Qt的聊天型多功能文本编辑器

编辑推荐:

本文来自于csdn，本文主要通过长期使用Sublime Text3，用一个项目介绍是如何基于Qt的聊天的，希望对您的学习有帮助。

Qt4.8 + Linux

#ifndef KEYHIGHLIGHT_H
 #define KEYHIGHLIGHT_H
 #include <QSyntaxHighlighter>//高亮库
 #include <QTextCharFormat>//字体格式设置
 #include <QTextDocument>
 #include <QRegExp>//正则表达式
 class Keyhighlight : public QSyntaxHighlighter
 {
 Q_OBJECT
 public:
 Keyhighlight(QTextDocument *parent = 0);
 void highlightBlock(const QString &text);
 private:
 struct HighlightRule
 {
 QRegExp pattern;
 QTextCharFormat format;
 };
 void setNormalFormat();
 void setDigitalFormat();
 void setFuncFormat();
 void setKeywordFormat();
 void setStringFormat();
 void setCommentFormat();
 QVector<HighlightRule> highlightRules;//高亮规则容器
 QRegExp commentStartExpression;
 QRegExp commentEndExpression;
 //由于高亮设置会依次覆盖前面的 所以越后面优先级越高
 QTextCharFormat normalFormat;//普通文本
 QTextCharFormat digitalFormat;//数字
 QTextCharFormat functionFormat;//函数
 QTextCharFormat keywordFormat;//数据类型关键字
 QTextCharFormat keywordFormat_two;//流程控制关键字
 QTextCharFormat keywordFormat_three;//include关键字
 QTextCharFormat stringFormat;//字符串
 QTextCharFormat escFormat;//转义字符和占位符
 QTextCharFormat singleLineCommentFormat;//单行注释高亮
 QTextCharFormat multiLineCommentFormat;//多行注释高亮
 };
 #endif // KEYHIGHLIGHT_H
 

#include "keyhighlight.h"

#include<QFont>

#include <QColor>

Keyhighlight::Keyhighlight(QTextDocument *parent)

:QSyntaxHighlighter(parent)

{

setNormalFormat();//高亮的设置会依次覆盖因此越后面的设置优先值越高

setDigitalFormat();

setFuncFormat();

setKeywordFormat();

setStringFormat();

setCommentFormat();

}void Keyhighlight::setNormalFormat()

{

HighlightRule nmrule;//普通文本高亮规则 结构体= pattern + format

QFont nmF("Courier");//字体设置

normalFormat.setFont(nmF);//普通文本格式设置

nmrule.pattern = QRegExp(".+");//正则表达式匹配除\n的所有字符

nmrule.format = normalFormat;

highlightRules.append(nmrule);

}

void Keyhighlight::setDigitalFormat()//数字

{

HighlightRule dgrule;

QFont dgtF("Courier");

digitalFormat.setFont(dgtF);

digitalFormat.setForeground(QColor(128,0,128));//设置颜色为紫色

dgrule.pattern = QRegExp("[0-9]+");//0-9数字正则匹配

dgrule.format = digitalFormat;

highlightRules.append(dgrule);

}

void Keyhighlight::setFuncFormat()//函数名

{

HighlightRule funrule;

QFont funF("Courier");

functionFormat.setFont(funF);

functionFormat.setForeground(QColor(0,255,0));//设置颜色为绿色

funrule.pattern = QRegExp("\\b[A-Za-z0-9_]+(?=\\()");//正则匹配()前的标识符即函数名

funrule.format = functionFormat;

highlightRules.append(funrule);

}

void Keyhighlight::setKeywordFormat()//关键字的正则匹配

{

HighlightRule keyrule;

QFont keyF("Courier");

keywordFormat.setFont(keyF);

keywordFormat.setForeground(QColor(0,191,255));//蓝色

QStringList keywordPatterns;

keywordPatterns << "\\bchar\\b" << "\\bclass\\b" <<

"\\bdouble\\b"

<< "\\benum\\b" << "\\bexplicit\\b"<<

"\\bint\\b"

<< "\\blong\\b" << "\\bshort\\b" << "\\bstruct\\b"

<< "\\btypedef\\b" << "\\btypename\\b"<< "\\bunion\\b"

<< "\\bunsigned\\b" << "\\bvoid\\b"<< "\\bauto\\b"<<"\\btemplate\\b";//数据类型关键字

foreach (const QString &pattern, keywordPatterns)

{

keyrule.pattern = QRegExp(pattern);

keyrule.format = keywordFormat;

highlightRules.append(keyrule);

}

HighlightRule key2rule;

