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。

首先运行接缝，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，或者为我提供一个可以在不保留旧结果的情况下多次调用的有效搜索和突出显示示例？

提前谢谢各位！

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 );
}