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QString searchString = ui->lineEdit_2->text(); QTextDocument *document = ui->description->document(); ui->description->setHtml(ui->description->document()->toPlainText()); int number=0; bool found = false; QTextCursor highlightCursor(document); QTextCharFormat plainFormat(highlightCursor.charFormat()); QTextCharFormat colorFormat = plainFormat; colorFormat.setForeground(Qt::red); if(ui->description->toPlainText()==""){ QMessageBox::information(this, tr("description first"), "Sorry, please display the description first!"); } else{ ui->result->setPlainText(""); QString resultstring="搜索结果："; QString laststring; /*while循环体是本代码的关键-——开始——*/ while (!highlightCursor.isNull() && !highlightCursor.atEnd()) { if(ui->daxiaocheckBox->isChecked()==true){ highlightCursor = document->find(searchString, highlightCursor,QTextDocument::FindCaseSensitively); }//这个是实现大小写区分效果的代码，你可能不需要 else highlightCursor = document->find(searchString, highlightCursor); if (!highlightCursor.isNull()) { number++; found = true; highlightCursor.movePosition(QTextCursor::Right,QTextCursor::KeepAnchor,0); highlightCursor.mergeCharFormat(colorFormat); laststring=QString::number(highlightCursor.position(),10); if(ui->onlyTwo->isChecked()==true){ if(number<=1) resultstring+="n occurrence"+QString::number(number,10)+":—— position:"+QString::number(highlightCursor.position(),10); }//这个是实现大小写区分效果的代码，你可能不需要 else resultstring+="n occurrence"+QString::number(number,10)+":—— position:"+QString::number(highlightCursor.position(),10); } } /*关键代码结束*/ if(number>1&&ui->onlyTwo->isChecked()==true) resultstring+="n occurrence"+QString::number(number,10)+":—— position:"+laststring; ui->result->setPlainText(resultstring); if (found == false) { QMessageBox::information(this, tr("Word Not Found"), "Sorry, the word cannot be found."); } else { QMessageBox::information(this, tr("Word was Found"), "the word '"+searchString+"' was found for "+QString::number(number,10)+((number>1)? " times":" time")); } } |
代码解析将在笔者后续有空闲时间补全,请读者结合自身实际和关键代码分析，以为己用。代码交流，欢迎大家留言
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转载注明原文出处：王柏元的博客>>https://wangbaiyuan.cn/how-to-use-qt-to-find-content-you-want-to-find-a-string-and-tag.html
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