| Lost in a maze. [message #499762] |
Mon, 23 November 2009 20:23  |
Eclipse User |
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Hi,
sorry to pester You all again.
I am trying to write my first "real" RCP app and I'm more than a bit lost.
I found a lot of good tutorials around (I'm especially fond of Lars Vogella's ones), but I still do not understand how to find my way around.
Current example:
I have an app that processes an XML data file.
I have two views (ViewPart) that relay on it.
The first one (Book) actually owns the XML (in a org.w3c.DOM.Document) and displays the Book structure in a TreeView widget.
This TreeView is also a SelectionProvider.
The second view (Scene) is a ISelectionListener displays the details of the selected part of the book by hooking to The first one events.
The ISelection transports a node reference in the XML tree and I can retrieve all Information I need.
Up to this point the things are relatively clear and clean.
Scene uses what I believe is a correct way to hook to the selection: getSite().getPage().addSelectionListener(Book.ID, this);
After this things simply fall apart:
I have a Command defined to Open a file.
The Command has a handler public class OpenHandler extends AbstractHandler
The nearest thing to a working code I have is: IWorkbenchWindow ww = HandlerUtil.getActiveWorkbenchWindow(event);
IWorkbench w = ww.getWorkbench();
IWorkbenchPart wp = w.get
if (wp instanceof Book) {
Book b = (Book) wp;
b.setFile(file);
}
I also tried doing the reverse: Have the OpenHandler completely handle the file operations, but I didn't find a way to reach the handler from the View: I tried something like: ICommandService cs = (ICommandService)getSite().getPage().getWorkbenchWindow().getService(ICommandService.class);
Command cmd = cs.getCommand(OpenHandler.ID);
cmd.addCommandListener(this);
IHandler ih = cmd.getHandler();
AbstractHandler ah = (AbstractHandler)ih;
OpenHandler oh = (OpenHandler)ah;
oh.getFile();
Similar problems I have in Scene to retrieve the name of the input file from Book.
I currently solved the problem in a very ugly way: since I have a single instance of the Book View I declared a static member holding the reference to the singleton and I retrieve from there the instance I need.
I strongly suspect there are better methods.
Can someone point me in the right direction?
I do apologize for the length of the post, but I wanted to make clear where I'm lost.
Thanks in Advance
Mauro
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| Re: Lost in a maze. [message #499918 is a reply to message #499762] |
Tue, 24 November 2009 09:21  |
| Eclipse User |
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| Mauro Condarelli wrote on Mon, 23 November 2009 20:23 |
Up to this point the things are relatively clear and clean.
Scene uses what I believe is a correct way to hook to the selection: getSite().getPage().addSelectionListener(Book.ID, this);
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It would be better to use:
ISelectionService s = getSite().getService(ISelectionService.class);
s.addSelectionListener(Book.ID, this);
This has the advantage that when your part is disposed, you don't have to worry about removing the selection listener (it gets cleaned up automatically).
| Quote: |
IWorkbenchWindow ww = HandlerUtil.getActiveWorkbenchWindow(event);
IWorkbench w = ww.getWorkbench();
IWorkbenchPart wp = w.get
if (wp instanceof Book) {
Book b = (Book) wp;
b.setFile(file);
}
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from the workbench window, I would go:
IWorkbenchPage page = ww.getActivePage();
Book part = (Book)page.findView(Book.ID);
You can put safeguards around that code, but basically look for your part by ID (or part reference, although in an RCP app that might not be as important).
PW
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