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
|
/******************************************************************************
*
* Copyright (C) 2002 Hugo PEREIRA <mailto: hugo.pereira@free.fr>
*
* This is free software; you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option) any later
* version.
*
* This software is distributed in the hope that it will be useful, but WITHOUT
* Any WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*
*******************************************************************************/
#include "DragMonitor.h"
#include <QApplication>
#include <QMouseEvent>
//_____________________________________________________________
DragMonitor::DragMonitor( QWidget* parent ):
QObject( parent ),
Counter( "DragMonitor::DragMonitor" ),
dragEnabled_( true ),
dragInProgress_( false )
{
parent->installEventFilter(this);
setWindowGraggingEnabled(false);
}
//_____________________________________________________________
void DragMonitor::setWindowGraggingEnabled( bool value )
{ parent()->setProperty( "_kde_no_window_grab", !value ); }
//_____________________________________________________________
bool DragMonitor::eventFilter( QObject* target, QEvent* event )
{
if( target != parent() ) return false;
switch( event->type() )
{
case QEvent::MouseButtonPress:
{
QMouseEvent* mouseEvent( static_cast<QMouseEvent*>(event) );
if( dragEnabled_ && mouseEvent->button() == Qt::LeftButton && mouseEvent->modifiers() == Qt::NoModifier )
{
dragInProgress_ = true;
dragOrigin_ = mouseEvent->pos();
}
return false;
}
case QEvent::MouseMove:
{
QMouseEvent* mouseEvent( static_cast<QMouseEvent*>(event) );
if( dragEnabled_ && ((mouseEvent->buttons() & Qt::LeftButton) && dragInProgress_ ) &&
( mouseEvent->pos() - dragOrigin_ ).manhattanLength() >= QApplication::startDragDistance() )
{
emit dragStarted( dragOrigin_ );
dragInProgress_ = false;
}
return false;
}
case QEvent::MouseButtonRelease:
{
dragInProgress_ = false;
return false;
}
default: return false;
}
}
|
