workspace/libs/plasma/layouts/freelayout.cpp

   1 /*
   2  *   Copyright 2007 by Robert Knight <robertknight@gmail.com>
   3  *
   4  *   This program is free software; you can redistribute it and/or modify
   5  *   it under the terms of the GNU Library General Public License as
   6  *   published by the Free Software Foundation; either version 2, or
   7  *   (at your option) any later version.
   8
   9  *
  10  *   This program is distributed in the hope that it will be useful,
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *   GNU General Public License for more details
  14  *
  15  *   You should have received a copy of the GNU Library General Public
  16  *   License along with this program; if not, write to the
  17  *   Free Software Foundation, Inc.,
  18  *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  19  */
  20
  21 #include "freelayout.h"
  22
  23 #include <KDebug>
  24
  25 namespace Plasma
  26 {
  27
  28 class FreeLayout::Private
  29 {
  30 public:
  31     QList<QGraphicsLayoutItem*> children;
  32 };
  33
  34 FreeLayout::FreeLayout(QGraphicsLayoutItem *parent)
  35     : QGraphicsLayout(parent),
  36       d(new Private)
  37 {
  38     setSizePolicy(QSizePolicy::Expanding,QSizePolicy::Expanding,QSizePolicy::DefaultType);
  39 }
  40
  41 FreeLayout::~FreeLayout()
  42 {
  43     delete d;
  44 }
  45
  46 void FreeLayout::addItem(QGraphicsLayoutItem *item)
  47 {
  48     if (d->children.contains(item)) {
  49         return;
  50     }
  51
  52     d->children << item;
  53 }
  54
  55 void FreeLayout::removeItem(QGraphicsLayoutItem *item)
  56 {
  57     if (!item) {
  58         return;
  59     }
  60
  61     d->children.removeAll(item);
  62 }
  63
  64 int FreeLayout::indexOf(QGraphicsLayoutItem *item) const
  65 {
  66     return d->children.indexOf(item);
  67 }
  68
  69 QGraphicsLayoutItem * FreeLayout::itemAt(int i) const
  70 {
  71     return d->children[i];
  72 }
  73
  74 int FreeLayout::count() const
  75 {
  76     return d->children.count();
  77 }
  78
  79 QGraphicsLayoutItem * FreeLayout::takeAt(int i)
  80 {
  81     return d->children.takeAt(i);
  82 }
  83
  84 void FreeLayout::removeAt(int i)
  85 {
  86     d->children.removeAt(i);
  87 }
  88
  89 void FreeLayout::relayout()
  90 {
  91     foreach (QGraphicsLayoutItem *child , d->children) {
  92         if (child->geometry().size() != child->effectiveSizeHint(Qt::PreferredSize)) {
  93             const QSizeF newSize = child->effectiveSizeHint(Qt::PreferredSize).expandedTo(minimumSize()).boundedTo(maximumSize());
  94             child->setGeometry(QRectF(child->geometry().topLeft(), newSize));
  95         }
  96     }
  97 }
  98
  99 QRectF FreeLayout::geometry() const
 100 {
 101     if (parentLayoutItem()) {
 102         return parentLayoutItem()->geometry();
 103     }
 104
 105     return QRectF(QPointF(0, 0), maximumSize());
 106 }
 107
 108 void FreeLayout::setGeometry(const QRectF &geom)
 109 {
 110     if (!geom.isValid() || geom == geometry()) {
 111         return;
 112     }
 113
 114 //     QRectF newGeom = geom;
 115 //
 116 //     if (d->parent && !dynamic_cast<QGraphicsLayout*>(d->parent)) {
 117 //         newGeom = d->parent->adjustToMargins(newGeom);
 118 //         //kDebug() << "parent rect is" << d->parent->topLeft() << d->parent->size()
 119 //         //         << "and we are" << geometry() << "but aiming for"
 120 //         //         << newGeom << "from" << geom;
 121 //     }
 122 //
 123 //     d->pos = newGeom.topLeft();
 124     setPreferredSize(geom.size());
 125     // TODO: respect minimum and maximum sizes: is it possible?
 126     //setSize(newGeom.size().expandedTo(minimumSize()).boundedTo(maximumSize()));
 127
 128     //kDebug() << "geometry is now" << geometry();
 129     invalidate();
 130 }
 131
 132 QSizeF FreeLayout::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
 133 {
 134     if (parentLayoutItem()) {
 135         //kDebug() << "returning size hint from freelayout of" <<  parent()->geometry().size();
 136         return parentLayoutItem()->geometry().size();
 137     }
 138
 139     //kDebug() << "returning size hint from freelayout of" << maximumSize();
 140     return maximumSize();
 141 }
 142
 143 }
 144