summaryrefslogtreecommitdiffstats
path: root/src/corelib/statemachine/qstatemachine_p.h
blob: f3366ca5f7d9f02d990641f9a34816fac50bdc47 (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
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QSTATEMACHINE_P_H
#define QSTATEMACHINE_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include "private/qstate_p.h"

#include <QtCore/qcoreevent.h>
#include <QtCore/qhash.h>
#include <QtCore/qlist.h>
#include <QtCore/qmutex.h>
#include <QtCore/qpair.h>
#include <QtCore/qpointer.h>
#include <QtCore/qset.h>
#include <QtCore/qvector.h>
#include <private/qfreelist_p.h>

QT_REQUIRE_CONFIG(statemachine);

QT_BEGIN_NAMESPACE

class QEvent;
#if QT_CONFIG(qeventtransition)
class QEventTransition;
#endif
class QSignalEventGenerator;
class QSignalTransition;
class QAbstractState;
class QAbstractTransition;
class QFinalState;
class QHistoryState;
class QState;

#if QT_CONFIG(animation)
class QAbstractAnimation;
#endif

struct CalculationCache;
class QStateMachine;
class Q_CORE_EXPORT QStateMachinePrivate : public QStatePrivate
{
    Q_DECLARE_PUBLIC(QStateMachine)
public:
    enum State {
        NotRunning,
        Starting,
        Running
    };
    enum EventProcessingMode {
        DirectProcessing,
        QueuedProcessing
    };
    enum StopProcessingReason {
        EventQueueEmpty,
        Finished,
        Stopped
    };

    QStateMachinePrivate();
    ~QStateMachinePrivate();

    static QStateMachinePrivate *get(QStateMachine *q)
    { return q ? q->d_func() : 0; }

    QState *findLCA(const QList<QAbstractState*> &states, bool onlyCompound = false) const;
    QState *findLCCA(const QList<QAbstractState*> &states) const;

    static bool transitionStateEntryLessThan(QAbstractTransition *t1, QAbstractTransition *t2);
    static bool stateEntryLessThan(QAbstractState *s1, QAbstractState *s2);
    static bool stateExitLessThan(QAbstractState *s1, QAbstractState *s2);

    QAbstractState *findErrorState(QAbstractState *context);
    void setError(QStateMachine::Error error, QAbstractState *currentContext);

    // private slots
    void _q_start();
    void _q_process();
#if QT_CONFIG(animation)
    void _q_animationFinished();
#endif
    void _q_startDelayedEventTimer(int id, int delay);
    void _q_killDelayedEventTimer(int id, int timerId);

    QState *rootState() const;

    void clearHistory();
    QAbstractTransition *createInitialTransition() const;

    void removeConflictingTransitions(QList<QAbstractTransition*> &enabledTransitions, CalculationCache *cache);
    void microstep(QEvent *event, const QList<QAbstractTransition*> &transitionList, CalculationCache *cache);
    QList<QAbstractTransition *> selectTransitions(QEvent *event, CalculationCache *cache);
    virtual void noMicrostep();
    virtual void processedPendingEvents(bool didChange);
    virtual void beginMacrostep();
    virtual void endMacrostep(bool didChange);
    virtual void exitInterpreter();
    virtual void exitStates(QEvent *event, const QList<QAbstractState *> &statesToExit_sorted,
                            const QHash<QAbstractState*, QVector<QPropertyAssignment> > &assignmentsForEnteredStates);
    QList<QAbstractState*> computeExitSet(const QList<QAbstractTransition*> &enabledTransitions, CalculationCache *cache);
    QSet<QAbstractState*> computeExitSet_Unordered(const QList<QAbstractTransition*> &enabledTransitions, CalculationCache *cache);
    QSet<QAbstractState*> computeExitSet_Unordered(QAbstractTransition *t, CalculationCache *cache);
    void executeTransitionContent(QEvent *event, const QList<QAbstractTransition*> &transitionList);
    virtual void enterStates(QEvent *event, const QList<QAbstractState*> &exitedStates_sorted,
                             const QList<QAbstractState*> &statesToEnter_sorted,
                             const QSet<QAbstractState*> &statesForDefaultEntry,
                             QHash<QAbstractState *, QVector<QPropertyAssignment> > &propertyAssignmentsForState
#if QT_CONFIG(animation)
                     , const QList<QAbstractAnimation*> &selectedAnimations
#endif
                     );
    QList<QAbstractState*> computeEntrySet(const QList<QAbstractTransition*> &enabledTransitions,
                                           QSet<QAbstractState*> &statesForDefaultEntry, CalculationCache *cache);
    QAbstractState *getTransitionDomain(QAbstractTransition *t,
                                        const QList<QAbstractState *> &effectiveTargetStates,
                                        CalculationCache *cache) const;
    void addDescendantStatesToEnter(QAbstractState *state,
                                    QSet<QAbstractState*> &statesToEnter,
                                    QSet<QAbstractState*> &statesForDefaultEntry);
    void addAncestorStatesToEnter(QAbstractState *s, QAbstractState *ancestor,
                                  QSet<QAbstractState*> &statesToEnter,
                                  QSet<QAbstractState*> &statesForDefaultEntry);

