/src/qtbase/src/gui/kernel/qstylehints.cpp

Source
// Copyright (C) 2016 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 "qaccessibilityhints_p.h"
#include <qstylehints.h>
#include "qstylehints_p.h"
#include <qpa/qplatformintegration.h>
#include <qpa/qplatformtheme.h>
#include <private/qguiapplication_p.h>
#include <qdebug.h>

QT_BEGIN_NAMESPACE

static inline QVariant hint(QPlatformIntegration::StyleHint h)
{
    return QGuiApplicationPrivate::platformIntegration()->styleHint(h);
}

static inline QVariant themeableHint(QPlatformTheme::ThemeHint th,
                                     QPlatformIntegration::StyleHint ih)
{
    if (!QCoreApplication::instance()) {
        qWarning("Must construct a QGuiApplication before accessing a platform theme hint.");
        return QVariant();
    }
    if (const QPlatformTheme *theme = QGuiApplicationPrivate::platformTheme()) {
        const QVariant themeHint = theme->themeHint(th);
        if (themeHint.isValid())
            return themeHint;
    }
    return QGuiApplicationPrivate::platformIntegration()->styleHint(ih);
}

static inline QVariant themeableHint(QPlatformTheme::ThemeHint th)
{
    if (!QCoreApplication::instance()) {
        qWarning("Must construct a QGuiApplication before accessing a platform theme hint.");
        return QVariant();
    }
    if (const QPlatformTheme *theme = QGuiApplicationPrivate::platformTheme()) {
        const QVariant themeHint = theme->themeHint(th);
        if (themeHint.isValid())
            return themeHint;
    }
    return QPlatformTheme::defaultThemeHint(th);
}

/*!
    \class QStyleHints
    \since 5.0
    \brief The QStyleHints class contains platform specific hints and settings.
    \inmodule QtGui

    An object of this class, obtained from QGuiApplication, provides access to certain global
    user interface parameters of the current platform.

    The platform provides most of these settings, and they are typically read-only.
    End users can usually adjust them through platform-specific configuration mechanisms.
    However, you can also adjust some settings programmatically through dedicated setter
    functions, (for example, setColorScheme() or setShowShortcutsInContextMenus()),
    which can be useful for testing or specialized application behavior. Any such adjustments
    apply only to the current application.

    Authors of custom user interface components should read
    relevant settings to allow the components to exhibit the same behavior and feel as other
    components.

    \sa QGuiApplication::styleHints()
 */
QStyleHints::QStyleHints()
    : QObject(*new QStyleHintsPrivate(), nullptr)
{
}

/*!
    Sets the \a mouseDoubleClickInterval.
    \internal
    \sa mouseDoubleClickInterval()
    \since 5.3
*/
void  QStyleHints::setMouseDoubleClickInterval(int mouseDoubleClickInterval)
{
    Q_D(QStyleHints);
    if (d->m_mouseDoubleClickInterval == mouseDoubleClickInterval)
        return;
    d->m_mouseDoubleClickInterval = mouseDoubleClickInterval;
    emit mouseDoubleClickIntervalChanged(mouseDoubleClickInterval);
}

/*!
    \property QStyleHints::mouseDoubleClickInterval
    \brief the time limit in milliseconds that distinguishes a double click
    from two consecutive mouse clicks.
*/
int QStyleHints::mouseDoubleClickInterval() const
{
    Q_D(const QStyleHints);
    return d->m_mouseDoubleClickInterval >= 0 ?
           d->m_mouseDoubleClickInterval :
           themeableHint(QPlatformTheme::MouseDoubleClickInterval, QPlatformIntegration::MouseDoubleClickInterval).toInt();
}

