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     setSupportsItemExpanding(itemLayoutSupportsItemExpanding(layout));
  52     setScrollOrientation(layout == CompactLayout ? Qt::Horizontal : Qt::Vertical);
  53
  54     onItemLayoutChanged(layout, previous);
  55
  56     endTransaction();
  57 }
  58
  59 KStandardItemListView::ItemLayout KStandardItemListView::itemLayout() const
  60 {
  61     return m_itemLayout;
  62 }
  63
  64 KItemListWidgetCreatorBase* KStandardItemListView::defaultWidgetCreator() const
  65 {
  66     return new KItemListWidgetCreator<KStandardItemListWidget>();
  67 }
  68
  69 KItemListGroupHeaderCreatorBase* KStandardItemListView::defaultGroupHeaderCreator() const
  70 {
  71     return new KItemListGroupHeaderCreator<KStandardItemListGroupHeader>();
  72 }
  73
  74 void KStandardItemListView::initializeItemListWidget(KItemListWidget* item)
  75 {
  76     KStandardItemListWidget* standardItemListWidget = qobject_cast<KStandardItemListWidget*>(item);
  77     Q_ASSERT(standardItemListWidget);
  78
  79     switch (itemLayout()) {
  80     case IconsLayout:   standardItemListWidget->setLayout(KStandardItemListWidget::IconsLayout); break;
  81     case CompactLayout: standardItemListWidget->setLayout(KStandardItemListWidget::CompactLayout); break;
  82     case DetailsLayout: standardItemListWidget->setLayout(KStandardItemListWidget::DetailsLayout); break;
  83     default:            Q_ASSERT(false); break;
  84     }
  85
  86     standardItemListWidget->setSupportsItemExpanding(supportsItemExpanding());
  87 }
  88
  89
  90 bool KStandardItemListView::itemSizeHintUpdateRequired(const QSet<QByteArray>& changedRoles) const
  91 {
  92     // The only thing that can modify the item's size hint is the amount of space
  93     // needed to display the text for the visible roles.
  94     // Even if the icons have a different size they are always aligned within
  95     // the area defined by KItemStyleOption.iconSize and hence result in no
  96     // change of the item-size.
  97     foreach (const QByteArray& role, visibleRoles()) {
  98         if (changedRoles.contains(role)) {
  99             return true;
 100         }
 101     }
 102     return false;
 103 }
 104
 105 bool KStandardItemListView::itemLayoutSupportsItemExpanding(ItemLayout layout) const
 106 {
 107     return layout == DetailsLayout;
 108 }
 109
 110 void KStandardItemListView::onItemLayoutChanged(ItemLayout current, ItemLayout previous)
 111 {
 112     Q_UNUSED(current);
 113     Q_UNUSED(previous);
 114     updateLayoutOfVisibleItems();
 115 }
 116
 117 void KStandardItemListView::onScrollOrientationChanged(Qt::Orientation current, Qt::Orientation previous)
 118 {
 119     Q_UNUSED(current);
 120     Q_UNUSED(previous);
 121     updateLayoutOfVisibleItems();
 122 }
 123
 124 void KStandardItemListView::onSupportsItemExpandingChanged(bool supportsExpanding)
 125 {
 126     Q_UNUSED(supportsExpanding);
 127     updateLayoutOfVisibleItems();
 128 }
 129
 130
 131 void KStandardItemListView::polishEvent()
 132 {
 133     switch (m_itemLayout) {
 134     case IconsLayout:   applyDefaultStyleOption(style()->pixelMetric(QStyle::PM_LargeIconSize), 2, 4, 8); break;
 135     case CompactLayout: applyDefaultStyleOption(style()->pixelMetric(QStyle::PM_SmallIconSize),  2, 8, 0); break;
 136     case DetailsLayout: applyDefaultStyleOption(style()->pixelMetric(QStyle::PM_SmallIconSize),  2, 0, 0); break;
 137     default:            Q_ASSERT(false); break;
 138     }
 139
 140     QGraphicsWidget::polishEvent();
 141 }
 142
 143 void KStandardItemListView::applyDefaultStyleOption(int iconSize,
 144                                                     int padding,
 145                                                     int horizontalMargin,
 146                                                     int verticalMargin)
 147 {
 148     KItemListStyleOption option = styleOption();
 149
 150     bool changed = false;
 151     if (option.iconSize < 0) {
 152         option.iconSize = iconSize;
 153         changed = true;
 154     }
 155     if (option.padding < 0) {
 156         option.padding = padding;
 157         changed = true;
 158     }
 159     if (option.horizontalMargin < 0) {
 160         option.horizontalMargin = horizontalMargin;
 161         changed = true;
 162     }
 163     if (option.verticalMargin < 0) {
 164         option.verticalMargin = verticalMargin;
 165         changed = true;
 166     }
 167
 168     if (changed) {
 169         setStyleOption(option);
 170     }
 171 }
 172
 173 void KStandardItemListView::updateLayoutOfVisibleItems()
 174 {
 175     if (model()) {
 176         foreach (KItemListWidget* widget, visibleItemListWidgets()) {
 177             initializeItemListWidget(widget);
 178         }
 179     }
 180 }
 181
 182 #include "kstandarditemlistview.moc"