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-rw-r--r--src/declarative/qml/qdeclarativeproperty.cpp61
-rw-r--r--src/declarative/qml/qdeclarativeproperty.h3
-rw-r--r--src/declarative/qml/qdeclarativeproperty_p.h1
3 files changed, 43 insertions, 22 deletions
diff --git a/src/declarative/qml/qdeclarativeproperty.cpp b/src/declarative/qml/qdeclarativeproperty.cpp
index 7ead1b5..fbea6ac 100644
--- a/src/declarative/qml/qdeclarativeproperty.cpp
+++ b/src/declarative/qml/qdeclarativeproperty.cpp
@@ -63,10 +63,30 @@
QT_BEGIN_NAMESPACE
/*!
- \class QDeclarativeProperty
- \brief The QDeclarativeProperty class abstracts accessing QML properties.
- \internal
- */
+\class QDeclarativeProperty
+\brief The QDeclarativeProperty class abstracts accessing properties on objects created from QML.
+
+As QML uses Qt's meta-type system all of the existing QMetaObject classes can be used to introspect
+and interact with objects created by QML. However, some of the new features provided by QML - such
+as type safety and attached properties - are most easily used through the QDeclarativeProperty class
+that simplifies some of their natural complexity.
+
+Unlike QMetaProperty which represents a property on a class type, QDeclarativeProperty encapsulates
+a property on a specific object instance. To read a property's value, programmers create a
+QDeclarativeProperty instance and call the read() method. Likewise to write a property value the
+write() method is used.
+
+\code
+
+QObject *object = declarativeComponent.create();
+
+QDeclarativeProperty property(object, "font.pixelSize");
+qWarning() << "Current pixel size:" << property.read().toInt();
+property.write(24);
+qWarning() << "Pixel size should now be 24:" << property.read().toInt();
+
+\endcode
+*/
/*!
Create an invalid QDeclarativeProperty.
@@ -298,7 +318,7 @@ QDeclarativePropertyPrivate::propertyTypeCategory() const
{
uint type = q->type();
- if (type & QDeclarativeProperty::ValueTypeProperty) {
+ if (isValueType()) {
return QDeclarativeProperty::Normal;
} else if (type & QDeclarativeProperty::Property) {
int type = propertyType();
@@ -323,7 +343,7 @@ QDeclarativePropertyPrivate::propertyTypeCategory() const
*/
const char *QDeclarativeProperty::propertyTypeName() const
{
- if (type() & ValueTypeProperty) {
+ if (d->isValueType()) {
QDeclarativeEnginePrivate *ep = QDeclarativeEnginePrivate::get(d->context);
QDeclarativeValueType *valueType = 0;
@@ -365,10 +385,15 @@ int QDeclarativeProperty::propertyType() const
return d->propertyType();
}
+bool QDeclarativePropertyPrivate::isValueType() const
+{
+ return valueType.valueTypeCoreIdx != -1;
+}
+
int QDeclarativePropertyPrivate::propertyType() const
{
uint type = q->type();
- if (type & QDeclarativeProperty::ValueTypeProperty) {
+ if (isValueType()) {
return valueType.valueTypePropType;
} else if (type & QDeclarativeProperty::Property) {
if (core.propType == (int)QVariant::LastType)
@@ -387,8 +412,6 @@ QDeclarativeProperty::Type QDeclarativeProperty::type() const
{
if (d->core.flags & QDeclarativePropertyCache::Data::IsFunction)
return SignalProperty;
- else if (d->valueType.valueTypeCoreIdx != -1)
- return (Type)(Property | ValueTypeProperty);
else if (d->core.isValid())
return (Type)(Property | ((d->isDefaultProperty)?Default:0));
else
@@ -495,7 +518,7 @@ QString QDeclarativeProperty::name() const
if (!d->isNameCached) {
// ###
if (!d->object) {
