File indexing completed on 2024-05-05 03:56:27

 /*
  *  SPDX-FileCopyrightText: 2017 by Marco Martin <mart@kde.org>
  *  SPDX-FileCopyrightText: 2021 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
  *  SPDX-License-Identifier: LGPL-2.0-or-later
  */
 
 #include "platformtheme.h"
 #include "basictheme_p.h"
 #include "platformpluginfactory.h"
 #include <QDebug>
 #include <QDir>
 #include <QGuiApplication>
 #include <QPluginLoader>
 #include <QPointer>
 #include <QQmlContext>
 #include <QQmlEngine>
 #include <QQuickStyle>
 #include <QQuickWindow>
 
 #include <array>
 #include <cinttypes>
 #include <functional>
 #include <memory>
 #include <unordered_map>
 
 namespace Kirigami
 {
 namespace Platform
 {
 template<>
 KIRIGAMIPLATFORM_EXPORT QEvent::Type PlatformThemeEvents::DataChangedEvent::type = QEvent::None;
 template<>
 KIRIGAMIPLATFORM_EXPORT QEvent::Type PlatformThemeEvents::ColorSetChangedEvent::type = QEvent::None;
 template<>
 KIRIGAMIPLATFORM_EXPORT QEvent::Type PlatformThemeEvents::ColorGroupChangedEvent::type = QEvent::None;
 template<>
 KIRIGAMIPLATFORM_EXPORT QEvent::Type PlatformThemeEvents::ColorChangedEvent::type = QEvent::None;
 template<>
 KIRIGAMIPLATFORM_EXPORT QEvent::Type PlatformThemeEvents::FontChangedEvent::type = QEvent::None;
 
 // Initialize event types.
 // We want to avoid collisions with application event types so we should use
 // registerEventType for generating the event types. Unfortunately, that method
 // is not constexpr so we need to call it somewhere during application startup.
 // This struct handles that.
 struct TypeInitializer {
     TypeInitializer()
     {
         PlatformThemeEvents::DataChangedEvent::type = QEvent::Type(QEvent::registerEventType());
         PlatformThemeEvents::ColorSetChangedEvent::type = QEvent::Type(QEvent::registerEventType());
         PlatformThemeEvents::ColorGroupChangedEvent::type = QEvent::Type(QEvent::registerEventType());
         PlatformThemeEvents::ColorChangedEvent::type = QEvent::Type(QEvent::registerEventType());
         PlatformThemeEvents::FontChangedEvent::type = QEvent::Type(QEvent::registerEventType());
     }
 };
 static TypeInitializer initializer;
 
 // This class encapsulates the actual data of the Theme object. It may be shared
 // among several instances of PlatformTheme, to ensure that the memory usage of
 // PlatformTheme stays low.
 class PlatformThemeData : public QObject
 {
     Q_OBJECT
 
 public:
     // An enum for all colors in PlatformTheme.
     // This is used so we can have a QHash of local overrides in the
     // PlatformTheme, which avoids needing to store all these colors in
     // PlatformTheme even when they're not used.
     enum ColorRole {
         TextColor,
         DisabledTextColor,
         HighlightedTextColor,
         ActiveTextColor,
         LinkColor,
         VisitedLinkColor,
         NegativeTextColor,
         NeutralTextColor,
         PositiveTextColor,
         BackgroundColor,
         AlternateBackgroundColor,
         HighlightColor,
         ActiveBackgroundColor,
         LinkBackgroundColor,
         VisitedLinkBackgroundColor,
         NegativeBackgroundColor,
         NeutralBackgroundColor,
         PositiveBackgroundColor,
         FocusColor,
         HoverColor,
 
         // This should always be the last item. It indicates how many items
         // there are and is used for the storage array below.
         ColorRoleCount,
     };
 
     using ColorMap = std::unordered_map<std::underlying_type<ColorRole>::type, QColor>;
 
     // Which PlatformTheme instance "owns" this data object. Only the owner is
     // allowed to make changes to data.
     QPointer<PlatformTheme> owner;
 
