void SecretMainWindow::creatToolBars()
{//=========创建一个【file】工具栏=========//fileToolBar = addToolBar(tr("&File"));fileToolBar->addAction(newAction);fileToolBar->addAction(openAction);fileToolBar->addSeparator();fileToolBar->addAction(saveAction);fileToolBar->addAction(saveAsAction);
}

方法与建立【file】菜单类似。需要在头文件里建立一个工具栏的变量

QToolBar* fileToolBar;

其余创建过程与【file】菜单是一致的。

//=========创建一个【font】工具栏=========//fontToolBar = addToolBar(tr("&Font"));fontstyleLabel = new QLabel(tr("FontType:"));fontBox = new QFontComboBox;fontBox->setFontFilters(QFontComboBox::ScalableFonts);fontToolBar->addWidget(fontstyleLabel);fontToolBar->addWidget(fontBox);

fontToolBar = addToolBar(tr("&Font"));

在工具栏上添加一个设置字体的工具栏

fontstyleLabel = new QLabel(tr("FontType:"));

新建一个标签：【FontType】

fontBox = new QFontComboBox;

新建一个字体下拉框

fontBox->setFontFilters(QFontComboBox::ScalableFonts);

把字体添加到下拉框

fontToolBar->addWidget(fontstyleLabel);fontToolBar->addWidget(fontBox);

把标签和下拉框添加到工具栏上

• 更新状态栏

void SecretMainWindow::creatStatusBar()
{locationLabel = new QLabel;locationLabel->setAlignment(Qt::AlignHCenter);locationLabel->setMinimumSize(locationLabel->sizeHint());statusBar()->addWidget(locationLabel);connect(textEdit, SIGNAL(cursorPositionChanged()), this, SLOT(updateStatusBar()));updateStatusBar();
}void SecretMainWindow::updateStatusBar()
{locationLabel->setText(tr("%1 row  %2 col").arg(textEdit->document()->blockCount()).arg(textEdit->textCursor().columnNumber()));
}

statusBar()->addWidget(locationLabel);

把状态栏标签添加到状态栏上

connect(textEdit, SIGNAL(cursorPositionChanged()), this, SLOT(updateStatusBar()));

当光标位置发生变化的时候，触发更新状态栏

locationLabel->setText(tr("%1 row  %2 col").arg(textEdit->document()->blockCount()).arg(textEdit->textCursor().columnNumber()));

显示出光标的位置，其中1,2分别对应后面的两个参数

• 加密解密

void SecretMainWindow::encrypt()
{//save();//QFile file(currentFile);//QTextStream in(&file);QString text;text.append(textEdit->toPlainText());passwordDlg = new PassWord(this);if(passwordDlg->exec()){if(!passwordDlg->password.isNull())RC4(text, passwordDlg->password);}
}

text.append(textEdit->toPlainText());

获取编辑区的文档内容

passwordDlg = new PassWord(this);

新建一个弹出窗口，输入加密密钥

passwordDlg->exec()

运行弹出窗口

if(!passwordDlg->password.isNull())RC4(text, passwordDlg->password);

确定获取到密钥后，进行RC4加密，参考网上的程序。

void SecretMainWindow::RC4(QString in, QString key)
{int inLen = in.length();unsigned char* sequence;sequence = (unsigned char*)qstrdup(in.toAscii().constData());int keyLen = key.length();unsigned char* cKey;cKey = (unsigned char*)qstrdup(key.toAscii().constData());QString out = "";//Init Sboxchar SBox[128],Key[128];int i, k, j = 0, t;char temp, r;for(i = 0; i < 128; i++)SBox[i] = i;for(k = i = 0; i < 128; i++){Key[i] = cKey[k];k = (k + 1) % keyLen;}for (i = 0; i < 128; i++){j = (j + SBox[i] + Key[i]) % 128;temp = SBox[i];SBox[i] = SBox[j];SBox[j] = temp;}//RC4 Cipheri=0;j=0;for(k = 0; k < inLen; k++){r = sequence[k];i = (i + 1) % 128;j = (j + SBox[i]) % 128;temp = SBox[i];SBox[i] = SBox[j];SBox[j] = temp;t = (SBox[i] + SBox[j]) % 128;r = r ^ SBox[t];//out += QString::number(r, 16);out += QString(QChar(r));//char rr = char(r);//out += QString::fromUtf8(&rr);}textEdit->clear();textEdit->setText(out);delete[] sequence;
}

其中，解密就是加密的逆过程，因此可以用同一个函数解密。

void SecretMainWindow::decipher()
{encrypt();
}

• 弹出密钥输入窗口

创建一个password类。

#ifndef PASSWORD_H
#define PASSWORD_H#include<QDialog>class QLabel;
class QPushButton;
class QLineEdit;class PassWord:public QDialog
{Q_OBJECT
public:PassWord(QWidget* parent = 0);QString password;
private:QLabel* passwordLabel;QLineEdit* passwordLineEdit;QPushButton* okButton;QPushButton* cancelButton;
private slots:void slotOk();void slotCancel();
//signals://getPassword(const QString& password);};
#endif // PASSWORD_H

点击【ok】，获取密码，点击【Cancel】取消操作。

void PassWord::slotOk()
{password = passwordLineEdit->text();//emit getPassword(password);this->accept();
}void PassWord::slotCancel()
{password = QString::null;this->reject();
}

• 效果演示

加密前：