/*!
    \property QStyleHints::mouseDoubleClickDistance
    \brief the maximum distance, in pixels, that the mouse can be moved between
    two consecutive mouse clicks and still have it detected as a double-click
    \since 5.14
*/
int QStyleHints::mouseDoubleClickDistance() const
{
    Q_D(const QStyleHints);
    return d->m_mouseDoubleClickDistance >= 0 ?
                d->m_mouseDoubleClickDistance :
                themeableHint(QPlatformTheme::MouseDoubleClickDistance, QPlatformIntegration::MouseDoubleClickDistance).toInt();
}

/*!
    \property QStyleHints::touchDoubleTapDistance
    \brief the maximum distance, in pixels, that a finger can be moved between
    two consecutive taps and still have it detected as a double-tap
    \since 5.14
*/
int QStyleHints::touchDoubleTapDistance() const
{
    Q_D(const QStyleHints);
    return d->m_touchDoubleTapDistance >= 0 ?
                d->m_touchDoubleTapDistance :
                themeableHint(QPlatformTheme::TouchDoubleTapDistance).toInt();
}

/*!
    \property QStyleHints::colorScheme
    \brief the color scheme used by the application.

    By default, this follows the system's default color scheme (also known as appearance),
    and changes when the system color scheme changes (e.g. during dusk or dawn).
    Setting the color scheme to an explicit value will override the system setting and
    ignore any changes to the system's color scheme. However, doing so is a hint to the
    system, and overriding the color scheme is not supported on all platforms.

    Resetting this property, or setting it to \l{Qt::ColorScheme::Unknown}, will remove
    the override and make the application follow the system default again. The property
    value will change to the color scheme the system currently has.

    When this property changes, Qt will read the system palette and update the default
    palette, but won't overwrite palette entries that have been explicitly set by the
    application. When the colorSchemeChange() signal gets emitted, the old palette is
    still in effect.

    Application-specific colors should be selected to work well with the effective
    palette, taking the current color scheme into account. To update application-
    specific colors when the effective palette changes, handle
    \l{QEvent::}{PaletteChange} or \l{QEvent::}{ApplicationPaletteChange} events.

    \sa Qt::ColorScheme, QGuiApplication::palette(), QEvent::PaletteChange
    \since 6.5
*/
Qt::ColorScheme QStyleHints::colorScheme() const
{
    Q_D(const QStyleHints);
    return d->colorScheme();
}

/*!
    \since 6.8

    Sets the color scheme used by the application to an explicit \a scheme, or
    revert to the system's current color scheme if \a scheme is Qt::ColorScheme::Unknown.
*/
void QStyleHints::setColorScheme(Qt::ColorScheme scheme)
{
    if (!QCoreApplication::instance()) {
        qWarning("Must construct a QGuiApplication before accessing a platform theme hint.");
        return;
    }
    if (QPlatformTheme *theme = QGuiApplicationPrivate::platformTheme())
        theme->requestColorScheme(scheme);
}

/*!
    \fn void QStyleHints::unsetColorScheme()
    \since 6.8

    Restores the color scheme to the system's current color scheme.
*/


/*!
    \property QStyleHints::accessibility
    \brief The application's accessibility hints.

    The accessibility hints encapsulates platform dependent accessibility settings
    such as whether the user wishes the application to be in high contrast or not.

    \sa QAccessibilityHints
    \since 6.10
*/
const QAccessibilityHints *QStyleHints::accessibility() const
{
    Q_D(const QStyleHints);
    return d->accessibilityHints();
}

/*!
    \property QStyleHints::toolTipWakeUpDelay
    \brief The delay in milliseconds before tool tips should be shown.
    \since 6.12
    \sa QWidget::toolTip, {QtQuick.Controls::ToolTip::delay}
*/
int QStyleHints::toolTipWakeUpDelay() const
{
    Q_D(const QStyleHints);
    return d->m_toolTipWakeUpDelay;
}

void QStyleHints::setToolTipWakeUpDelay(int toolTipWakeUpDelay)
{
    Q_D(QStyleHints);
    if (d->m_toolTipWakeUpDelay == toolTipWakeUpDelay)
        return;
    d->m_toolTipWakeUpDelay = toolTipWakeUpDelay;
    emit toolTipWakeUpDelayChanged(toolTipWakeUpDelay);
}

