Say hello to QtQuick module

This change moves the QtQuick 2 types and C++ API (including
SceneGraph) to a new module (AKA library), QtQuick.

99% of this change is moving files from src/declarative to
src/quick, and from tests/auto/declarative to
tests/auto/qtquick2.

The loading of QtQuick 2 ("import QtQuick 2.0") is now delegated to
a plugin, src/imports/qtquick2, just like it's done for QtQuick 1.

All tools, examples, and tests that use QtQuick C++ API have gotten
"QT += quick" or "QT += quick-private" added to their .pro file.

A few additional internal QtDeclarative classes had to be exported
(via Q_DECLARATIVE_PRIVATE_EXPORT) since they're needed by the
QtQuick 2 implementation.

The old header locations (e.g. QtDeclarative/qquickitem.h) will
still be supported for some time, but will produce compile-time
warnings. (To avoid the QtQuick implementation using the
compatibility headers (since QtDeclarative's includepath comes
first), a few include statements were modified, e.g. from
"#include <qsgnode.h>" to "#include <QtQuick/qsgnode.h>".)

There's a change in qtbase that automatically adds QtQuick to the
module list if QtDeclarative is used. Together with the compatibility
headers, this should help reduce the migration pain for existing
projects.

In theory, simply getting an existing QtDeclarative-based project
to compile and link shouldn't require any changes for now -- but
porting to the new scheme is of course recommended, and will
eventually become mandatory.

Task-number: QTBUG-22889
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>
Change-Id: Ia52be9373172ba2f37e7623231ecb060316c96a7
Reviewed-by: Kent Hansen <kent.hansen@nokia.com>
Reviewed-by: Sergio Ahumada <sergio.ahumada@nokia.com>

