src/iconmanager.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2008 by Peter Penz <peter.penz@gmx.at>                  *
   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 "iconmanager.h"
  21
  22 #include "dolphinmodel.h"
  23 #include "dolphinsortfilterproxymodel.h"
  24
  25 #include <kiconeffect.h>
  26 #include <kio/previewjob.h>
  27 #include <kdebug.h>
  28 #include <kdirlister.h>
  29 #include <konqmimedata.h>
  30
  31 #include <QApplication>
  32 #include <QAbstractItemView>
  33 #include <QClipboard>
  34 #include <QColor>
  35 #include <QIcon>
  36
  37 IconManager::IconManager(QAbstractItemView* parent, DolphinSortFilterProxyModel* model) :
  38     QObject(parent),
  39     m_showPreview(false),
  40     m_view(parent),
  41     m_previewJobs(),
  42     m_dolphinModel(0),
  43     m_proxyModel(model),
  44     m_cutItemsCache()
  45 {
  46     Q_ASSERT(m_view->iconSize().isValid());  // each view must provide its current icon size
  47
  48     m_dolphinModel = static_cast<DolphinModel*>(m_proxyModel->sourceModel());
  49     connect(m_dolphinModel->dirLister(), SIGNAL(newItems(const KFileItemList&)),
  50             this, SLOT(updateIcons(const KFileItemList&)));
  51
  52     QClipboard* clipboard = QApplication::clipboard();
  53     connect(clipboard, SIGNAL(dataChanged()),
  54             this, SLOT(updateCutItems()));
  55 }
  56
  57 IconManager::~IconManager()
  58 {
  59     foreach (KJob* job, m_previewJobs) {
  60         Q_ASSERT(job != 0);
  61         job->kill();
  62     }
  63     m_previewJobs.clear();
  64 }
  65
  66
  67 void IconManager::setShowPreview(bool show)
  68 {
  69     if (m_showPreview != show) {
  70         m_showPreview = show;
  71         m_cutItemsCache.clear();
  72         updateCutItems();
  73     }
  74 }
  75
  76 void IconManager::updateIcons(const KFileItemList& items)
  77 {
  78     // make the icons of all hidden files semitransparent
  79     foreach (KFileItem item, items) {
  80         if (item.isHidden()) {
  81             applyHiddenItemEffect(item);
  82         }
  83     }
  84
  85     if (!m_showPreview) {
  86         return;
  87     }
  88
  89     // generate previews
  90     const QRect visibleArea = m_view->viewport()->rect();
  91
  92     // Order the items in a way that the preview for the visible items
  93     // is generated first, as this improves the feeled performance a lot.
  94     KFileItemList orderedItems;
  95     foreach (KFileItem item, items) {
  96         const QModelIndex dirIndex = m_dolphinModel->indexForItem(item);
  97         const QModelIndex proxyIndex = m_proxyModel->mapFromSource(dirIndex);
  98         const QRect itemRect = m_view->visualRect(proxyIndex);
  99         if (itemRect.intersects(visibleArea)) {
 100             orderedItems.insert(0, item);
 101         } else {
 102             orderedItems.append(item);
 103         }
 104     }
 105
 106     const QSize size = m_view->iconSize();
 107     KIO::PreviewJob* job = KIO::filePreview(orderedItems, size.width(), size.height());
 108     connect(job, SIGNAL(gotPreview(const KFileItem&, const QPixmap&)),
 109             this, SLOT(replaceIcon(const KFileItem&, const QPixmap&)));
 110     connect(job, SIGNAL(finished(KJob*)),
 111             this, SLOT(slotPreviewJobFinished(KJob*)));
 112
 113     m_previewJobs.append(job);
 114 }
 115
 116 void IconManager::replaceIcon(const KFileItem& item, const QPixmap& pixmap)
 117 {
 118     Q_ASSERT(!item.isNull());
 119     if (!m_showPreview) {
 120         // the preview has been canceled in the meantime
 121         return;
 122     }
 123
 124     // check whether the item is part of the directory lister (it is possible
 125     // that a preview from an old directory lister is received)
 126     KDirLister* dirLister = m_dolphinModel->dirLister();
 127     bool isOldPreview = true;
 128     const KUrl::List dirs = dirLister->directories();
 129     const QString itemDir = item.url().directory();
 130     foreach (KUrl url, dirs) {
 131         if (url.path() == itemDir) {
 132             isOldPreview = false;
 133             break;
 134         }
 135     }
 136     if (isOldPreview) {
 137         return;
 138     }
 139
 140     const QModelIndex idx = m_dolphinModel->indexForItem(item);
 141     if (idx.isValid() && (idx.column() == 0)) {
 142         QPixmap icon = pixmap;
 143         if (item.isHidden()) {
 144             if (!icon.hasAlpha()) {
 145                 // the semitransparent operation requires having an alpha mask
 146                 QPixmap alphaMask(icon.width(), icon.height());
 147                 alphaMask.fill();
 148                 icon.setAlphaChannel(alphaMask);
 149             }
 150             KIconEffect::semiTransparent(icon);
 151         }
 152
 153         const QMimeData* mimeData = QApplication::clipboard()->mimeData();
 154         if (KonqMimeData::decodeIsCutSelection(mimeData) && isCutItem(item)) {
 155             KIconEffect iconEffect;
 156             icon = iconEffect.apply(icon, KIconLoader::Desktop, KIconLoader::DisabledState);
 157             m_dolphinModel->setData(idx, QIcon(icon), Qt::DecorationRole);
 158         } else {
 159             m_dolphinModel->setData(idx, QIcon(icon), Qt::DecorationRole);
 160         }
 161     }
 162 }
 163
 164 void IconManager::slotPreviewJobFinished(KJob* job)
 165 {
 166     const int index = m_previewJobs.indexOf(job);
 167     m_previewJobs.removeAt(index);
 168 }
 169
 170 void IconManager::updateCutItems()
 171 {
 172     // restore the icons of all previously selected items to the
 173     // original state...