/*!
    Sets the \a mousePressAndHoldInterval.
    \internal
    \sa mousePressAndHoldInterval()
    \since 5.7
*/
void QStyleHints::setMousePressAndHoldInterval(int mousePressAndHoldInterval)
{
    Q_D(QStyleHints);
    if (d->m_mousePressAndHoldInterval == mousePressAndHoldInterval)
        return;
    d->m_mousePressAndHoldInterval = mousePressAndHoldInterval;
    emit mousePressAndHoldIntervalChanged(mousePressAndHoldInterval);
}

/*!
    \property QStyleHints::mousePressAndHoldInterval
    \brief the time limit in milliseconds that activates
    a press and hold.

    \since 5.3
*/
int QStyleHints::mousePressAndHoldInterval() const
{
    Q_D(const QStyleHints);
    return d->m_mousePressAndHoldInterval >= 0 ?
           d->m_mousePressAndHoldInterval :
           themeableHint(QPlatformTheme::MousePressAndHoldInterval, QPlatformIntegration::MousePressAndHoldInterval).toInt();
}

/*!
    Sets the \a startDragDistance.
    \internal
    \sa startDragDistance()
    \since 5.3
*/
void QStyleHints::setStartDragDistance(int startDragDistance)
{
    Q_D(QStyleHints);
    if (d->m_startDragDistance == startDragDistance)
        return;
    d->m_startDragDistance = startDragDistance;
    emit startDragDistanceChanged(startDragDistance);
}

/*!
    \property QStyleHints::startDragDistance
    \brief the distance, in pixels, that the mouse must be moved with a button
    held down before a drag and drop operation will begin.

    If you support drag and drop in your application, and want to start a drag
    and drop operation after the user has moved the cursor a certain distance
    with a button held down, you should use this property's value as the
    minimum distance required.

    For example, if the mouse position of the click is stored in \c startPos
    and the current position (e.g. in the mouse move event) is \c currentPos,
    you can find out if a drag should be started with code like this:

    \snippet code/src_gui_kernel_qapplication.cpp 6

    \sa startDragTime, QPoint::manhattanLength(), {Drag and Drop}
*/
int QStyleHints::startDragDistance() const
{
    Q_D(const QStyleHints);
    return d->m_startDragDistance >= 0 ?
           d->m_startDragDistance :
           themeableHint(QPlatformTheme::StartDragDistance, QPlatformIntegration::StartDragDistance).toInt();
}

/*!
    Sets the \a startDragDragTime.
    \internal
    \sa startDragTime()
    \since 5.3
*/
void QStyleHints::setStartDragTime(int startDragTime)
{
    Q_D(QStyleHints);
    if (d->m_startDragTime == startDragTime)
        return;
    d->m_startDragTime = startDragTime;
    emit startDragTimeChanged(startDragTime);
}

/*!
    \property QStyleHints::startDragTime
    \brief the time, in milliseconds, that a mouse button must be held down
    before a drag and drop operation will begin.

    If you support drag and drop in your application, and want to start a drag
    and drop operation after the user has held down a mouse button for a
    certain amount of time, you should use this property's value as the delay.

    \sa startDragDistance, {Drag and Drop}
*/
int QStyleHints::startDragTime() const
{
    Q_D(const QStyleHints);
    return d->m_startDragTime >= 0 ?
           d->m_startDragTime :
           themeableHint(QPlatformTheme::StartDragTime, QPlatformIntegration::StartDragTime).toInt();
}

/*!
    \property QStyleHints::startDragVelocity
    \brief the limit for the velocity, in pixels per second, that the mouse may
    be moved, with a button held down, for a drag and drop operation to begin.
    A value of 0 means there is no such limit.

