workspace/plasma/shells/common/customdragtreeview.cpp

   1 /*
   2  *   Copyright (C) 2007 Ivan Cukic <ivan.cukic+kde@gmail.com>
   3  *
   4  *   This program is free software; you can redistribute it and/or modify
   5  *   it under the terms of the GNU Library/Lesser General Public License
   6  *   version 2, or (at your option) any later version, as published by the
   7  *   Free Software Foundation
   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 Library/Lesser General Public
  15  *   License 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 "customdragtreeview_p.h"
  21 #include "kcategorizeditemsview_p.h"
  22
  23 #define PIX_SIZE 64
  24 #define MAX_OFFSET 16
  25 #define MAX_COUNT 5
  26
  27 CustomDragTreeView::CustomDragTreeView(QWidget * parent)
  28     : QTreeView(parent) {}
  29
  30 void CustomDragTreeView::startDrag(Qt::DropActions supportedActions)
  31 {
  32     Q_UNUSED(supportedActions);
  33
  34     // TODO: calculate real size for pixmap - using the icon sizes, not fixed
  35     //       like now
  36
  37     if (!m_view) {
  38         return;
  39     }
  40
  41     QModelIndexList indexes = selectedIndexes();
  42     if (indexes.count() > 0) {
  43         QMimeData *data = model()->mimeData(indexes);
  44         if (!data) {
  45             return;
  46         }
  47
  48         int size = PIX_SIZE + (qMin(MAX_COUNT, indexes.count()) * MAX_OFFSET);
  49         int off  = MAX_OFFSET;
  50         if (indexes.count() > MAX_COUNT) {
  51             off = (MAX_OFFSET * MAX_COUNT) / indexes.count();
  52         }
  53
  54         //kDebug() << "Size: " << size << " Off: " << off << "\n";
  55
  56         QPixmap pixmap(size, size);
  57         pixmap.fill(QColor(255, 255, 255, 0)); // TODO: Transparent. Now it flickers when it's transparent
  58         QPainter painter(&pixmap);
  59         QRect rect(0, 0, PIX_SIZE, PIX_SIZE);
  60
  61         foreach (const QModelIndex &index, indexes) {
  62             if (index.column() != 0) {
  63                 continue;
  64             }
  65
  66             KCategorizedItemsViewModels::AbstractItem * item =
  67                 m_view->getItemByProxyIndex(index);
  68
  69             if (item) {
  70                 rect.setSize(item->icon().actualSize(QSize(PIX_SIZE, PIX_SIZE)));
  71                 //painter.fillRect(rect, QBrush(QColor(255, 255, 255))); // TODO: Use global palettes
  72                 item->icon().paint(&painter, rect);
  73                 rect.moveTopLeft(rect.topLeft() + QPoint(off, off));
  74             }
  75         }
  76         painter.end();
  77
  78         QDrag *drag = new QDrag(this);
  79         drag->setPixmap(pixmap);
  80         drag->setMimeData(data);
  81         drag->start(supportedActions);
  82         //drag->setHotSpot(d->pressedPosition - rect.topLeft());
  83         //if (drag->start(supportedActions) == Qt::MoveAction)
  84         //    d->clearOrRemove();
  85     }
  86 }
  87