summaryrefslogtreecommitdiffstats
path: root/src/declarative/qml/qdeclarativefastproperties.cpp
blob: 1d6ef1bad970beb6ce67066e9a9ed1f04521a56b (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
/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtDeclarative 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 Digia.  For licensing terms and
** conditions see http://qt.digia.com/licensing.  For further information
** use the contact form at http://qt.digia.com/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 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, Digia gives you certain additional
** rights.  These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "private/qdeclarativefastproperties_p.h"

#include <private/qdeclarativeitem_p.h>

QT_BEGIN_NAMESPACE

// Adding entries to the QDeclarativeFastProperties class allows the QML 
// binding optimizer to bypass Qt's meta system and read and, more 
// importantly, subscribe to properties directly.  Any property that is
// primarily read from bindings is a candidate for inclusion as a fast 
// property.

static void QObject_objectName(QObject *object, void *output, QDeclarativeNotifierEndpoint *endpoint)
{
    if (endpoint) 
        endpoint->connect(QDeclarativeData::get(object, true)->objectNameNotifier());
    *((QString *)output) = object->objectName();
}

QDeclarativeFastProperties::QDeclarativeFastProperties()
{
    add(&QDeclarativeItem::staticMetaObject, QDeclarativeItem::staticMetaObject.indexOfProperty("parent"),
        QDeclarativeItemPrivate::parentProperty);
    add(&QObject::staticMetaObject, QObject::staticMetaObject.indexOfProperty("objectName"),
        QObject_objectName);    
}

int QDeclarativeFastProperties::accessorIndexForProperty(const QMetaObject *metaObject, int propertyIndex)
{
    Q_ASSERT(metaObject);
    Q_ASSERT(propertyIndex >= 0);

    // Find the "real" metaObject
    while (metaObject->propertyOffset() > propertyIndex) 
        metaObject = metaObject->superClass();

    QHash<QPair<const QMetaObject *, int>, int>::Iterator iter = 
        m_index.find(qMakePair(metaObject, propertyIndex));
    if (iter != m_index.end())
        return *iter;
    else
        return -1;
}

void QDeclarativeFastProperties::add(const QMetaObject *metaObject, int propertyIndex, Accessor accessor)
{
    Q_ASSERT(metaObject);
    Q_ASSERT(propertyIndex >= 0);

    // Find the "real" metaObject
    while (metaObject->propertyOffset() > propertyIndex) 
        metaObject = metaObject->superClass();

    QPair<const QMetaObject *, int> data = qMakePair(metaObject, propertyIndex);
    int accessorIndex = m_accessors.count();
    m_accessors.append(accessor);
    m_index.insert(data, accessorIndex);
}

QT_END_NAMESPACE