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     KDirLister* dirLister = m_dolphinModel->dirLister();
 120     if (!m_showPreview || (item.url().directory() != dirLister->url().path())) {
 121         // the preview has been canceled in the meanwhile or the preview
 122         // job is still working on items of an older URL, hence
 123         // the item is not part of the directory model anymore
 124         return;
 125     }
 126
 127     const QModelIndex idx = m_dolphinModel->indexForItem(item);
 128     if (idx.isValid() && (idx.column() == 0)) {
 129         QPixmap icon = pixmap;
 130         if (item.isHidden()) {
 131             if (!icon.hasAlpha()) {
 132                 // the semitransparent operation requires having an alpha mask
 133                 QPixmap alphaMask(icon.width(), icon.height());
 134                 alphaMask.fill();
 135                 icon.setAlphaChannel(alphaMask);
 136             }
 137             KIconEffect::semiTransparent(icon);
 138         }
 139
 140         const QMimeData* mimeData = QApplication::clipboard()->mimeData();
 141         if (KonqMimeData::decodeIsCutSelection(mimeData) && isCutItem(item)) {
 142             KIconEffect iconEffect;
 143             icon = iconEffect.apply(icon, KIconLoader::Desktop, KIconLoader::DisabledState);
 144             m_dolphinModel->setData(idx, QIcon(icon), Qt::DecorationRole);
 145         } else {
 146             m_dolphinModel->setData(idx, QIcon(icon), Qt::DecorationRole);
 147         }
 148     }
 149 }
 150
 151 void IconManager::slotPreviewJobFinished(KJob* job)
 152 {
 153     const int index = m_previewJobs.indexOf(job);
 154     m_previewJobs.removeAt(index);
 155 }
 156
 157 void IconManager::updateCutItems()
 158 {
 159     // restore the icons of all previously selected items to the
 160     // original state...
 161     foreach (CutItem cutItem, m_cutItemsCache) {
 162         const QModelIndex index = m_dolphinModel->indexForUrl(cutItem.url);
 163         if (index.isValid()) {
 164             m_dolphinModel->setData(index, QIcon(cutItem.pixmap), Qt::DecorationRole);
 165         }
 166     }
 167     m_cutItemsCache.clear();
 168
 169     // ... and apply an item effect to all currently cut items
 170     applyCutItemEffect();
 171 }
 172
 173 bool IconManager::isCutItem(const KFileItem& item) const
 174 {
 175     const QMimeData* mimeData = QApplication::clipboard()->mimeData();
 176     const KUrl::List cutUrls = KUrl::List::fromMimeData(mimeData);
 177
 178     const KUrl& itemUrl = item.url();
 179     foreach (KUrl url, cutUrls) {
 180         if (url == itemUrl) {
 181             return true;
 182         }
 183     }
 184
 185     return false;
 186 }
 187
 188 void IconManager::applyCutItemEffect()
 189 {
 190     const QMimeData* mimeData = QApplication::clipboard()->mimeData();
 191     if (!KonqMimeData::decodeIsCutSelection(mimeData)) {
 192         return;
 193     }
 194
 195     const KFileItemList items(m_dolphinModel->dirLister()->items());
 196     foreach (KFileItem item, items) {
 197         if (isCutItem(item)) {
 198             const QModelIndex index = m_dolphinModel->indexForItem(item);
 199             const QVariant value = m_dolphinModel->data(index, Qt::DecorationRole);
 200             if (value.type() == QVariant::Icon) {
 201                 const QIcon icon(qvariant_cast<QIcon>(value));
 202                 QPixmap pixmap = icon.pixmap(m_view->iconSize());
 203
 204                 // remember current pixmap for the item to be able
 205                 // to restore it when other items get cut
 206                 CutItem cutItem;
 207                 cutItem.url = item.url();
 208                 cutItem.pixmap = pixmap;
 209                 m_cutItemsCache.append(cutItem);
 210
 211                 // apply icon effect to the cut item
 212                 KIconEffect iconEffect;
 213                 pixmap = iconEffect.apply(pixmap, KIconLoader::Desktop, KIconLoader::DisabledState);
 214                 m_dolphinModel->setData(index, QIcon(pixmap), Qt::DecorationRole);
 215             }
 216         }
 217     }
 218 }
 219
 220 void IconManager::applyHiddenItemEffect(const KFileItem& hiddenItem)
 221 {
 222     const QModelIndex index = m_dolphinModel->indexForItem(hiddenItem);
 223     const QVariant value = m_dolphinModel->data(index, Qt::DecorationRole);
 224     if (value.type() == QVariant::Icon) {
 225         const QIcon icon(qvariant_cast<QIcon>(value));
 226         QPixmap pixmap = icon.pixmap(m_view->iconSize());
 227         KIconEffect::semiTransparent(pixmap);
 228         m_dolphinModel->setData(index, QIcon(pixmap), Qt::DecorationRole);
 229     }
 230 }
 231
 232 #include "iconmanager.moc"