Warning, file /plasma/oxygen/kdecoration/oxygendecoration.cpp was not indexed or was modified since last indexation (in which case cross-reference links may be missing, inaccurate or erroneous).

 /*
     SPDX-FileCopyrightText: 2014 Martin Gräßlin <mgraesslin@kde.org>
     SPDX-FileCopyrightText: 2014 Hugo Pereira Da Costa <hugo.pereira@free.fr>
     SPDX-FileCopyrightText: 2015 David Edmundson <davidedmundson@kde.org>
 
     SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
 */
 
 #include "oxygendecoration.h"
 
 #include "config-oxygen.h"
 #include "config/oxygenconfigwidget.h"
 #include "oxygensettingsprovider.h"
 #include "oxygenshadowcache.h"
 
 #include "oxygenbutton.h"
 #include "oxygensizegrip.h"
 
 #include <KDecoration2/DecorationButtonGroup>
 #include <KDecoration2/DecorationShadow>
 
 #include <KColorUtils>
 #include <KConfigGroup>
 #include <KPluginFactory>
 #include <KSharedConfig>
 
 #include <QPainter>
 #include <QTextStream>
 #include <QTimer>
 
 #if OXYGEN_HAVE_X11
 #if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
 #include <QX11Info>
 #else
 #include <private/qtx11extras_p.h>
 #endif
 #endif
 
 K_PLUGIN_FACTORY_WITH_JSON(OxygenDecoFactory, "oxygen.json", registerPlugin<Oxygen::Decoration>(); registerPlugin<Oxygen::Button>();
                            registerPlugin<Oxygen::ConfigWidget>();)
 
 namespace Oxygen
 {
 
 using KDecoration2::ColorGroup;
 using KDecoration2::ColorRole;
 
 //________________________________________________________________
 using DecorationShadowPointer = QSharedPointer<KDecoration2::DecorationShadow>;
 using ShadowMap = QHash<int, DecorationShadowPointer>;
 
 static int g_sDecoCount = 0;
 static ShadowMap g_sShadows;
 
 Decoration::Decoration(QObject *parent, const QVariantList &args)
     : KDecoration2::Decoration(parent, args)
     , m_animation(new QPropertyAnimation(this))
 {
     g_sDecoCount++;
 }
 
 //________________________________________________________________
 Decoration::~Decoration()
 {
     g_sDecoCount--;
     if (g_sDecoCount == 0)
         g_sShadows.clear();
 
     deleteSizeGrip();
 }
 
 //________________________________________________________________
 void Decoration::setOpacity(qreal value)
 {
     if (m_opacity == value)
         return;
     m_opacity = value;
     updateShadow();
     update();
 
     if (m_sizeGrip)
         m_sizeGrip->update();
 }
 
 //_________________________________________________________
 QColor Decoration::titleBarColor(const QPalette &palette) const
 {
     if (m_animation->state() == QPropertyAnimation::Running) {
         return KColorUtils::mix(titleBarColor(palette, false), titleBarColor(palette, true), m_opacity);
 
     } else {
         return titleBarColor(palette, client().toStrongRef()->isActive());
     }
 }
 
 //_________________________________________________________
 QColor Decoration::titleBarColor(const QPalette &palette, bool active) const
 {
     if (m_internalSettings->useWindowColors()) {
         return palette.color(active ? QPalette::Active : QPalette::Inactive, QPalette::Window);
 
     } else {
         return client().toStrongRef()->color(active ? ColorGroup::Active : ColorGroup::Inactive, ColorRole::TitleBar);
     }
 }
 
 //_________________________________________________________
 QColor Decoration::fontColor(const QPalette &palette) const
 {
     if (hideTitleBar())
         return fontColor(palette, false);
     if (m_animation->state() == QPropertyAnimation::Running) {
         return KColorUtils::mix(fontColor(palette, false), fontColor(palette, true), m_opacity);
 
     } else {
         return fontColor(palette, client().toStrongRef()->isActive());
     }
 }
 
