src/views/draganddrophelper.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2007 by Peter Penz <peter.penz@gmx.at>                  *
   3  *   Copyright (C) 2007 by David Faure <faure@kde.org>                     *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
  19  ***************************************************************************/
  20
  21 #include "draganddrophelper.h"
  22
  23 #include <kdirmodel.h>
  24 #include <kfileitem.h>
  25 #include <kicon.h>
  26 #include <klocale.h>
  27 #include <konq_operations.h>
  28
  29 #include "views/dolphiniconsview.h"
  30 #include "views/dolphinviewcontroller.h"
  31
  32 #include <QAbstractItemView>
  33 #include <QAbstractProxyModel>
  34 #include <QtDBus>
  35 #include <QDrag>
  36 #include <QPainter>
  37
  38 class DragAndDropHelperSingleton
  39 {
  40 public:
  41     DragAndDropHelper instance;
  42 };
  43 K_GLOBAL_STATIC(DragAndDropHelperSingleton, s_dragAndDropHelper)
  44
  45 DragAndDropHelper& DragAndDropHelper::instance()
  46 {
  47     return s_dragAndDropHelper->instance;
  48 }
  49
  50 bool DragAndDropHelper::isMimeDataSupported(const QMimeData* mimeData) const
  51 {
  52     // We support everything, cf KonqOperations::doDrop which can save any data.
  53     //return mimeData->hasUrls() || mimeData->hasFormat("application/x-kde-dndextract");
  54     Q_UNUSED(mimeData);
  55     return true;
  56 }
  57
  58 void DragAndDropHelper::startDrag(QAbstractItemView* itemView,
  59                                   Qt::DropActions supportedActions,
  60                                   DolphinViewController* dolphinViewController)
  61 {
  62     // Do not start a new drag until the previous one has been finished.
  63     // This is a (possibly temporary) fix for bug #187884.
  64     static bool isDragging = false;
  65     if (isDragging) {
  66         return;
  67     }
  68     isDragging = true;
  69
  70     const QModelIndexList indexes = itemView->selectionModel()->selectedIndexes();
  71     if (!indexes.isEmpty()) {
  72         QMimeData *data = itemView->model()->mimeData(indexes);
  73         if (data == 0) {
  74             return;
  75         }
  76
  77         if (dolphinViewController != 0) {
  78             dolphinViewController->requestToolTipHiding();
  79         }
  80
  81         QDrag* drag = new QDrag(itemView);
  82         drag->setPixmap(createDragPixmap(itemView));
  83         drag->setMimeData(data);
  84
  85         m_dragSource = itemView;
  86         drag->exec(supportedActions, Qt::IgnoreAction);
  87         m_dragSource = 0;
  88     }
  89     isDragging = false;
  90 }
  91
  92 bool DragAndDropHelper::isDragSource(QAbstractItemView* itemView) const
  93 {
  94     return (m_dragSource != 0) && (m_dragSource == itemView);
  95 }
  96
  97 void DragAndDropHelper::dropUrls(const KFileItem& destItem,
  98                                  const KUrl& destPath,
  99                                  QDropEvent* event,
 100                                  QWidget* widget)
 101 {
 102     const bool dropToItem = !destItem.isNull() && (destItem.isDir() || destItem.isDesktopFile());
 103     const KUrl destination = dropToItem ? destItem.url() : destPath;
 104
 105     const QMimeData* mimeData = event->mimeData();
 106     if (mimeData->hasFormat("application/x-kde-dndextract")) {
 107         QString remoteDBusClient = mimeData->data("application/x-kde-dndextract");
 108         QDBusMessage message = QDBusMessage::createMethodCall(remoteDBusClient, "/DndExtract",
 109                                                               "org.kde.DndExtract", "extractSelectedFilesTo");
 110         message.setArguments(QVariantList() << destination.path());
 111         QDBusConnection::sessionBus().call(message);
 112     } else {
 113         const KUrl::List urls = KUrl::List::fromMimeData(event->mimeData());
 114         const int urlsCount = urls.count();
 115         if ((urlsCount == 1) && (urls.first() == destination)) {
 116             emit errorMessage(i18nc("@info:status", "A folder cannot be dropped into itself"));
 117         } else if (dropToItem) {
 118             KonqOperations::doDrop(destItem, destination, event, widget);
 119         } else {
 120             KonqOperations::doDrop(KFileItem(), destination, event, widget);
 121         }
 122     }
 123 }
 124
 125 DragAndDropHelper::DragAndDropHelper()
 126     : m_dragSource(0)
 127 {
 128 }
 129
 130 QPixmap DragAndDropHelper::createDragPixmap(QAbstractItemView* itemView) const
 131 {
 132     const QModelIndexList selectedIndexes = itemView->selectionModel()->selectedIndexes();
 133     Q_ASSERT(!selectedIndexes.isEmpty());
 134
 135     QAbstractProxyModel* proxyModel = static_cast<QAbstractProxyModel*>(itemView->model());
 136     KDirModel* dirModel = static_cast<KDirModel*>(proxyModel->sourceModel());
 137
 138     const int itemCount = selectedIndexes.count();
 139
 140     // If more than one item is dragged, align the items inside a
 141     // rectangular grid. The maximum grid size is limited to 5 x 5 items.
 142     int xCount = 3;
 143     int size = KIconLoader::SizeMedium;
 144     if (itemCount > 16) {
 145         xCount = 5;
 146         size = KIconLoader::SizeSmall;
 147     } else if (itemCount > 9) {
 148         xCount = 4;
 149         size = KIconLoader::SizeSmallMedium;
 150     }
 151
 152     if (itemCount < xCount) {
 153         xCount = itemCount;
 154     }
 155
 156     int yCount = itemCount / xCount;
 157     if (itemCount % xCount != 0) {
 158         ++yCount;
 159     }
 160     if (yCount > xCount) {
 161         yCount = xCount;
 162     }
 163
 164     // Draw the selected items into the grid cells
 165     QPixmap dragPixmap(xCount * size + xCount - 1, yCount * size + yCount - 1);
 166     dragPixmap.fill(Qt::transparent);
 167
 168     QPainter painter(&dragPixmap);
 169     int x = 0;
 170     int y = 0;
 171     foreach (const QModelIndex& selectedIndex, selectedIndexes) {
 172         const QModelIndex index = proxyModel->mapToSource(selectedIndex);
 173         const KFileItem item = dirModel->itemForIndex(index);
 174         const QPixmap pixmap = item.pixmap(size, size);
 175         painter.drawPixmap(x, y, pixmap);
 176
 177         x += size + 1;
 178         if (x >= dragPixmap.width()) {
 179             x = 0;
 180             y += size + 1;
 181         }
 182         if (y >= dragPixmap.height()) {
 183             break;
 184         }
 185     }
 186
 187     return dragPixmap;
 188 }
 189
 190 #include "draganddrophelper.moc"