File indexing completed on 2024-04-28 04:18:50

 // vim: set tabstop=4 shiftwidth=4 expandtab:
 /*
 Gwenview: an image viewer
 Copyright 2008 Aurélien Gâteau <agateau@kde.org>
 
 This program is free software; you can redistribute it and/or
 modify it under the terms of the GNU General Public License
 as published by the Free Software Foundation; either version 2
 of the License, or (at your option) any later version.
 
 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.
 
 You should have received a copy of the GNU General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 51 Franklin Street, Fifth Floor, Cambridge, MA 02110-1301, USA.
 
 */
 // Self
 #include "graphicswidgetfloater.h"
 
 // Qt
 #include <QApplication>
 #include <QEvent>
 #include <QGraphicsWidget>
 #include <QPointer>
 #include <QStyle>
 
 // Local
 
 namespace Gwenview
 {
 struct GraphicsWidgetFloaterPrivate {
     QGraphicsWidget *mParent = nullptr;
     QPointer<QGraphicsWidget> mChild;
     Qt::Alignment mAlignment;
 
     int mHorizontalMargin;
     int mVerticalMargin;
     bool mInsideUpdateChildGeometry;
 
     void updateChildGeometry()
     {
         if (!mChild) {
             return;
         }
         if (mInsideUpdateChildGeometry) {
             return;
         }
 
         int posX, posY;
         int childWidth, childHeight;
         int parentWidth, parentHeight;
 
         childWidth = mChild->size().width();
         childHeight = mChild->size().height();
 
         parentWidth = mParent->size().width();
         parentHeight = mParent->size().height();
 
         if (parentWidth == 0 || parentHeight == 0) {
             return;
         }
 
         if (mAlignment & Qt::AlignLeft) {
             posX = mHorizontalMargin;
         } else if (mAlignment & Qt::AlignHCenter) {
             posX = (parentWidth - childWidth) / 2;
         } else if (mAlignment & Qt::AlignJustify) {
             posX = mHorizontalMargin;
             childWidth = parentWidth - 2 * mHorizontalMargin;
         } else {
             posX = parentWidth - childWidth - mHorizontalMargin;
         }
 
         if (mAlignment & Qt::AlignTop) {
             posY = mVerticalMargin;
         } else if (mAlignment & Qt::AlignVCenter) {
             posY = (parentHeight - childHeight) / 2;
         } else {
             posY = parentHeight - childHeight - mVerticalMargin;
         }
 
         mInsideUpdateChildGeometry = true;
         mChild->setGeometry(posX, posY, childWidth, childHeight);
         mInsideUpdateChildGeometry = false;
     }
 };
 
 GraphicsWidgetFloater::GraphicsWidgetFloater(QGraphicsWidget *parent)
     : QObject(parent)
     , d(new GraphicsWidgetFloaterPrivate)
 {
     Q_ASSERT(parent);
     d->mParent = parent;
     d->mParent->installEventFilter(this);
     d->mChild = nullptr;
     d->mAlignment = Qt::AlignCenter;
     // TODO
     d->mHorizontalMargin = 0;
     d->mVerticalMargin = d->mHorizontalMargin;
     d->mInsideUpdateChildGeometry = false;
 }
 
 GraphicsWidgetFloater::~GraphicsWidgetFloater()
 {
     delete d;
 }
 
 void GraphicsWidgetFloater::setChildWidget(QGraphicsWidget *child)
 {
     if (d->mChild) {
         d->mChild->removeEventFilter(this);
         disconnect(d->mChild, nullptr, this, nullptr);
     }
     d->mChild = child;
     d->mChild->setParent(d->mParent);
     d->mChild->installEventFilter(this);
     connect(d->mChild.data(), &QGraphicsObject::visibleChanged, this, &GraphicsWidgetFloater::slotChildVisibilityChanged);
     d->updateChildGeometry();
     // d->mChild->raise();
     d->mChild->show();
 }
 
 void GraphicsWidgetFloater::setAlignment(Qt::Alignment alignment)
 {
     d->mAlignment = alignment;
     d->updateChildGeometry();
 }
 
 bool GraphicsWidgetFloater::eventFilter(QObject *, QEvent *event)
 {
     if (event->type() == QEvent::GraphicsSceneResize) {
         d->updateChildGeometry();
     }
     return false;
 }
 
 void GraphicsWidgetFloater::slotChildVisibilityChanged()
 {
     if (d->mChild->isVisible()) {
         d->updateChildGeometry();
     }
 }
 
 void GraphicsWidgetFloater::setHorizontalMargin(int value)
 {
     d->mHorizontalMargin = value;
     d->updateChildGeometry();
 }
 
 int GraphicsWidgetFloater::horizontalMargin() const
 {
     return d->mHorizontalMargin;
 }
 
 void GraphicsWidgetFloater::setVerticalMargin(int value)
 {
     d->mVerticalMargin = value;
     d->updateChildGeometry();
 }
 
 int GraphicsWidgetFloater::verticalMargin() const
 {
     return d->mVerticalMargin;
 }
 
 } // namespace
 
 #include "moc_graphicswidgetfloater.cpp"