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