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 #include <QPainter>
  24
  25
  26 KItemListSelectionToggle::KItemListSelectionToggle(QGraphicsItem* parent) :
  27     QGraphicsWidget(parent, 0),
  28     m_checked(false),
  29     m_hovered(false)
  30 {
  31 }
  32
  33 KItemListSelectionToggle::~KItemListSelectionToggle()
  34 {
  35 }
  36
  37 void KItemListSelectionToggle::setChecked(bool checked)
  38 {
  39     if (m_checked != checked) {
  40         m_checked = checked;
  41         m_pixmap = QPixmap();
  42         update();
  43     }
  44 }
  45
  46 bool KItemListSelectionToggle::isChecked() const
  47 {
  48     return m_checked;
  49 }
  50
  51 void KItemListSelectionToggle::setHovered(bool hovered)
  52 {
  53     if (m_hovered != hovered) {
  54         m_hovered = hovered;
  55         m_pixmap = QPixmap();
  56         update();
  57     }
  58 }
  59
  60 void KItemListSelectionToggle::paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget)
  61 {
  62     Q_UNUSED(option);
  63     Q_UNUSED(widget);
  64
  65     if (m_pixmap.isNull()) {
  66         updatePixmap();
  67     }
  68
  69     const qreal x = (size().width()  - qreal(m_pixmap.width()))  / 2;
  70     const qreal y = (size().height() - qreal(m_pixmap.height())) / 2;
  71     painter->drawPixmap(x, y, m_pixmap);
  72 }
  73
  74 void KItemListSelectionToggle::resizeEvent(QGraphicsSceneResizeEvent* event)
  75 {
  76     QGraphicsWidget::resizeEvent(event);
  77
  78     if (!m_pixmap.isNull()) {
  79         const int pixmapSize = m_pixmap.size().width(); // Pixmap width is always equal pixmap height
  80
  81         if (pixmapSize != iconSize()) {
  82             // If the required icon size is different from the actual pixmap size,
  83             // overwrite the m_pixmap with an empty pixmap and reload the new
  84             // icon on next re-painting.
  85             m_pixmap = QPixmap();
  86         }
  87     }
  88 }
  89
  90 void KItemListSelectionToggle::updatePixmap()
  91 {
  92     const QString icon = m_checked ? QStringLiteral("list-remove") : QStringLiteral("list-add");
  93     const KIconLoader::States state = m_hovered ? KIconLoader::ActiveState : KIconLoader::DisabledState;
  94     m_pixmap = KIconLoader::global()->loadIcon(icon, KIconLoader::Desktop, iconSize(), state);
  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