 //_________________________________________________________
 QColor Decoration::fontColor(const QPalette &palette, bool active) const
 {
     if (m_internalSettings->useWindowColors()) {
         return palette.color(active ? QPalette::Active : QPalette::Disabled, QPalette::WindowText);
 
     } else {
         return client().toStrongRef()->color(active ? ColorGroup::Active : ColorGroup::Inactive, ColorRole::Foreground);
     }
 }
 
 //_________________________________________________________
 QColor Decoration::contrastColor(const QPalette &palette) const
 {
     if (m_internalSettings->useWindowColors())
         return contrastColor(palette.color(QPalette::Window));
     else {
         const auto cl = client().toStrongRef();
         return contrastColor(cl->color(cl->isActive() ? ColorGroup::Active : ColorGroup::Inactive, ColorRole::TitleBar));
     }
 }
 
 //_________________________________________________________
 QColor Decoration::contrastColor(const QColor &color) const
 {
     return SettingsProvider::self()->helper()->calcLightColor(color);
 }
 
 //________________________________________________________________
 void Decoration::init()
 {
     // active state change animation
     m_animation->setStartValue(0);
     m_animation->setEndValue(1.0);
     m_animation->setTargetObject(this);
     m_animation->setPropertyName("opacity");
     m_animation->setEasingCurve(QEasingCurve::InOutQuad);
 
     reconfigure();
     updateTitleBar();
     auto s = settings();
     connect(s.data(), &KDecoration2::DecorationSettings::borderSizeChanged, this, &Decoration::recalculateBorders);
 
     // a change in font might cause the borders to change
     connect(s.data(), &KDecoration2::DecorationSettings::fontChanged, this, &Decoration::recalculateBorders);
     connect(s.data(), &KDecoration2::DecorationSettings::spacingChanged, this, &Decoration::recalculateBorders);
 
     // buttons
     connect(s.data(), &KDecoration2::DecorationSettings::spacingChanged, this, &Decoration::updateButtonsGeometryDelayed);
     connect(s.data(), &KDecoration2::DecorationSettings::decorationButtonsLeftChanged, this, &Decoration::updateButtonsGeometryDelayed);
     connect(s.data(), &KDecoration2::DecorationSettings::decorationButtonsRightChanged, this, &Decoration::updateButtonsGeometryDelayed);
 
     // full reconfiguration
     connect(s.data(), &KDecoration2::DecorationSettings::reconfigured, this, &Decoration::reconfigure);
     connect(s.data(), &KDecoration2::DecorationSettings::reconfigured, SettingsProvider::self(), &SettingsProvider::reconfigure, Qt::UniqueConnection);
 
     const auto *cl = client().toStrongRef().data();
     connect(cl, &KDecoration2::DecoratedClient::adjacentScreenEdgesChanged, this, &Decoration::recalculateBorders);
     connect(cl, &KDecoration2::DecoratedClient::maximizedHorizontallyChanged, this, &Decoration::recalculateBorders);
     connect(cl, &KDecoration2::DecoratedClient::maximizedVerticallyChanged, this, &Decoration::recalculateBorders);
     connect(cl, &KDecoration2::DecoratedClient::captionChanged, this, [this]() {
         // update the caption area
         update(titleBar());
     });
 
     connect(cl, &KDecoration2::DecoratedClient::activeChanged, this, &Decoration::updateAnimationState);
     connect(cl, &KDecoration2::DecoratedClient::activeChanged, this, &Decoration::updateShadow);
 
