[SOLVED]binding from C++: value can not updated automatically

[unixmania]

hi.
i implemented my own Object derived class and embeded it to qml context. Code as

@
class my_class : public QObject
{
Q_OBJECT
Q_PROPERTY(QString vlist MEMBER vlist NOTIFY vlistch)
...
public:
QString vlist;
...

public slots:
void change_vlist();
...
signals:
void vlistch();

..snip..

QQmlContext* ctx = engine->rootContext();

my_class fm;

ctx->setContextProperty("my_class_fm",&fm);

engine->load(QUrl("main.qml"));

..snip..(main.qml)

Button
{
...
onClicked:my_class_fm.change_vlist()
}

Text
{
text:my_class_fm.vlist // value can not automatically updated, why?

.....

@

when i changed the value of "vlist" into qml direcly, "text" property automatically updated.

But i changed vlist internally via called member function which change the value then "text" property

not updated automatically. i wonder why? is this a threading issue? is there another way to succeed?

Thanks

[t3685]

Did you emit your @vlistch()@ signal when doing the internal change?

[unixmania]

not. am i have to do it?

[unixmania]

yes .thanks.

[Rolias]

I must admit I'm not a big fan of the MEMBER decorator. You might be interested in my AUTO_PROPERTY macro. I wrote up my reasoning and links to the macro code in "this blog post":http://syncor.blogspot.com/2014/11/qt-auto-property.html. In addition to keeping your private implementation details private, it writes the notify signal for you.