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Binding: List (want first Element) in Feature Path [message #791988]

Mon, 06 February 2012 08:46

Eclipse User

Hi,
I have a binding problem.

If have a train which has a list of routes of which everyone has a list of stations.

Now I want to bind a TextInput to the last station of the first route.

A Feature path does not accept lists in its middle...can anyone tell me how to do this... it would be nice if the textinput recognizes if the last station is deleted and that it has to take te station before (which now ist the last one) or if the first routes gets deleted and the second one will takes its place.

Greetings from Germany

Re: Binding: List (want first Element) in Feature Path [message #792718 is a reply to message #791988]

Tue, 07 February 2012 05:24

Eclipse User

Nobody knows ?

Re: Binding: List (want first Element) in Feature Path [message #792770 is a reply to message #792718]

Tue, 07 February 2012 06:45

Eclipse User

Markus,

I generally rely on Tom Schindl to answer data binding questions... I'm
pretty sure there's no way using feature paths to do what you're asking...

On 07/02/2012 11:24 AM, Markus Jo wrote:
> Nobody knows ?

Re: Binding: List (want first Element) in Feature Path [message #792803 is a reply to message #792770]

Tue, 07 February 2012 07:31

Eclipse User

Here I am. It's been on my morning newsgroup answer task list but had to
be deferred to my lunch answer list :-)

Do I get the problem here right:

MyRootObject {
MyChildObject[] children;
}

MyChildObject {
String name;
}

You now have MyRootObject-Instance like this:

MyRootObject {
children = [
MyChildObject("A"),
MyChildObject("B"),
MyChildObject("C")
]
}

We now want the text-field to contain "C". You can't do that with
feature-paths but with the low-level API it is doable since 2.7.

---------------------8<---------------------
Text t = ...

EMFDatabinding dbc = ...

MyRootObject rootInstance = ...;
IEMFListProperty lProp = EMFProperties.list(MY_ROOT_OBJECT__CHILDREN);
IEMFValueProperty vProp = lProp.value(new ListElementAccess<Object>()
{

public int getReadValueIndex(List<Object> list)
{
return list.size() - 1;
}

@Override
public int getWriteValueIndex(List<Object> list)
{
return WriteData.NO_INDEX;
}
});

IEMFValueProperty detailValue = vProp.value(MY_CHILDOBJECT__NAME);

dbc.bindValue(
WidgetProperties.text(SWT.Modify).observe(t),
detailValue.observe(rootInstance)
);

---------------------8<---------------------

IIRC there's a bug filed as
https://bugs.eclipse.org/bugs/show_bug.cgi?id=354016 but I think you
should not get burned by it.

Let's hope i can find the time to work on the EMF-Databinding stuff a
bit more.

Tom

Am 07.02.12 12:45, schrieb Ed Merks:
> Markus,
>
> I generally rely on Tom Schindl to answer data binding questions... I'm
> pretty sure there's no way using feature paths to do what you're asking...
>
> On 07/02/2012 11:24 AM, Markus Jo wrote:
>> Nobody knows ?

Re: Binding: List (want first Element) in Feature Path [message #792857 is a reply to message #792803]

Tue, 07 February 2012 08:57

Eclipse User

Tom, you´re the man. Tested it for the Model you exampled and it works.

For my project I need it with two inner lists ... RootObject -> OuterChildren(0) -> MiddleObject -> ChildsChildren(list.size()-1).

I will test the harder version tomorrow.... I hope I get it on my own....if not I will start crying here again Smile

Thank you

Re: Binding: List (want first Element) in Feature Path [message #793498 is a reply to message #792857]

Wed, 08 February 2012 03:00

Eclipse User

Ok, need help.....this combination.... RootObject -> OuterChildren(0) -> MiddleObject -> ChildsChildren(list.size()-1).

OuterChildren is a list, Middleobject a single object and ChildsChildren is a list again.

