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 <KIconLoader>
  23
  24 #include <QIcon>
  25 #include <QPainter>
  26
  27 KItemListSelectionToggle::KItemListSelectionToggle(QGraphicsItem* parent) :
  28     QGraphicsWidget(parent),
  29     m_checked(false),
  30     m_hovered(false)
  31 {
  32 }
  33
  34 KItemListSelectionToggle::~KItemListSelectionToggle()
  35 {
  36 }
  37
  38 void KItemListSelectionToggle::setChecked(bool checked)
  39 {
  40     if (m_checked != checked) {
  41         m_checked = checked;
  42         m_pixmap = QPixmap();
  43         update();
  44     }
  45 }
  46
  47 bool KItemListSelectionToggle::isChecked() const
  48 {
  49     return m_checked;
  50 }
  51
  52 void KItemListSelectionToggle::setHovered(bool hovered)
  53 {
  54     if (m_hovered != hovered) {
  55         m_hovered = hovered;
  56         m_pixmap = QPixmap();
  57         update();
  58     }
  59 }
  60
  61 void KItemListSelectionToggle::paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget)
  62 {
  63     Q_UNUSED(option)
  64     Q_UNUSED(widget)
  65
  66     if (m_pixmap.isNull()) {
  67         updatePixmap();
  68     }
  69
  70     const qreal x = (size().width()  - qreal(m_pixmap.width() / m_pixmap.devicePixelRatioF()))  / 2;
  71     const qreal y = (size().height() - qreal(m_pixmap.height() / m_pixmap.devicePixelRatioF())) / 2;
  72     painter->drawPixmap(x, y, m_pixmap);
  73 }
  74
  75 void KItemListSelectionToggle::resizeEvent(QGraphicsSceneResizeEvent* event)
  76 {
  77     QGraphicsWidget::resizeEvent(event);
  78
  79     if (!m_pixmap.isNull()) {
  80         const int pixmapSize = m_pixmap.size().width() / m_pixmap.devicePixelRatioF(); // Pixmap width is always equal pixmap height
  81
  82         if (pixmapSize != iconSize()) {
  83             // If the required icon size is different from the actual pixmap size,
  84             // overwrite the m_pixmap with an empty pixmap and reload the new
  85             // icon on next re-painting.
  86             m_pixmap = QPixmap();
  87         }
  88     }
  89 }
  90
  91 void KItemListSelectionToggle::updatePixmap()
  92 {
  93     const QString icon = m_checked ? QStringLiteral("emblem-remove") : QStringLiteral("emblem-added");
  94     m_pixmap = QIcon::fromTheme(icon).pixmap(iconSize(), m_hovered ? QIcon::Active : QIcon::Disabled);
  95 }
  96
  97 int KItemListSelectionToggle::iconSize() const
  98 {
  99     const int iconSize = qMin(size().width(), size().height());
 100
 101     if (iconSize < KIconLoader::SizeSmallMedium) {
 102         return KIconLoader::SizeSmall;
 103     } else if (iconSize < KIconLoader::SizeMedium) {
 104         return KIconLoader::SizeSmallMedium;
 105     } else if (iconSize < KIconLoader::SizeLarge) {
 106         return KIconLoader::SizeMedium;
 107     } else if (iconSize < KIconLoader::SizeHuge) {
 108         return KIconLoader::SizeLarge;
 109     } else if (iconSize < KIconLoader::SizeEnormous) {
 110         return KIconLoader::SizeHuge;
 111     }
 112
 113     return iconSize;
 114 }
 115