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  4. how to highlight selected text in QTextEdit?
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how to highlight selected text in QTextEdit?

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  • chaochaoC Offline
    chaochaoC Offline
    chaochao
    wrote on last edited by
    #1

    I has realised a small app like NoteBook.Now,I want to hight selected text,but I have no idea about this. I create a class that inheit QSyntaxHighlighter.

    //your code here
    .h
    class Myhighlitghter : public QSyntaxHighlighter
    {
    public:
        explicit Myhighlitghter(QTextDocument *parent=0);
    protected:
         virtual void highlightBlock(const QString &text);
    };
    .cpp
    Myhighlitghter::Myhighlitghter(QTextDocument *parent)
        :QSyntaxHighlighter(parent)
    {
    
    }
    
    void Myhighlitghter::highlightBlock(const QString &text)
    {
        QTextCharFormat charformat;
        charformat.setFontWeight(QFont::Bold);
        charformat.setForeground(Qt::red);
    
        QString pattern="\\bchar\\b";
    
        QRegExp exp(pattern);
    
        int index = text.indexOf(exp);
    
        while(index>=0)
        {
            int len=exp.matchedLength();
    
            setFormat(index,len,charformat);
    
            index = text.indexOf(exp,index+len);
        }
    }
    

    then I create a mainwindow that has Qtextedit and Myhighlitghter object.Now , I want to select text in textedit and hightlight them.

    thank for your help

    Ni.SumiN 1 Reply Last reply
    0
    • chaochaoC chaochao

      I has realised a small app like NoteBook.Now,I want to hight selected text,but I have no idea about this. I create a class that inheit QSyntaxHighlighter.

      //your code here
      .h
      class Myhighlitghter : public QSyntaxHighlighter
      {
      public:
          explicit Myhighlitghter(QTextDocument *parent=0);
      protected:
           virtual void highlightBlock(const QString &text);
      };
      .cpp
      Myhighlitghter::Myhighlitghter(QTextDocument *parent)
          :QSyntaxHighlighter(parent)
      {
      
      }
      
      void Myhighlitghter::highlightBlock(const QString &text)
      {
          QTextCharFormat charformat;
          charformat.setFontWeight(QFont::Bold);
          charformat.setForeground(Qt::red);
      
          QString pattern="\\bchar\\b";
      
          QRegExp exp(pattern);
      
          int index = text.indexOf(exp);
      
          while(index>=0)
          {
              int len=exp.matchedLength();
      
              setFormat(index,len,charformat);
      
              index = text.indexOf(exp,index+len);
          }
      }
      

      then I create a mainwindow that has Qtextedit and Myhighlitghter object.Now , I want to select text in textedit and hightlight them.

      thank for your help

      Ni.SumiN Offline
      Ni.SumiN Offline
      Ni.Sumi
      wrote on last edited by
      #2

      @chaochao

      QTextCursor will help you to select the text, delete , replace, background color of the selected text.

      chaochaoC 1 Reply Last reply
      1
      • Ni.SumiN Ni.Sumi

        @chaochao

        QTextCursor will help you to select the text, delete , replace, background color of the selected text.

        chaochaoC Offline
        chaochaoC Offline
        chaochao
        wrote on last edited by
        #3

        @Ni.Sumi very thanks, I will have a try

        1 Reply Last reply
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