     PlatformTheme::ColorSet colorSet = PlatformTheme::Window;
     PlatformTheme::ColorGroup colorGroup = PlatformTheme::Active;
 
     std::array<QColor, ColorRoleCount> colors;
 
     QFont defaultFont;
     QFont smallFont;
 
     QPalette palette;
 
     // A list of PlatformTheme instances that want to be notified when the data
     // changes. This is used instead of signal/slots as this way we only store
     // a little bit of data and that data is shared among instances, whereas
     // signal/slots turn out to have a pretty large memory overhead per instance.
     using Watcher = PlatformTheme *;
     QList<Watcher> watchers;
 
     inline void setColorSet(PlatformTheme *sender, PlatformTheme::ColorSet set)
     {
         if (sender != owner || colorSet == set) {
             return;
         }
 
         auto oldValue = colorSet;
 
         colorSet = set;
 
         notifyWatchers<PlatformTheme::ColorSet>(sender, oldValue, set);
     }
 
     inline void setColorGroup(PlatformTheme *sender, PlatformTheme::ColorGroup group)
     {
         if (sender != owner || colorGroup == group) {
             return;
         }
 
         auto oldValue = colorGroup;
 
         colorGroup = group;
         palette.setCurrentColorGroup(QPalette::ColorGroup(group));
 
         notifyWatchers<PlatformTheme::ColorGroup>(sender, oldValue, group);
     }
 
     inline void setColor(PlatformTheme *sender, ColorRole role, const QColor &color)
     {
         if (sender != owner || colors[role] == color) {
             return;
         }
 
         auto oldValue = colors[role];
 
         colors[role] = color;
         updatePalette(palette, colors);
 
         notifyWatchers<QColor>(sender, oldValue, colors[role]);
     }
 
     inline void setDefaultFont(PlatformTheme *sender, const QFont &font)
     {
         if (sender != owner || font == defaultFont) {
             return;
         }
 
         auto oldValue = defaultFont;
 
         defaultFont = font;
 
         notifyWatchers<QFont>(sender, oldValue, font);
     }
 
     inline void setSmallFont(PlatformTheme *sender, const QFont &font)
     {
         if (sender != owner || font == smallFont) {
             return;
         }
 
         auto oldValue = smallFont;
 
         smallFont = font;
 
         notifyWatchers<QFont>(sender, oldValue, smallFont);
     }
 
     inline void addChangeWatcher(PlatformTheme *object)
     {
         watchers.append(object);
     }
 
     inline void removeChangeWatcher(PlatformTheme *object)
     {
         watchers.removeOne(object);
     }
 
     template<typename T>
     inline void notifyWatchers(PlatformTheme *sender, const T &oldValue, const T &newValue)
     {
         for (auto object : std::as_const(watchers)) {
             PlatformThemeEvents::PropertyChangedEvent<T> event(sender, oldValue, newValue);
             QCoreApplication::sendEvent(object, &event);
         }
     }
 
     // Update a palette from a list of colors.
     inline static void updatePalette(QPalette &palette, const std::array<QColor, ColorRoleCount> &colors)
     {
         for (std::size_t i = 0; i < colors.size(); ++i) {
             setPaletteColor(palette, ColorRole(i), colors.at(i));
         }
     }
 
     // Update a palette from a hash of colors.
     inline static void updatePalette(QPalette &palette, const ColorMap &colors)
     {
         for (auto entry : colors) {
             setPaletteColor(palette, ColorRole(entry.first), entry.second);
         }
     }
 
     inline static void setPaletteColor(QPalette &palette, ColorRole role, const QColor &color)
     {
         switch (role) {
         case TextColor:
             palette.setColor(QPalette::Text, color);
             palette.setColor(QPalette::WindowText, color);
             palette.setColor(QPalette::ButtonText, color);
             break;
         case BackgroundColor:
             palette.setColor(QPalette::Window, color);
             palette.setColor(QPalette::Base, color);
             palette.setColor(QPalette::Button, color);
             break;
         case AlternateBackgroundColor:
             palette.setColor(QPalette::AlternateBase, color);
             break;
         case HighlightColor:
             palette.setColor(QPalette::Highlight, color);
             break;
         case HighlightedTextColor:
             palette.setColor(QPalette::HighlightedText, color);
             break;
         case LinkColor:
             palette.setColor(QPalette::Link, color);
             break;
         case VisitedLinkColor:
             palette.setColor(QPalette::LinkVisited, color);
             break;
 