    \sa startDragDistance, {Drag and Drop}
*/
int QStyleHints::startDragVelocity() const
{
    return themeableHint(QPlatformTheme::StartDragVelocity, QPlatformIntegration::StartDragVelocity).toInt();
}

/*!
    Sets the \a keyboardInputInterval.
    \internal
    \sa keyboardInputInterval()
    \since 5.3
*/
void QStyleHints::setKeyboardInputInterval(int keyboardInputInterval)
{
    Q_D(QStyleHints);
    if (d->m_keyboardInputInterval == keyboardInputInterval)
        return;
    d->m_keyboardInputInterval = keyboardInputInterval;
    emit keyboardInputIntervalChanged(keyboardInputInterval);
}

/*!
    \property QStyleHints::keyboardInputInterval
    \brief the time limit, in milliseconds, that distinguishes a key press
    from two consecutive key presses.
*/
int QStyleHints::keyboardInputInterval() const
{
    Q_D(const QStyleHints);
    return d->m_keyboardInputInterval >= 0 ?
           d->m_keyboardInputInterval :
           themeableHint(QPlatformTheme::KeyboardInputInterval, QPlatformIntegration::KeyboardInputInterval).toInt();
}

#if QT_DEPRECATED_SINCE(6, 5)
/*!
    \property QStyleHints::keyboardAutoRepeatRate
    \brief the rate, in events per second,  in which additional repeated key
    presses will automatically be generated if a key is being held down.
    \deprecated [6.5] Use keyboardAutoRepeatRateF() instead
*/
int QStyleHints::keyboardAutoRepeatRate() const
{
    return themeableHint(QPlatformTheme::KeyboardAutoRepeatRate, QPlatformIntegration::KeyboardAutoRepeatRate).toInt();
}
#endif

/*!
    \property QStyleHints::keyboardAutoRepeatRateF
    \since 6.5
    \brief the rate, in events per second, in which additional repeated key
    presses will automatically be generated if a key is being held down.
*/
qreal QStyleHints::keyboardAutoRepeatRateF() const
{
    return themeableHint(QPlatformTheme::KeyboardAutoRepeatRate, QPlatformIntegration::KeyboardAutoRepeatRate).toReal();
}

/*!
    Sets the \a cursorFlashTime.
    \internal
    \sa cursorFlashTime()
    \since 5.3
*/
void QStyleHints::setCursorFlashTime(int cursorFlashTime)
{
    Q_D(QStyleHints);
    if (d->m_cursorFlashTime == cursorFlashTime)
        return;
    d->m_cursorFlashTime = cursorFlashTime;
    emit cursorFlashTimeChanged(cursorFlashTime);
}

/*!
    \property QStyleHints::cursorFlashTime
    \brief the text cursor's flash (blink) time in milliseconds.

    The flash time is the time used to display, invert and restore the
    caret display. Usually the text cursor is displayed for half the cursor
    flash time, then hidden for the same amount of time.
*/
int QStyleHints::cursorFlashTime() const
{
    Q_D(const QStyleHints);
    return d->m_cursorFlashTime >= 0 ?
           d->m_cursorFlashTime :
           themeableHint(QPlatformTheme::CursorFlashTime, QPlatformIntegration::CursorFlashTime).toInt();
}

/*!
    \property QStyleHints::showIsFullScreen
    \brief whether the platform defaults to fullscreen windows.

    This property is \c true if the platform defaults to windows being fullscreen,
    otherwise \c false.

    \note The platform may still choose to show certain windows non-fullscreen,
    such as popups or dialogs. This property only reports the default behavior.

    \sa QWindow::show(), showIsMaximized()
*/
bool QStyleHints::showIsFullScreen() const
{
    return hint(QPlatformIntegration::ShowIsFullScreen).toBool();
}

/*!
    \property QStyleHints::showIsMaximized
    \brief whether the platform defaults to maximized windows.

    This property is \c true if the platform defaults to windows being maximized,
    otherwise \c false.

