kdeui Library API Documentation

kcolordrag.cpp

00001 /* This file is part of the KDE libraries
00002    Copyright (C) 1999 Steffen Hansen (hansen@kde.org)
00003 
00004    This library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Library General Public
00006    License as published by the Free Software Foundation; either
00007    version 2 of the License, or (at your option) any later version.
00008 
00009    This library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Library General Public License for more details.
00013 
00014    You should have received a copy of the GNU Library General Public License
00015    along with this library; see the file COPYING.LIB.  If not, write to
00016    the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
00017    Boston, MA 02111-1307, USA.
00018 */
00019 /*
00020  * $Id: kcolordrag.cpp,v 1.5 2002/03/04 00:51:46 lunakl Exp $
00021  *
00022  * $Log: kcolordrag.cpp,v $
00023  * Revision 1.5  2002/03/04 00:51:46  lunakl
00024  * Keep BC changes (the patch is almost 100KiB of boring stuff
00025  * ... anybody willing to review? ;) ).
00026  *
00027  * Revision 1.4  2001/10/15 18:04:25  gehrmab
00028  * The preferred location for constructing C++ objects is in the constructor ;-)
00029  *
00030  * Revision 1.3  2001/08/26 20:14:19  lunakl
00031  * Ok, watch closely :
00032  * const is your friend !
00033  *
00034  * static int blah[] = { 1, 2, .... }
00035  * should be
00036  * static const int blah[] = { 1, 2, ... }
00037  *
00038  * static const char* txt[] = { "blah", "foo", ... }
00039  * should be
00040  * static const char* const txt[] = { "blah", "foo", ... }
00041  *
00042  * And just in case you wonder about those const_cast< const char** >, that's
00043  * because QPixmap( const char** xpm ) and QImage( const char** xpm ) got it
00044  * wrong too. Everybody guessing correctly where the const is missing wins
00045  * a free cvs update.
00046  *
00047  * Revision 1.2  2000/02/12 12:46:41  espen
00048  * Added a black frame around the drag pixmap. Looks better.
00049  *
00050  * Revision 1.1  1999/05/06 02:46:13  steffen
00051  * Drag&drop for colors. Qt drag&drop is really easy to use. We should have stuff like this all over KDE.
00052  *
00053  *
00054  */
00055 
00056 #include <qpainter.h> 
00057 #include "kcolordrag.h"
00058 
00059 static const char * const color_mime_string = "application/x-color";
00060 
00061 KColorDrag::KColorDrag( const QColor &color, QWidget *dragsource, 
00062             const char *name) 
00063      : QStoredDrag( color_mime_string, dragsource, name)
00064 {
00065      setColor( color);
00066 }
00067 
00068 KColorDrag::KColorDrag( QWidget *dragsource, const char *name)
00069      : QStoredDrag( color_mime_string, dragsource, name)
00070 {
00071     setColor( white );
00072 }
00073 
00074 void
00075 KColorDrag::setColor( const QColor &color)
00076 {
00077      QByteArray data;
00078      // A short int for each of R G B Alpha (compatible with gtk);
00079      unsigned short int  rgba[4];
00080      data.resize( sizeof(rgba));
00081      rgba[0] = color.red()   * 0xFF;
00082      rgba[1] = color.green() * 0xFF;
00083      rgba[2] = color.blue()  * 0xFF;
00084      rgba[3] = 0xFFFF; // Alpha not supported yet.
00085      memcpy( data.data(), rgba, sizeof( rgba));
00086      setEncodedData( data);
00087 
00088      QPixmap colorpix( 25, 20);
00089      colorpix.fill( color);
00090      QPainter p( &colorpix );
00091      p.setPen( black );
00092      p.drawRect(0,0,25,20);
00093      p.end();
00094      setPixmap(colorpix, QPoint(-5,-7));
00095 }
00096 
00097 bool 
00098 KColorDrag::canDecode( QMimeSource *e)
00099 {
00100      return e->provides( color_mime_string);
00101 }
00102 
00103 bool
00104 KColorDrag::decode( QMimeSource *e, QColor &color)
00105 {
00106      QByteArray data = e->encodedData( color_mime_string);
00107      unsigned short int rgba[4];
00108      if( data.size() != sizeof(rgba)) return false;
00109      memcpy( rgba, data.data(), sizeof( rgba));
00110      color.setRgb( rgba[0] / 0xFF, rgba[1] / 0xFF, rgba[2] / 0xFF); 
00111      return true;
00112 }
00113 
00114 
00115 KColorDrag* 
00116 KColorDrag::makeDrag( const QColor &color,QWidget *dragsource)
00117 {
00118      return new KColorDrag( color, dragsource);
00119 }
00120 
00121 void KColorDrag::virtual_hook( int, void* )
00122 { /*BASE::virtual_hook( id, data );*/ }
00123 
00124 #include "kcolordrag.moc"
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