         default:
             break;
         }
     }
 };
 
 class PlatformThemePrivate
 {
 public:
     PlatformThemePrivate()
         : inherit(true)
         , supportsIconColoring(false)
         , pendingColorChange(false)
         , pendingChildUpdate(false)
         , useAlternateBackgroundColor(false)
         , colorSet(PlatformTheme::Window)
         , colorGroup(PlatformTheme::Active)
     {
     }
 
     inline QColor color(const PlatformTheme *theme, PlatformThemeData::ColorRole color) const
     {
         if (!data) {
             return QColor{};
         }
 
         QColor value = data->colors.at(color);
 
         if (data->owner != theme && localOverrides) {
             auto itr = localOverrides->find(color);
             if (itr != localOverrides->end()) {
                 value = itr->second;
             }
         }
 
         return value;
     }
 
     inline void setColor(PlatformTheme *theme, PlatformThemeData::ColorRole color, const QColor &value)
     {
         if (!localOverrides) {
             localOverrides = std::make_unique<PlatformThemeData::ColorMap>();
         }
 
         if (!value.isValid()) {
             // Invalid color, assume we are resetting the value.
             auto itr = localOverrides->find(color);
             if (itr != localOverrides->end()) {
                 localOverrides->erase(itr);
 
                 if (data) {
                     // TODO: Find a better way to determine "default" color.
                     // Right now this sets the color to transparent to force a
                     // color change and relies on the style-specific subclass to
                     // handle resetting the actual color.
                     data->setColor(theme, color, Qt::transparent);
                 }
 
                 emitCompressedColorChanged(theme);
             }
 
             return;
         }
 
         auto itr = localOverrides->find(color);
         if (itr != localOverrides->end() && itr->second == value && (data && data->owner != theme)) {
             return;
         }
 
         (*localOverrides)[color] = value;
 
         if (data) {
             data->setColor(theme, color, value);
         }
 
         emitCompressedColorChanged(theme);
     }
 
     inline void setDataColor(PlatformTheme *theme, PlatformThemeData::ColorRole color, const QColor &value)
     {
         // Only set color if we have no local override of the color.
         // This is done because colorSet/colorGroup changes will trigger most
         // subclasses to reevaluate and reset the colors, breaking any local
         // overrides we have.
         if (localOverrides) {
             auto itr = localOverrides->find(color);
             if (itr != localOverrides->end()) {
                 return;
             }
         }
 
         if (data) {
             data->setColor(theme, color, value);
         }
     }
 
     inline void emitCompressedColorChanged(PlatformTheme *theme)
     {
         if (pendingColorChange) {
             return;
         }
 
         pendingColorChange = true;
         QMetaObject::invokeMethod(theme, &PlatformTheme::emitColorChanged, Qt::QueuedConnection);
     }
 
     inline void queueChildUpdate(PlatformTheme *theme)
     {
         if (pendingChildUpdate) {
             return;
         }
 
         pendingChildUpdate = true;
         QMetaObject::invokeMethod(
             theme,
             [this, theme]() {
                 pendingChildUpdate = false;
                 theme->updateChildren(theme->parent());
             },
             Qt::QueuedConnection);
     }
 
     /*
      * Please note that there is no q pointer. This is intentional, as it avoids
      * having to store that information for each instance of PlatformTheme,
      * saving us 8 bytes per instance. Instead, we pass the theme object as
      * first parameter of each method. This is a little uglier but essentially
      * works the same without needing memory.
      */
 
