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// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
// Qt-Security score:significant reason:default
#include "qquickmnemoniclabel_p.h"
#include <QtGui/private/qguiapplication_p.h>
#include <QtGui/qpa/qplatformtheme.h>
#include <QtQuick/private/qquicktext_p_p.h>
QT_BEGIN_NAMESPACE
QQuickMnemonicLabel::QQuickMnemonicLabel(QQuickItem *parent)
: QQuickText(parent)
{
m_mnemonicEnabled = QGuiApplicationPrivate::platformTheme()->themeHint(
QPlatformTheme::MnemonicsEnabled).toBool();
}
QString QQuickMnemonicLabel::text() const
{
return m_fullText;
}
void QQuickMnemonicLabel::setText(const QString &text)
{
if (m_fullText == text)
return;
m_fullText = text;
updateMnemonic();
}
/*!
\internal
This property determines whether \c "&" in \l text is treated as a
mnemonic marker (\c true) or displayed literally (\c false).
If \c true, QQuickMnemonicLabel parses \c "&" as a mnemonic marker and
removes it from the displayed text, underlining the character that
follows it (see \c updateMnemonic()). The character is not underlined when
\c QPlatformTheme::UnderlineShortcut is \c false for the current platform,
but the \c "&" is still removed.
If \c false, \c "&" has no special meaning and is displayed literally,
which allows it to be used in text such as \c "Cats & Dogs".
For example, given \l text of \c "M&nemonic":
\list
\li \c true: the displayed text is \c "Mnemonic", with the \c "n" underlined
(depending on \c QPlatformTheme::UnderlineShortcut).
\li \c false: the displayed text is \c "M&nemonic" (unchanged).
\endlist
The default value is \c true if the platform supports mnemonics
(\c QPlatformTheme::MnemonicsEnabled), otherwise \c false.
*/
bool QQuickMnemonicLabel::isMnemonicEnabled() const
{
return m_mnemonicEnabled;
}
void QQuickMnemonicLabel::setMnemonicEnabled(bool enabled)
{
if (m_mnemonicEnabled == enabled)
return;
m_mnemonicEnabled = enabled;
updateMnemonic();
if (isComponentComplete())
forceLayout();
}
static QTextLayout::FormatRange underlineRange(int start, int length = 1)
{
QTextLayout::FormatRange range;
range.start = start;
range.length = length;
range.format.setFontUnderline(true);
return range;
}
// based on QPlatformTheme::removeMnemonics()
void QQuickMnemonicLabel::updateMnemonic()
{
if (!m_mnemonicEnabled) {
// "&" has no special meaning; display the text as-is.
QQuickTextPrivate::get(this)->layout.setFormats({});
QQuickText::setText(m_fullText);
return;
}
const bool showUnderline = QGuiApplicationPrivate::platformTheme()->themeHint(
QPlatformTheme::UnderlineShortcut).toBool();
QString text(m_fullText.size(), QChar::Null);
int idx = 0;
int pos = 0;
int len = m_fullText.size();
QList<QTextLayout::FormatRange> formats;
while (len) {
if (m_fullText.at(pos) == QLatin1Char('&') && (len == 1 || m_fullText.at(pos + 1) != QLatin1Char('&'))) {
// A plain mnemonic marker, e.g. "M&nemonic": drop the "&" and
// underline the character that follows it.
if (showUnderline && (pos == 0 || m_fullText.at(pos - 1) != QLatin1Char('&')))
formats += underlineRange(pos);
++pos;
--len;
if (len == 0)
break;
} else if (m_fullText.at(pos) == QLatin1Char('(') && len >= 4 &&
m_fullText.at(pos + 1) == QLatin1Char('&') &&
m_fullText.at(pos + 2) != QLatin1Char('&') &&
m_fullText.at(pos + 3) == QLatin1Char(')')) {
// A mnemonic with format "\s*(&X)", used when the label itself has
// no natural character to underline (e.g. non-Latin scripts). Keep
// "X" in the text, and underline it if the platform draws
// underlines for shortcuts.
if (showUnderline)
formats += underlineRange(pos + 1);
}
text[idx] = m_fullText.at(pos);
++pos;
++idx;
--len;
}
text.truncate(idx);
QQuickTextPrivate::get(this)->layout.setFormats(formats);
QQuickText::setText(text);
}
QT_END_NAMESPACE
#include "moc_qquickmnemoniclabel_p.cpp"
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