1 files changed, 309 insertions, 0 deletions

diff --git a/src/quick/util/qdeclarativebind.cpp b/src/quick/util/qdeclarativebind.cpp
new file mode 100644
index 0000000000..20b2caa582
--- /dev/null
+++ b/src/quick/util/qdeclarativebind.cpp
@@ -0,0 +1,309 @@
+/****************************************************************************
+**
+** 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.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 "qdeclarativebind_p.h"
+
+#include <private/qdeclarativenullablevalue_p_p.h>
+#include <private/qdeclarativeproperty_p.h>
+#include <private/qdeclarativebinding_p.h>
+#include <private/qdeclarativeguard_p.h>
+
+#include <qdeclarativeengine.h>
+#include <qdeclarativecontext.h>
+#include <qdeclarativeproperty.h>
+#include <qdeclarativeinfo.h>
+
+#include <QtCore/qfile.h>
+#include <QtCore/qdebug.h>
+
+#include <private/qobject_p.h>
+
+QT_BEGIN_NAMESPACE
+
+class QDeclarativeBindPrivate : public QObjectPrivate
+{
+public:
+    QDeclarativeBindPrivate() : componentComplete(true), obj(0), prevBind(0) {}
+    ~QDeclarativeBindPrivate() { if (prevBind) prevBind->destroy(); }
+
+    QDeclarativeNullableValue<bool> when;
+    bool componentComplete;
+    QDeclarativeGuard<QObject> obj;
+    QString propName;
+    QDeclarativeNullableValue<QVariant> value;
+    QDeclarativeProperty prop;
+    QDeclarativeAbstractBinding *prevBind;
+};
+
+
+/*!
+    \qmlclass Binding QDeclarativeBind
+    \inqmlmodule QtQuick 2
+    \ingroup qml-working-with-data
+    \brief The Binding element allows arbitrary property bindings to be created.
+
+    \section1 Binding to an inaccessible property
+
+    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.
+
+    \section1 "Single-branch" conditional binding
+
+    In some circumstances you may want to control the value of a property
+    only when a certain condition is true (and relinquish control in all
+    other cirumstances). This often isn't possible to accomplish with a direct
+    binding, as you need to supply values for all possible branches.
+
+    \qml
+    // warning: "Unable to assign [undefined] to double value"
+    value: if (mouse.pressed) mouse.mouseX
+    \endqml
+
+    The above example will produce a warning whenever we release the mouse, as the value
+    of the binding is undefined when the mouse isn't pressed. We can use the Binding
+    element to rewrite the above code and avoid the warning.
+
+    \qml
+    Binding on value {
+        when: mouse.pressed
+        value: mouse.mouseX
+    }
+    \endqml
+
+    The Binding element will also restore any previously set direct bindings on
+    the property. In that sense, it functions much like a simplified State.
+
+    \qml
+    // this is equivilant to the above Binding
+    State {
+        name: "pressed"
+        when: mouse.pressed
+        PropertyChanges {
+            target: obj
+            value: mouse.mouseX
+        }
+    }
+    \endqml
+
+    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 QtQuick2::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
+
+    When the binding becomes inactive again, any direct bindings that were previously
+    set on the property will be restored.
+*/
+bool QDeclarativeBind::when() const
+{
+    Q_D(const QDeclarativeBind);
+    return d->when;
+}
+
+void QDeclarativeBind::setWhen(bool v)
+{
+    Q_D(QDeclarativeBind);
+    if (!d->when.isNull && d->when == v)
+        return;
+
+    d->when = v;
+    eval();
+}
+
+/*!
+    \qmlproperty Object QtQuick2::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);
+    if (d->obj && d->when.isValid() && d->when) {
+        /* if we switch the object at runtime, we need to restore the
+           previous binding on the old object before continuing */
+        d->when = false;
+        eval();
+        d->when = true;
+    }
+    d->obj = obj;
+    if (d->componentComplete)
+        d->prop = QDeclarativeProperty(d->obj, d->propName);
+    eval();
+}
+
+/*!
+    \qmlproperty string QtQuick2::Binding::property
+
+    The property to be updated.
+*/
+QString QDeclarativeBind::property() const
+{
+    Q_D(const QDeclarativeBind);
+    return d->propName;
+}
+
+void QDeclarativeBind::setProperty(const QString &p)
+{
+    Q_D(QDeclarativeBind);
+    if (!d->propName.isEmpty() && d->when.isValid() && d->when) {
+        /* if we switch the property name at runtime, we need to restore the
+           previous binding on the old object before continuing */
+        d->when = false;
+        eval();
+        d->when = true;
+    }
+    d->propName = p;
+    if (d->componentComplete)
+        d->prop = QDeclarativeProperty(d->obj, d->propName);
+    eval();
+}
+
+/*!
+    \qmlproperty any QtQuick2::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 = v;
+    eval();
+}
+
+void QDeclarativeBind::setTarget(const QDeclarativeProperty &p)
+{
+    Q_D(QDeclarativeBind);
+    d->prop = p;
+}
+
+void QDeclarativeBind::classBegin()
+{
+    Q_D(QDeclarativeBind);
+    d->componentComplete = false;
+}
+
+void QDeclarativeBind::componentComplete()
+{
+    Q_D(QDeclarativeBind);
+    d->componentComplete = true;
+    if (!d->prop.isValid())
+        d->prop = QDeclarativeProperty(d->obj, d->propName);
+    eval();
+}
+
+void QDeclarativeBind::eval()
+{
+    Q_D(QDeclarativeBind);
+    if (!d->prop.isValid() || d->value.isNull || !d->componentComplete)
+        return;
+
+    if (d->when.isValid()) {
+        if (!d->when) {
+            //restore any previous binding
+            if (d->prevBind) {
+                QDeclarativeAbstractBinding *tmp = d->prevBind;
+                d->prevBind = 0;
+                tmp = QDeclarativePropertyPrivate::setBinding(d->prop, tmp);
+                if (tmp) //should this ever be true?
+                    tmp->destroy();
+            }
+            return;
+        }
+
+        //save any set binding for restoration
+        QDeclarativeAbstractBinding *tmp;
+        tmp = QDeclarativePropertyPrivate::setBinding(d->prop, 0);
+        if (tmp && d->prevBind)
+            d->prevBind->destroy();
+        else if (!d->prevBind)
+            d->prevBind = tmp;
+    }
+
+    d->prop.write(d->value.value);
+}
+
+QT_END_NAMESPACE