qt-creator/src/plugins/texteditor/normalindenter.cpp

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** Copyright (C) 2016 The Qt Company Ltd.
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#include "normalindenter.h"
#include "tabsettings.h"

#include <QTextDocument>

using namespace TextEditor;

NormalIndenter::NormalIndenter()
{}

NormalIndenter::~NormalIndenter()
{}

// Indent a text block based on previous line.
// Simple text paragraph layout:
// aaaa aaaa
//
//   bbb bb
//   bbb bb
//
//  - list
//    list line2
//
//  - listn
//
// ccc
//
// @todo{Add formatting to wrap paragraphs. This requires some
// hoops as the current indentation routines are not prepared
// for additional block being inserted. It might be possible
// to do in 2 steps (indenting/wrapping)}
//
void NormalIndenter::indentBlock(QTextDocument *doc,
                                 const QTextBlock &block,
                                 const QChar &typedChar,
                                 const TabSettings &tabSettings)
{
    Q_UNUSED(typedChar)

    // At beginning: Leave as is.
    if (block == doc->begin())
        return;

    const QTextBlock previous = block.previous();
    const QString previousText = previous.text();
    // Empty line indicates a start of a new paragraph. Leave as is.
    if (previousText.isEmpty() || previousText.trimmed().isEmpty())
        return;

    // Just use previous line.
    // Skip blank characters when determining the indentation
    int i = 0;
    while (i < previousText.size()) {
        if (!previousText.at(i).isSpace()) {
            tabSettings.indentLine(block, tabSettings.columnAt(previousText, i));
            break;
        }
        ++i;
    }
}