I want to bind the 'name' attribute of the last element in the ChildsChildren-List of the MiddleObject of the first element in the RootObjects OuterChildren list to a textfield.

Is this possible with two lists in path. The upper example of Tom seems not to work for nested lists.

Re: Binding: List (want first Element) in Feature Path [message #793540 is a reply to message #793498]

Wed, 08 February 2012 04:09

Eclipse User

I guess you need to provide me a test case. You can use the model we
have in our test suite [1] as a start and extend it to add your use case.

I can then take a look where it fails.

Tom

[1]http://git.eclipse.org/c/emf/org.eclipse.emf.git/tree/tests/org.eclipse.emf.test.databinding

Am 08.02.12 09:00, schrieb Markus Jo:
> Ok, need help.....this combination.... RootObject -> OuterChildren(0) ->
> MiddleObject -> ChildsChildren(list.size()-1).
>
> OuterChildren is a list, Middleobject a single object and ChildsChildren
> is a list again.
>
> I want to bind the 'name' attribute of the last element in the
> ChildsChildren-List of the MiddleObject of the first element in the
> RootObjects OuterChildren list to a textfield.
>
> Is this possible with two lists in path. The upper example of Tom seems
> not to work for nested lists.

Re: Binding: List (want first Element) in Feature Path [message #798104 is a reply to message #793540]

Tue, 14 February 2012 04:01

Eclipse User

Hi, what do you mean.

I should download the whole Project and change it ? This would be too much work...I would need days and I even dont know how to download it with GIT.

Or do you just want a ecore file ?

Is this really to complex to understand... I want to bind the 'name' Attribute of the Inner Child with this path ....'RootObject -> OuterChildren(0) -> MiddleObject -> InnerChildren(list.size()-1) -> InnerChild.name' .... to a Text Field.

[Updated on: Tue, 14 February 2012 04:13] by Moderator

Re: Binding: List (want first Element) in Feature Path [message #798120 is a reply to message #798104]

Tue, 14 February 2012 04:21

Eclipse User

I want a simple test-case from you, ideally you should adjust the .ecore
found in the git-repo but any other easy and small .ecore + Java-Code is
sufficient as well.

Your problem is not really complex to understand and if you want me to
spend *my time* to fix a problem you are having - you seem to forget
that you get here support for free (even bugfixes) and your attitude
shown in the paragraph below is not really a motivation to spend their
time on your problem.

If you contract one of me I'm happy doing the job I ask you for - sorry
if this sounds arrogant and not listing to our users problem but as said
it's my spare time.

Tom

Am 14.02.12 10:01, schrieb Markus Jo:
> Hi, what do you mean.
>
> I should download the whole Project and change it ? This would be too
> much work...I would need days and I even dont know how to download it
> with GIT.
>
> Or do you just want a ecore file ?
>
> Is this really to complex to understand... I want to bind the name
> Attribute of the Inner Child with this path RootObject ->
> OuterChildren(0) -> MiddleObject -> InnerChildren(list.size()-1) ->
> InnerChild.name to a Text Field.

Re: Binding: List (want first Element) in Feature Path [message #798176 is a reply to message #798120]

Tue, 14 February 2012 05:52

Eclipse User

When I copy the Code of the sample ecore I found behind your link in a file called EMFDB.ecore and try to open it with the Eclipse ecore-Editor I get:

java.lang.ClassCastException: org.eclipse.ui.part.FileEditorInput cannot be cast to org.eclipse.emf.cdo.dawn.ui.DawnEditorInput

Any idea whats the problem....I am at work and have a PC without rights to install anything....so using GIT is no option...but copy paste of the ecore model-files content (I am wondering that this are so less lines of code) should work, doesnt it ?

Re: Binding: List (want first Element) in Feature Path [message #798181 is a reply to message #798176]

Tue, 14 February 2012 05:58

Eclipse User

Another Question.....you understood my problem but you do not know if it can be solved my emf-binding ? You want to try it yourself ?

