RE: [ve-dev] Accessing Selected object in VE

[Joe Winchester <WINCHEST@xxxxxxxxxx>]

Hi Rashmi,

The usual reason for the error you've
got is that you're trying to do something that accesses the SWT subsystem
and it isn't running on the display thread.  The way to usually code
around this is to do something like

public void widgetSelected(SelectionEvent
e){
  // This has to be in the Display
thread because it's an SWT callback
  Display.getCurrent().asyncExec(new
Runnable()){
    public void run(){
      // Do stuff here
    }
  }
}

The Display.asyncExec(Runnable) posts
the runnable to run asynchronously on the Display thread, and syncExec
does it synchronously.  Almost all of the time it's async exec you
want.  

The VE has a nice helper that called
EditPartRunnable that is useful because when you're doing stuff with edit
parts (like selecting them) there is the possibility that things get de-activated
between the time you post your request and it gets run, which will create
some kind of race condition exception.  The code for EditPartRunnable
is along the lines.

CDEUtilities.displayExec(getHost(),
"KEY ONLY I USE" , new
EditPartRunnable(getHost()) { //$NON-NLS-1$
  protected
void
doRun() {
    // Do stuff here
  }
});

The getHost() is the model object from
the edit part (the IJavaInstance), and the String "KEY ONLY I USE"
is just a unique identifier that means that if multiple requests are queued
for the same model object and the same key then only one is executed.  This
allows requests to be collapsed.

Best regards,

Joe Winchester

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Subject:        RE: [ve-dev] Accessing Selected object in VE


hi All,
  I have built a JTree(Swing )  to represent the uicomponent of Visual Editor using the EditParts retrived from TreeViewer of JavaVisualEditorPart .This tree is embedded in to a view.  On click of the tree node, I am retrieving the editpart stored in the tree node and trying to select the same on the JavaVisualEditorPart's TreeViewer. This event is raising the following exception.

org.eclipse.swt.SWTException: Invalid thread access
Can somebody help me in solving this?
Thanks and Regards
Rashmi H.Ramachandra

 

---

From: ve-dev-bounces@xxxxxxxxxxx
[mailto:ve-dev-bounces@xxxxxxxxxxx] On Behalf Of H Ramachandra,
Rashmi
Sent: Thursday, 29 December 2005 12:09 PM
To: Discussions people developing code for the Visual Editor project
Subject: RE: [ve-dev] Accessing Selected object in VE

Hi Srimanth,
    Thanks for the input. I was
able to assign a selection listener to the JavaVisualEditor. Its working
fine. I can display the kind of object that is being selected by doing
toString() to the selection object. Casting it to IJavaInstance provides
with further functionalities. But I am unable to get the edit domain for
the JavaVisualEditorPart as the required method ' getEditDomain()' does
not seem to exist.
I want to loop through all the components
from the root model to get to the component which i want it to be selected.
 
Can you please help me out.
 
Thank You and Regards
Rashmi H.Ramachandra

---

From: ve-dev-bounces@xxxxxxxxxxx
[mailto:ve-dev-bounces@xxxxxxxxxxx] On Behalf Of Srimanth Gunturi
Sent: Tuesday, 27 December 2005 10:54 PM
To: Discussions people developing code for the Visual Editor project
Subject: Re: [ve-dev] Accessing Selected object in VE


Hi Rashmi, 

> how do I get the selected component on the visual editor canvas?
If you can get the EditorPart (JavaVisualEditorPart), you can add a listener
to its site's page's selection provider - 
        getSite().getPage().addSelectionListener(new
ISelectionListener(){ 
                public void selectionChanged(IWorkbenchPart
part, ISelection selection) { 
                    
   System.out.println("Selection Changed!");
                }
        }); 

> How do I get access to the root model
'JavaVisualEditorPart.getEditDomain().getDiagramData()' will give you the
root model. You can cast it to the 'BeanSubclassComposition' class to access
the this type, the components etc. 
Or if you are coming from Codegen's model, 'IBeanDeclModel.getCompositionModel().getModelRoot()'
should give you the 'BeanSubclassComposition' also.

> and the IJAvaInstance of the selected object. 
When you get the GEF EditPart of the selected object as described above,
just do a 'getModel()' on the EditPart to get the IJavaInstance.

Regards, 
Sri.

"H Ramachandra, Rashmi" <rashmi.h.ramachandra@xxxxxxx>
Sent by: ve-dev-bounces@xxxxxxxxxxx

12/26/2005 11:40 PM

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Subject	[ve-dev] Accessing Selected object in VE

hi all, 
how do I get the selected component on the visual editor canvas?
How do I get access to the root model and the IJAvaInstance of the selected
object. 
I have tried to go through source code of 'org.eclipse.ve.internal.java.codegen.editorpart.BeansList'
and 'org.eclipse.ve.internal.java.codegen.editorpart.JavaVisualEditorPart'.
I am not able to find any entry point for accessing selected objects.

My requirement is to build a tree that partially replicates the JavaBean View to show both visual and non-visual components present in the java file in the form of a tree.Is there any API provided for developers to access the components in the visual editor. I have tried going through the current API and the source code available for tracking the JavaBean View components, but it has not been fruitful

Can anybody please help.
-rashmi _______________________________________________
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