Hi Superpelican
Why don't you post the QML / UI part of your code, so we can see how
you think your QML should respond to your QDeclarativePropertyMap?
Does your PropertyMap have an onXXXXChanged event? That would be one
QML way of allowing UI components to respond to property changes.
You could also try posting this question on the Qt Project Forum - I
suspect it is more of a Qt question than a SailfishOS specific one, so
you could leverage all the Qt knowledge there.
Grüsse
Chris
Zitat von Superpelican <superpeli...@zoho.com>:
I'm trying to create a hybrid QML/C++ application, where the logic
is written in C++ and the interface is QML/Sailfish Silica based.
I'm currently playing around with the different ways to let QML/C++
communicate with each other. I currently have this code:
<code>
#include <QApplication>
#include <QGraphicsObject>
#include <QDir>
#include <QDeclarativeView>
#include <QDeclarativeContext>
#include <QDeclarativeEngine>
#include <QDeclarativeComponent>
#include <QDebug>
#include <QDeclarativePropertyMap>
#ifdef HAS_BOOSTER
#include <MDeclarativeCache>
#endif
Q_DECL_EXPORT int main(int argc, char *argv[])
{
#ifdef HAS_BOOSTER
QScopedPointer<QApplication>
myapp(MDeclarativeCache::qApplication(argc, argv));
#else
QScopedPointer<QApplication> myapp = new QApplication(argc, argv);
#endif
#ifdef HAS_BOOSTER
QScopedPointer<QDeclarativeView>
appview(MDeclarativeCache::qDeclarativeView());
#else
QScopedPointer<QDeclarativeView>(new QDeclarativeView);
#endif
QDeclarativePropertyMap binding_map;
binding_map.insert("question_txt", QVariant(QString("5 * 5 =")));
binding_map.insert("color", QVariant(QString("dark red")));
QScopedPointer<QDeclarativeContext>
binding_context(appview->rootContext());
binding_context->setContextProperty("binding_map", &binding_map);
QString file = "main.qml";
QString path = QString(DEPLOYMENT_PATH);
appview->setSource(QUrl::fromLocalFile(path + file));
appview->setResizeMode(QDeclarativeView::SizeRootObjectToView);
appview->setAttribute(Qt::WA_OpaquePaintEvent);
appview->setAttribute(Qt::WA_NoSystemBackground);
appview->viewport()->setAttribute(Qt::WA_OpaquePaintEvent);
appview->viewport()->setAttribute(Qt::WA_NoSystemBackground);
appview->showFullScreen();
binding_map["question_txt"] = QVariant(QString("overwritten 5 * 5 ="));
return myapp->exec();
}
</code>
I need to let C++ print text in the QML interface (the question) and
C++ has to obtain the
answer the user has answered in the QML interface (TextField Silica
component). That's basically
the needed communication between C++ and QML.
So I thought that I'd create a QDeclarativePropertyMap in C++. This
propertymap will contain the question.
My program has a while loop that asks the user new questions each
time the loop runs(the logic code can be found here
<https://bitbucket.org/Superpelican/clamshell_cli>,
but it hasn't been adjusted for use with a GUI, it's currently a CLI
application). So I need to constantly update the QML UI from C++
while the programs running, after I've setup the QDeclarativeView etc.
However I noticed that if you change a value in the propertymap
after initializing and showing the QDeclarativeView, the UI won't be
updated!
I thought the QDeclarativePropertyMap was dynamic!
http://qt-project.org/doc/qt-4.8/qdeclarativepropertymap.html#details: "The
binding is dynamic - whenever a key's value is updated, anything
bound to that key will be updated as well."
Kind Regards,
Superpelican
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