    \note The platform may still choose to show certain windows non-maximized,
    such as popups or dialogs. This property only reports the default behavior.

    \sa QWindow::show(), showIsFullScreen()
    \since 5.6
*/
bool QStyleHints::showIsMaximized() const
{
    return hint(QPlatformIntegration::ShowIsMaximized).toBool();
}

/*!
    \property QStyleHints::showShortcutsInContextMenus
    \since 5.10
    \brief \c true if the platform normally shows shortcut key sequences in
    context menus, otherwise \c false.

    Since Qt 5.13, the setShowShortcutsInContextMenus() function can be used to
    override the platform default.

    \sa Qt::AA_DontShowShortcutsInContextMenus
*/
bool QStyleHints::showShortcutsInContextMenus() const
{
    Q_D(const QStyleHints);
    return d->m_showShortcutsInContextMenus >= 0
        ? d->m_showShortcutsInContextMenus != 0
        : themeableHint(QPlatformTheme::ShowShortcutsInContextMenus, QPlatformIntegration::ShowShortcutsInContextMenus).toBool();
}

void QStyleHints::setShowShortcutsInContextMenus(bool s)
{
    Q_D(QStyleHints);
    if (s != showShortcutsInContextMenus()) {
        d->m_showShortcutsInContextMenus = s ? 1 : 0;
        emit showShortcutsInContextMenusChanged(s);
    }
}

/*!
    \property QStyleHints::contextMenuTrigger
    \since 6.8
    \brief mouse event used to trigger a context menu event.

    The default on UNIX systems is to show context menu on mouse button press event, while on
    Windows it is the mouse button release event. This property can be used to override the default
    platform behavior.

    \note Developers must use this property with great care, as it changes the default interaction
    mode that their users will expect on the platform that they are running on.

    \sa Qt::ContextMenuTrigger
*/
Qt::ContextMenuTrigger QStyleHints::contextMenuTrigger() const
{
    Q_D(const QStyleHints);
    if (d->m_contextMenuTrigger == -1) {
        return themeableHint(QPlatformTheme::ContextMenuOnMouseRelease).toBool()
                   ? Qt::ContextMenuTrigger::Release
                   : Qt::ContextMenuTrigger::Press;
    }
    return Qt::ContextMenuTrigger(d->m_contextMenuTrigger);
}

void QStyleHints::setContextMenuTrigger(Qt::ContextMenuTrigger contextMenuTrigger)
{
    Q_D(QStyleHints);
    const Qt::ContextMenuTrigger currentTrigger = this->contextMenuTrigger();
    d->m_contextMenuTrigger = int(contextMenuTrigger);
    if (currentTrigger != contextMenuTrigger)
        emit contextMenuTriggerChanged(contextMenuTrigger);
}

/*!
    \property QStyleHints::menuSelectionWraps
    \since 6.10
    \brief menu selection wraps around.

    Returns \c true if menu selection wraps. That is, whether key navigation moves
    the selection to the first menu item again after the last menu item has been
    reached, and vice versa.
*/
bool QStyleHints::menuSelectionWraps() const
{
    return themeableHint(QPlatformTheme::MenuSelectionWraps).toBool();
}

/*!
    \property QStyleHints::passwordMaskDelay
    \brief the time, in milliseconds, a typed letter is displayed unshrouded
    in a text input field in password mode.
*/
int QStyleHints::passwordMaskDelay() const
{
    return themeableHint(QPlatformTheme::PasswordMaskDelay, QPlatformIntegration::PasswordMaskDelay).toInt();
}

/*!
    \property QStyleHints::passwordMaskCharacter
    \brief the character used to mask the characters typed into text input
    fields in password mode.
*/
QChar QStyleHints::passwordMaskCharacter() const
{
    return themeableHint(QPlatformTheme::PasswordMaskCharacter, QPlatformIntegration::PasswordMaskCharacter).toChar();
}

/*!
    \property QStyleHints::fontSmoothingGamma
    \brief the gamma value used in font smoothing.
*/
qreal QStyleHints::fontSmoothingGamma() const
{
    return hint(QPlatformIntegration::FontSmoothingGamma).toReal();
}

/*!
    \property QStyleHints::useRtlExtensions
    \brief the writing direction.

