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
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
|
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (qt-info@nokia.com)
**
** This file is part of the $MODULE$ of the Qt Toolkit.
**
** $TROLLTECH_DUAL_LICENSE$
**
****************************************************************************/
#include "qabstracttransition.h"
#include "qabstracttransition_p.h"
#include "qabstractstate.h"
#include "qstate.h"
#include "qstatemachine.h"
QT_BEGIN_NAMESPACE
/*!
\class QAbstractTransition
\brief The QAbstractTransition class is the base class of transitions between QAbstractState objects.
\ingroup statemachine
The QAbstractTransition class is the abstract base class of transitions
between states (QAbstractState objects) of a
QStateMachine. QAbstractTransition is part of \l{The State Machine
Framework}.
The QTransition class provides a default (action-based) implementation of
the QAbstractTransition interface.
The sourceState() function returns the source of the transition. The
targetStates() function returns the targets of the transition.
\section1 Subclassing
The eventTest() function is called by the state machine to determine whether
an event should trigger the transition. In your reimplementation you
typically check the event type and cast the event object to the proper type,
and check that one or more properties of the event meet your criteria.
The onTransition() function is called when the transition is triggered;
reimplement this function to perform custom processing for the transition.
*/
/*!
\property QAbstractTransition::source
\brief the source state (parent) of this transition
*/
/*!
\property QAbstractTransition::target
\brief the target state of this transition
*/
/*!
\property QAbstractTransition::targets
\brief the target states of this transition
If multiple states are specified, all must be descendants of the same
parallel group state.
*/
QAbstractTransitionPrivate::QAbstractTransitionPrivate()
{
}
QAbstractTransitionPrivate *QAbstractTransitionPrivate::get(QAbstractTransition *q)
{
return q->d_func();
}
const QAbstractTransitionPrivate *QAbstractTransitionPrivate::get(const QAbstractTransition *q)
{
return q->d_func();
}
QStateMachine *QAbstractTransitionPrivate::machine() const
{
Q_Q(const QAbstractTransition);
QObject *par = q->parent();
while (par != 0) {
if (QStateMachine *mach = qobject_cast<QStateMachine*>(par))
return mach;
par = par->parent();
}
return 0;
}
bool QAbstractTransitionPrivate::callEventTest(QEvent *e) const
{
Q_Q(const QAbstractTransition);
return q->eventTest(e);
}
void QAbstractTransitionPrivate::callOnTransition()
{
Q_Q(QAbstractTransition);
q->onTransition();
}
QState *QAbstractTransitionPrivate::sourceState() const
{
Q_Q(const QAbstractTransition);
return qobject_cast<QState*>(q->parent());
}
/*!
Constructs a new QAbstractTransition object with the given \a sourceState.
*/
QAbstractTransition::QAbstractTransition(QState *sourceState)
: QObject(
#ifndef QT_STATEMACHINE_SOLUTION
*new QAbstractTransitionPrivate,
#endif
sourceState)
#ifdef QT_STATEMACHINE_SOLUTION
, d_ptr(new QAbstractTransitionPrivate)
#endif
{
#ifdef QT_STATEMACHINE_SOLUTION
d_ptr->q_ptr = this;
#endif
}
/*!
Constructs a new QAbstractTransition object with the given \a targets and \a
sourceState.
*/
QAbstractTransition::QAbstractTransition(const QList<QAbstractState*> &targets,
QState *sourceState)
: QObject(
#ifndef QT_STATEMACHINE_SOLUTION
*new QAbstractTransitionPrivate,
#endif
sourceState)
#ifdef QT_STATEMACHINE_SOLUTION
, d_ptr(new QAbstractTransitionPrivate)
#endif
{
#ifdef QT_STATEMACHINE_SOLUTION
d_ptr->q_ptr = this;
#endif
Q_D(QAbstractTransition);
d->targetStates = targets;
}
/*!
\internal
*/
QAbstractTransition::QAbstractTransition(QAbstractTransitionPrivate &dd,
QState *parent)
: QObject(
#ifndef QT_STATEMACHINE_SOLUTION
dd,
#endif
parent)
#ifdef QT_STATEMACHINE_SOLUTION
, d_ptr(&dd)
#endif
{
#ifdef QT_STATEMACHINE_SOLUTION
d_ptr->q_ptr = this;
#endif
}
/*!
\internal
*/
QAbstractTransition::QAbstractTransition(QAbstractTransitionPrivate &dd,
const QList<QAbstractState*> &targets,
QState *parent)
: QObject(
#ifndef QT_STATEMACHINE_SOLUTION
dd,
#endif
parent)
#ifdef QT_STATEMACHINE_SOLUTION
, d_ptr(&dd)
#endif
{
#ifdef QT_STATEMACHINE_SOLUTION
d_ptr->q_ptr = this;
#endif
Q_D(QAbstractTransition);
d->targetStates = targets;
}
/*!
Destroys this transition.
*/
QAbstractTransition::~QAbstractTransition()
{
#ifdef QT_STATEMACHINE_SOLUTION
delete d_ptr;
#endif
}
/*!
Returns the source state of this transition, or 0 if this transition has no
source state.
*/
QState *QAbstractTransition::sourceState() const
{
Q_D(const QAbstractTransition);
return d->sourceState();
}
/*!
Returns the target state of this transition, or 0 if the transition has no
target.
*/
QAbstractState *QAbstractTransition::targetState() const
{
Q_D(const QAbstractTransition);
if (d->targetStates.isEmpty())
return 0;
return d->targetStates.first();
}
/*!
Sets the \a target state of this transition.
*/
void QAbstractTransition::setTargetState(QAbstractState* target)
{
Q_D(QAbstractTransition);
if (!target)
d->targetStates.clear();
else
d->targetStates = QList<QAbstractState*>() << target;
}
/*!
Returns the target states of this transition, or an empty list if this
transition has no target states.
*/
QList<QAbstractState*> QAbstractTransition::targetStates() const
{
Q_D(const QAbstractTransition);
return d->targetStates;
}
/*!
Sets the target states of this transition to be the given \a targets.
*/
void QAbstractTransition::setTargetStates(const QList<QAbstractState*> &targets)
{
Q_D(QAbstractTransition);
d->targetStates = targets;
}
/*!
\fn QAbstractTransition::eventTest(QEvent *event) const
This function is called to determine whether the given \a event should cause
this transition to trigger. Reimplement this function and return true if the
event should trigger the transition, otherwise return false.
*/
/*!
\fn QAbstractTransition::onTransition()
This function is called when the transition is triggered. Reimplement this
function to perform custom processing when the transition is triggered.
*/
/*!
\reimp
*/
bool QAbstractTransition::event(QEvent *e)
{
return QObject::event(e);
}
QT_END_NAMESPACE
|