     // An instance of the data object. This is potentially shared with many
     // instances of PlatformTheme.
     std::shared_ptr<PlatformThemeData> data;
     // Used to store color overrides of inherited data. This is created on
     // demand and will only exist if we actually have local overrides.
     std::unique_ptr<PlatformThemeData::ColorMap> localOverrides;
 
     bool inherit : 1;
     bool supportsIconColoring : 1; // TODO KF6: Remove in favour of virtual method
     bool pendingColorChange : 1;
     bool pendingChildUpdate : 1;
     bool useAlternateBackgroundColor : 1;
 
     // Note: We use these to store local values of PlatformTheme::ColorSet and
     // PlatformTheme::ColorGroup. While these are standard enums and thus 32
     // bits they only contain a few items so we store the value in only 4 bits
     // to save space.
     uint8_t colorSet : 4;
     uint8_t colorGroup : 4;
 
     // Ensure the above assumption holds. Should this static assert fail, the
     // bit size above needs to be adjusted.
     static_assert(PlatformTheme::ColorGroupCount <= 16, "PlatformTheme::ColorGroup contains more elements than can be stored in PlatformThemePrivate");
     static_assert(PlatformTheme::ColorSetCount <= 16, "PlatformTheme::ColorSet contains more elements than can be stored in PlatformThemePrivate");
 
     inline static PlatformPluginFactory *s_pluginFactory = nullptr;
 };
 
 PlatformTheme::PlatformTheme(QObject *parent)
     : QObject(parent)
     , d(new PlatformThemePrivate)
 {
     if (QQuickItem *item = qobject_cast<QQuickItem *>(parent)) {
         connect(item, &QQuickItem::windowChanged, this, &PlatformTheme::update);
         connect(item, &QQuickItem::parentChanged, this, &PlatformTheme::update);
     }
 
     update();
 }
 
 PlatformTheme::~PlatformTheme()
 {
     if (d->data) {
         d->data->removeChangeWatcher(this);
     }
 
     delete d;
 }
 
 void PlatformTheme::setColorSet(PlatformTheme::ColorSet colorSet)
 {
     d->colorSet = colorSet;
 
     if (d->data) {
         d->data->setColorSet(this, colorSet);
     }
 }
 
 PlatformTheme::ColorSet PlatformTheme::colorSet() const
 {
     return d->data ? d->data->colorSet : Window;
 }
 
 void PlatformTheme::setColorGroup(PlatformTheme::ColorGroup colorGroup)
 {
     d->colorGroup = colorGroup;
 
     if (d->data) {
         d->data->setColorGroup(this, colorGroup);
     }
 }
 
 PlatformTheme::ColorGroup PlatformTheme::colorGroup() const
 {
     return d->data ? d->data->colorGroup : Active;
 }
 
 bool PlatformTheme::inherit() const
 {
     return d->inherit;
 }
 
 void PlatformTheme::setInherit(bool inherit)
 {
     if (inherit == d->inherit) {
         return;
     }
 
     d->inherit = inherit;
     update();
 
     Q_EMIT inheritChanged(inherit);
 }
 
 QColor PlatformTheme::textColor() const
 {
     return d->color(this, PlatformThemeData::TextColor);
 }
 
 QColor PlatformTheme::disabledTextColor() const
 {
     return d->color(this, PlatformThemeData::DisabledTextColor);
 }
 
 QColor PlatformTheme::highlightColor() const
 {
     return d->color(this, PlatformThemeData::HighlightColor);
 }
 
 QColor PlatformTheme::highlightedTextColor() const
 {
     return d->color(this, PlatformThemeData::HighlightedTextColor);
 }
 
 QColor PlatformTheme::backgroundColor() const
 {
     return d->color(this, PlatformThemeData::BackgroundColor);
 }
 
 QColor PlatformTheme::alternateBackgroundColor() const
 {
     return d->color(this, PlatformThemeData::AlternateBackgroundColor);
 }
 
 QColor PlatformTheme::activeTextColor() const
 {
     return d->color(this, PlatformThemeData::ActiveTextColor);
 }
 
 QColor PlatformTheme::activeBackgroundColor() const
 {
     return d->color(this, PlatformThemeData::ActiveBackgroundColor);
 }
 