    This property is \c true if right-to-left writing direction is enabled,
    otherwise \c false.
*/
bool QStyleHints::useRtlExtensions() const
{
    return hint(QPlatformIntegration::UseRtlExtensions).toBool();
}

/*!
    \property QStyleHints::setFocusOnTouchRelease
    \brief the event that should set input focus on focus objects.

    This property is \c true if focus objects (line edits etc) should receive
    input focus after a touch/mouse release. This is normal behavior on
    touch platforms. On desktop platforms, the standard is to set
    focus already on touch/mouse press.
*/
bool QStyleHints::setFocusOnTouchRelease() const
{
    return themeableHint(QPlatformTheme::SetFocusOnTouchRelease, QPlatformIntegration::SetFocusOnTouchRelease).toBool();
}

/*!
    \property QStyleHints::tabFocusBehavior
    \since 5.5
    \brief The focus behavior on press of the tab key.

    \note Do not bind this value in QML because the change notifier
    signal is not implemented yet.
*/

Qt::TabFocusBehavior QStyleHints::tabFocusBehavior() const
{
    Q_D(const QStyleHints);
    return Qt::TabFocusBehavior(d->m_tabFocusBehavior >= 0 ?
                                d->m_tabFocusBehavior :
                                themeableHint(QPlatformTheme::TabFocusBehavior, QPlatformIntegration::TabFocusBehavior).toInt());
}

/*!
    Sets the \a tabFocusBehavior.
    \internal
    \sa tabFocusBehavior()
    \since 5.7
*/
void QStyleHints::setTabFocusBehavior(Qt::TabFocusBehavior tabFocusBehavior)
{
    Q_D(QStyleHints);
    if (d->m_tabFocusBehavior == tabFocusBehavior)
        return;
    d->m_tabFocusBehavior = tabFocusBehavior;
    emit tabFocusBehaviorChanged(tabFocusBehavior);
}

/*!
    \property QStyleHints::singleClickActivation
    \brief whether items are activated by single or double click.

    This property is \c true if items should be activated by single click, \c false
    if they should be activated by double click instead.

    \since 5.5
*/
bool QStyleHints::singleClickActivation() const
{
    return themeableHint(QPlatformTheme::ItemViewActivateItemOnSingleClick, QPlatformIntegration::ItemViewActivateItemOnSingleClick).toBool();
}

/*!
    \property QStyleHints::useHoverEffects
    \brief whether UI elements use hover effects.

    This property is \c true if UI elements should use hover effects. This is the
    standard behavior on desktop platforms with a mouse pointer, whereas
    on touch platforms the overhead of hover event delivery can be avoided.

    \since 5.8
*/
bool QStyleHints::useHoverEffects() const
{
    Q_D(const QStyleHints);
    return (d->m_uiEffects >= 0 ?
            d->m_uiEffects :
            themeableHint(QPlatformTheme::UiEffects, QPlatformIntegration::UiEffects).toInt()) & QPlatformTheme::HoverEffect;
}

void QStyleHints::setUseHoverEffects(bool useHoverEffects)
{
    Q_D(QStyleHints);
    if (d->m_uiEffects >= 0 && useHoverEffects == bool(d->m_uiEffects & QPlatformTheme::HoverEffect))
        return;
    if (d->m_uiEffects == -1)
        d->m_uiEffects = 0;
    if (useHoverEffects)
        d->m_uiEffects |= QPlatformTheme::HoverEffect;
    else
        d->m_uiEffects &= ~QPlatformTheme::HoverEffect;
    emit useHoverEffectsChanged(useHoverEffects);
}

/*!
    \property QStyleHints::wheelScrollLines
    \brief Number of lines to scroll by default for each wheel click.