Re: Binding: List (want first Element) in Feature Path [message #798184 is a reply to message #798176]

Tue, 14 February 2012 06:00

Eclipse User

I have no idea why the Dawn-Editor tries to open the file - if you have
no git - the file has not been modified since we moved aways from CVS
and the because the CVS-Client is part of your Eclipse Install you can
check out the project from the CVS-Repo.

The repo is at pserver:anonymous@dev.eclipse.org:/cvsroot/modeling

Tom

Am 14.02.12 11:52, schrieb Markus Jo:
> When I copy the Code of the sample ecore I found behind your link in a
> file called EMFDB.ecore and try to open it with the Eclipse ecore-Editor
> I get:
>
> java.lang.ClassCastException: org.eclipse.ui.part.FileEditorInput cannot
> be cast to org.eclipse.emf.cdo.dawn.ui.DawnEditorInput
>
> Any idea whats the problem....I am at work and have a PC without rights
> to install anything....so using GIT is no option...but copy paste of the
> ecore model-files content (I am wondering that this are so less lines of
> code) should work, doesnt it ?

Re: Binding: List (want first Element) in Feature Path [message #798205 is a reply to message #798184]

Tue, 14 February 2012 06:31

Eclipse User

Ok, I modified the ecore.

Back to the problem. The hard Version consists of a Master-Detail-View.

At the DetailsPage I have a swt.Text and I need that it is bound to A.getBList(0).getD().getEList(list.size-1).name.

Accordingly to the name of the last element in the eList of the D of the first B in As bList.

In the MasterView is a List of A´s ... so the selected A would be the root for the binding.

I hoped it would work that way (by nesting lProp.value(new ListElementAccess()):


IEMFListProperty lProp1 = EMFProperties.list(EmfdbPackage.Literals.A__BLIST);
IEMFValueProperty vProp1 = lProp1.value(new ListElementAccess<Object>()	{

            public int getReadValueIndex(List<Object> list)
            {
                return 0;
            }

            @Override
            public int getWriteValueIndex(List<Object> list)
            {
                return WriteData.NO_INDEX;
            }
        });


FeaturePath featurePath = FeaturePath.fromList(
				EmfdbPackage.Literals.B__D,
				EmfdbPackage.Literals.D__ELIST);

IEMFListProperty lProp2 = vProp1.list(featurePath);
IEMFValueProperty vProp2 = lProp2.value(new ListElementAccess<Object>()	{

            public int getReadValueIndex(List<Object> list)
            {
                return list.size() - 1;
            }

            @Override
            public int getWriteValueIndex(List<Object> list)
            {
                return WriteData.NO_INDEX;
            }
        });

IEMFValueProperty detailValue = vProp2.value(EmfdbPackage.Literals.E__NAME);
IObservableValue modelObsevable = detailValue.observeDetail(masterTreeViewerObservable);

bindingContext.bindValue(nameTextObsevable, modelObsevable);

Unfortunately vProp1.list() accepts no FeaturePath. Could it work by nesting all the elements of the FeaturePath by using SingleVlaue-Properties ?

Is this MasterDetails/List/List Binding possible ?

Do you need more info ?

Attachment: EMFDB.ecore
(Size: 1.83KB, Downloaded 155 times)

[Updated on: Tue, 14 February 2012 06:34] by Moderator

Re: Binding: List (want first Element) in Feature Path [message #798209 is a reply to message #798181]

Tue, 14 February 2012 06:35

Eclipse User

I think I understood it yes and I would try it myself but you need to
provide me a self contained example - i want:

a) an ecore (ideally a modified EMFDB.ecore)
b) a java-file which is runnable or even better a JUnit-Test but a
runnable file is enough

Tom

Am 14.02.12 11:58, schrieb Markus Jo:
> Another Question.....you understood my problem but you do not know if it
> can be solved my emf-binding ? You want to try it yourself ?

