aboutsummaryrefslogtreecommitdiffstats
path: root/src/qml/qml/qqmlcontext_p.h
blob: 290b7fc7ee0785a9a09e8437f7537eb8a96af0a4 (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
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtQml 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 QQMLCONTEXT_P_H
#define QQMLCONTEXT_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 "qqmlcontext.h"

#include "qqmldata_p.h"
#include "qqmltypenamecache_p.h"
#include "qqmlnotifier_p.h"
#include "qqmllist.h"

#include <QtCore/qhash.h>
#include <QtQml/qjsvalue.h>
#include <QtCore/qset.h>

#include <private/qobject_p.h>
#include <private/qflagpointer_p.h>
#include <private/qqmlguard_p.h>

#include <private/qv4compileddata_p.h>
#include <private/qv4identifier_p.h>

QT_BEGIN_NAMESPACE

class QQmlContext;
class QQmlExpression;
class QQmlEngine;
class QQmlExpression;
class QQmlExpressionPrivate;
class QQmlJavaScriptExpression;
class QQmlContextData;
class QQmlGuardedContextData;
class QQmlIncubatorPrivate;

class QQmlContextPrivate : public QObjectPrivate
{
    Q_DECLARE_PUBLIC(QQmlContext)
public:
    QQmlContextPrivate();

    QQmlContextData *data;

    QList<QVariant> propertyValues;
    int notifyIndex;

    static QQmlContextPrivate *get(QQmlContext *context) {
        return static_cast<QQmlContextPrivate *>(QObjectPrivate::get(context));
    }
    static QQmlContext *get(QQmlContextPrivate *context) {
        return static_cast<QQmlContext *>(context->q_func());
    }

    // Only used for debugging
    QList<QPointer<QObject> > instances;

    static int context_count(QQmlListProperty<QObject> *);
    static QObject *context_at(QQmlListProperty<QObject> *, int);
};

class QQmlComponentAttached;

class Q_QML_PRIVATE_EXPORT QQmlContextData
{
public:
    QQmlContextData();
    QQmlContextData(QQmlContext *);
    void emitDestruction();
    void clearContext();
    void clearContextRecursively();
    void invalidate();

    inline bool isValid() const {
        return engine && (!isInternal || !contextObject || !QObjectPrivate::get(contextObject)->wasDeleted);
    }

    // My parent context and engine
    QQmlContextData *parent = nullptr;
    QQmlEngine *engine;

    void setParent(QQmlContextData *, bool stronglyReferencedByParent = false);
    void refreshExpressions();

    void addObject(QObject *);

    QUrl resolvedUrl(const QUrl &);

    // My containing QQmlContext.  If isInternal is true this owns publicContext.
    // If internal is false publicContext owns this.
    QQmlContext *asQQmlContext();
    QQmlContextPrivate *asQQmlContextPrivate();
    quint32 refCount = 0;
    quint32 isInternal:1;
    quint32 isJSContext:1;
    quint32 isPragmaLibraryContext:1;
    quint32 unresolvedNames:1; // True if expressions in this context failed to resolve a toplevel name
    quint32 hasEmittedDestruction:1;
    quint32 isRootObjectInCreation:1;
    quint32 stronglyReferencedByParent:1;
    quint32 dummy:25;
    QQmlContext *publicContext;

    // The incubator that is constructing this context if any
    QQmlIncubatorPrivate *incubator;

    // Compilation unit for contexts that belong to a compiled type.
    QQmlRefPointer<QV4::CompiledData::CompilationUnit> typeCompilationUnit;

    // object index in CompiledData::Unit to component that created this context
    int componentObjectIndex;

    void initFromTypeCompilationUnit(const QQmlRefPointer<QV4::CompiledData::CompilationUnit> &unit, int subComponentIndex);

    // flag indicates whether the context owns the cache (after mutation) or not.
    mutable QV4::IdentifierHash propertyNameCache;
    const QV4::IdentifierHash &propertyNames() const;
    QV4::IdentifierHash &detachedPropertyNames();

    // Context object
    QObject *contextObject;

    // Any script blocks that exist on this context
    QV4::PersistentValue importedScripts; // This is a JS Array

    QUrl baseUrl;
    QString baseUrlString;

    QUrl url() const;
    QString urlString() const;

    // List of imports that apply to this context
    QQmlRefPointer<QQmlTypeNameCache> imports;

    // My children
    QQmlContextData *childContexts = nullptr;

    // My peers in parent's childContexts list
    QQmlContextData  *nextChild;
    QQmlContextData **prevChild;

    // Expressions that use this context
    QQmlJavaScriptExpression *expressions;

    // Doubly-linked list of objects that are owned by this context
    QQmlData *contextObjects;

    // Doubly-linked list of context guards (XXX merge with contextObjects)
    QQmlGuardedContextData *contextGuards = nullptr;