     // decoration has an overloaded update function, force the compiler to choose the right one
     connect(cl, &KDecoration2::DecoratedClient::paletteChanged, this, static_cast<void (Decoration::*)()>(&Decoration::update));
     connect(cl, &KDecoration2::DecoratedClient::widthChanged, this, &Decoration::updateTitleBar);
     connect(cl, &KDecoration2::DecoratedClient::maximizedChanged, this, &Decoration::updateTitleBar);
     connect(cl, &KDecoration2::DecoratedClient::maximizedChanged, this, &Decoration::setOpaque);
 
     connect(cl, &KDecoration2::DecoratedClient::widthChanged, this, &Decoration::updateButtonsGeometry);
     connect(cl, &KDecoration2::DecoratedClient::maximizedChanged, this, &Decoration::updateButtonsGeometry);
     connect(cl, &KDecoration2::DecoratedClient::shadedChanged, this, &Decoration::recalculateBorders);
     connect(cl, &KDecoration2::DecoratedClient::shadedChanged, this, &Decoration::updateButtonsGeometry);
 
     createButtons();
     updateShadow();
 }
 
 //________________________________________________________________
 void Decoration::updateTitleBar()
 {
     auto s = settings();
     const bool maximized = isMaximized();
     const auto clientPtr = client().toStrongRef();
     const int width = maximized ? clientPtr->width() : clientPtr->width() - 2 * s->largeSpacing() * Metrics::TitleBar_SideMargin;
     const int height = maximized ? borderTop() : borderTop() - s->smallSpacing() * Metrics::TitleBar_TopMargin;
     const int x = maximized ? 0 : s->largeSpacing() * Metrics::TitleBar_SideMargin;
     const int y = maximized ? 0 : s->smallSpacing() * Metrics::TitleBar_TopMargin;
     setTitleBar(QRect(x, y, width, height));
 }
 
 //________________________________________________________________
 void Decoration::updateAnimationState()
 {
     if (m_internalSettings->animationsEnabled()) {
         m_animation->setDirection(client().toStrongRef()->isActive() ? QPropertyAnimation::Forward : QPropertyAnimation::Backward);
         if (m_animation->state() != QPropertyAnimation::Running)
             m_animation->start();
 
     } else {
         update();
     }
 }
 
 //________________________________________________________________
 void Decoration::updateSizeGripVisibility()
 {
     const auto c = client().toStrongRef();
     if (m_sizeGrip) {
         m_sizeGrip->setVisible(c->isResizeable() && !isMaximized() && !c->isShaded());
     }
 }
 
 //________________________________________________________________
 int Decoration::borderSize(bool bottom) const
 {
     const int baseSize = settings()->smallSpacing();
     if (m_internalSettings && (m_internalSettings->mask() & BorderSize)) {
         switch (m_internalSettings->borderSize()) {
         case InternalSettings::BorderNone:
             return 0;
         case InternalSettings::BorderNoSides:
             return bottom ? qMax(4, baseSize) : 0;
         default:
         case InternalSettings::BorderTiny:
             return bottom ? qMax(4, baseSize) : baseSize;
         case InternalSettings::BorderNormal:
             return baseSize * 2;
         case InternalSettings::BorderLarge:
             return baseSize * 3;
         case InternalSettings::BorderVeryLarge:
             return baseSize * 4;
         case InternalSettings::BorderHuge:
             return baseSize * 5;
         case InternalSettings::BorderVeryHuge:
             return baseSize * 6;
         case InternalSettings::BorderOversized:
             return baseSize * 10;
         }
 
     } else {
         switch (settings()->borderSize()) {
         case KDecoration2::BorderSize::None:
             return 0;
         case KDecoration2::BorderSize::NoSides:
             return bottom ? qMax(4, baseSize) : 0;
         default:
         case KDecoration2::BorderSize::Tiny:
             return bottom ? qMax(4, baseSize) : baseSize;
         case KDecoration2::BorderSize::Normal:
             return baseSize * 2;
         case KDecoration2::BorderSize::Large:
             return baseSize * 3;
         case KDecoration2::BorderSize::VeryLarge:
             return baseSize * 4;
         case KDecoration2::BorderSize::Huge:
             return baseSize * 5;
         case KDecoration2::BorderSize::VeryHuge:
             return baseSize * 6;
         case KDecoration2::BorderSize::Oversized:
             return baseSize * 10;
         }
     }
 }
 
 //________________________________________________________________
 void Decoration::reconfigure()
 {
     m_internalSettings = SettingsProvider::self()->internalSettings(this);
 
