src/kitemviews/private/kitemlistselectiontoggle.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2011 by Peter Penz <peter.penz19@gmail.com>             *
   3  *                                                                         *
   4  *   This program is free software; you can redistribute it and/or modify  *
   5  *   it under the terms of the GNU General Public License as published by  *
   6  *   the Free Software Foundation; either version 2 of the License, or     *
   7  *   (at your option) any later version.                                   *
   8  *                                                                         *
   9  *   This program is distributed in the hope that it will be useful,       *
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  12  *   GNU General Public License for more details.                          *
  13  *                                                                         *
  14  *   You should have received a copy of the GNU General Public License     *
  15  *   along with this program; if not, write to the                         *
  16  *   Free Software Foundation, Inc.,                                       *
  17  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
  18  ***************************************************************************/
  19
  20 #include "kitemlistselectiontoggle.h"
  21
  22 #include <KIconEffect>
  23 #include <KIconLoader>
  24 #include <QPainter>
  25
  26 #include <KDebug>
  27
  28 KItemListSelectionToggle::KItemListSelectionToggle(QGraphicsItem* parent) :
  29     QGraphicsWidget(parent, 0),
  30     m_checked(false),
  31     m_hovered(false)
  32 {
  33 }
  34
  35 KItemListSelectionToggle::~KItemListSelectionToggle()
  36 {
  37 }
  38
  39 void KItemListSelectionToggle::setChecked(bool checked)
  40 {
  41     if (m_checked != checked) {
  42         m_checked = checked;
  43         m_pixmap = QPixmap();
  44         update();
  45     }
  46 }
  47
  48 bool KItemListSelectionToggle::isChecked() const
  49 {
  50     return m_checked;
  51 }
  52
  53 void KItemListSelectionToggle::setHovered(bool hovered)
  54 {
  55     if (m_hovered != hovered) {
  56         m_hovered = hovered;
  57         m_pixmap = QPixmap();
  58         update();
  59     }
  60 }
  61
  62 void KItemListSelectionToggle::paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget)
  63 {
  64     Q_UNUSED(option);
  65     Q_UNUSED(widget);
  66
  67     if (m_pixmap.isNull()) {
  68         updatePixmap();
  69     }
  70
  71     const qreal x = (size().width()  - qreal(m_pixmap.width()))  / 2;
  72     const qreal y = (size().height() - qreal(m_pixmap.height())) / 2;
  73     painter->drawPixmap(x, y, m_pixmap);
  74 }
  75
  76 void KItemListSelectionToggle::resizeEvent(QGraphicsSceneResizeEvent* event)
  77 {
  78     QGraphicsWidget::resizeEvent(event);
  79
  80     if (!m_pixmap.isNull()) {
  81         const int pixmapSize = m_pixmap.size().width(); // Pixmap width is always equal pixmap height
  82
  83         if (pixmapSize != iconSize()) {
  84             // If the required icon size is different from the actual pixmap size,
  85             // overwrite the m_pixmap with an empty pixmap and reload the new
  86             // icon on next re-painting.
  87             m_pixmap = QPixmap();
  88         }
  89     }
  90 }
  91
  92 void KItemListSelectionToggle::updatePixmap()
  93 {
  94     const QString icon = m_checked ? "list-remove" : "list-add";
  95     const KIconLoader::States state = m_hovered ? KIconLoader::ActiveState : KIconLoader::DisabledState;
  96     m_pixmap = KIconLoader::global()->loadIcon(icon, KIconLoader::Desktop, iconSize(), state);
  97 }
  98
  99 int KItemListSelectionToggle::iconSize() const
 100 {
 101     const int iconSize = qMin(size().width(), size().height());
 102
 103     if (iconSize < KIconLoader::SizeSmallMedium) {
 104         return KIconLoader::SizeSmall;
 105     } else if (iconSize < KIconLoader::SizeMedium) {
 106         return KIconLoader::SizeSmallMedium;
 107     } else if (iconSize < KIconLoader::SizeLarge) {
 108         return KIconLoader::SizeMedium;
 109     } else if (iconSize < KIconLoader::SizeHuge) {
 110         return KIconLoader::SizeLarge;
 111     } else if (iconSize < KIconLoader::SizeEnormous) {
 112         return KIconLoader::SizeHuge;
 113     }
 114
 115     return iconSize;
 116 }
 117