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qt关键字高亮

qt的高亮显示主要是使用qsyntaxhighlighter类,由于qsyntaxhighlighter是抽象基类,所以需要继承并自己实现


//头文件

#ifndef MARKDOWN_HIGHLIGHTER_H
#define MARKDOWN_HIGHLIGHTER_H
#include <QSyntaxHighlighter>
#include <qtextedit.h>
#include <qtextdocument.h>
#include <QTextCharFormat>
#include <qtextcursor.h>
#include <qhash.h>
#include <qvector.h>
#include <qregexp.h>
#include <qcolor.h>
#include <qstring.h>
class markdown_highlighter : public QSyntaxHighlighter
{
public:
    markdown_highlighter(QTextEdit *parent = 0);
    void highlightBlock(const QString &text);
    void SetColorText(const QString &str, const QColor &color);
    void clearRules();
private:
     struct HighlightingRule
      {
          QRegExp pattern;
          QTextCharFormat format;
      };
      QVector<HighlightingRule> highlightingRules;
};
#endif // MARKDOWN_HIGHLIGHTER_H


//cpp文件

#include "markdown_highlighter.h"
markdown_highlighter::markdown_highlighter(QTextEdit *parent)
    : QSyntaxHighlighter(parent)
{
    highlightingRules.clear();
}
void markdown_highlighter::highlightBlock(const QString &text)
{
    foreach (HighlightingRule rule, highlightingRules)
    {
        QRegExp expression(rule.pattern);
        int index = text.indexOf(expression);
        while (index >= 0)
        {
            int length = expression.matchedLength();
            setFormat(index, length, rule.format);
            index = text.indexOf(expression, index + length);
        }
    }
}
void markdown_highlighter::SetColorText(const QString &str, const QColor &color)
{
    HighlightingRule rule;
    rule.pattern = QRegExp(str);
    QTextCharFormat format;
    format.setForeground(color);
    rule.format = format;
    highlightingRules.append(rule);
}
void markdown_highlighter::clearRules()
{
    highlightingRules.clear();
}


然后在你需要高亮的地方即可

    md_high = new markdown_highlighter(ui->textEdit);
    md_high->SetColorText("##",Qt::green);

qt关键字高亮