- } else if (type() & ValueTypeProperty) {
+ } else if (d->isValueType()) {
QString rv = d->core.name(d->object) + QLatin1Char('.');
QDeclarativeEnginePrivate *ep = d->context?QDeclarativeEnginePrivate::get(d->context->engine()):0;
@@ -709,8 +732,7 @@ QVariant QDeclarativeProperty::read() const
QVariant QDeclarativePropertyPrivate::readValueProperty()
{
- uint type = q->type();
- if(type & QDeclarativeProperty::ValueTypeProperty) {
+ if(isValueType()) {
QDeclarativeEnginePrivate *ep = QDeclarativeEnginePrivate::get(context);
QDeclarativeValueType *valueType = 0;
@@ -789,8 +811,7 @@ bool QDeclarativePropertyPrivate::writeValueProperty(const QVariant &value, Writ
}
bool rv = false;
- uint type = q->type();
- if (type & QDeclarativeProperty::ValueTypeProperty) {
+ if (isValueType()) {
QDeclarativeEnginePrivate *ep = QDeclarativeEnginePrivate::get(context);
QDeclarativeValueType *writeBack = 0;
@@ -1097,7 +1118,7 @@ int QDeclarativePropertyPrivate::valueTypeCoreIndex(const QDeclarativeProperty &
}
struct SerializedData {
- QDeclarativeProperty::Type type;
+ bool isValueType;
QDeclarativePropertyCache::Data core;
};
@@ -1112,7 +1133,7 @@ QByteArray QDeclarativePropertyPrivate::saveValueType(const QMetaObject *metaObj
QMetaProperty subProp = subObject->property(subIndex);
ValueTypeSerializedData sd;
- sd.type = QDeclarativeProperty::ValueTypeProperty;
+ sd.isValueType = true;
sd.core.load(metaObject->property(index));
sd.valueType.flags = QDeclarativePropertyCache::Data::flagsForProperty(subProp);
sd.valueType.valueTypeCoreIdx = subIndex;
@@ -1126,7 +1147,7 @@ QByteArray QDeclarativePropertyPrivate::saveValueType(const QMetaObject *metaObj
QByteArray QDeclarativePropertyPrivate::saveProperty(const QMetaObject *metaObject, int index)
{
SerializedData sd;
- sd.type = QDeclarativeProperty::Property;
+ sd.isValueType = false;
sd.core.load(metaObject->property(index));
QByteArray rv((const char *)&sd, sizeof(sd));
@@ -1145,12 +1166,12 @@ QDeclarativePropertyPrivate::restore(const QByteArray &data, QObject *object, QD
prop.d->context = ctxt;
const SerializedData *sd = (const SerializedData *)data.constData();
- if (sd->type == QDeclarativeProperty::Property) {
- prop.d->core = sd->core;
- } else if(sd->type == QDeclarativeProperty::ValueTypeProperty) {
+ if (sd->isValueType) {
const ValueTypeSerializedData *vt = (const ValueTypeSerializedData *)sd;
prop.d->core = vt->core;
prop.d->valueType = vt->valueType;
+ } else {
+ prop.d->core = sd->core;
}
return prop;
diff --git a/src/declarative/qml/qdeclarativeproperty.h b/src/declarative/qml/qdeclarativeproperty.h
index be1065e..3504a15 100644
--- a/src/declarative/qml/qdeclarativeproperty.h
+++ b/src/declarative/qml/qdeclarativeproperty.h
@@ -73,8 +73,7 @@ public:
enum Type { Invalid = 0x00,
Property = 0x01,
SignalProperty = 0x02,
- Default = 0x08,
- ValueTypeProperty = 0x10
+ Default = 0x08
};
QDeclarativeProperty();
diff --git a/src/declarative/qml/qdeclarativeproperty_p.h b/src/declarative/qml/qdeclarativeproperty_p.h
index d0ad09c..eb5fa9a 100644
--- a/src/declarative/qml/qdeclarativeproperty_p.h
+++ b/src/declarative/qml/qdeclarativeproperty_p.h
@@ -97,6 +97,7 @@ public:
QMetaMethod findSignal(QObject *, const QString &);
+ bool isValueType() const;
int propertyType() const;
QDeclarativeProperty::PropertyTypeCategory propertyTypeCategory() const;
generated by cgit v0.12 at 2024-10-24 15:23:55 (GMT)