1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
|
/**********************************************************************
** Copyright (C) 2002 Trolltech AS. All rights reserved.
**
** This file is part of TQt Designer.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** Licensees holding valid TQt Enterprise Edition or TQt Professional Edition
** licenses may use this file in accordance with the TQt Commercial License
** Agreement provided with the Software.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.trolltech.com/gpl/ for GPL licensing information.
** See http://www.trolltech.com/pricing.html or email [email protected] for
** information about TQt Commercial License Agreements.
**
** Contact [email protected] if any conditions of this licensing are
** not clear to you.
**
**********************************************************************/
#include "listdnd.h"
#include <tqwidget.h>
#include <tqpainter.h>
ListDnd::ListDnd( TQScrollView * eventSource, const char * name )
: TQObject( eventSource, name ),
dragInside( FALSE ), dragDelete( TRUE ), dropConfirmed( FALSE ), dMode( Both )
{
src = eventSource;
src->setAcceptDrops( TRUE );
src->installEventFilter( this );
src->viewport()->installEventFilter( this );
line = new TQWidget( src->viewport(), 0, TQt::WStyle_NoBorder | WStyle_StaysOnTop );
line->setBackgroundColor( TQt::black );
line->resize( src->viewport()->width(), 2 );
line->hide();
}
void ListDnd::setDragMode( int mode )
{
dMode = mode;
}
int ListDnd::dragMode() const
{
return dMode;
}
bool ListDnd::eventFilter( TQObject *, TQEvent * event )
{
switch ( event->type() ) {
case TQEvent::DragEnter:
return dragEnterEvent( (TQDragEnterEvent *) event );
case TQEvent::DragLeave:
return dragLeaveEvent( (TQDragLeaveEvent *) event );
case TQEvent::DragMove:
return dragMoveEvent( (TQDragMoveEvent *) event );
case TQEvent::Drop:
return dropEvent( (TQDropEvent *) event );
case TQEvent::MouseButtonPress:
return mousePressEvent( (TQMouseEvent *) event );
case TQEvent::MouseMove:
return mouseMoveEvent( (TQMouseEvent *) event );
default:
break;
}
return FALSE;
}
bool ListDnd::dragEnterEvent( TQDragEnterEvent * event )
{
if ( dMode == None ) {
return TRUE;
}
bool ok = ( ( ( dMode & Both ) == Both ) ||
( ( dMode & Internal ) && ( event->source() == src ) ) ||
( ( dMode & External ) && ( event->source() != src ) ) );
if ( ok && canDecode( event ) ) {
event->accept();
dragInside = TRUE;
if ( !( dMode & NullDrop ) ) {
updateLine( event->pos() );
line->show();
}
}
return TRUE;
}
bool ListDnd::dragLeaveEvent( TQDragLeaveEvent * )
{
dragInside = FALSE;
line->hide();
return TRUE;
}
bool ListDnd::dragMoveEvent( TQDragMoveEvent * event )
{
if ( dragInside && dMode && !( dMode & NullDrop ) ) {
updateLine( event->pos() );
}
return TRUE;
}
bool ListDnd::dropEvent( TQDropEvent * )
{
// do nothing
return FALSE;
}
bool ListDnd::mousePressEvent( TQMouseEvent * event )
{
if ( event->button() == Qt::LeftButton )
mousePressPos = event->pos();
return FALSE;
}
bool ListDnd::mouseMoveEvent( TQMouseEvent * )
{
// do nothing
return FALSE;
}
void ListDnd::updateLine( const TQPoint & )
{
// do nothing
}
bool ListDnd::canDecode( TQDragEnterEvent * )
{
// do nothing
return FALSE;
}
|
