plasma-framework/layouts/nodelayout.cpp

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/*
* Copyright (C) 2007 Ivan Cukic <ivan.cukic+kde@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License
* version 2, or (at your option) any later version, as published by the
* Free Software Foundation
*
* 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 Lesser General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "nodelayout.h"
#include <QPair>
#include <QMap>
#include <limits>
namespace Plasma
{
NodeLayout::NodeCoordinate::NodeCoordinate(qreal xRelative, qreal yRelative, qreal xAbsolute, qreal yAbsolute)
: xr(xRelative), xa(xAbsolute), yr(yRelative), ya(yAbsolute) {}
NodeLayout::NodeCoordinate NodeLayout::NodeCoordinate::simple(qreal x, qreal y,
CoordinateType xType, CoordinateType yType)
{
NodeLayout::NodeCoordinate coo;
switch (xType) {
case Relative:
coo.xr = x;
coo.xa = 0;
break;
case Absolute:
coo.xr = 0;
coo.xa = x;
break;
case InnerRelative:
coo.xr = x;
coo.xa = std::numeric_limits<float>::infinity();
break;
}
switch (yType) {
case Relative:
coo.yr = y;
coo.ya = 0;
break;
case Absolute:
coo.yr = 0;
coo.ya = y;
break;
case InnerRelative:
coo.yr = y;
coo.ya = std::numeric_limits<float>::infinity();
break;
}
return coo;
}
class NodeLayout::Private {
public:
QMap <LayoutItem * , QPair < NodeCoordinate, NodeCoordinate > > items;
//QRectF geometry;
NodeLayout * parent;
QSizeF sizeHint;
Private(NodeLayout * parentLayout) {
parent = parentLayout;
}
qreal calculateXPosition(const NodeCoordinate & coo, const QRectF & parentGeometry) const
{
return parentGeometry.left() + (coo.xr * parentGeometry.width()) + coo.xa;
}
qreal calculateYPosition(const NodeCoordinate & coo, const QRectF & parentGeometry) const
{
return parentGeometry.top() + (coo.yr * parentGeometry.height()) + coo.ya;
}
QPointF calculatePosition(const NodeCoordinate & coo, const QRectF & parentGeometry) const
{
Q_UNUSED( parentGeometry );
return QPointF(
calculateXPosition(coo, parent->geometry()),
calculateYPosition(coo, parent->geometry())
);
}
QRectF calculateRectangle(LayoutItem * item, QRectF geometry = QRectF()) const
{
if (geometry == QRectF()) geometry = parent->geometry();
QRectF result;
if (!item || !items.contains(item)) return QRectF();
result.setTopLeft(calculatePosition(items[item].first, geometry));
if (items[item].second.xa != std::numeric_limits<float>::infinity()) {
result.setRight(calculateXPosition(items[item].second, geometry));
} else {
result.setWidth(item->sizeHint().width());
result.moveLeft(result.left() - items[item].second.xr * result.width());
}
if (items[item].second.ya != std::numeric_limits<float>::infinity()) {
result.setBottom(calculateYPosition(items[item].second, geometry));
} else {
result.setHeight(item->sizeHint().height());
result.moveTop(result.top() - items[item].second.yr * result.height());
}
return result;
}
void calculateSizeHint(LayoutItem * item = NULL) {
if (item == NULL) {
// Recalculate the sizeHint using all items
sizeHint = QSizeF();
foreach (LayoutItem * item, items.keys()) {
if (item) {
calculateSizeHint(item);
}
}
} else {
// Calculate size hint for current item
QRectF scaled = calculateRectangle(item, QRectF(0, 0, 1, 1));
// qMin(..., 1.0) so that for autosized elements we don't get smaller
// size than the item's size itself. The sizeHint for NodeLayout can
// not do anything smarter concerning the sizeHint when there are
// autosized elements.
qreal width = item->sizeHint().width() / qMin(scaled.width(), qreal(1.0));
qreal height = item->sizeHint().height() / qMin(scaled.height(), qreal(1.0));
if (width > sizeHint.width()) sizeHint.setWidth(width);
if (height > sizeHint.height()) sizeHint.setHeight(height);
}
}
};
NodeLayout::NodeLayout(LayoutItem * parent)
: Layout(parent), d(new Private(this))
{
}
NodeLayout::~NodeLayout()
{
delete d;
}
Qt::Orientations NodeLayout::expandingDirections() const
{
return Qt::Horizontal | Qt::Vertical;
}
void NodeLayout::relayout()
{
foreach (LayoutItem * item, d->items.keys()) {
if (item) {
item->setGeometry(d->calculateRectangle(item));
}
}
}
QSizeF NodeLayout::sizeHint() const
{
return d->sizeHint;
}
void NodeLayout::addItem(LayoutItem * item)
{
NodeLayout::addItem(item, NodeCoordinate());
}
void NodeLayout::addItem(LayoutItem * item, NodeCoordinate topLeft, NodeCoordinate bottomRight)
{
if (!item) {
return;
}
d->items[item] = QPair<NodeCoordinate, NodeCoordinate>(topLeft, bottomRight);
item->setManagingLayout(this);
d->calculateSizeHint(item);
}
void NodeLayout::addItem(LayoutItem * item, NodeCoordinate node, qreal xr, qreal yr)
{
if (!item) {
return;
}
d->items[item] = QPair<NodeCoordinate, NodeCoordinate>(node,
NodeCoordinate::simple(xr, yr, NodeCoordinate::InnerRelative, NodeCoordinate::InnerRelative));
item->setManagingLayout(this);
d->calculateSizeHint(item);
}
void NodeLayout::removeItem(LayoutItem * item)
{
if (!item) {
return;
}
item->unsetManagingLayout(this);
d->items.remove(item);
d->calculateSizeHint();
}
int NodeLayout::count() const
{
return d->items.count();
}
int NodeLayout::indexOf(LayoutItem * item) const
{
if (!item) {
return -1;
}
return d->items.keys().indexOf(item);
}
LayoutItem * NodeLayout::itemAt(int i) const
{
if (i >= d->items.count()) {
return 0;
}
return d->items.keys()[i];
}
LayoutItem * NodeLayout::takeAt(int i)
{
if (i >= d->items.count()) {
return 0;
}
LayoutItem * item = itemAt(i);
removeItem(item);
return item;
}
}