    // id guards
    struct ContextGuard : public QQmlGuard<QObject>
    {
        inline ContextGuard();
        inline ContextGuard &operator=(QObject *obj);
        inline void objectDestroyed(QObject *) override;

        inline bool wasSet() const;

        QFlagPointer<QQmlContextData> context;
        QQmlNotifier bindings;
    };
    ContextGuard *idValues;
    int idValueCount;
    void setIdProperty(int, QObject *);

    // Linked contexts. this owns linkedContext.
    QQmlContextDataRef linkedContext;

    // Linked list of uses of the Component attached property in this
    // context
    QQmlComponentAttached *componentAttached;

    // Return the outermost id for obj, if any.
    QString findObjectId(const QObject *obj) const;

    static QQmlContextData *get(QQmlContext *context) {
        return QQmlContextPrivate::get(context)->data;
    }

private:
    friend class QQmlContextDataRef;
    friend class QQmlContext; // needs to do manual refcounting :/
    void refreshExpressionsRecursive(bool isGlobal);
    void refreshExpressionsRecursive(QQmlJavaScriptExpression *);
    ~QQmlContextData();
    void destroy();
};


class QQmlGuardedContextData
{
public:
    inline QQmlGuardedContextData() = default;
    inline QQmlGuardedContextData(QQmlContextData *data)
    { setContextData(data); }
    inline ~QQmlGuardedContextData()
    { clear(); }

    inline QQmlContextData *contextData() const
    { return m_contextData; }
    inline void setContextData(QQmlContextData *);

    inline bool isNull() const { return !m_contextData; }

    inline operator QQmlContextData*() const { return m_contextData; }
    inline QQmlContextData* operator->() const { return m_contextData; }
    inline QQmlGuardedContextData &operator=(QQmlContextData *d) {
        setContextData(d); return *this;
    }

private:
    QQmlGuardedContextData &operator=(const QQmlGuardedContextData &) = delete;
    QQmlGuardedContextData(const QQmlGuardedContextData &) = delete;
    friend class QQmlContextData;

    inline void clear();

    QQmlContextData *m_contextData = nullptr;
    QQmlGuardedContextData  *m_next = nullptr;
    QQmlGuardedContextData **m_prev = nullptr;
};


void QQmlGuardedContextData::setContextData(QQmlContextData *contextData)
 {
    if (m_contextData == contextData)
        return;
    clear();

    if (contextData) {
        m_contextData = contextData;
        m_next = contextData->contextGuards;
        if (m_next) m_next->m_prev = &m_next;
        m_prev = &contextData->contextGuards;
        contextData->contextGuards = this;
    }
}

void QQmlGuardedContextData::clear()
{
    if (m_prev) {
        *m_prev = m_next;
        if (m_next) m_next->m_prev = m_prev;
        m_contextData = nullptr;
        m_next = nullptr;
        m_prev = nullptr;
    }
}

QQmlContextDataRef::QQmlContextDataRef()
    : m_contextData(nullptr)
{
}

QQmlContextDataRef::QQmlContextDataRef(const QQmlContextDataRef &other)
    : m_contextData(other.m_contextData)
{
    if (m_contextData)
        ++m_contextData->refCount;
}

QQmlContextDataRef::QQmlContextDataRef(QQmlContextData *data)
    : m_contextData(data)
{
    if (m_contextData)
        ++m_contextData->refCount;
}

QQmlContextDataRef::~QQmlContextDataRef()
{
    clear();
}

void QQmlContextDataRef::setContextData(QQmlContextData *contextData)
{
    if (m_contextData == contextData)
        return;
    clear();

    if (contextData) {
        m_contextData = contextData;
        ++m_contextData->refCount;
    }
}

QQmlContextData *QQmlContextDataRef::contextData() const
{
    return m_contextData;
}

void QQmlContextDataRef::clear()
{
    if (m_contextData && !--m_contextData->refCount)
        m_contextData->destroy();
    m_contextData = nullptr;
}

QQmlContextDataRef &
QQmlContextDataRef::operator=(QQmlContextData *d)
{
    setContextData(d);
    return *this;
}

QQmlContextDataRef &
QQmlContextDataRef::operator=(const QQmlContextDataRef &other)
{
    setContextData(other.m_contextData);
    return *this;
}

QQmlContextData::ContextGuard::ContextGuard()
: context(nullptr)
{
}

QQmlContextData::ContextGuard &QQmlContextData::ContextGuard::operator=(QObject *obj)
{
    QQmlGuard<QObject>::operator=(obj);
    context.setFlag();
    bindings.notify(); // For alias connections
    return *this;
}

void QQmlContextData::ContextGuard::objectDestroyed(QObject *)
{
    if (context->contextObject && !QObjectPrivate::get(context->contextObject)->wasDeleted)
        bindings.notify();
}

bool QQmlContextData::ContextGuard::wasSet() const
{
    return context.flag();
}

QT_END_NAMESPACE

#endif // QQMLCONTEXT_P_H