 QColor PlatformTheme::linkColor() const
 {
     return d->color(this, PlatformThemeData::LinkColor);
 }
 
 QColor PlatformTheme::linkBackgroundColor() const
 {
     return d->color(this, PlatformThemeData::LinkBackgroundColor);
 }
 
 QColor PlatformTheme::visitedLinkColor() const
 {
     return d->color(this, PlatformThemeData::VisitedLinkColor);
 }
 
 QColor PlatformTheme::visitedLinkBackgroundColor() const
 {
     return d->color(this, PlatformThemeData::VisitedLinkBackgroundColor);
 }
 
 QColor PlatformTheme::negativeTextColor() const
 {
     return d->color(this, PlatformThemeData::NegativeTextColor);
 }
 
 QColor PlatformTheme::negativeBackgroundColor() const
 {
     return d->color(this, PlatformThemeData::NegativeBackgroundColor);
 }
 
 QColor PlatformTheme::neutralTextColor() const
 {
     return d->color(this, PlatformThemeData::NeutralTextColor);
 }
 
 QColor PlatformTheme::neutralBackgroundColor() const
 {
     return d->color(this, PlatformThemeData::NeutralBackgroundColor);
 }
 
 QColor PlatformTheme::positiveTextColor() const
 {
     return d->color(this, PlatformThemeData::PositiveTextColor);
 }
 
 QColor PlatformTheme::positiveBackgroundColor() const
 {
     return d->color(this, PlatformThemeData::PositiveBackgroundColor);
 }
 
 QColor PlatformTheme::focusColor() const
 {
     return d->color(this, PlatformThemeData::FocusColor);
 }
 
 QColor PlatformTheme::hoverColor() const
 {
     return d->color(this, PlatformThemeData::HoverColor);
 }
 
 // setters for theme implementations
 void PlatformTheme::setTextColor(const QColor &color)
 {
     d->setDataColor(this, PlatformThemeData::TextColor, color);
 }
 
 void PlatformTheme::setDisabledTextColor(const QColor &color)
 {
     d->setDataColor(this, PlatformThemeData::DisabledTextColor, color);
 }
 
 void PlatformTheme::setBackgroundColor(const QColor &color)
 {
     d->setDataColor(this, PlatformThemeData::BackgroundColor, color);
 }
 
 void PlatformTheme::setAlternateBackgroundColor(const QColor &color)
 {
     d->setDataColor(this, PlatformThemeData::AlternateBackgroundColor, color);
 }
 
 void PlatformTheme::setHighlightColor(const QColor &color)
 {
     d->setDataColor(this, PlatformThemeData::HighlightColor, color);
 }
 
 void PlatformTheme::setHighlightedTextColor(const QColor &color)
 {
     d->setDataColor(this, PlatformThemeData::HighlightedTextColor, color);
 }
 
 void PlatformTheme::setActiveTextColor(const QColor &color)
 {
     d->setDataColor(this, PlatformThemeData::ActiveTextColor, color);
 }
 
 void PlatformTheme::setActiveBackgroundColor(const QColor &color)
 {
     d->setDataColor(this, PlatformThemeData::ActiveBackgroundColor, color);
 }
 
 void PlatformTheme::setLinkColor(const QColor &color)
 {
     d->setDataColor(this, PlatformThemeData::LinkColor, color);
 }
 
 void PlatformTheme::setLinkBackgroundColor(const QColor &color)
 {
     d->setDataColor(this, PlatformThemeData::LinkBackgroundColor, color);
 }
 
 void PlatformTheme::setVisitedLinkColor(const QColor &color)
 {
     d->setDataColor(this, PlatformThemeData::VisitedLinkColor, color);
 }
 
 void PlatformTheme::setVisitedLinkBackgroundColor(const QColor &color)
 {
     d->setDataColor(this, PlatformThemeData::VisitedLinkBackgroundColor, color);
 }
 
 void PlatformTheme::setNegativeTextColor(const QColor &color)
 {
     d->setDataColor(this, PlatformThemeData::NegativeTextColor, color);
 }
 
