summaryrefslogtreecommitdiffstats
path: root/src/qt3support/tools/q3signal.cpp
blob: 8210c154ec7057adc1a101d6ea1f39564712404e (plain)
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
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the Qt3Support module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights.  These rights are described in the Nokia Qt LGPL
** Exception version 1.1, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "q3signal.h"
#include "qmetaobject.h"
#include "qpointer.h"
#include "q3cstring.h"

QT_BEGIN_NAMESPACE

/*!
    \class Q3Signal
    \brief The Q3Signal class can be used to send signals for classes
    that don't inherit QObject.

    \compat

    If you want to send signals from a class that does not inherit
    QObject, you can create an internal Q3Signal object to emit the
    signal. You must also provide a function that connects the signal
    to an outside object slot.  This is how we used to implement
    signals in Qt 3's QMenuData class, which was not a QObject. In Qt
    4, menus contain actions, which are QObjects.

    In general, we recommend inheriting QObject instead. QObject
    provides much more functionality.

    You can set a single QVariant parameter for the signal with
    setValue().

    Note that QObject is a \e private base class of Q3Signal, i.e. you
    cannot call any QObject member functions from a Q3Signal object.

    Example:
    \snippet doc/src/snippets/code/src_qt3support_tools_q3signal.cpp 0
*/

/*!
    Constructs a signal object called \a name, with the parent object
    \a parent. These arguments are passed directly to QObject.
*/

Q3Signal::Q3Signal(QObject *parent, const char *name)
    : QObject(parent, name)
{
#ifndef QT_NO_VARIANT
    val = 0;
#endif
}

/*!
    Destroys the signal. All connections are removed, as is the case
    with all QObjects.
*/
Q3Signal::~Q3Signal()
{
}
#ifndef QT_NO_VARIANT
// Returns true if it matches ".+(.*int.*"
static inline bool intSignature(const char *member)
{
    Q3CString s(member);
    int p = s.find('(');
    return p > 0 && p < s.findRev("int");
}
#endif
/*!
    Connects the signal to \a member in object \a receiver.
    Returns true if the connection is successful.

    \sa disconnect(), QObject::connect()
*/

bool Q3Signal::connect(const QObject *receiver, const char *member)
{
#ifndef QT_NO_VARIANT
    if (intSignature(member))
#endif
	return QObject::connect((QObject *)this, SIGNAL(intSignal(int)), receiver, member);
#ifndef QT_NO_VARIANT
    return QObject::connect((QObject *)this, SIGNAL(signal(QVariant)),
			     receiver, member);
#endif
}

/*!
    Disonnects the signal from \a member in object \a receiver.
    Returns true if the connection existed and the disconnect
    was successful.

    \sa connect(), QObject::disconnect()
*/

bool Q3Signal::disconnect(const QObject *receiver, const char *member)
{
    if (!member)
	return QObject::disconnect((QObject *)this, 0, receiver, member);
#ifndef QT_NO_VARIANT
    if (intSignature(member))
#endif
	return QObject::disconnect((QObject *)this, SIGNAL(intSignal(int)), receiver, member);
#ifndef QT_NO_VARIANT
    return QObject::disconnect((QObject *)this, SIGNAL(signal(QVariant)),
				receiver, member);
#endif
}


/*!
  \fn bool Q3Signal::isBlocked() const
  \obsolete
  Returns true if the signal is blocked, or false if it is not blocked.

  The signal is not blocked by default.

  \sa block(), QObject::signalsBlocked()
*/

/*!
  \fn void Q3Signal::block(bool b)
  \obsolete
  Blocks the signal if \a b is true, or unblocks the signal if \a b is false.

  An activated signal disappears into hyperspace if it is blocked.

  \sa isBlocked(), activate(), QObject::blockSignals()
*/


/*!
    \fn void Q3Signal::activate()

    Emits the signal. If the platform supports QVariant and a
    parameter has been set with setValue(), this value is passed in
    the signal.
*/
void  Q3Signal::activate()
{
#ifndef QT_NO_VARIANT
    /* Create this Q3GuardedPtr on this, if we get destroyed after the intSignal (but before the variant signal)
       we cannot just emit the signal (because val has been destroyed already) */
    QPointer<Q3Signal> me = this;
    if(me)
	emit intSignal(val.toInt());
    if(me)
	emit signal(val);
#else
    emit intSignal(0);
#endif
}

#ifndef QT_NO_VARIANT
/*!
    Sets the signal's parameter to \a value
*/
void Q3Signal::setValue(const QVariant &value)
{
    val = value;
}

/*!
    Returns the signal's parameter
*/
QVariant Q3Signal::value() const
{
    return val;
}
/*! \fn void Q3Signal::signal(const QVariant &)
    \internal
*/
/*! \fn void Q3Signal::intSignal(int)
    \internal
*/

/*! \obsolete */
void Q3Signal::setParameter(int value)
{
    val = value;
}

/*! \obsolete */
int Q3Signal::parameter() const
{
    return val.toInt();
}
#endif //QT_NO_VARIANT

QT_END_NAMESPACE