     // animation
     m_animation->setDuration(m_internalSettings->shadowAnimationsDuration());
 
     // borders
     recalculateBorders();
 
     // clear shadows
     g_sShadows.clear();
 
     // size grip
     if (hasNoBorders() && m_internalSettings->drawSizeGrip())
         createSizeGrip();
     else
         deleteSizeGrip();
 }
 
 //________________________________________________________________
 void Decoration::recalculateBorders()
 {
     auto s = settings();
     const auto c = client().toStrongRef();
     const auto edges = c->adjacentScreenEdges();
 
     // left, right and bottom borders
     auto testFlag = [&](Qt::Edge edge) {
         return edges.testFlag(edge) && !m_internalSettings->drawBorderOnMaximizedWindows();
     };
     const int left = isMaximizedHorizontally() || testFlag(Qt::LeftEdge) ? 0 : borderSize();
     const int right = isMaximizedHorizontally() || testFlag(Qt::RightEdge) ? 0 : borderSize();
     const int bottom = isMaximizedVertically() || c->isShaded() || testFlag(Qt::BottomEdge) ? 0 : borderSize(true);
 
     int top = 0;
     if (hideTitleBar())
         top = bottom;
     else {
         QFontMetrics fm(s->font());
         top += qMax(fm.height(), buttonHeight());
 
         // padding below
         const int baseSize = s->smallSpacing();
         top += baseSize * Metrics::TitleBar_BottomMargin;
 
         // padding above
         top += baseSize * TitleBar_TopMargin;
     }
 
     setBorders(QMargins(left, top, right, bottom));
 
     // extended sizes
     const int extSize = s->largeSpacing();
     int extSides = 0;
     int extBottom = 0;
     if (hasNoBorders()) {
         if (!isMaximizedHorizontally())
             extSides = extSize;
         if (!isMaximizedVertically())
             extBottom = extSize;
 
     } else if (hasNoSideBorders() && !isMaximizedHorizontally()) {
         extSides = extSize;
     }
 
     setResizeOnlyBorders(QMargins(extSides, 0, extSides, extBottom));
 }
 
 //________________________________________________________________
 void Decoration::createButtons()
 {
     m_leftButtons = new KDecoration2::DecorationButtonGroup(KDecoration2::DecorationButtonGroup::Position::Left, this, &Button::create);
     m_rightButtons = new KDecoration2::DecorationButtonGroup(KDecoration2::DecorationButtonGroup::Position::Right, this, &Button::create);
     updateButtonsGeometry();
 }
 
 //________________________________________________________________
 void Decoration::updateButtonsGeometryDelayed()
 {
     QTimer::singleShot(0, this, &Decoration::updateButtonsGeometry);
 }
 
 //________________________________________________________________
 void Decoration::updateButtonsGeometry()
 {
     auto s = settings();
 
     // adjust button position
     const int bHeight = captionHeight() + (isMaximized() ? s->smallSpacing() * Metrics::TitleBar_TopMargin : 0);
     const int bWidth = buttonHeight();
     const int verticalOffset = (isMaximized() ? s->smallSpacing() * Metrics::TitleBar_TopMargin : 0) + (captionHeight() - buttonHeight()) / 2;
 
     const QVector<QPointer<KDecoration2::DecorationButton>> leftButtons = m_leftButtons->buttons();
     const QVector<QPointer<KDecoration2::DecorationButton>> rightButtons = m_rightButtons->buttons();
 
     const auto allButtons = leftButtons + rightButtons;
     for (const auto &button : allButtons) {
         button.data()->setGeometry(QRectF(QPoint(0, 0), QSizeF(bWidth, bHeight)));
         static_cast<Button *>(button.data())->setOffset(QPointF(0, verticalOffset));
         static_cast<Button *>(button.data())->setIconSize(QSize(bWidth, bWidth));
     }
 
     // left buttons
     if (!leftButtons.isEmpty()) {
         // spacing
         m_leftButtons->setSpacing(s->smallSpacing() * Metrics::TitleBar_ButtonSpacing);
 
