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