

if (!file.open(QFile::ReadOnly | QFile::Text))

{

QMessageBox::warning(this,

"打开帮助文档",

QString("无法读取帮助文件:\n%1")

.arg(file.errorString()));

return ;

}

else

{

QTextStream in(&file);

QMessageBox box(this);

box.setWindowTitle("帮助");

box.setIcon(QMessageBox::Information);

box.setText("TextEditor简介：");

box.setStandardButtons(QMessageBox::Ok);

box.setDetailedText(in.readAll());

box.exec();

return ;

}

}

void CMainWindow::iniStatusBar()

label1 = new QLabel;

label1->setMinimumSize(200, 25);

label1->setFrameShadow(QFrame::Sunken);

label1->setFrameShape(QFrame::WinPanel);

label2 = new QLabel;

label2->setMinimumSize(200, 25);

label2->setFrameShadow(QFrame::Sunken);

label2->setFrameShape(QFrame::WinPanel);

statusbar->addWidget(label1);

statusbar->addWidget(label2);

}

void CMainWindow::doASave()

{

QString filename =

QFileDialog::getSaveFileName(this,

"另存为", currentFile, "text files *.txt");

if (!filename.isEmpty())

{

saveFile(filename);

}

}

void CMainWindow::doCut()

{

textEdit->cut();

}

void CMainWindow::doCopy()

{

textEdit->copy();

}

void CMainWindow::doClose()

{

maybeSave();

textEdit->setVisible(false);

void CMainWindow::doNew()

{

maybeSave();

isUntited = true;

currentFile = "Untited";

setWindowTitle(currentFile + "[*]");

textEdit->clear();

textEdit->setVisible(true);

setWindowModified(false);

}

void CMainWindow::doOpen()

{

QString fileName = QFileDialog::getOpenFileName(this, "打开文本", QDir::currentPath(), "text files *.txt");

if (!fileName.isEmpty())

{

maybeSave();

if (loadFile(fileName))

{

label2->setText("已读取");

}

}

textEdit->setVisible(true);

}

void CMainWindow::doUndo()

{

textEdit->undo();

}

void CMainWindow::doRedo()

{

textEdit->redo();

}

void CMainWindow::doPaste()

{

textEdit->paste();

}

void CMainWindow::doAll()

{

textEdit->selectAll();

}

void CMainWindow::doSave()

{

if (isUntited)

{

doASave();

}

else

{

saveFile(currentFile);

}

}

void CMainWindow::doFind()

{

CFindDialog *finddlg = new CFindDialog(0);

finddlg->bolding(textEdit);

finddlg->show();

}

void CMainWindow::doQuit()

{

doClose();

delete textEdit;

textEdit = NULL;

qApp->quit();

}

bool CMainWindow::loadFile(const QString &fileName)

{

QFile file(fileName);

if (!file.open(QFile::ReadOnly | QFile::Text))

{

QMessageBox::warning(this,

"读取文件",

QString("无法读取文件%1:\n%2")

.arg(fileName)

.arg(file.errorString()));

return false;

}

else

{

QTextStream in(&file);

QApplication::setOverrideCursor(Qt::WaitCursor);

textEdit->setText(in.readAll());

QApplication::restoreOverrideCursor();

setCurrentFile(fileName);

return true;

}

}

void CMainWindow::setCurrentFile(const QString &fileName) {

currentFile = QFileInfo(fileName).canonicalFilePath();

isUntited = false;

setWindowTitle(currentFile + "[*]");

textEdit->document()->setModified(false);

setWindowModified(false);

}

bool CMainWindow::saveFile(const QString fileName)

{

QFile file(fileName);

if (!file.open(QFile::WriteOnly | QFile::Text))

{

QMessageBox::warning(this,

"保存文件",

QString("无法保存文件%1:\n%2")

.arg(fileName)

.arg(file.errorString()));

return false;

}

QTextStream out(&file);

QApplication::setOverrideCursor(Qt::WaitCursor);

out<toPlainText();

QApplication::restoreOverrideCursor();

setCurrentFile(fileName);

label2->setText("已保存");

return true;

}

void CMainWindow::doWindows()

{

qApp->setStyle("windows");

}

void CMainWindow::doWindowsXp()

{

qApp->setStyle("windowsxp");

}

void CMainWindow::doMotif()

{

qApp->setStyle("motif");

}

void CMainWindow::doCDE()

{

qApp->setStyle("cde");

}

void CMainWindow::doPlastique()

{

qApp->setStyle("plastique");

}

void CMainWindow::doFont()

{

bool ok;

QFont font = QFontDialog::getFont(&ok,textEdit->font(),this,"字体对话框");

if (ok)

{

textEdit->setFont(font);

}

}

void CMainWindow::maybeSave()

{

if (textEdit->document()->isModified())

{

QMessageBox box;

box.setWindowTitle("警告");

box.setIcon(QMessageBox::Warning);

box.setText("文档未保存，是否保存？");

box.setStandardButtons(QMessageBox::Yes | QMessageBox::No);

if (box.exec() == QMessageBox::Yes)

{

doSave();

}

}

}

void CMainWindow::doCursorChanged()

{

int pageNum = textEdit->document()->pageCount();

const QTextCursor cursor = textEdit->textCursor();

int colNum = cursor.columnNumber();

int rowNum = textEdit->document()->blockCount();

label1->setText(QString("%1页%2行%3列

").arg(pageNum).arg(rowNum).arg(colNum));

}

void CMainWindow::updateColor()

{

QPixmap pixmap(32, 32);

QPainter painter(&pixmap);

painter.fillRect(0, 0, 32, 32, fontColor);

QColor lighter = fontColor.light();

painter.setPen(lighter);

QPoint lightFrame[] = {QPoint(0, 31), QPoint(0, 0), QPoint(31, 0) }; painter.drawPolyline(lightFrame, 3);

painter.setPen(fontColor.dark());

QPoint darkFrame[] = {QPoint(1, 31), QPoint(31, 31), QPoint(31, 1) }; painter.drawPolyline(darkFrame, 3);

painter.end();

fontColorAct->setIcon(pixmap);

}