 void PlatformTheme::setNegativeBackgroundColor(const QColor &color)
 {
     d->setDataColor(this, PlatformThemeData::NegativeBackgroundColor, color);
 }
 
 void PlatformTheme::setNeutralTextColor(const QColor &color)
 {
     d->setDataColor(this, PlatformThemeData::NeutralTextColor, color);
 }
 
 void PlatformTheme::setNeutralBackgroundColor(const QColor &color)
 {
     d->setDataColor(this, PlatformThemeData::NeutralBackgroundColor, color);
 }
 
 void PlatformTheme::setPositiveTextColor(const QColor &color)
 {
     d->setDataColor(this, PlatformThemeData::PositiveTextColor, color);
 }
 
 void PlatformTheme::setPositiveBackgroundColor(const QColor &color)
 {
     d->setDataColor(this, PlatformThemeData::PositiveBackgroundColor, color);
 }
 
 void PlatformTheme::setHoverColor(const QColor &color)
 {
     d->setDataColor(this, PlatformThemeData::HoverColor, color);
 }
 
 void PlatformTheme::setFocusColor(const QColor &color)
 {
     d->setDataColor(this, PlatformThemeData::FocusColor, color);
 }
 
 QFont PlatformTheme::defaultFont() const
 {
     return d->data ? d->data->defaultFont : QFont{};
 }
 
 void PlatformTheme::setDefaultFont(const QFont &font)
 {
     if (d->data) {
         d->data->setDefaultFont(this, font);
     }
 }
 
 QFont PlatformTheme::smallFont() const
 {
     return d->data ? d->data->smallFont : QFont{};
 }
 
 void PlatformTheme::setSmallFont(const QFont &font)
 {
     if (d->data) {
         d->data->setSmallFont(this, font);
     }
 }
 
 qreal PlatformTheme::frameContrast() const
 {
     // This value must be kept in sync with
     // the value from Breeze Qt Widget theme.
     // See: https://invent.kde.org/plasma/breeze/-/blob/master/kstyle/breezemetrics.h?ref_type=heads#L162
     return 0.20;
 }
 
 qreal PlatformTheme::lightFrameContrast() const
 {
     // This can be utilized to return full contrast
     // if high contrast accessibility setting is enabled
     return frameContrast() / 2.0;
 }
 
 // setters for QML clients
 void PlatformTheme::setCustomTextColor(const QColor &color)
 {
     d->setColor(this, PlatformThemeData::TextColor, color);
 }
 
 void PlatformTheme::setCustomDisabledTextColor(const QColor &color)
 {
     d->setColor(this, PlatformThemeData::DisabledTextColor, color);
 }
 
 void PlatformTheme::setCustomBackgroundColor(const QColor &color)
 {
     d->setColor(this, PlatformThemeData::BackgroundColor, color);
 }
 
 void PlatformTheme::setCustomAlternateBackgroundColor(const QColor &color)
 {
     d->setColor(this, PlatformThemeData::AlternateBackgroundColor, color);
 }
 
 void PlatformTheme::setCustomHighlightColor(const QColor &color)
 {
     d->setColor(this, PlatformThemeData::HighlightColor, color);
 }
 
 void PlatformTheme::setCustomHighlightedTextColor(const QColor &color)
 {
     d->setColor(this, PlatformThemeData::HighlightedTextColor, color);
 }
 
 void PlatformTheme::setCustomActiveTextColor(const QColor &color)
 {
     d->setColor(this, PlatformThemeData::ActiveTextColor, color);
 }
 
 void PlatformTheme::setCustomActiveBackgroundColor(const QColor &color)
 {
     d->setColor(this, PlatformThemeData::ActiveBackgroundColor, color);
 }
 
 void PlatformTheme::setCustomLinkColor(const QColor &color)
 {
     d->setColor(this, PlatformThemeData::LinkColor, color);
 }
 
 void PlatformTheme::setCustomLinkBackgroundColor(const QColor &color)
 {
     d->setColor(this, PlatformThemeData::LinkBackgroundColor, color);
 }
 