QFont key2F("Courier");

keywordFormat_two.setFont(key2F);

keywordFormat_two.setForeground(QColor(255,0,0));//红色

QStringList keywordPatterns2;

keywordPatterns2 <<"\\bfor\\b"<<"\\bif\\b"<<"\\belse\\b"<<"\\bwhile\\b"

<<"\\bbreak\\b"

<<"\\bcontinue\\b"<<"\\bgoto\\b"<<"\\bswitch\\b"<<"\\

bcase\\b"

<<"\\bdefault\\b"<<"\\breturn\\b"<<"\\bconst\\b"<<"\\

bstatic\\b"

<<"\\bextern\\b"<<"\\bregister\\b"<<"\\bsizeof\\b"<<"

\\bvolatile\\b"

<<"\\bexplicit\\b"<<"\\boperator\\b"<<"\\btypename\\b"

<<"\\bfriend\\b"

<<"\\binline\\b"<<"\\busing\\b"<<"\\bvirtual\\b";

foreach (const QString &pattern, keywordPatterns2)

{

key2rule.pattern = QRegExp(pattern);

key2rule.format = keywordFormat_two;

highlightRules.append(key2rule);

}

HighlightRule key3rule;

QFont key3F("Courier");

keywordFormat_three.setFont(key3F);

keywordFormat_three.setForeground(QColor(255,0,0));

key3rule.pattern = QRegExp("#include\s*");

key3rule.format = keywordFormat_three;

highlightRules.append(key3rule);

}

void Keyhighlight::setStringFormat()//字符串

{

HighlightRule strrule;

QFont strF("Courier");

stringFormat.setFont(strF);

stringFormat.setForeground(QColor(255,140,0));//黄色

//正则匹配两个引号或三角括号之间的字符串

strrule.format = stringFormat;

highlightRules.append(strrule);

}

void Keyhighlight::setCommentFormat()//注释

{

HighlightRule cmtrule;

singleLineCommentFormat.setForeground(QColor(192,192,192));

//灰色

cmtrule.pattern = QRegExp("//[^\n]*");

cmtrule.format = singleLineCommentFormat;

highlightRules.append(cmtrule);

multiLineCommentFormat.setForeground(QColor(192,192,192));

commentStartExpression = QRegExp("/\\*");

//多行注释正则匹配开始字符

commentEndExpression = QRegExp("\\*/");//结束字符

}void Keyhighlight::highlightBlock(const QString &text)//text是单行传入的

{

foreach(const HighlightRule & rule,highlightRules)

{

QRegExp expression(rule.pattern);

int index = expression.indexIn(text);

while(index >= 0)

{

int length = expression.matchedLength();

setFormat(index,length,rule.format);

index = expression.indexIn(text,index+length);

}

}

setCurrentBlockState(0);

int startIndex = 0;

if (previousBlockState() != 1)

startIndex = commentStartExpression.indexIn(text);

while (startIndex >= 0)

{

int endIndex = commentEndExpression.indexIn(text, startIndex);

int commentLength;

if (endIndex == -1)

{

setCurrentBlockState(1);

commentLength = text.length() - startIndex;

}

else

{

commentLength = endIndex - startIndex + commentEndExpression.matchedLength();

}

setFormat(startIndex, commentLength, multiLineCommentFormat);

startIndex = commentStartExpression.indexIn(text, startIndex + commentLength);

}

}

void MainWindow::onBuild()
 {
 onSaveFile();//先保存文件
 if("" == getOpenFilePath()) return;//如果仍然不保存则直接返回
 QProcess *p = new QProcess;//创建进程执行外部程序
 QStringList arg1;
 arg1 << getOpenFilePath();
 arg1 << "-std=gnu99";
 p->start("gcc",arg1/*QStringList() << getOpenFilePath()*/);//gcc filename
 p->waitForFinished();//等待结束
 QString s = QString::fromLocal8Bit((p->readAllStandardError()));//从本地字符集GB到Unicode的转换，获取错误信息
 if(s == "")//如果错误信息为空则说明没有错
 {
 QProcess *p2 = new QProcess;//创建进程执行./a.out
 p2->start("./a.out");
 p2->waitForFinished();
 s += QString::fromLocal8Bit(p2->readAllStandardOutput());
 delete p2;
 }
 QWidget* wd = new QWidget;//新建窗口
 QTextEdit* te = new QTextEdit(wd);//新建文本存放编译结果字符串
 QGridLayout *grid = new QGridLayout;//添加新布局
 grid->addWidget(te,0,0);
 wd->setWindowTitle("编译结果");
 wd->setLayout(grid);//布局
 te->setPlainText(s);//设置文本
 te->show();
 wd->show();
 delete p;
 }