    \since 5.9
*/
int QStyleHints::wheelScrollLines() const
{
    Q_D(const QStyleHints);
    if (d->m_wheelScrollLines > 0)
        return d->m_wheelScrollLines;
    return themeableHint(QPlatformTheme::WheelScrollLines, QPlatformIntegration::WheelScrollLines).toInt();
}

/*!
    Sets the \a wheelScrollLines.
    \internal
    \sa wheelScrollLines()
    \since 5.9
*/
void QStyleHints::setWheelScrollLines(int scrollLines)
{
    Q_D(QStyleHints);
    if (d->m_wheelScrollLines == scrollLines)
        return;
    d->m_wheelScrollLines = scrollLines;
    emit wheelScrollLinesChanged(scrollLines);
}

/*!
    Sets the mouse quick selection threshold.
    \internal
    \sa mouseQuickSelectionThreshold()
    \since 5.11
*/
void QStyleHints::setMouseQuickSelectionThreshold(int threshold)
{
    Q_D(QStyleHints);
    if (d->m_mouseQuickSelectionThreshold == threshold)
        return;
    d->m_mouseQuickSelectionThreshold = threshold;
    emit mouseQuickSelectionThresholdChanged(threshold);
}

/*!
    \property QStyleHints::mouseQuickSelectionThreshold
    \brief Quick selection mouse threshold in QLineEdit.

    This property defines how much the mouse cursor should be moved along the y axis
    to trigger a quick selection during a normal QLineEdit text selection.

    If the property value is less than or equal to 0, the quick selection feature is disabled.

    \since 5.11
*/
int QStyleHints::mouseQuickSelectionThreshold() const
{
    Q_D(const QStyleHints);
    if (d->m_mouseQuickSelectionThreshold >= 0)
        return d->m_mouseQuickSelectionThreshold;
    return themeableHint(QPlatformTheme::MouseQuickSelectionThreshold, QPlatformIntegration::MouseQuickSelectionThreshold).toInt();
}

/*!
   \internal
   QStyleHintsPrivate::updateColorScheme - set a new color scheme.

   This function is called by the QPA plugin when the system theme changes. This in
   turn might be the result of an explicit request of a color scheme via setColorScheme.

   Set \a colorScheme as the new color scheme of the QStyleHints.
   The colorSchemeChanged signal will be emitted if present and new color scheme differ.
 */
void QStyleHintsPrivate::updateColorScheme(Qt::ColorScheme colorScheme)
{
    if (m_colorScheme == colorScheme)
        return;
    m_colorScheme = colorScheme;
    Q_Q(QStyleHints);
    emit q->colorSchemeChanged(colorScheme);
}

/*!
    \internal

    Helper function that updates the style hints when the theme changes
*/
void QStyleHintsPrivate::update(const QPlatformTheme *theme)
{
    Q_ASSERT(theme);
    updateColorScheme(theme->colorScheme());
    auto *accessibilityHintsPrivate = QAccessibilityHintsPrivate::get(accessibilityHints());
    accessibilityHintsPrivate->updateContrastPreference(theme->contrastPreference());
    accessibilityHintsPrivate->updateMotionPreference(theme->motionPreference());
}

QAccessibilityHints *QStyleHintsPrivate::accessibilityHints() const
{
    Q_Q(const QStyleHints);
    if (!m_accessibilityHints)
        const_cast<QStyleHintsPrivate *>(this)->m_accessibilityHints = new QAccessibilityHints(const_cast<QStyleHints*>(q));
    return m_accessibilityHints;
}

QStyleHintsPrivate *QStyleHintsPrivate::get(QStyleHints *q)
{
    Q_ASSERT(q);
    return q->d_func();
}

QT_END_NAMESPACE

#include "moc_qstylehints.cpp"

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Created: 2026-05-31 06:50