qkeysequenceedit.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// Copyright (C) 2013 Ivan Komissarov.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include "qkeysequenceedit.h"
#include "qkeysequenceedit_p.h"
 
#include "qboxlayout.h"
#include "qlineedit.h"
#include <private/qkeymapper_p.h>
 
QT_BEGIN_NAMESPACE
 
static_assert(QKeySequencePrivate::MaxKeyCount == 4); // assumed by the code around here
 
void QKeySequenceEditPrivate::init()
{
    Q_Q(QKeySequenceEdit);
 
    lineEdit = new QLineEdit(q);
    lineEdit->setObjectName(QStringLiteral("qt_keysequenceedit_lineedit"));
    lineEdit->setClearButtonEnabled(false);
    q->connect(lineEdit, &QLineEdit::textChanged, q, [q](const QString& text) {
        // Clear the shortcut if the user clicked on the clear icon
        if (text.isEmpty())
            q->clear();
    });
 
    keyNum = 0;
    prevKey = -1;
    releaseTimer = 0;
    finishingKeyCombinations = {Qt::Key_Tab, Qt::Key_Backtab};
 
    QVBoxLayout *layout = new QVBoxLayout(q);
    layout->setContentsMargins(0, 0, 0, 0);
    layout->addWidget(lineEdit);
 
    std::fill_n(key, QKeySequencePrivate::MaxKeyCount, QKeyCombination::fromCombined(0));
 
    lineEdit->setFocusProxy(q);
    lineEdit->installEventFilter(q);
    resetState();
 
    q->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
    q->setFocusPolicy(Qt::StrongFocus);
    q->setAttribute(Qt::WA_MacShowFocusRect, true);
    q->setAttribute(Qt::WA_InputMethodEnabled, false);
}
 
int QKeySequenceEditPrivate::translateModifiers(Qt::KeyboardModifiers state, const QString &text)
{
    Q_UNUSED(text);
    int result = 0;
    if (state & Qt::ControlModifier)
        result |= Qt::CTRL;
    if (state & Qt::MetaModifier)
        result |= Qt::META;
    if (state & Qt::AltModifier)
        result |= Qt::ALT;
    return result;
}
 
void QKeySequenceEditPrivate::resetState()
{
    Q_Q(QKeySequenceEdit);
 
    if (releaseTimer) {
        q->killTimer(releaseTimer);
        releaseTimer = 0;
    }
    prevKey = -1;
    lineEdit->setText(keySequence.toString(QKeySequence::NativeText));
    lineEdit->setPlaceholderText(QKeySequenceEdit::tr("Press shortcut"));
}
 
void QKeySequenceEditPrivate::finishEditing()
{
    Q_Q(QKeySequenceEdit);
 
    resetState();
    emit q->keySequenceChanged(keySequence);
    emit q->editingFinished();
}
 
QKeySequenceEdit::QKeySequenceEdit(QWidget *parent)
    : QKeySequenceEdit(*new QKeySequenceEditPrivate, parent, { })
{
}
 
QKeySequenceEdit::QKeySequenceEdit(const QKeySequence &keySequence, QWidget *parent)
    : QKeySequenceEdit(parent)
{
    setKeySequence(keySequence);
}
 
QKeySequenceEdit::QKeySequenceEdit(QKeySequenceEditPrivate &dd, QWidget *parent, Qt::WindowFlags f) :
    QWidget(dd, parent, f)
{
    Q_D(QKeySequenceEdit);
    d->init();
}
 
QKeySequenceEdit::~QKeySequenceEdit()
{
}
 
QKeySequence QKeySequenceEdit::keySequence() const
{
    Q_D(const QKeySequenceEdit);
 
    return d->keySequence;
}
 
void QKeySequenceEdit::setClearButtonEnabled(bool enable)
{
    Q_D(QKeySequenceEdit);
 
    d->lineEdit->setClearButtonEnabled(enable);
}
 
bool QKeySequenceEdit::isClearButtonEnabled() const
{
    Q_D(const QKeySequenceEdit);
 
    return d->lineEdit->isClearButtonEnabled();
}
 
qsizetype QKeySequenceEdit::maximumSequenceLength() const
{
    Q_D(const QKeySequenceEdit);
    return d->maximumSequenceLength;
}
 
void QKeySequenceEdit::setMaximumSequenceLength(qsizetype count)
{
    Q_D(QKeySequenceEdit);
 
    if (count < 1 || count > QKeySequencePrivate::MaxKeyCount) {
        qWarning("QKeySequenceEdit: maximumSequenceLength %lld is out of range (1..%d)",
                 qlonglong(count), QKeySequencePrivate::MaxKeyCount);
        return;
    }
    d->maximumSequenceLength = int(count);
    if (d->keyNum > count) {
        for (qsizetype i = d->keyNum; i < count; ++i)
            d->key[i] = QKeyCombination::fromCombined(0);
        d->keyNum = count;
        d->rebuildKeySequence();
    }
}
 
void QKeySequenceEdit::setFinishingKeyCombinations(const QList<QKeyCombination> &finishingKeyCombinations)
{
    Q_D(QKeySequenceEdit);
 