 void PlatformTheme::setCustomVisitedLinkColor(const QColor &color)
 {
     d->setColor(this, PlatformThemeData::TextColor, color);
 }
 
 void PlatformTheme::setCustomVisitedLinkBackgroundColor(const QColor &color)
 {
     d->setColor(this, PlatformThemeData::VisitedLinkBackgroundColor, color);
 }
 
 void PlatformTheme::setCustomNegativeTextColor(const QColor &color)
 {
     d->setColor(this, PlatformThemeData::NegativeTextColor, color);
 }
 
 void PlatformTheme::setCustomNegativeBackgroundColor(const QColor &color)
 {
     d->setColor(this, PlatformThemeData::NegativeBackgroundColor, color);
 }
 
 void PlatformTheme::setCustomNeutralTextColor(const QColor &color)
 {
     d->setColor(this, PlatformThemeData::NeutralTextColor, color);
 }
 
 void PlatformTheme::setCustomNeutralBackgroundColor(const QColor &color)
 {
     d->setColor(this, PlatformThemeData::NeutralBackgroundColor, color);
 }
 
 void PlatformTheme::setCustomPositiveTextColor(const QColor &color)
 {
     d->setColor(this, PlatformThemeData::PositiveTextColor, color);
 }
 
 void PlatformTheme::setCustomPositiveBackgroundColor(const QColor &color)
 {
     d->setColor(this, PlatformThemeData::PositiveBackgroundColor, color);
 }
 
 void PlatformTheme::setCustomHoverColor(const QColor &color)
 {
     d->setColor(this, PlatformThemeData::HoverColor, color);
 }
 
 void PlatformTheme::setCustomFocusColor(const QColor &color)
 {
     d->setColor(this, PlatformThemeData::FocusColor, color);
 }
 
 bool PlatformTheme::useAlternateBackgroundColor() const
 {
     return d->useAlternateBackgroundColor;
 }
 
 void PlatformTheme::setUseAlternateBackgroundColor(bool alternate)
 {
     if (alternate == d->useAlternateBackgroundColor) {
         return;
     }
 
     d->useAlternateBackgroundColor = alternate;
     Q_EMIT useAlternateBackgroundColorChanged(alternate);
 }
 
 QPalette PlatformTheme::palette() const
 {
     if (!d->data) {
         return QPalette{};
     }
 
     auto palette = d->data->palette;
 
     if (d->localOverrides) {
         PlatformThemeData::updatePalette(palette, *d->localOverrides);
     }
 
     return palette;
 }
 
 QIcon PlatformTheme::iconFromTheme(const QString &name, const QColor &customColor)
 {
     Q_UNUSED(customColor);
     QIcon icon = QIcon::fromTheme(name);
     return icon;
 }
 
 bool PlatformTheme::supportsIconColoring() const
 {
     return d->supportsIconColoring;
 }
 
 void PlatformTheme::setSupportsIconColoring(bool support)
 {
     d->supportsIconColoring = support;
 }
 
 PlatformTheme *PlatformTheme::qmlAttachedProperties(QObject *object)
 {
     QQmlEngine *engine = qmlEngine(object);
     QString pluginName;
 
     if (engine) {
         pluginName = engine->property("_kirigamiTheme").toString();
     }
 
     auto plugin = PlatformPluginFactory::findPlugin(pluginName);
     if (!plugin && !pluginName.isEmpty()) {
         plugin = PlatformPluginFactory::findPlugin();
     }
 
     if (plugin) {
         if (auto theme = plugin->createPlatformTheme(object)) {
             return theme;
         }
     }
 
     return new BasicTheme(object);
 }
 
 bool PlatformTheme::event(QEvent *event)
 {
     if (event->type() == PlatformThemeEvents::DataChangedEvent::type) {
         auto changeEvent = static_cast<PlatformThemeEvents::DataChangedEvent *>(event);
 
         if (changeEvent->sender != this) {
             return false;
         }
 
         if (changeEvent->oldValue) {
             changeEvent->oldValue->removeChangeWatcher(this);
         }
 
         if (changeEvent->newValue) {
             auto data = changeEvent->newValue;
             data->addChangeWatcher(this);
 
