QTextEdit搜索匹配文本进行高亮

先看下效果：

核心代码：

 

QString search_text = ui->lineEdit->text();
     if (search_text.trimmed().isEmpty()) {
         QMessageBox::information(this, tr("Empty search field"), tr("The search field is empty."));
     } else {
         QTextDocument *document = ui->textEdit->document();
         bool found = false;
         QTextCursor highlight_cursor(document);
         QTextCursor cursor(document);
         //开始
         cursor.beginEditBlock();
         QTextCharFormat color_format(highlight_cursor.charFormat());
         color_format.setForeground(Qt::red);
         while (!highlight_cursor.isNull() && !highlight_cursor.atEnd()) {
             //查找指定的文本，匹配整个单词
             highlight_cursor = document->find(search_text, highlight_cursor, QTextDocument::FindWholeWords);
             if (!highlight_cursor.isNull()) {
                 if(!found)
                     found = true;
                 highlight_cursor.mergeCharFormat(color_format);
             }
         }
         cursor.endEditBlock();
         //结束
         if (found == false) {
             QMessageBox::information(this, tr("Word not found"), tr("Sorry,the word cannot be found."));
         }
     }