    d->finishingKeyCombinations = finishingKeyCombinations;
}
 
QList<QKeyCombination> QKeySequenceEdit::finishingKeyCombinations() const
{
    Q_D(const QKeySequenceEdit);
 
    return d->finishingKeyCombinations;
}
 
void QKeySequenceEdit::setKeySequence(const QKeySequence &keySequence)
{
    Q_D(QKeySequenceEdit);
 
    d->resetState();
 
    if (d->keySequence == keySequence)
        return;
 
    const auto desiredCount = keySequence.count();
    if (desiredCount > d->maximumSequenceLength) {
        qWarning("QKeySequenceEdit: setting a key sequence of length %d "
                 "when maximumSequenceLength is %d, truncating.",
                 desiredCount, d->maximumSequenceLength);
    }
 
    d->keyNum = std::min(desiredCount, d->maximumSequenceLength);
    for (int i = 0; i < d->keyNum; ++i)
        d->key[i] = keySequence[i];
    for (int i = d->keyNum; i < QKeySequencePrivate::MaxKeyCount; ++i)
        d->key[i] = QKeyCombination::fromCombined(0);
 
    d->rebuildKeySequence();
 
    d->lineEdit->setText(d->keySequence.toString(QKeySequence::NativeText));
 
    emit keySequenceChanged(d->keySequence);
}
 
void QKeySequenceEdit::clear()
{
    setKeySequence(QKeySequence());
}
 
bool QKeySequenceEdit::event(QEvent *e)
{
    Q_D(const QKeySequenceEdit);
 
    switch (e->type()) {
    case QEvent::Shortcut:
        return true;
    case QEvent::ShortcutOverride:
        e->accept();
        return true;
    case QEvent::KeyPress: {
            QKeyEvent *ke = static_cast<QKeyEvent *>(e);
            if (!d->finishingKeyCombinations.contains(ke->keyCombination())) {
                keyPressEvent(ke);
                return true;
            }
        }
        break;
    default:
        break;
    }
 
    return QWidget::event(e);
}
 
void QKeySequenceEdit::keyPressEvent(QKeyEvent *e)
{
    Q_D(QKeySequenceEdit);
 
    if (d->finishingKeyCombinations.contains(e->keyCombination())) {
        d->finishEditing();
        return;
    }
 
    int nextKey = e->key();
 
    if (d->prevKey == -1) {
        clear();
        d->prevKey = nextKey;
    }
 
    d->lineEdit->setPlaceholderText(QString());
    if (nextKey == Qt::Key_Control
            || nextKey == Qt::Key_Shift
            || nextKey == Qt::Key_Meta
            || nextKey == Qt::Key_Alt
            || nextKey == Qt::Key_unknown) {
        return;
    }
 
    QString selectedText = d->lineEdit->selectedText();
    if (!selectedText.isEmpty() && selectedText == d->lineEdit->text()) {
        clear();
        if (nextKey == Qt::Key_Backspace)
            return;
    }
 
    if (d->keyNum >= d->maximumSequenceLength)
        return;
 
    if (e->modifiers() & Qt::ShiftModifier) {
        QList<int> possibleKeys = QKeyMapper::possibleKeys(e);
        int pkTotal = possibleKeys.size();
        if (!pkTotal)
            return;
        bool found = false;
        for (int i = 0; i < possibleKeys.size(); ++i) {
            if (possibleKeys.at(i) - nextKey == int(e->modifiers())
                || (possibleKeys.at(i) == nextKey && e->modifiers() == Qt::ShiftModifier)) {
                nextKey = possibleKeys.at(i);
                found = true;
                break;
            }
        }
        // Use as fallback
        if (!found)
            nextKey = possibleKeys.first();
    } else {
        nextKey |= d->translateModifiers(e->modifiers(), e->text());
    }
 
 
    d->key[d->keyNum] = QKeyCombination::fromCombined(nextKey);
    d->keyNum++;
 
    d->rebuildKeySequence();
    QString text = d->keySequence.toString(QKeySequence::NativeText);
    if (d->keyNum < d->maximumSequenceLength) {
        //: This text is an "unfinished" shortcut, expands like "Ctrl+A, ..."
        text = tr("%1, ...").arg(text);
    }
    d->lineEdit->setText(text);
    e->accept();
}
 
void QKeySequenceEdit::keyReleaseEvent(QKeyEvent *e)
{
    Q_D(QKeySequenceEdit);
 
    if (d->prevKey == e->key()) {
        if (d->keyNum < d->maximumSequenceLength)
            d->releaseTimer = startTimer(1000);
        else
            d->finishEditing();
    }
    e->accept();
}
 
void QKeySequenceEdit::timerEvent(QTimerEvent *e)
{
    Q_D(QKeySequenceEdit);
    if (e->timerId() == d->releaseTimer) {
        d->finishEditing();
        return;
    }
 
    QWidget::timerEvent(e);
}
 
void QKeySequenceEdit::focusOutEvent(QFocusEvent *e)
{
    Q_D(QKeySequenceEdit);
    if (e->reason() != Qt::PopupFocusReason)
        d->finishEditing();
    QWidget::focusOutEvent(e);
}
 
QT_END_NAMESPACE
 
#include "moc_qkeysequenceedit.cpp"