File indexing completed on 2024-04-28 16:44:34

 /*
  * SPDX-FileCopyrightText: 2014 Martin Gräßlin <mgraesslin@kde.org>
  *
  * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 #include "decorationbuttongroup.h"
 #include "decoration.h"
 #include "decorationbuttongroup_p.h"
 #include "decorationsettings.h"
 
 #include <QDebug>
 #include <QGuiApplication>
 
 namespace KDecoration2
 {
 DecorationButtonGroup::Private::Private(Decoration *decoration, DecorationButtonGroup *parent)
     : decoration(decoration)
     , spacing(0.0)
     , q(parent)
 {
 }
 
 DecorationButtonGroup::Private::~Private() = default;
 
 void DecorationButtonGroup::Private::setGeometry(const QRectF &geo)
 {
     if (geometry == geo) {
         return;
     }
     geometry = geo;
     Q_EMIT q->geometryChanged(geometry);
 }
 
 namespace
 {
 static bool s_layoutRecursion = false;
 }
 
 void DecorationButtonGroup::Private::updateLayout()
 {
     if (s_layoutRecursion) {
         return;
     }
     s_layoutRecursion = true;
     const QPointF &pos = geometry.topLeft();
     // first calculate new size
     qreal height = 0;
     qreal width = 0;
     for (auto it = buttons.constBegin(); it != buttons.constEnd(); ++it) {
         if (!(*it)->isVisible()) {
             continue;
         }
         height = qMax(height, qreal((*it)->size().height()));
         width += (*it)->size().width();
         if (it + 1 != buttons.constEnd()) {
             width += spacing;
         }
     }
     setGeometry(QRectF(pos, QSizeF(width, height)));
 
     QGuiApplication* app = qobject_cast<QGuiApplication*>(QCoreApplication::instance());
     const auto layoutDirection = app ? app->layoutDirection() : Qt::LeftToRight;
 
     qreal leftPosition = pos.x();
     qreal rightPosition = pos.x() + width;
 
     if (layoutDirection == Qt::LeftToRight) for (auto button : qAsConst(buttons)) {
         if (!button->isVisible()) {
             continue;
         }
         const auto size = button->size();
         const auto buttonPos = QPointF(leftPosition, pos.y());
         button->setGeometry(QRectF(buttonPos, size));
         leftPosition += size.width() + spacing;
     } else if (layoutDirection == Qt::RightToLeft) for (auto button : qAsConst(buttons)) {
         if (!button->isVisible()) {
             continue;
         }
         const auto size = button->size();
         const auto buttonPos = QPointF(rightPosition - size.width(), pos.y());
         button->setGeometry(QRectF(buttonPos, size));
         rightPosition -= size.width() + spacing;
     } else {
         qCritical() << "There's an unhandled layout direction! This is likely an issue of KDecoration2 not being updated to handle it\n"
                     << "or the application having an invalid layout direction set. Either way, this is a critical bug.";
     }
 
     s_layoutRecursion = false;
 }
 
 DecorationButtonGroup::DecorationButtonGroup(Decoration *parent)
     : QObject(parent)
     , d(new Private(parent, this))
 {
 }
 
 DecorationButtonGroup::DecorationButtonGroup(DecorationButtonGroup::Position type,
                                              Decoration *parent,
                                              std::function<DecorationButton *(DecorationButtonType, Decoration *, QObject *)> buttonCreator)
     : QObject(parent)
     , d(new Private(parent, this))
 {
     QGuiApplication* app = qobject_cast<QGuiApplication*>(QCoreApplication::instance());
     const auto layoutDirection = app ? app->layoutDirection() : Qt::LeftToRight;
     auto settings = parent->settings();
     auto createButtons = [=] {
         const auto &buttons =
             (type == Position::Left) ?
                 (layoutDirection == Qt::LeftToRight ? settings->decorationButtonsLeft() : settings->decorationButtonsRight()) :
                 (layoutDirection == Qt::LeftToRight ? settings->decorationButtonsRight() : settings->decorationButtonsLeft());
         for (DecorationButtonType type : buttons) {
             if (DecorationButton *b = buttonCreator(type, parent, this)) {
                 addButton(QPointer<DecorationButton>(b));
             }
         }
     };
     createButtons();
     auto changed = type == Position::Left ? &DecorationSettings::decorationButtonsLeftChanged : &DecorationSettings::decorationButtonsRightChanged;
     connect(settings.data(), changed, this, [this, createButtons] {
         qDeleteAll(d->buttons);
         d->buttons.clear();
         createButtons();
     });
 }
 
 DecorationButtonGroup::~DecorationButtonGroup() = default;
 
 QPointer<Decoration> DecorationButtonGroup::decoration() const
 {
     return QPointer<Decoration>(d->decoration);
 }
 
 QRectF DecorationButtonGroup::geometry() const
 {
     return d->geometry;
 }
 
 bool DecorationButtonGroup::hasButton(DecorationButtonType type) const
 {
     // TODO: check for deletion of button
     auto it = std::find_if(d->buttons.begin(), d->buttons.end(), [type](const QPointer<DecorationButton> &button) {
         return button->type() == type;
     });
     return it != d->buttons.end();
 }
 
 qreal DecorationButtonGroup::spacing() const
 {
     return d->spacing;
 }
 
 QPointF DecorationButtonGroup::pos() const
 {
     return d->geometry.topLeft();
 }
 
 void DecorationButtonGroup::setPos(const QPointF &pos)
 {
     if (d->geometry.topLeft() == pos) {
         return;
     }
     d->setGeometry(QRectF(pos, d->geometry.size()));
     d->updateLayout();
 }
 
 void DecorationButtonGroup::setSpacing(qreal spacing)
 {
     if (d->spacing == spacing) {
         return;
     }
     d->spacing = spacing;
     Q_EMIT spacingChanged(d->spacing);
     d->updateLayout();
 }
 
 void DecorationButtonGroup::addButton(const QPointer<DecorationButton> &button)
 {
     Q_ASSERT(!button.isNull());
     connect(button.data(), &DecorationButton::visibilityChanged, this, [this]() {
         d->updateLayout();
     });
     connect(button.data(), &DecorationButton::geometryChanged, this, [this]() {
         d->updateLayout();
     });
     d->buttons.append(button);
     d->updateLayout();
 }
 
 QVector<QPointer<DecorationButton>> DecorationButtonGroup::buttons() const
 {
     return d->buttons;
 }
 
 void DecorationButtonGroup::removeButton(DecorationButtonType type)
 {
     bool needUpdate = false;
     auto it = d->buttons.begin();
     while (it != d->buttons.end()) {
         if ((*it)->type() == type) {
             it = d->buttons.erase(it);
             needUpdate = true;
         } else {
             it++;
         }
     }
     if (needUpdate) {
         d->updateLayout();
     }
 }
 
 void DecorationButtonGroup::removeButton(const QPointer<DecorationButton> &button)
 {
     bool needUpdate = false;
     auto it = d->buttons.begin();
     while (it != d->buttons.end()) {
         if (*it == button) {
             it = d->buttons.erase(it);
             needUpdate = true;
         } else {
             it++;
         }
     }
     if (needUpdate) {
         d->updateLayout();
     }
 }
 
 void DecorationButtonGroup::paint(QPainter *painter, const QRect &repaintArea)
 {
     const auto &buttons = d->buttons;
     for (auto button : buttons) {
         if (!button->isVisible()) {
             continue;
         }
         button->paint(painter, repaintArea);
     }
 }
 
 } // namespace