    static QState *toStandardState(QAbstractState *state);
    static const QState *toStandardState(const QAbstractState *state);
    static QFinalState *toFinalState(QAbstractState *state);
    static QHistoryState *toHistoryState(QAbstractState *state);

    bool isInFinalState(QAbstractState *s) const;
    static bool isFinal(const QAbstractState *s);
    static bool isParallel(const QAbstractState *s);
    bool isCompound(const QAbstractState *s) const;
    bool isAtomic(const QAbstractState *s) const;

    void goToState(QAbstractState *targetState);

    void registerTransitions(QAbstractState *state);
    void maybeRegisterTransition(QAbstractTransition *transition);
    void registerTransition(QAbstractTransition *transition);
    void maybeRegisterSignalTransition(QSignalTransition *transition);
    void registerSignalTransition(QSignalTransition *transition);
    void unregisterSignalTransition(QSignalTransition *transition);
    void registerMultiThreadedSignalTransitions();
#if QT_CONFIG(qeventtransition)
    void maybeRegisterEventTransition(QEventTransition *transition);
    void registerEventTransition(QEventTransition *transition);
    void unregisterEventTransition(QEventTransition *transition);
    void handleFilteredEvent(QObject *watched, QEvent *event);
#endif
    void unregisterTransition(QAbstractTransition *transition);
    void unregisterAllTransitions();
    void handleTransitionSignal(QObject *sender, int signalIndex,
                                void **args);

    void postInternalEvent(QEvent *e);
    void postExternalEvent(QEvent *e);
    QEvent *dequeueInternalEvent();
    QEvent *dequeueExternalEvent();
    bool isInternalEventQueueEmpty();
    bool isExternalEventQueueEmpty();
    void processEvents(EventProcessingMode processingMode);
    void cancelAllDelayedEvents();

    virtual void emitStateFinished(QState *forState, QFinalState *guiltyState);
    virtual void startupHook();

#ifndef QT_NO_PROPERTIES
    class RestorableId {
        QPointer<QObject> guard;
        QObject *obj;
        QByteArray prop;
        // two overloads because friends can't have default arguments
        friend uint qHash(const RestorableId &key, uint seed)
            Q_DECL_NOEXCEPT_EXPR(noexcept(qHash(std::declval<QByteArray>())))
        { return qHash(qMakePair(key.obj, key.prop), seed); }
        friend uint qHash(const RestorableId &key) Q_DECL_NOEXCEPT_EXPR(noexcept(qHash(key, 0U)))
        { return qHash(key, 0U); }
        friend bool operator==(const RestorableId &lhs, const RestorableId &rhs) Q_DECL_NOTHROW
        { return lhs.obj == rhs.obj && lhs.prop == rhs.prop; }
        friend bool operator!=(const RestorableId &lhs, const RestorableId &rhs) Q_DECL_NOTHROW
        { return !operator==(lhs, rhs); }
    public:
        explicit RestorableId(QObject *o, QByteArray p) Q_DECL_NOTHROW : guard(o), obj(o), prop(qMove(p)) {}
        QObject *object() const Q_DECL_NOTHROW { return guard; }
        QByteArray propertyName() const Q_DECL_NOTHROW { return prop; }
    };
    QHash<QAbstractState*, QHash<RestorableId, QVariant> > registeredRestorablesForState;
    bool hasRestorable(QAbstractState *state, QObject *object, const QByteArray &propertyName) const;
    QVariant savedValueForRestorable(const QList<QAbstractState*> &exitedStates_sorted,
                                     QObject *object, const QByteArray &propertyName) const;
    void registerRestorable(QAbstractState *state, QObject *object, const QByteArray &propertyName,
                            const QVariant &value);
    void unregisterRestorables(const QList<QAbstractState*> &states, QObject *object,
                               const QByteArray &propertyName);
    QVector<QPropertyAssignment> restorablesToPropertyList(const QHash<RestorableId, QVariant> &restorables) const;
    QHash<RestorableId, QVariant> computePendingRestorables(const QList<QAbstractState*> &statesToExit_sorted) const;
    QHash<QAbstractState*, QVector<QPropertyAssignment> > computePropertyAssignments(
            const QList<QAbstractState*> &statesToEnter_sorted,
            QHash<RestorableId, QVariant> &pendingRestorables) const;
#endif

