summaryrefslogtreecommitdiffstats
path: root/src/declarative/qml/qdeclarativeexpression_p.h
blob: 1d25609c91b190110362727fbbc08344afce008b (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
/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtDeclarative 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.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QDECLARATIVEEXPRESSION_P_H
#define QDECLARATIVEEXPRESSION_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 "qdeclarativeexpression.h"

#include "private/qdeclarativeengine_p.h"
#include "private/qdeclarativeguard_p.h"

#include <QtScript/qscriptvalue.h>

QT_BEGIN_NAMESPACE

class QDeclarativeAbstractExpression
{
public:
    QDeclarativeAbstractExpression();
    virtual ~QDeclarativeAbstractExpression();

    bool isValid() const;

    QDeclarativeContextData *context() const;
    void setContext(QDeclarativeContextData *);

    virtual void refresh();

private:
    friend class QDeclarativeContext;
    friend class QDeclarativeContextData;
    friend class QDeclarativeContextPrivate;
    QDeclarativeContextData *m_context;
    QDeclarativeAbstractExpression **m_prevExpression;
    QDeclarativeAbstractExpression  *m_nextExpression;
};

class QDeclarativeDelayedError 
{
public:
    inline QDeclarativeDelayedError() : nextError(0), prevError(0) {}
    inline ~QDeclarativeDelayedError() { removeError(); }

    QDeclarativeError error;

    bool addError(QDeclarativeEnginePrivate *);

    inline void removeError() {
        if (!prevError) return;
        if (nextError) nextError->prevError = prevError;
        *prevError = nextError;
        nextError = 0;
        prevError = 0;
    }

private:
    QDeclarativeDelayedError  *nextError;
    QDeclarativeDelayedError **prevError;
};

class QDeclarativeQtScriptExpression : public QDeclarativeAbstractExpression, 
                                       public QDeclarativeDelayedError
{
public:
    enum Mode { SharedContext, ExplicitContext };

    QDeclarativeQtScriptExpression();
    virtual ~QDeclarativeQtScriptExpression();

    QDeclarativeRefCount *dataRef;

    QString expression;

    Mode expressionFunctionMode;
    QScriptValue expressionFunction;

    QScriptValue expressionContext; // Only used in ExplicitContext
    QObject *scopeObject;           // Only used in SharedContext

    bool notifyOnValueChange() const;
    void setNotifyOnValueChange(bool);
    void resetNotifyOnChange();
    void setNotifyObject(QObject *, int );

    QScriptValue scriptValue(QObject *secondaryScope, bool *isUndefined);

    class DeleteWatcher {
    public:
        inline DeleteWatcher(QDeclarativeQtScriptExpression *data);
        inline ~DeleteWatcher();
        inline bool wasDeleted() const;
    private:
        bool *m_wasDeleted;
        bool m_wasDeletedStorage;
        QDeclarativeQtScriptExpression *m_d;
    };

private:
    void clearGuards();
    QScriptValue eval(QObject *secondaryScope, bool *isUndefined);
    void updateGuards(const QPODVector<QDeclarativeEnginePrivate::CapturedProperty> &properties);

    bool trackChange;

    QDeclarativeNotifierEndpoint *guardList;
    int guardListLength;

    QObject *guardObject;
    int guardObjectNotifyIndex;
    bool *deleted;
};

class QDeclarativeExpression;
class QString;
class QDeclarativeExpressionPrivate : public QObjectPrivate, public QDeclarativeQtScriptExpression
{
    Q_DECLARE_PUBLIC(QDeclarativeExpression)
public:
    QDeclarativeExpressionPrivate();
    ~QDeclarativeExpressionPrivate();

    void init(QDeclarativeContextData *, const QString &, QObject *);
    void init(QDeclarativeContextData *, void *, QDeclarativeRefCount *, QObject *, const QString &, int);

    QVariant value(QObject *secondaryScope = 0, bool *isUndefined = 0);
    QScriptValue scriptValue(QObject *secondaryScope = 0, bool *isUndefined = 0);

    static QDeclarativeExpressionPrivate *get(QDeclarativeExpression *expr) {
        return static_cast<QDeclarativeExpressionPrivate *>(QObjectPrivate::get(expr));
    }
    static QDeclarativeExpression *get(QDeclarativeExpressionPrivate *expr) {
        return expr->q_func();
    }

    void _q_notify();
    virtual void emitValueChanged();

    static void exceptionToError(QScriptEngine *, QDeclarativeError &);
    static QScriptValue evalInObjectScope(QDeclarativeContextData *, QObject *, const QString &, const QString &,
                                          int, QScriptValue *);
    static QScriptValue evalInObjectScope(QDeclarativeContextData *, QObject *, const QScriptProgram &, 
                                          QScriptValue *);

    bool expressionFunctionValid:1;

    QString url; // This is a QString for a reason.  QUrls are slooooooow...
    int line;
    QByteArray name; //function name, hint for the debugger
};

QDeclarativeQtScriptExpression::DeleteWatcher::DeleteWatcher(QDeclarativeQtScriptExpression *data)
: m_wasDeletedStorage(false), m_d(data) 
{
    if (!m_d->deleted) 
        m_d->deleted = &m_wasDeletedStorage; 
    m_wasDeleted = m_d->deleted;
}

QDeclarativeQtScriptExpression::DeleteWatcher::~DeleteWatcher() 
{
    if (false == *m_wasDeleted && m_wasDeleted == m_d->deleted)
        m_d->deleted = 0;
}

bool QDeclarativeQtScriptExpression::DeleteWatcher::wasDeleted() const 
{ 
    return *m_wasDeleted; 
}

QT_END_NAMESPACE

#endif // QDECLARATIVEEXPRESSION_P_H