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 <KIconLoader>
  23 #include "kstandarditemlistwidget.h"
  24 #include "kstandarditemlistgroupheader.h"
  25
  26 KStandardItemListView::KStandardItemListView(QGraphicsWidget* parent) :
  27     KItemListView(parent),
  28     m_itemLayout(DetailsLayout)
  29 {
  30     setAcceptDrops(true);
  31     setScrollOrientation(Qt::Vertical);
  32     setVisibleRoles({"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     setSupportsItemExpanding(itemLayoutSupportsItemExpanding(layout));
  51     setScrollOrientation(layout == CompactLayout ? Qt::Horizontal : Qt::Vertical);
  52
  53     onItemLayoutChanged(layout, previous);
  54
  55     endTransaction();
  56 }
  57
  58 KStandardItemListView::ItemLayout KStandardItemListView::itemLayout() const
  59 {
  60     return m_itemLayout;
  61 }
  62
  63 KItemListWidgetCreatorBase* KStandardItemListView::defaultWidgetCreator() const
  64 {
  65     return new KItemListWidgetCreator<KStandardItemListWidget>();
  66 }
  67
  68 KItemListGroupHeaderCreatorBase* KStandardItemListView::defaultGroupHeaderCreator() const
  69 {
  70     return new KItemListGroupHeaderCreator<KStandardItemListGroupHeader>();
  71 }
  72
  73 void KStandardItemListView::initializeItemListWidget(KItemListWidget* item)
  74 {
  75     KStandardItemListWidget* standardItemListWidget = qobject_cast<KStandardItemListWidget*>(item);
  76     Q_ASSERT(standardItemListWidget);
  77
  78     switch (itemLayout()) {
  79     case IconsLayout:   standardItemListWidget->setLayout(KStandardItemListWidget::IconsLayout); break;
  80     case CompactLayout: standardItemListWidget->setLayout(KStandardItemListWidget::CompactLayout); break;
  81     case DetailsLayout: standardItemListWidget->setLayout(KStandardItemListWidget::DetailsLayout); break;
  82     default:            Q_ASSERT(false); break;
  83     }
  84
  85     standardItemListWidget->setSupportsItemExpanding(supportsItemExpanding());
  86 }
  87
  88
  89 bool KStandardItemListView::itemSizeHintUpdateRequired(const QSet<QByteArray>& changedRoles) const
  90 {
  91     // The only thing that can modify the item's size hint is the amount of space
  92     // needed to display the text for the visible roles.
  93     // Even if the icons have a different size they are always aligned within
  94     // the area defined by KItemStyleOption.iconSize and hence result in no
  95     // change of the item-size.
  96     foreach (const QByteArray& role, visibleRoles()) {
  97         if (changedRoles.contains(role)) {
  98             return true;
  99         }
 100     }
 101     return false;
 102 }
 103
 104 bool KStandardItemListView::itemLayoutSupportsItemExpanding(ItemLayout layout) const
 105 {
 106     return layout == DetailsLayout;
 107 }
 108
 109 void KStandardItemListView::onItemLayoutChanged(ItemLayout current, ItemLayout previous)
 110 {
 111     Q_UNUSED(current);
 112     Q_UNUSED(previous);
 113     updateLayoutOfVisibleItems();
 114 }
 115
 116 void KStandardItemListView::onScrollOrientationChanged(Qt::Orientation current, Qt::Orientation previous)
 117 {
 118     Q_UNUSED(current);
 119     Q_UNUSED(previous);
 120     updateLayoutOfVisibleItems();
 121 }
 122
 123 void KStandardItemListView::onSupportsItemExpandingChanged(bool supportsExpanding)
 124 {
 125     Q_UNUSED(supportsExpanding);
 126     updateLayoutOfVisibleItems();
 127 }
 128
 129
 130 void KStandardItemListView::polishEvent()
 131 {
 132     switch (m_itemLayout) {
 133     case IconsLayout:   applyDefaultStyleOption(style()->pixelMetric(QStyle::PM_LargeIconSize), 2, 4, 8); break;
 134     case CompactLayout: applyDefaultStyleOption(style()->pixelMetric(QStyle::PM_SmallIconSize),  2, 8, 0); break;
 135     case DetailsLayout: applyDefaultStyleOption(style()->pixelMetric(QStyle::PM_SmallIconSize),  2, 0, 0); break;
 136     default:            Q_ASSERT(false); break;
 137     }
 138
 139     QGraphicsWidget::polishEvent();
 140 }
 141
 142 void KStandardItemListView::applyDefaultStyleOption(int iconSize,
 143                                                     int padding,
 144                                                     int horizontalMargin,
 145                                                     int verticalMargin)
 146 {
 147     KItemListStyleOption option = styleOption();
 148
 149     bool changed = false;
 150     if (option.iconSize < 0) {
 151         option.iconSize = iconSize;
 152         changed = true;
 153     }
 154     if (option.padding < 0) {
 155         option.padding = padding;
 156         changed = true;
 157     }
 158     if (option.horizontalMargin < 0) {
 159         option.horizontalMargin = horizontalMargin;
 160         changed = true;
 161     }
 162     if (option.verticalMargin < 0) {
 163         option.verticalMargin = verticalMargin;
 164         changed = true;
 165     }
 166
 167     if (changed) {
 168         setStyleOption(option);
 169     }
 170 }
 171
 172 void KStandardItemListView::updateLayoutOfVisibleItems()
 173 {
 174     if (model()) {
 175         foreach (KItemListWidget* widget, visibleItemListWidgets()) {
 176             initializeItemListWidget(widget);
 177         }
 178     }
 179 }
 180