         // padding
         const int vPadding = isMaximized() ? 0 : s->smallSpacing() * Metrics::TitleBar_TopMargin;
         const int hPadding = s->smallSpacing() * Metrics::TitleBar_SideMargin;
         if (isMaximizedHorizontally()) {
             // add offsets on the side buttons, to preserve padding, but satisfy Fitts law
             auto button = static_cast<Button *>(leftButtons.front().data());
             button->setGeometry(QRectF(QPoint(0, 0), QSizeF(bWidth + hPadding, bHeight)));
             button->setFlag(Button::FlagFirstInList);
             button->setHorizontalOffset(hPadding);
 
             m_leftButtons->setPos(QPointF(0, vPadding));
 
         } else
             m_leftButtons->setPos(QPointF(hPadding + borderLeft(), vPadding));
     }
 
     // right buttons
     if (!rightButtons.isEmpty()) {
         // spacing
         m_rightButtons->setSpacing(s->smallSpacing() * Metrics::TitleBar_ButtonSpacing);
 
         // padding
         const int vPadding = isMaximized() ? 0 : s->smallSpacing() * Metrics::TitleBar_TopMargin;
         const int hPadding = s->smallSpacing() * Metrics::TitleBar_SideMargin;
         if (isMaximizedHorizontally()) {
             auto button = static_cast<Button *>(rightButtons.back().data());
             button->setGeometry(QRectF(QPoint(0, 0), QSizeF(bWidth + hPadding, bHeight)));
             button->setFlag(Button::FlagLastInList);
 
             m_rightButtons->setPos(QPointF(size().width() - m_rightButtons->geometry().width(), vPadding));
 
         } else
             m_rightButtons->setPos(QPointF(size().width() - m_rightButtons->geometry().width() - hPadding - borderRight(), vPadding));
     }
 
     update();
 }
 
 //________________________________________________________________
 void Decoration::paint(QPainter *painter, const QRect &repaintRegion)
 {
     const auto c = client().toStrongRef();
     const auto palette = c->palette();
 
     const auto rect = c->isShaded() ? QRect(QPoint(0, 0), QSize(size().width(), borderTop())) : this->rect();
     renderWindowBorder(painter, rect, palette);
     if (!isMaximized())
         renderCorners(painter, rect, palette);
 
     if (!hideTitleBar()) {
         m_leftButtons->paint(painter, repaintRegion);
         m_rightButtons->paint(painter, repaintRegion);
 
         renderTitleText(painter, palette);
     }
 }
 
 //________________________________________________________________
 int Decoration::buttonHeight() const
 {
     const int baseSize = settings()->gridUnit() + 2; // oxygen icons were always slightly larger
     switch (m_internalSettings->buttonSize()) {
     case InternalSettings::ButtonSmall:
         return baseSize * 1.5;
     default:
     case InternalSettings::ButtonDefault:
         return baseSize * 2;
     case InternalSettings::ButtonLarge:
         return baseSize * 2.5;
     case InternalSettings::ButtonVeryLarge:
         return baseSize * 3.5;
     }
 }
 
 //________________________________________________________________
 int Decoration::captionHeight() const
 {
     return hideTitleBar() ? borderTop() : borderTop() - settings()->smallSpacing() * (Metrics::TitleBar_BottomMargin + Metrics::TitleBar_TopMargin);
 }
 
 //________________________________________________________________
 QPair<QRect, Qt::Alignment> Decoration::captionRect() const
 {
     if (hideTitleBar())
         return qMakePair(QRect(), Qt::AlignCenter);
     else {
         const int leftOffset = m_leftButtons->buttons().isEmpty()
             ? Metrics::TitleBar_SideMargin * settings()->smallSpacing()
             : m_leftButtons->geometry().x() + m_leftButtons->geometry().width() + Metrics::TitleBar_SideMargin * settings()->smallSpacing();
 
         const int rightOffset = m_rightButtons->buttons().isEmpty()
             ? Metrics::TitleBar_SideMargin * settings()->smallSpacing()
             : size().width() - m_rightButtons->geometry().x() + Metrics::TitleBar_SideMargin * settings()->smallSpacing();
 