 174     foreach (CutItem cutItem, m_cutItemsCache) {
 175         const QModelIndex index = m_dolphinModel->indexForUrl(cutItem.url);
 176         if (index.isValid()) {
 177             m_dolphinModel->setData(index, QIcon(cutItem.pixmap), Qt::DecorationRole);
 178         }
 179     }
 180     m_cutItemsCache.clear();
 181
 182     // ... and apply an item effect to all currently cut items
 183     applyCutItemEffect();
 184 }
 185
 186 bool IconManager::isCutItem(const KFileItem& item) const
 187 {
 188     const QMimeData* mimeData = QApplication::clipboard()->mimeData();
 189     const KUrl::List cutUrls = KUrl::List::fromMimeData(mimeData);
 190
 191     const KUrl& itemUrl = item.url();
 192     foreach (KUrl url, cutUrls) {
 193         if (url == itemUrl) {
 194             return true;
 195         }
 196     }
 197
 198     return false;
 199 }
 200
 201 void IconManager::applyCutItemEffect()
 202 {
 203     const QMimeData* mimeData = QApplication::clipboard()->mimeData();
 204     if (!KonqMimeData::decodeIsCutSelection(mimeData)) {
 205         return;
 206     }
 207
 208     KFileItemList items;
 209     KDirLister* dirLister = m_dolphinModel->dirLister();
 210     const KUrl::List dirs = dirLister->directories();
 211     foreach (KUrl url, dirs) {
 212         items << dirLister->itemsForDir(url);
 213     }
 214
 215     foreach (KFileItem item, items) {
 216         if (isCutItem(item)) {
 217             const QModelIndex index = m_dolphinModel->indexForItem(item);
 218             const QVariant value = m_dolphinModel->data(index, Qt::DecorationRole);
 219             if (value.type() == QVariant::Icon) {
 220                 const QIcon icon(qvariant_cast<QIcon>(value));
 221                 QPixmap pixmap = icon.pixmap(m_view->iconSize());
 222
 223                 // remember current pixmap for the item to be able
 224                 // to restore it when other items get cut
 225                 CutItem cutItem;
 226                 cutItem.url = item.url();
 227                 cutItem.pixmap = pixmap;
 228                 m_cutItemsCache.append(cutItem);
 229
 230                 // apply icon effect to the cut item
 231                 KIconEffect iconEffect;
 232                 pixmap = iconEffect.apply(pixmap, KIconLoader::Desktop, KIconLoader::DisabledState);
 233                 m_dolphinModel->setData(index, QIcon(pixmap), Qt::DecorationRole);
 234             }
 235         }
 236     }
 237 }
 238
 239 void IconManager::applyHiddenItemEffect(const KFileItem& hiddenItem)
 240 {
 241     const QModelIndex index = m_dolphinModel->indexForItem(hiddenItem);
 242     const QVariant value = m_dolphinModel->data(index, Qt::DecorationRole);
 243     if (value.type() == QVariant::Icon) {
 244         const QIcon icon(qvariant_cast<QIcon>(value));
 245         QPixmap pixmap = icon.pixmap(m_view->iconSize());
 246         KIconEffect::semiTransparent(pixmap);
 247         m_dolphinModel->setData(index, QIcon(pixmap), Qt::DecorationRole);
 248     }
 249 }
 250
 251 #include "iconmanager.moc"