173 lines
4.5 KiB
C++
173 lines
4.5 KiB
C++
|
// 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"
|