Re: Binding: List (want first Element) in Feature Path [message #798214 is a reply to message #798205]

Tue, 14 February 2012 06:37

Eclipse User

Ok - now we have an .ecore - next I need is a runnable Java-Class with
the code you pasted below to reproduce the problem. In your case
probably a Shell with a Text-Widget, .... .

Tom

Am 14.02.12 12:31, schrieb Markus Jo:
> Ok, I modified the ecore.
>
>
> Back to the problem. The hard Version consists of a Master-Detail-View.
>
> At the DetailsPage I have a swt.Text and I need that it is bound to A.getBList(0).getD().getEList(list.size-1).name.
>
> Accordingly to the name of the last element in the eList of the D of the first B in As bList.
>
>
> I hoped it would work that way (by nesting lProp.value(new ListElementAccess()):
>
>
>
> IEMFListProperty lProp1 = EMFProperties.list(EmfdbPackage.Literals.A__BLIST);
> IEMFValueProperty vProp1 = lProp1.value(new ListElementAccess<Object>() {
>
> public int getReadValueIndex(List<Object> list)
> {
> return 0;
> }
>
> @Override
> public int getWriteValueIndex(List<Object> list)
> {
> return WriteData.NO_INDEX;
> }
> });
>
>
> FeaturePath featurePath = FeaturePath.fromList(
> EmfdbPackage.Literals.B__D,
> EmfdbPackage.Literals.D__ELIST);
>
> IEMFListProperty lProp2 = vProp1.list(featurePath);
> IEMFValueProperty vProp2 = lProp2.value(new ListElementAccess<Object>() {
>
> public int getReadValueIndex(List<Object> list)
> {
> return list.size() - 1;
> }
>
> @Override
> public int getWriteValueIndex(List<Object> list)
> {
> return WriteData.NO_INDEX;
> }
> });
>
> IEMFValueProperty detailValue = vProp2.value(EmfdbPackage.Literals.E__NAME);
> IObservableValue modelObsevable = detailValue.observeDetail(masterTreeViewerObservable);
>
> bindingContext.bindValue(nameTextObsevable, modelObsevable);
>
>
> Unfortunately vProp1.list() accepts no FeaturePath. Could it work by nesting all the elements of the FeaturePath by using SingleVlaue-Properties ?
>
> Is this MasterDetails/List/List Binding possible ?
>
> Do you need more info ?

Re: Binding: List (want first Element) in Feature Path [message #798248 is a reply to message #798214]

Tue, 14 February 2012 07:31

Eclipse User

Ok, I have done it.....puh.

Here is the shell......

Create a PluginProject in Eclipse and add these are the required plugins to the mainfest.mf.

Require-Bundle: 
 org.eclipse.core.runtime,
 org.eclipse.emf.ecore.xmi;visibility:=reexport,
 org.eclipse.emf.edit.ui;visibility:=reexport,
 org.eclipse.emf.transaction;bundle-version="1.4.0",
 org.eclipse.ui.forms;bundle-version="3.5.2",
 org.eclipse.core.databinding;bundle-version="1.3.100",
 org.eclipse.core.databinding.beans;bundle-version="1.2.100",
 org.eclipse.core.databinding.observable;bundle-version="1.3.0",
 org.eclipse.core.databinding.property;bundle-version="1.3.0",
 org.eclipse.jface.databinding;bundle-version="1.4.0",
 org.eclipse.emf.databinding;bundle-version="1.2.0",
 org.eclipse.emf.compare;bundle-version="1.1.2",
 org.eclipse.emf.databinding.edit;bundle-version="1.2.0"

Then it should work. You should see a shell with a TreeViewer (only one layer is displayed) and the textfield to bind to its right.

Changing the TreeViewerSelection should change the text.

The binding (bind1()), that is used, works.....but only for a.getBList(size-1).getString and not for a.getbList(0).getD().getEList(size-1).getName.....this should be done by the bind2() method which you should update with some magic.

