From 12a5ddf456ba8549645a8cb28a8b4ed6197a14da Mon Sep 17 00:00:00 2001 From: Matthew Vogt Date: Mon, 30 Jan 2012 14:16:15 +1000 Subject: Import relevant source from Qt 4.8 Change-Id: I5078db4081d95290c54f39d3c0efc2fc2f62e6a6 --- src/declarative/util/qdeclarativebind.cpp | 214 ++++++++++++++++++++++++++++++ 1 file changed, 214 insertions(+) create mode 100644 src/declarative/util/qdeclarativebind.cpp (limited to 'src/declarative/util/qdeclarativebind.cpp') diff --git a/src/declarative/util/qdeclarativebind.cpp b/src/declarative/util/qdeclarativebind.cpp new file mode 100644 index 00000000..bd077a81 --- /dev/null +++ b/src/declarative/util/qdeclarativebind.cpp @@ -0,0 +1,214 @@ +/**************************************************************************** +** +** Copyright (C) 2012 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. +** +** $QT_BEGIN_LICENSE:LGPL$ +** GNU Lesser General Public License Usage +** 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. +** +** 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. +** +** Other Usage +** Alternatively, this file may be used in accordance with the terms and +** conditions contained in a signed written agreement between you and Nokia. +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "private/qdeclarativebind_p.h" + +#include "private/qdeclarativenullablevalue_p_p.h" +#include "private/qdeclarativeguard_p.h" + +#include +#include +#include + +#include +#include +#include +#include +#include + +#include + +QT_BEGIN_NAMESPACE + +class QDeclarativeBindPrivate : public QObjectPrivate +{ +public: + QDeclarativeBindPrivate() : when(true), componentComplete(true), obj(0) {} + + bool when : 1; + bool componentComplete : 1; + QDeclarativeGuard obj; + QString prop; + QDeclarativeNullableValue value; +}; + + +/*! + \qmlclass Binding QDeclarativeBind + \ingroup qml-working-with-data + \since 4.7 + \brief The Binding element allows arbitrary property bindings to be created. + + Sometimes it is necessary to bind to a property of an object that wasn't + directly instantiated by QML - generally a property of a class exported + to QML by C++. In these cases, regular property binding doesn't work. Binding + allows you to bind any value to any property. + + For example, imagine a C++ application that maps an "app.enteredText" + property into QML. You could use Binding to update the enteredText property + like this. + \code + TextEdit { id: myTextField; text: "Please type here..." } + Binding { target: app; property: "enteredText"; value: myTextField.text } + \endcode + Whenever the text in the TextEdit is updated, the C++ property will be + updated also. + + If the binding target or binding property is changed, the bound value is + immediately pushed onto the new target. + + \sa QtDeclarative +*/ +QDeclarativeBind::QDeclarativeBind(QObject *parent) + : QObject(*(new QDeclarativeBindPrivate), parent) +{ +} + +QDeclarativeBind::~QDeclarativeBind() +{ +} + +/*! + \qmlproperty bool Binding::when + + This property holds when the binding is active. + This should be set to an expression that evaluates to true when you want the binding to be active. + + \code + Binding { + target: contactName; property: 'text' + value: name; when: list.ListView.isCurrentItem + } + \endcode +*/ +bool QDeclarativeBind::when() const +{ + Q_D(const QDeclarativeBind); + return d->when; +} + +void QDeclarativeBind::setWhen(bool v) +{ + Q_D(QDeclarativeBind); + d->when = v; + eval(); +} + +/*! + \qmlproperty Object Binding::target + + The object to be updated. +*/ +QObject *QDeclarativeBind::object() +{ + Q_D(const QDeclarativeBind); + return d->obj; +} + +void QDeclarativeBind::setObject(QObject *obj) +{ + Q_D(QDeclarativeBind); + d->obj = obj; + eval(); +} + +/*! + \qmlproperty string Binding::property + + The property to be updated. +*/ +QString QDeclarativeBind::property() const +{ + Q_D(const QDeclarativeBind); + return d->prop; +} + +void QDeclarativeBind::setProperty(const QString &p) +{ + Q_D(QDeclarativeBind); + d->prop = p; + eval(); +} + +/*! + \qmlproperty any Binding::value + + The value to be set on the target object and property. This can be a + constant (which isn't very useful), or a bound expression. +*/ +QVariant QDeclarativeBind::value() const +{ + Q_D(const QDeclarativeBind); + return d->value.value; +} + +void QDeclarativeBind::setValue(const QVariant &v) +{ + Q_D(QDeclarativeBind); + d->value.value = v; + d->value.isNull = false; + eval(); +} + +void QDeclarativeBind::classBegin() +{ + Q_D(QDeclarativeBind); + d->componentComplete = false; +} + +void QDeclarativeBind::componentComplete() +{ + Q_D(QDeclarativeBind); + d->componentComplete = true; + eval(); +} + +void QDeclarativeBind::eval() +{ + Q_D(QDeclarativeBind); + if (!d->obj || d->value.isNull || !d->when || !d->componentComplete) + return; + + QDeclarativeProperty prop(d->obj, d->prop); + prop.write(d->value.value); +} + +QT_END_NAMESPACE -- cgit v1.2.3