summaryrefslogtreecommitdiffstats
path: root/src/kernel/qsignal.cpp
blob: acc74829f9a4540728363caaafc1639b61a14e2c (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
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
/****************************************************************************
**
** Implementation of TQSignal class
**
** Created : 941201
**
** Copyright (C) 1992-2008 Trolltech ASA.  All rights reserved.
**
** This file is part of the kernel module of the TQt GUI Toolkit.
**
** This file may be used under the terms of the GNU General
** Public License versions 2.0 or 3.0 as published by the Free
** Software Foundation and appearing in the files LICENSE.GPL2
** and LICENSE.GPL3 included in the packaging of this file.
** Alternatively you may (at your option) use any later version
** of the GNU General Public License if such license has been
** publicly approved by Trolltech ASA (or its successors, if any)
** and the KDE Free TQt Foundation.
**
** Please review the following information to ensure GNU General
** Public Licensing requirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/.
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at sales@trolltech.com.
**
** This file may be used under the terms of the Q Public License as
** defined by Trolltech ASA and appearing in the file LICENSE.TQPL
** included in the packaging of this file.  Licensees holding valid TQt
** Commercial 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 WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
** herein.
**
**********************************************************************/

#include "ntqsignal.h"
#include "ntqmetaobject.h"
#include "ntqguardedptr.h"

/*!
    \class TQSignal ntqsignal.h
    \brief The TQSignal class can be used to send signals for classes
    that don't inherit TQObject.

    \ingroup io
    \ingroup misc

    If you want to send signals from a class that does not inherit
    TQObject, you can create an internal TQSignal object to emit the
    signal. You must also provide a function that connects the signal
    to an outside object slot.  This is how we have implemented
    signals in the TQMenuData class, which is not a TQObject.

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

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

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

    Example:
    \code
	#include <ntqsignal.h>

	class MyClass
	{
	public:
	    MyClass();
	    ~MyClass();

	    void doSomething();

	    void connect( TQObject *receiver, const char *member );

	private:
	    TQSignal *sig;
	};

	MyClass::MyClass()
	{
	    sig = new TQSignal;
	}

	MyClass::~MyClass()
	{
	    delete sig;
	}

	void MyClass::doSomething()
	{
	    // ... does something
	    sig->activate(); // emits the signal
	}

	void MyClass::connect( TQObject *receiver, const char *member )
	{
	    sig->connect( receiver, member );
	}
    \endcode
*/

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

TQSignal::TQSignal( TQObject *parent, const char *name )
    : TQObject( parent, name )
{
    isSignal = TRUE;
#ifndef QT_NO_VARIANT
    val = 0;
#endif
}

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

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

bool TQSignal::connect( const TQObject *receiver, const char *member )
{
#ifndef QT_NO_VARIANT
    if ( intSignature( member ) )
#endif
	return TQObject::connect( (TQObject *)this, SIGNAL(intSignal(int)), receiver, member );
#ifndef QT_NO_VARIANT
    return TQObject::connect( (TQObject *)this, SIGNAL(signal(const TQVariant&)),
			     receiver, member );
#endif
}

/*!
    Disonnects the signal from \a member in object \a receiver.

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

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


/*!
  \fn bool TQSignal::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(), TQObject::signalsBlocked()
*/

/*!
  \fn void TQSignal::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(), TQObject::blockSignals()
*/


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

    Emits the signal. If the platform supports TQVariant and a
    parameter has been set with setValue(), this value is passed in
    the signal.
*/
void  TQSignal::activate()
{
#ifndef QT_NO_VARIANT
    /* Create this TQGuardedPtr 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) */
    TQGuardedPtr<TQSignal> 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 TQSignal::setValue( const TQVariant &value )
{
    val = value;
}

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

#ifndef QT_NO_COMPAT
/*! \obsolete */
void TQSignal::setParameter( int value )
{
    val = value;
}

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