How to explicitly access the Connector from Widget Side into Vaadin 7? - vaadin

Question

I create a Widget with his Server Side Class and the Client Side (Connector Class, ServerRPC Class, State Class and Widget Class).
Connector :
#Connect(Custom.class)
public class CustomConnector extends ButtonConnector {
...
public void myFunc() {
// DO Something
}
}
Widget :
public class CustomWidget extends VButton {
...
private CustomConnector conn = new CustomConnector();
public CustomWidget () {
conn.myFunc();
}
...
}
Now from the Widget Class i want to explicitly call/access the Connector Object, which are not a Singleton, so that i can access a function too. How can i solve it?

Answer 1

In my opinion you should not access connector directly from GWT widget. It is against Vaadin 7 architecture where GWT widgets are objects independent from vaadin at all.
However if we are talking about dirty migration from Vaadin 6 to 7 solution could be:
ComponentConnector connector = ConnectorMap.get(client).getConnector(CustomWidget.this); // client is taken from updateFromUIDL method (Vaadin6)
Better solution will be to add "state" listener to the widget
public interface CustomWidgetStateListener {
public void stateChanged();
}
public class CustomWidget extends VButton {
...
CustomWidgetStateListener listener;
public void addStateListener(CustomWidgetStateListener listener) {
this.listener = listener;
}
public void notifyStateChanged() { // You can call notifyStateChanged() whenever you want to notify connector
listener.stateChanged();
}
...
}
public class CustomConnector extends ButtonConnector {
public CustomConnector() {
getWidget().addStateListener(new CustomWidgetStateListener() {
public void stateChanged() {
myFunc();
}
});
}
...
public void myFunc() {
// DO Something
}
}