    State state;
    bool processing;
    bool processingScheduled;
    bool stop;
    StopProcessingReason stopProcessingReason;
    QSet<QAbstractState*> configuration;
    QList<QEvent*> internalEventQueue;
    QList<QEvent*> externalEventQueue;
    QMutex internalEventMutex;
    QMutex externalEventMutex;

    QStateMachine::Error error;
    QState::RestorePolicy globalRestorePolicy;

    QString errorString;
    QSet<QAbstractState *> pendingErrorStates;
    QSet<QAbstractState *> pendingErrorStatesForDefaultEntry;

#if QT_CONFIG(animation)
    bool animated;

    struct InitializeAnimationResult {
        QList<QAbstractAnimation*> handledAnimations;
        QList<QAbstractAnimation*> localResetEndValues;

        void swap(InitializeAnimationResult &other) Q_DECL_NOTHROW
        {
            qSwap(handledAnimations,   other.handledAnimations);
            qSwap(localResetEndValues, other.localResetEndValues);
        }
    };

    InitializeAnimationResult
        initializeAnimation(QAbstractAnimation *abstractAnimation,
                            const QPropertyAssignment &prop);

    QHash<QAbstractState*, QList<QAbstractAnimation*> > animationsForState;
    QHash<QAbstractAnimation*, QPropertyAssignment> propertyForAnimation;
    QHash<QAbstractAnimation*, QAbstractState*> stateForAnimation;
    QSet<QAbstractAnimation*> resetAnimationEndValues;

    QList<QAbstractAnimation *> defaultAnimations;
    QMultiHash<QAbstractState *, QAbstractAnimation *> defaultAnimationsForSource;
    QMultiHash<QAbstractState *, QAbstractAnimation *> defaultAnimationsForTarget;

    QList<QAbstractAnimation *> selectAnimations(const QList<QAbstractTransition *> &transitionList) const;
    void terminateActiveAnimations(QAbstractState *state,
            const QHash<QAbstractState*, QVector<QPropertyAssignment> > &assignmentsForEnteredStates);
    void initializeAnimations(QAbstractState *state, const QList<QAbstractAnimation*> &selectedAnimations,
                              const QList<QAbstractState *> &exitedStates_sorted,
                              QHash<QAbstractState *, QVector<QPropertyAssignment> > &assignmentsForEnteredStates);
#endif // animation

    QSignalEventGenerator *signalEventGenerator;

    QHash<const QObject*, QVector<int> > connections;
    QMutex connectionsMutex;
#if QT_CONFIG(qeventtransition)
    QHash<QObject*, QHash<QEvent::Type, int> > qobjectEvents;
#endif
    QFreeList<void> delayedEventIdFreeList;
    struct DelayedEvent {
        QEvent *event;
        int timerId;
        DelayedEvent(QEvent *e, int tid)
            : event(e), timerId(tid) {}
        DelayedEvent()
            : event(0), timerId(0) {}
    };
    QHash<int, DelayedEvent> delayedEvents;
    QHash<int, int> timerIdToDelayedEventId;
    QMutex delayedEventsMutex;

    typedef QEvent* (*f_cloneEvent)(QEvent*);
    struct Handler {
        f_cloneEvent cloneEvent;
    };

    static const Handler *handler;
};
#if QT_CONFIG(animation)
Q_DECLARE_SHARED(QStateMachinePrivate::InitializeAnimationResult)
#endif

Q_CORE_EXPORT const QStateMachinePrivate::Handler *qcoreStateMachineHandler();

QT_END_NAMESPACE

#endif