         const int yOffset = settings()->smallSpacing() * Metrics::TitleBar_TopMargin;
         const QRect maxRect(leftOffset, yOffset, size().width() - leftOffset - rightOffset, captionHeight());
 
         switch (m_internalSettings->titleAlignment()) {
         case InternalSettings::AlignLeft:
             return qMakePair(maxRect, Qt::AlignVCenter | Qt::AlignLeft);
 
         case InternalSettings::AlignRight:
             return qMakePair(maxRect, Qt::AlignVCenter | Qt::AlignRight);
 
         case InternalSettings::AlignCenter:
             return qMakePair(maxRect, Qt::AlignCenter);
 
         default:
         case InternalSettings::AlignCenterFullWidth: {
             // full caption rect
             const QRect fullRect = QRect(0, yOffset, size().width(), captionHeight());
             QRect boundingRect(settings()->fontMetrics().boundingRect(client().toStrongRef()->caption()).toRect());
 
             // text bounding rect
             boundingRect.setTop(yOffset);
             boundingRect.setHeight(captionHeight());
             boundingRect.moveLeft((size().width() - boundingRect.width()) / 2);
 
             if (boundingRect.left() < leftOffset)
                 return qMakePair(maxRect, Qt::AlignVCenter | Qt::AlignLeft);
             else if (boundingRect.right() > size().width() - rightOffset)
                 return qMakePair(maxRect, Qt::AlignVCenter | Qt::AlignRight);
             else
                 return qMakePair(fullRect, Qt::AlignCenter);
         }
         }
     }
 }
 
 //________________________________________________________________
 void Decoration::updateShadow()
 {
     // do nothing if palettes are disabled
     if (!(SettingsProvider::self()->shadowCache()->isEnabled(QPalette::Active) || SettingsProvider::self()->shadowCache()->isEnabled(QPalette::Inactive))) {
         return;
     }
 
     // see if shadow should be animated
     const bool animated(m_animation->state() == QPropertyAnimation::Running && SettingsProvider::self()->shadowCache()->isEnabled(QPalette::Active)
                         && SettingsProvider::self()->shadowCache()->isEnabled(QPalette::Inactive));
 
     // generate key
     ShadowCache::Key key;
     const auto clientPtr = client().toStrongRef();
     key.active = SettingsProvider::self()->shadowCache()->isEnabled(QPalette::Active) && clientPtr->isActive();
     key.isShade = clientPtr->isShaded();
     key.hasBorder = !hasNoBorders();
 
     if (animated) {
         static const int maxIndex = 255;
         key.index = m_opacity * maxIndex;
     }
 
     const int hash(key.hash());
 
     // find key in map
     auto iter = g_sShadows.find(hash);
     if (iter == g_sShadows.end()) {
         auto decorationShadow = DecorationShadowPointer::create();
         QPixmap shadowPixmap =
             animated ? SettingsProvider::self()->shadowCache()->animatedPixmap(key, m_opacity) : SettingsProvider::self()->shadowCache()->pixmap(key);
 
         const int shadowSize(shadowPixmap.width() / 2);
         const int overlap = 4;
         decorationShadow->setPadding(QMargins(shadowSize - overlap, shadowSize - overlap, shadowSize - overlap, shadowSize - overlap));
         decorationShadow->setInnerShadowRect(QRect(shadowSize, shadowSize, 1, 1));
         decorationShadow->setShadow(shadowPixmap.toImage());
 
         iter = g_sShadows.insert(hash, decorationShadow);
     }
 
     setShadow(iter.value());
 }
 
 //_________________________________________________________
 void Decoration::renderCorners(QPainter *painter, const QRect &frame, const QPalette &palette) const
 {
     const QColor color(titleBarColor(palette));
 
