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kcolormimedata.cpp

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00001 /* This file is part of the KDE libraries
00002    Copyright (C) 1999 Steffen Hansen (hansen@kde.org)
00003    Copyright (C) 2005 Joseph Wenninger (jowenn@kde.org)
00004 
00005    This library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Library General Public
00007    License as published by the Free Software Foundation; either
00008    version 2 of the License, or (at your option) any later version.
00009 
00010    This library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Library General Public License for more details.
00014 
00015    You should have received a copy of the GNU Library General Public License
00016    along with this library; see the file COPYING.LIB.  If not, write to
00017    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
00018    Boston, MA 02110-1301, USA.
00019 */
00020 
00021 #include "kcolormimedata.h"
00022 
00023 #include <QColor>
00024 #include <QDrag>
00025 #include <QMimeData>
00026 #include <QPainter>
00027 
00028 void
00029 KColorMimeData::populateMimeData(QMimeData *mimeData, const QColor &color)
00030 {
00031     mimeData->setColorData(color);
00032     mimeData->setText(color.name());
00033 }
00034 
00035 bool
00036 KColorMimeData::canDecode(const QMimeData *mimeData)
00037 {
00038     if (mimeData->hasColor())
00039         return true;
00040     if (mimeData->hasText())
00041     {
00042         const QString colorName=mimeData->text();
00043         if ((colorName.length() >= 4) && (colorName[0] == '#'))
00044             return true;
00045     }
00046     return false;
00047 }
00048 
00049 QColor
00050 KColorMimeData::fromMimeData(const QMimeData *mimeData)
00051 {
00052     if (mimeData->hasColor())
00053         return mimeData->colorData().value<QColor>();
00054     if (canDecode(mimeData))
00055         return QColor(mimeData->text());
00056     return QColor();
00057 }
00058 
00059 
00060 QDrag*
00061 KColorMimeData::createDrag(const QColor &color, QWidget *dragsource)
00062 {
00063     QDrag *drag=new QDrag(dragsource);
00064     QMimeData *mime=new QMimeData;
00065     populateMimeData(mime,color);
00066     drag->setMimeData(mime);
00067     QPixmap colorpix( 25, 20 );
00068     colorpix.fill( color );
00069     QPainter p( &colorpix );
00070     p.setPen( Qt::black );
00071     p.drawRect(0,0,24,19);
00072     p.end();
00073     drag->setPixmap(colorpix);
00074     drag->setHotSpot(QPoint(-5,-7));
00075     return drag;
00076 }

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