src/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 #include "dolphiniconsview.h"
  23 #include "dolphinviewcontroller.h"
  24
  25 #include <kdirmodel.h>
  26 #include <kfileitem.h>
  27 #include <kicon.h>
  28 #include <klocale.h>
  29 #include <konq_operations.h>
  30
  31 #include <QAbstractItemView>
  32 #include <QAbstractProxyModel>
  33 #include <QtDBus>
  34 #include <QDrag>
  35 #include <QPainter>
  36
  37 class DragAndDropHelperSingleton
  38 {
  39 public:
  40     DragAndDropHelper instance;
  41 };
  42 K_GLOBAL_STATIC(DragAndDropHelperSingleton, s_dragAndDropHelper)
  43
  44 DragAndDropHelper& DragAndDropHelper::instance()
  45 {
  46     return s_dragAndDropHelper->instance;
  47 }
  48
  49 bool DragAndDropHelper::isMimeDataSupported(const QMimeData* mimeData) const
  50 {
  51     return mimeData->hasUrls() || mimeData->hasFormat("application/x-kde-dndextract");
  52 }
  53
  54 void DragAndDropHelper::startDrag(QAbstractItemView* itemView,
  55                                   Qt::DropActions supportedActions,
  56                                   DolphinViewController* dolphinViewController)
  57 {
  58     // Do not start a new drag until the previous one has been finished.
  59     // This is a (possibly temporary) fix for bug #187884.
  60     static bool isDragging = false;
  61     if (isDragging) {
  62         return;
  63     }
  64     isDragging = true;
  65
  66     const QModelIndexList indexes = itemView->selectionModel()->selectedIndexes();
  67     if (!indexes.isEmpty()) {
  68         QMimeData *data = itemView->model()->mimeData(indexes);
  69         if (data == 0) {
  70             return;
  71         }
  72
  73         if (dolphinViewController != 0) {
  74             dolphinViewController->requestToolTipHiding();
  75         }
  76
  77         QDrag* drag = new QDrag(itemView);
  78         drag->setPixmap(createDragPixmap(itemView));
  79         drag->setMimeData(data);
  80
  81         m_dragSource = itemView;
  82         drag->exec(supportedActions, Qt::IgnoreAction);
  83         m_dragSource = 0;
  84     }
  85     isDragging = false;
  86 }
  87
  88 bool DragAndDropHelper::isDragSource(QAbstractItemView* itemView) const
  89 {
  90     return (m_dragSource != 0) && (m_dragSource == itemView);
  91 }
  92
  93 void DragAndDropHelper::dropUrls(const KFileItem& destItem,
  94                                  const KUrl& destPath,
  95                                  QDropEvent* event,
  96                                  QWidget* widget)
  97 {
  98     const bool dropToItem = !destItem.isNull() && (destItem.isDir() || destItem.isDesktopFile());
  99     const KUrl destination = dropToItem ? destItem.url() : destPath;
 100
 101     const QMimeData* mimeData = event->mimeData();
 102     if (mimeData->hasFormat("application/x-kde-dndextract")) {
 103         QString remoteDBusClient = mimeData->data("application/x-kde-dndextract");
 104         QDBusMessage message = QDBusMessage::createMethodCall(remoteDBusClient, "/DndExtract",
 105                                                               "org.kde.DndExtract", "extractSelectedFilesTo");
 106         message.setArguments(QVariantList() << destination.path());
 107         QDBusConnection::sessionBus().call(message);
 108     } else {
 109         const KUrl::List urls = KUrl::List::fromMimeData(event->mimeData());
 110         const int urlsCount = urls.count();
 111         if (urlsCount == 0) {
 112             // TODO: handle dropping of other data
 113         } else if ((urlsCount == 1) && (urls.first() == destination)) {
 114             emit errorMessage(i18nc("@info:status", "A folder cannot be dropped into itself"));
 115         } else if (dropToItem) {
 116             KonqOperations::doDrop(destItem, destination, event, widget);
 117         } else {
 118             KonqOperations::doDrop(KFileItem(), destination, event, widget);
 119         }
 120     }
 121 }
 122
 123 DragAndDropHelper::DragAndDropHelper()
 124     : m_dragSource(0)
 125 {
 126 }
 127
 128 QPixmap DragAndDropHelper::createDragPixmap(QAbstractItemView* itemView) const
 129 {
 130     const QModelIndexList selectedIndexes = itemView->selectionModel()->selectedIndexes();
 131     Q_ASSERT(!selectedIndexes.isEmpty());
 132
 133     QAbstractProxyModel* proxyModel = static_cast<QAbstractProxyModel*>(itemView->model());
 134     KDirModel* dirModel = static_cast<KDirModel*>(proxyModel->sourceModel());
 135
 136     const int itemCount = selectedIndexes.count();
 137
 138     // If more than one item is dragged, align the items inside a
 139     // rectangular grid. The maximum grid size is limited to 5 x 5 items.
 140     int xCount = 3;
 141     int size = KIconLoader::SizeMedium;
 142     if (itemCount > 16) {
 143         xCount = 5;
 144         size = KIconLoader::SizeSmall;
 145     } else if (itemCount > 9) {
 146         xCount = 4;
 147         size = KIconLoader::SizeSmallMedium;
 148     }
 149
 150     if (itemCount < xCount) {
 151         xCount = itemCount;
 152     }
 153
 154     int yCount = itemCount / xCount;
 155     if (itemCount % xCount != 0) {
 156         ++yCount;
 157     }
 158     if (yCount > xCount) {
 159         yCount = xCount;
 160     }
 161
 162     // Draw the selected items into the grid cells
 163     QPixmap dragPixmap(xCount * size + xCount - 1, yCount * size + yCount - 1);
 164     dragPixmap.fill(Qt::transparent);
 165
 166     QPainter painter(&dragPixmap);
 167     int x = 0;
 168     int y = 0;
 169     foreach (const QModelIndex& selectedIndex, selectedIndexes) {
 170         const QModelIndex index = proxyModel->mapToSource(selectedIndex);
 171         const KFileItem item = dirModel->itemForIndex(index);
 172         const QPixmap pixmap = item.pixmap(size, size);
 173         painter.drawPixmap(x, y, pixmap);
 174
 175         x += size + 1;
 176         if (x >= dragPixmap.width()) {
 177             x = 0;
 178             y += size + 1;
 179         }
 180         if (y >= dragPixmap.height()) {
 181             break;
 182         }
 183     }
 184
 185     return dragPixmap;
 186 }
 187
 188 #include "draganddrophelper.moc"