c++ - 如何在 QScintilla 编辑器小部件中取消选择/取消突出显示选定和突出显示的文本？

Question

我正在尝试编写一个搜索框，其中包含查找/查找上一个/查找下一个以与 QScintilla textEditor 小部件进行交互。因此，我写了一些方法，一个用于突出显示所有匹配的单词然后选择第一次出现，一个用于取消选择/取消突出显示它们。

首先运行 seams 以完成它应该做的，但如果我用另一个关键字重复搜索，旧关键字和新关键字都会显示。

这是我的代码片段:

//
// search & replace:
// do_search_and_replace() - search for matching word
//
void MainWindow::do_search_and_replace(QString action_str)
{
    int line, index;
    qDebug() <<  "do_search_and_replace()";
    // just to be sure...
    if(action_str.isEmpty())
        action_str == "0";

    int action_nr = action_str.toInt();    // convert argument to int, so we can switch() on it...
    text = ui->lineEdit_find->text();
    docText = ui->textEdit->text();
    qDebug() <<  "action_nr: " << action_nr;

    //
    // first part: Mark all occurances of search term
    //
    if (!( text.isEmpty() ))
    {
        qDebug() << text;
        ui->textEdit->SendScintilla(QsciScintillaBase::SCI_INDICSETSTYLE, 0, QsciScintilla::INDIC_FULLBOX);
        ui->textEdit->SendScintilla(QsciScintillaBase::SCI_INDICSETFORE,0, QColor(Qt::darkBlue));


        int end = docText.lastIndexOf(text);
        int cur = -1;

        if(end != -1)
        {
            ui->textEdit->getCursorPosition(&line, &index);
            qDebug() << "line: " << line << " index: " << index;
            while(cur != end)
            {
                cur = docText.indexOf(text,cur+1);
                ui->textEdit->SendScintilla(QsciScintillaBase::SCI_INDICATORFILLRANGE,cur,
                    text.length());
            }
        }
    } // END text.isEmpty(), END mark ALL

    //
    // second part: Find firs occurance of search term
    //
    bool use_regular_expression, is_case_sensitive, match_whole_word_only, use_wrap, search_forward;
    use_regular_expression = false;
    is_case_sensitive = ui->checkBox_CaseSensitive->isChecked();
    match_whole_word_only = ui->checkBox_WholeWords->isChecked();
    use_wrap = true;
    search_forward = ui->radioButton_Forward->isChecked();

    ui->textEdit->SendScintilla(QsciScintillaBase::SCI_INDICSETSTYLE, 0, QsciScintilla::INDIC_FULLBOX);
    //ui->textEdit->SendScintilla(QsciScintillaBase::SCI_INDICSETFORE,0, QColor(Qt::darkBlue));

    bool found = ui->textEdit->findFirst(text, use_regular_expression, is_case_sensitive, match_whole_word_only, use_wrap, search_forward);
    qDebug() <<  "START: found = " << found;
    while(found)
    {
        ui->textEdit->getCursorPosition(&line, &index);

        qDebug() << "line: " << line << " index: " << index;
        qDebug() << text;

        // pattern: found = findFirst(pattern, use_regular_expression, is_case_sensitive, match_whole_word_only, use_wrap, search_forward)
        //found = ui->textEdit->findFirst(text, use_regular_expression, is_case_sensitive, match_whole_word_only, use_wrap, search_forward);

        if(found)
        {
            ui->textEdit->SendScintilla(QsciScintillaBase::SCI_INDICATORFILLRANGE, line, text.length());
            int start = ui->textEdit->positionFromLineIndex(line, index);
            int end = ui->textEdit->positionFromLineIndex(line, index + text.length());
            qDebug() << "line: " << line << " start: " << start << " end: " << end;

//            found = ui->textEdit->findNext();
//            ui->textEdit->SendScintilla(QsciScintillaBase::SCI_INDICATORFILLRANGE, line, text.length());

        }

        found = false;
    }
}


//
// unselect selected stuff
//
void MainWindow::reset_searchResult()
{
    int line, index;
    qDebug() <<  "in: reset_searchResult()";

    //QString text = ui->lineEdit_find->text();
    text.clear();
    docText.clear();

    //
    // first part: Mark all occurances of search term
    //
    if (( text.isEmpty() ))
    {
        qDebug() << text;
        ui->textEdit->SendScintilla(QsciScintillaBase::SCI_INDICSETSTYLE, 0, QsciScintilla::INDIC_PLAIN);
        ui->textEdit->SendScintilla(QsciScintillaBase::SCI_INDICSETFORE,0, QColor(Qt::white));

        //docText = text;
        docText = ui->lineEdit_find->text();
        int end = docText.lastIndexOf(text);
        int cur = -1;

        if(end != -1)
        {
            ui->textEdit->getCursorPosition(&line, &index);
            qDebug() << "line: " << line << " index: " << index;
            while(cur != end)
            {
                cur = docText.indexOf(text,cur+1);
                ui->textEdit->SendScintilla(QsciScintillaBase::SCI_INDICATORALLONFOR,cur, text.length());
                ui->textEdit->SendScintilla(QsciScintillaBase::SCI_INDICATORCLEARRANGE,cur, text.length());
            }
        }
    } // END text.isEmpty(), END mark ALL

    //
    // second part: Find firs occurance of search term
    //
    bool use_regular_expression, is_case_sensitive, match_whole_word_only, use_wrap, search_forward;
    use_regular_expression = false;
    is_case_sensitive = ui->checkBox_CaseSensitive->isChecked();
    match_whole_word_only = ui->checkBox_WholeWords->isChecked();
    use_wrap = true;
    search_forward = ui->radioButton_Forward->isChecked();

    ui->textEdit->SendScintilla(QsciScintillaBase::SCI_INDICSETSTYLE, 0, QsciScintilla::INDIC_PLAIN);
    //ui->textEdit->SendScintilla(QsciScintillaBase::SCI_INDICSETFORE,0, QColor(Qt::darkBlue));

    bool found = ui->textEdit->findFirst(text, use_regular_expression, is_case_sensitive, match_whole_word_only, use_wrap, search_forward);
    qDebug() <<  "START: found = " << found;
    while(found)
    {
        ui->textEdit->getCursorPosition(&line, &index);

        if(found)
        {
            ui->textEdit->SendScintilla(QsciScintillaBase::SCI_INDICATORCLEARRANGE, line, text.length());
            int start = ui->textEdit->positionFromLineIndex(line, index);
            int end = ui->textEdit->positionFromLineIndex(line, index + text.length());
            qDebug() << "line: " << line << " start: " << start << " end: " << end;

        }

        found = false;
    }
}

我很确定这不是有史以来最好的代码，但我能负担得起...;)

也许适合 QScintilla 的人可以纠正我的尝试或为我提供一个有效的搜索和突出显示示例，可以在不保留旧结果的情况下调用多次？

提前致谢，各位!

Answer 1

也许它比你想象的要容易，假设你为你的 ui->textEdit 使用了 QsciScintilla 实例:

#define MY_MARKER_ID 0

void MainWindow::clearMarkers()
{
    int lastLine = ui->textEdit->lines() - 1;
    ui->textEdit->clearIndicatorRange( 0, 0, lastLine, ui->textEdit->text( lastLine ).length() - 1, MY_MARKER_ID );
}