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     setAcceptHoverEvents(true);
  34 }
  35
  36 KItemListSelectionToggle::~KItemListSelectionToggle()
  37 {
  38 }
  39
  40 void KItemListSelectionToggle::setChecked(bool checked)
  41 {
  42     if (m_checked != checked) {
  43         m_checked = checked;
  44         m_pixmap = QPixmap();
  45         update();
  46     }
  47 }
  48
  49 bool KItemListSelectionToggle::isChecked() const
  50 {
  51     return m_checked;
  52 }
  53
  54 void KItemListSelectionToggle::paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget)
  55 {
  56     Q_UNUSED(option);
  57     Q_UNUSED(widget);
  58
  59     if (m_pixmap.isNull()) {
  60         updatePixmap();
  61     }
  62
  63     const qreal x = (size().width()  - qreal(m_pixmap.width()))  / 2;
  64     const qreal y = (size().height() - qreal(m_pixmap.height())) / 2;
  65     painter->drawPixmap(x, y, m_pixmap);
  66 }
  67
  68 void KItemListSelectionToggle::hoverEnterEvent(QGraphicsSceneHoverEvent* event)
  69 {
  70     QGraphicsWidget::hoverEnterEvent(event);
  71     m_hovered = true;
  72     m_pixmap = QPixmap();
  73 }
  74
  75 void KItemListSelectionToggle::hoverLeaveEvent(QGraphicsSceneHoverEvent* event)
  76 {
  77     QGraphicsWidget::hoverLeaveEvent(event);
  78     m_hovered = false;
  79     m_pixmap = QPixmap();
  80 }
  81
  82 void KItemListSelectionToggle::resizeEvent(QGraphicsSceneResizeEvent* event)
  83 {
  84     QGraphicsWidget::resizeEvent(event);
  85
  86     if (!m_pixmap.isNull()) {
  87         const int pixmapSize = m_pixmap.size().width(); // Pixmap width is always equal pixmap height
  88
  89         if (pixmapSize != iconSize()) {
  90             // If the required icon size is different from the actual pixmap size,
  91             // overwrite the m_pixmap with an empty pixmap and reload the new
  92             // icon on next re-painting.
  93             m_pixmap = QPixmap();
  94         }
  95     }
  96 }
  97
  98 void KItemListSelectionToggle::updatePixmap()
  99 {
 100     const char* icon = m_checked ? "list-remove" : "list-add";
 101     m_pixmap = KIconLoader::global()->loadIcon(QLatin1String(icon), KIconLoader::NoGroup, iconSize());
 102
 103     if (m_hovered) {
 104         KIconLoader::global()->iconEffect()->apply(m_pixmap, KIconLoader::Desktop, KIconLoader::ActiveState);
 105     }
 106 }
 107
 108 int KItemListSelectionToggle::iconSize() const
 109 {
 110     const int iconSize = qMin(size().width(), size().height());
 111
 112     if (iconSize < KIconLoader::SizeSmallMedium) {
 113         return KIconLoader::SizeSmall;
 114     } else if (iconSize < KIconLoader::SizeMedium) {
 115         return KIconLoader::SizeSmallMedium;
 116     } else if (iconSize < KIconLoader::SizeLarge) {
 117         return KIconLoader::SizeMedium;
 118     } else if (iconSize < KIconLoader::SizeHuge) {
 119         return KIconLoader::SizeLarge;
 120     } else if (iconSize < KIconLoader::SizeEnormous) {
 121         return KIconLoader::SizeHuge;
 122     }
 123
 124     return iconSize;
 125 }
 126
 127 #include "kitemlistselectiontoggle.moc"