1 /*
2 * StringPairDrag.cpp - class StringPairDrag which provides general support
3 * for drag'n'drop of string-pairs and which is the base
4 * for all drag'n'drop-actions within LMMS
5 *
6 * Copyright (c) 2005-2008 Tobias Doerffel <tobydox/at/users.sourceforge.net>
7 *
8 * This file is part of LMMS - https://lmms.io
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public
12 * License as published by the Free Software Foundation; either
13 * version 2 of the License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public
21 * License along with this program (see COPYING); if not, write to the
22 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
23 * Boston, MA 02110-1301 USA.
24 *
25 */
26
27
28 #include <QMimeData>
29 #include <QDragEnterEvent>
30
31
32 #include "StringPairDrag.h"
33 #include "GuiApplication.h"
34 #include "MainWindow.h"
35
36
StringPairDrag(const QString & _key,const QString & _value,const QPixmap & _icon,QWidget * _w)37 StringPairDrag::StringPairDrag( const QString & _key, const QString & _value,
38 const QPixmap & _icon, QWidget * _w ) :
39 QDrag( _w )
40 {
41 if( _icon.isNull() && _w )
42 {
43 setPixmap( QPixmap::grabWidget( _w ).scaled(
44 64, 64,
45 Qt::KeepAspectRatio,
46 Qt::SmoothTransformation ) );
47 }
48 else
49 {
50 setPixmap( _icon );
51 }
52 QString txt = _key + ":" + _value;
53 QMimeData * m = new QMimeData();
54 m->setData( mimeType(), txt.toUtf8() );
55 setMimeData( m );
56 start( Qt::IgnoreAction );
57 }
58
59
60
61
~StringPairDrag()62 StringPairDrag::~StringPairDrag()
63 {
64 // during a drag, we might have lost key-press-events, so reset
65 // modifiers of main-win
66 if( gui->mainWindow() )
67 {
68 gui->mainWindow()->clearKeyModifiers();
69 }
70 }
71
72
73
74
processDragEnterEvent(QDragEnterEvent * _dee,const QString & _allowed_keys)75 bool StringPairDrag::processDragEnterEvent( QDragEnterEvent * _dee,
76 const QString & _allowed_keys )
77 {
78 if( !_dee->mimeData()->hasFormat( mimeType() ) )
79 {
80 return( false );
81 }
82 QString txt = _dee->mimeData()->data( mimeType() );
83 if( _allowed_keys.split( ',' ).contains( txt.section( ':', 0, 0 ) ) )
84 {
85 _dee->acceptProposedAction();
86 return( true );
87 }
88 _dee->ignore();
89 return( false );
90 }
91
92
93
94
decodeMimeKey(const QMimeData * mimeData)95 QString StringPairDrag::decodeMimeKey( const QMimeData * mimeData )
96 {
97 return( QString::fromUtf8( mimeData->data( mimeType() ) ).section( ':', 0, 0 ) );
98 }
99
100
101
102
decodeMimeValue(const QMimeData * mimeData)103 QString StringPairDrag::decodeMimeValue( const QMimeData * mimeData )
104 {
105 return( QString::fromUtf8( mimeData->data( mimeType() ) ).section( ':', 1, -1 ) );
106 }
107
108
109
110
decodeKey(QDropEvent * _de)111 QString StringPairDrag::decodeKey( QDropEvent * _de )
112 {
113 return decodeMimeKey( _de->mimeData() );
114 }
115
116
117
118
decodeValue(QDropEvent * _de)119 QString StringPairDrag::decodeValue( QDropEvent * _de )
120 {
121 return decodeMimeValue( _de->mimeData() );
122 }
123