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Opening dialog from E4 command/handler [message #1219427]

Tue, 03 December 2013 19:46

Joseph Gagnon

Messages: 68
Registered: June 2013

Member

I have developed a simple E4 application that is using JavaFX as the renderer. I am also using e(fx)clipse libraries to implement the dialogs. I have set up a command and handler in the .e4xmi file that I have attached to a menu. I would like to be able to trigger the opening of a dialog from one of those commands, but am not sure know how to do it.

I tried using injection to make the dialog available to the handler execute() method, but that did not work (didn't seem like the right way anyway). My next thought was to post some sort of event from the handler that another event handler could then intercept and react to. Does that make any sense or is there a better way?

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Re: Opening dialog from E4 command/handler [message #1219447 is a reply to message #1219427]

Tue, 03 December 2013 22:03

Thomas Schindl

Messages: 6651
Registered: July 2009

Senior Member

On 03.12.13 20:46, Joseph Gagnon wrote:
> I have developed a simple E4 application that is using JavaFX as the
> renderer. I am also using e(fx)clipse libraries to implement the
> dialogs. I have set up a command and handler in the .e4xmi file that I
> have attached to a menu. I would like to be able to trigger the opening
> of a dialog from one of those commands, but am not sure know how to do it.
>
> I tried using injection to make the dialog available to the handler
> execute() method, but that did not work (didn't seem like the right way

To make it available in the execute the dialog class needs to be
registered in the IEclipseContext.

> anyway). My next thought was to post some sort of event from the handler
> that another event handler could then intercept and react to. Does that
> make any sense or is there a better way?

Sort of, the other possibility is that you treat your PartImpl as the
Controller to your UI

public class MyPart {

@PostConstruct
void init(IEclipseContext ctx, ....) {
ctx.put(MyPart.class,this);
}

public void openDialog() {
// your dialog code
}
}

public class Handler {
void run(MyPart p) {
p.openDialog();
}
}

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Re: Opening dialog from E4 command/handler [message #1219539 is a reply to message #1219447]

Wed, 04 December 2013 14:03

Joseph Gagnon

Messages: 68
Registered: June 2013

Member

> To make it available in the execute the dialog class needs to be registered in the IEclipseContext.

How (and when and where) do I register the dialog? Does a dialog object need to be instantiated?

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Re: Opening dialog from E4 command/handler [message #1219579 is a reply to message #1219427]

Wed, 04 December 2013 17:58

Joseph Gagnon

Messages: 68
Registered: June 2013

Member

I guess what I'm really trying to understand is how to hook up E4 command handlers to do things in general, not just opening a dialog. Does the use of the application (or eclipse) context play an important role in this regard?

I need more examples I can look at where the underlying major players in eclipse 4 are used.

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Re: Opening dialog from E4 command/handler [message #1219714 is a reply to message #1219447]

Thu, 05 December 2013 14:31

Joseph Gagnon

Messages: 68
Registered: June 2013

Member

OK, I think maybe I understand. I guess this is a variation on injection.

Let me know if I have this right. In some application class, I provide a means to execute needed code (in this case, opening a dialog). I register that class with the eclipse context like the following:

public class MainPanePart {

  @Inject
  private MApplication application;

  @PostConstruct
  public void init(BorderPane parent) {
    application.getContext().set(MainPanePart.class, this);
    ...
  }

  public void openDialog() {
    ...
  }

  ...
}

Then, in my handler class I "inject" the class above as an argument to the execute() method and execute my class logic as follows:

public class SearchHandler {

  @Execute
  public void execute(MainPanePart part) {
    System.out.println("SearchHandler called");
    part.openDialog();
  }

}

I've tried this and it appears to work. Is this the gist of how E4 command handlers are "attached" to business logic to execute the desired functionality?

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Re: Opening dialog from E4 command/handler [message #1219854 is a reply to message #1219714]

Fri, 06 December 2013 09:56

Eclipse User

Yes

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