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