eventfilter.cpp

// SPDX-FileCopyrightText: Copyright (C) 2019 swift Project Community / Contributors
// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-swift-pilot-client-1
 
#include "eventfilter.h"
 
#include <QKeyEvent>
#include <QPlainTextEdit>
 
#include "misc/stringutils.h"
 
namespace swift::gui
{
    bool CUpperCaseEventFilter::eventFilter(QObject *object, QEvent *event)
    {
        if (event->type() == QEvent::KeyPress)
        {
            if (auto *e = dynamic_cast<QKeyEvent *>(event))
            {
                // If QKeyEvent::text() returns an empty QString then let normal
                // processing proceed as it may be a control (e.g. cursor movement)
                // key.  Otherwise convert the text to upper case and insert it at
                // the current cursor position.
                auto *pte = qobject_cast<QPlainTextEdit *>(object);
                if (!pte)
                {
                    return false;
                }
                if (pte->isReadOnly())
                {
                    return false;
                }
 
                if (e->text().length() == 1)
                {
                    const QChar c = e->text().front();
                    if (c.isLetter())
                    {
                        const ushort unicode = c.unicode();
                        if (unicode > 127)
                        {
                            return true;
                        }
 
                        pte->insertPlainText(e->text().toUpper());
                        // return true to prevent further processing
                        return true;
                    }
                    // all codes like backspace etc.
                    return false;
                } // length
            } // key event
        }
        return false;
    }
} // namespace swift::gui