     QLinearGradient lg = QLinearGradient(0, -0.5, 0, qreal(frame.height()) + 0.5);
     lg.setColorAt(0.0, SettingsProvider::self()->helper()->calcLightColor(SettingsProvider::self()->helper()->backgroundTopColor(color)));
     lg.setColorAt(0.51, SettingsProvider::self()->helper()->backgroundBottomColor(color));
     lg.setColorAt(1.0, SettingsProvider::self()->helper()->backgroundBottomColor(color));
 
     painter->setPen(QPen(lg, 1));
     painter->setBrush(Qt::NoBrush);
     painter->drawRoundedRect(QRectF(frame).adjusted(0.5, 0.5, -0.5, -0.5), 3.5, 3.5);
 }
 
 //_________________________________________________________
 void Decoration::renderWindowBackground(QPainter *painter, const QRect &clipRect, const QPalette &palette) const
 {
     const auto c = client().toStrongRef();
     auto innerClientRect = c->isShaded() ? QRect(QPoint(0, 0), QSize(size().width(), borderTop())) : rect();
 
     // size of window minus the outlines for the rounded corners
     if (settings()->isAlphaChannelSupported() && !isMaximized()) {
         innerClientRect.adjust(1, 1, -1, -1);
     }
 
     if (SettingsProvider::self()->helper()->hasBackgroundGradient(c->windowId())) {
         SettingsProvider::self()->helper()->renderWindowBackground(painter, clipRect, innerClientRect, titleBarColor(palette), borderTop() - 24);
 
     } else {
         painter->fillRect(innerClientRect, titleBarColor(palette));
     }
 }
 
 //_________________________________________________________
 void Decoration::renderWindowBorder(QPainter *painter, const QRect &clipRect, const QPalette &palette) const
 {
     // save painter
     if (clipRect.isValid()) {
         painter->save();
         painter->setClipRegion(clipRect, Qt::IntersectClip);
     }
 
     // title height
     renderWindowBackground(painter, clipRect, palette);
 
     // restore painter
     if (clipRect.isValid()) {
         painter->restore();
     }
 }
 
 //_________________________________________________________
 void Decoration::renderTitleText(QPainter *painter, const QPalette &palette) const
 {
     // setup font
     painter->setFont(settings()->font());
 
     // caption rect
     const auto cR = captionRect();
 
     // copy caption
     const QString caption = painter->fontMetrics().elidedText(client().toStrongRef()->caption(), Qt::ElideMiddle, cR.first.width());
 
     const auto contrast(contrastColor(palette));
     if (contrast.isValid()) {
         painter->setPen(contrast);
         painter->translate(0, 1);
         painter->drawText(cR.first, cR.second | Qt::TextSingleLine, caption);
         painter->translate(0, -1);
     }
 
     const auto color(fontColor(palette));
     painter->setPen(color);
     painter->drawText(cR.first, cR.second | Qt::TextSingleLine, caption);
 }
 
 //_________________________________________________________________
 void Decoration::createSizeGrip(void)
 {
     // do nothing if size grip already exist
     if (m_sizeGrip)
         return;
 
 #if OXYGEN_HAVE_X11
     if (!QX11Info::isPlatformX11())
         return;
 
     // access client
     const auto clientPtr = client().toStrongRef();
     if (!clientPtr)
         return;
 
     if (clientPtr->windowId() != 0) {
         m_sizeGrip = new SizeGrip(this);
         const auto *clientP = clientPtr.data();
         connect(clientP, &KDecoration2::DecoratedClient::maximizedChanged, this, &Decoration::updateSizeGripVisibility);
         connect(clientP, &KDecoration2::DecoratedClient::shadedChanged, this, &Decoration::updateSizeGripVisibility);
         connect(clientP, &KDecoration2::DecoratedClient::resizeableChanged, this, &Decoration::updateSizeGripVisibility);
     }
 #endif
 }
 
 //_________________________________________________________________
 void Decoration::deleteSizeGrip(void)
 {
     if (m_sizeGrip) {
         m_sizeGrip->deleteLater();
         m_sizeGrip = nullptr;
     }
 }
 
 } // namespace
 
 #include "oxygendecoration.moc"