src/kitemviews/kstandarditemlistview.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2012 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 "kstandarditemlistview.h"
  21
  22 #include <KDebug>
  23 #include <KIconLoader>
  24 #include "kstandarditemlistwidget.h"
  25
  26 KStandardItemListView::KStandardItemListView(QGraphicsWidget* parent) :
  27     KItemListView(parent),
  28     m_itemLayout(DetailsLayout)
  29 {
  30     setAcceptDrops(true);
  31     setScrollOrientation(Qt::Vertical);
  32     setVisibleRoles(QList<QByteArray>() << "text");
  33 }
  34
  35 KStandardItemListView::~KStandardItemListView()
  36 {
  37 }
  38
  39 void KStandardItemListView::setItemLayout(ItemLayout layout)
  40 {
  41     if (m_itemLayout == layout) {
  42         return;
  43     }
  44
  45     beginTransaction();
  46
  47     const ItemLayout previous = m_itemLayout;
  48     m_itemLayout = layout;
  49
  50     switch (layout) {
  51     case IconsLayout:
  52         setScrollOrientation(Qt::Vertical);
  53         setSupportsItemExpanding(false);
  54         break;
  55     case DetailsLayout:
  56         setScrollOrientation(Qt::Vertical);
  57         setSupportsItemExpanding(true);
  58         break;
  59     case CompactLayout:
  60         setScrollOrientation(Qt::Horizontal);
  61         setSupportsItemExpanding(false);
  62         break;
  63     default:
  64         Q_ASSERT(false);
  65         break;
  66     }
  67
  68     onItemLayoutChanged(layout, previous);
  69
  70     endTransaction();
  71 }
  72
  73 KStandardItemListView::ItemLayout KStandardItemListView::itemLayout() const
  74 {
  75     return m_itemLayout;
  76 }
  77
  78 KItemListWidgetCreatorBase* KStandardItemListView::defaultWidgetCreator() const
  79 {
  80     return new KItemListWidgetCreator<KStandardItemListWidget>();
  81 }
  82
  83 KItemListGroupHeaderCreatorBase* KStandardItemListView::defaultGroupHeaderCreator() const
  84 {
  85     return 0; // TODO: new KItemListGroupHeaderCreator<KStandardItemListGroupHeader>()
  86 }
  87
  88 void KStandardItemListView::initializeItemListWidget(KItemListWidget* item)
  89 {
  90     KStandardItemListWidget* standardItemListWidget = qobject_cast<KStandardItemListWidget*>(item);
  91     Q_ASSERT(standardItemListWidget);
  92
  93     switch (itemLayout()) {
  94     case IconsLayout:   standardItemListWidget->setLayout(KStandardItemListWidget::IconsLayout); break;
  95     case CompactLayout: standardItemListWidget->setLayout(KStandardItemListWidget::CompactLayout); break;
  96     case DetailsLayout: standardItemListWidget->setLayout(KStandardItemListWidget::DetailsLayout); break;
  97     default:            Q_ASSERT(false); break;
  98     }
  99
 100     standardItemListWidget->setSupportsItemExpanding(supportsItemExpanding());
 101 }
 102
 103
 104 bool KStandardItemListView::itemSizeHintUpdateRequired(const QSet<QByteArray>& changedRoles) const
 105 {
 106     // Even if the icons have a different size they are always aligned within
 107     // the area defined by KItemStyleOption.iconSize and hence result in no
 108     // change of the item-size.
 109     const bool containsIconName = changedRoles.contains("iconName");
 110     const bool containsIconPixmap = changedRoles.contains("iconPixmap");
 111     const int count = changedRoles.count();
 112
 113     const bool iconChanged = (containsIconName && containsIconPixmap && count == 2) ||
 114                              (containsIconName && count == 1) ||
 115                              (containsIconPixmap && count == 1);
 116     return !iconChanged;
 117 }
 118
 119 void KStandardItemListView::onItemLayoutChanged(ItemLayout current, ItemLayout previous)
 120 {
 121     Q_UNUSED(current);
 122     Q_UNUSED(previous);
 123     updateLayoutOfVisibleItems();
 124 }
 125
 126 void KStandardItemListView::onScrollOrientationChanged(Qt::Orientation current, Qt::Orientation previous)
 127 {
 128     Q_UNUSED(current);
 129     Q_UNUSED(previous);
 130     updateLayoutOfVisibleItems();
 131 }
 132
 133 void KStandardItemListView::onSupportsItemExpandingChanged(bool supportsExpanding)
 134 {
 135     Q_UNUSED(supportsExpanding);
 136     updateLayoutOfVisibleItems();
 137 }
 138
 139
 140 void KStandardItemListView::polishEvent()
 141 {
 142     switch (m_itemLayout) {
 143     case IconsLayout:   applyDefaultStyleOption(KIconLoader::SizeMedium, 2, 4, 8); break;
 144     case CompactLayout: applyDefaultStyleOption(KIconLoader::SizeSmall,  2, 8, 0); break;
 145     case DetailsLayout: applyDefaultStyleOption(KIconLoader::SizeSmall,  2, 0, 0); break;
 146     default:            Q_ASSERT(false); break;
 147     }
 148
 149     QGraphicsWidget::polishEvent();
 150 }
 151
 152 void KStandardItemListView::applyDefaultStyleOption(int iconSize,
 153                                                     int padding,
 154                                                     int horizontalMargin,
 155                                                     int verticalMargin)
 156 {
 157     KItemListStyleOption option = styleOption();
 158
 159     bool changed = false;
 160     if (option.iconSize < 0) {
 161         option.iconSize = iconSize;
 162         changed = true;
 163     }
 164     if (option.padding < 0) {
 165         option.padding = padding;
 166         changed = true;
 167     }
 168     if (option.horizontalMargin < 0) {
 169         option.horizontalMargin = horizontalMargin;
 170         changed = true;
 171     }
 172     if (option.verticalMargin < 0) {
 173         option.verticalMargin = verticalMargin;
 174         changed = true;
 175     }
 176
 177     if (changed) {
 178         setStyleOption(option);
 179     }
 180 }
 181
 182 void KStandardItemListView::updateLayoutOfVisibleItems()
 183 {
 184     if (model()) {
 185         foreach (KItemListWidget* widget, visibleItemListWidgets()) {
 186             initializeItemListWidget(widget);
 187         }
 188     }
 189 }
 190
 191 #include "kstandarditemlistview.moc"