             Q_EMIT colorSetChanged(data->colorSet);
             Q_EMIT colorGroupChanged(data->colorGroup);
             Q_EMIT defaultFontChanged(data->defaultFont);
             Q_EMIT smallFontChanged(data->smallFont);
             d->emitCompressedColorChanged(this);
         }
 
         return true;
     }
 
     if (event->type() == PlatformThemeEvents::ColorSetChangedEvent::type) {
         if (d->data) {
             Q_EMIT colorSetChanged(d->data->colorSet);
         }
         return true;
     }
 
     if (event->type() == PlatformThemeEvents::ColorGroupChangedEvent::type) {
         if (d->data) {
             Q_EMIT colorGroupChanged(d->data->colorGroup);
         }
         return true;
     }
 
     if (event->type() == PlatformThemeEvents::ColorChangedEvent::type) {
         d->emitCompressedColorChanged(this);
         return true;
     }
 
     if (event->type() == PlatformThemeEvents::FontChangedEvent::type) {
         if (d->data) {
             Q_EMIT defaultFontChanged(d->data->defaultFont);
             Q_EMIT smallFontChanged(d->data->smallFont);
         }
         return true;
     }
 
     return QObject::event(event);
 }
 
 void PlatformTheme::update()
 {
     d->queueChildUpdate(this);
 
     auto oldData = d->data;
 
     if (d->inherit) {
         QObject *candidate = parent();
         while (true) {
             candidate = determineParent(candidate);
             if (!candidate) {
                 break;
             }
 
             auto t = static_cast<PlatformTheme *>(qmlAttachedPropertiesObject<PlatformTheme>(candidate, false));
             if (t && t->d->data && t->d->data->owner == t) {
                 if (d->data == t->d->data) {
                     // Inheritance is already correct, do nothing.
                     return;
                 }
 
                 d->data = t->d->data;
 
                 PlatformThemeEvents::DataChangedEvent event{this, oldData, t->d->data};
                 QCoreApplication::sendEvent(this, &event);
 
                 return;
             }
         }
     } else if (d->data->owner != this) {
         // Inherit has changed and we no longer want to inherit, clear the data
         // so it is recreated below.
         d->data = nullptr;
     }
 
     if (!d->data) {
         d->data = std::make_shared<PlatformThemeData>();
         d->data->owner = this;
         d->data->setColorSet(this, static_cast<ColorSet>(d->colorSet));
         d->data->setColorGroup(this, static_cast<ColorGroup>(d->colorGroup));
     }
 
     if (d->localOverrides) {
         for (auto entry : *d->localOverrides) {
             d->data->setColor(this, PlatformThemeData::ColorRole(entry.first), entry.second);
         }
     }
 
     PlatformThemeEvents::DataChangedEvent event{this, oldData, d->data};
     QCoreApplication::sendEvent(this, &event);
 }
 
 void PlatformTheme::updateChildren(QObject *object)
 {
     if (!object) {
         return;
     }
 
     const auto children = object->children();
     for (auto child : children) {
         auto t = static_cast<PlatformTheme *>(qmlAttachedPropertiesObject<PlatformTheme>(child, false));
         if (t) {
             t->update();
         } else {
             updateChildren(child);
         }
     }
 }
 
 void PlatformTheme::emitColorChanged()
 {
     if (d->data) {
         Q_EMIT paletteChanged(d->data->palette);
     }
 
     Q_EMIT colorsChanged();
     d->pendingColorChange = false;
 }
 
 // We sometimes set theme properties on non-visual objects. However, if an item
 // has a visual and a non-visual parent that are different, we should prefer the
 // visual parent, so we need to apply some extra logic.
 QObject *PlatformTheme::determineParent(QObject *object)
 {
     if (!object) {
         return nullptr;
     }
 
     auto item = qobject_cast<QQuickItem *>(object);
     if (item) {
         return item->parentItem();
     } else {
         return object->parent();
     }
 }
 
 }
 }
 
 #include "moc_platformtheme.cpp"
 #include "platformtheme.moc"