Thx for your patience

Attachment: TestShell.java
(Size: 7.63KB, Downloaded 296 times)

Re: Binding: List (want first Element) in Feature Path [message #798290 is a reply to message #798248]

Tue, 14 February 2012 08:46

Eclipse User

The low-level API can't use a FeaturePath you need to navigate through
the properties manually but even then you'll be hit by [1].

Once the next built is published it will work. Here's the method from
the Unit-Test as a reference on how to use the API.

> public void _test_sublistElement()
> {
> A a = (A)resource.getContents().get(0);
> IEMFListProperty lProp1 = EMFProperties.list(EmfdbPackage.Literals.A__BLIST);
> IEMFValueProperty vProp1 = lProp1.value(new ListElementAccess<Object>()
> {
>
> public int getReadValueIndex(List<Object> list)
> {
> return 0;
> }
>
> @Override
> public int getWriteValueIndex(List<Object> list)
> {
> return WriteData.NO_INDEX;
> }
> });
>
> IEMFValueProperty vProp2 = vProp1.value(EmfdbPackage.Literals.B__D);
> IEMFListProperty lProp2 = vProp2.list(EmfdbPackage.Literals.D__ELIST);
>
> IEMFValueProperty vProp3 = lProp2.value(new ListElementAccess<Object>()
> {
>
> public int getReadValueIndex(List<Object> list)
> {
> return list.size() - 1;
> }
>
> @Override
> public int getWriteValueIndex(List<Object> list)
> {
> return WriteData.NO_INDEX;
> }
> });
>
>
> IEMFValueProperty detailValue = vProp3.value(EmfdbPackage.Literals.E__NAME);
> IObservableValue v = detailValue.observe(a);
> assertEquals(v.getValue(), "Last Element");
> }

Tom

[1]https://bugs.eclipse.org/bugs/show_bug.cgi?id=354016

Am 14.02.12 13:31, schrieb Markus Jo:
> Ok, I have done it.....puh.
>
> Here is the shell......
>
> Create a PluginProject in Eclipse and add these are the required plugins to the mainfest.mf.
>
>
> Require-Bundle:
> org.eclipse.core.runtime,
> org.eclipse.emf.ecore.xmi;visibility:=reexport,
> org.eclipse.emf.edit.ui;visibility:=reexport,
> org.eclipse.emf.transaction;bundle-version="1.4.0",
> org.eclipse.ui.forms;bundle-version="3.5.2",
> org.eclipse.core.databinding;bundle-version="1.3.100",
> org.eclipse.core.databinding.beans;bundle-version="1.2.100",
> org.eclipse.core.databinding.observable;bundle-version="1.3.0",
> org.eclipse.core.databinding.property;bundle-version="1.3.0",
> org.eclipse.jface.databinding;bundle-version="1.4.0",
> org.eclipse.emf.databinding;bundle-version="1.2.0",
> org.eclipse.emf.compare;bundle-version="1.1.2",
> org.eclipse.emf.databinding.edit;bundle-version="1.2.0"
>
>
>
>
>
> Then it should work. You should see a shell with a TreeViewer (only one layer is displayed) and the textfield to bind to its right.
>
> Changing the TreeViewerSelection should change the text.
>
> The binding (bind1()), that is used, works.....but only for a.getBList(size-1).getString and not for a.getbList(0).getD().getEList(size-1).getName.....this should be done by the bind2() method which you should update with some magic.
>
> Thx for your patience

Re: Binding: List (want first Element) in Feature Path [message #798904 is a reply to message #798290]

Wed, 15 February 2012 03:04

Eclipse User

Hmm.....I thought I have already tried your workaround and it did not work too....by I tried again in our TestShell.

The workaround does not consider the Master-Detail construction.....so I tried first, to realize it ignoring the treeViewer and bind the TextInput to the first element in the dummy list with following exception:

Exception in thread "main" java.lang.NullPointerException
	at test.TestShell$4.getReadValueIndex(TestShell.java:169)
	at org.eclipse.emf.databinding.internal.EMFListValueProperty.doGetValue(EMFListValueProperty.java:54)
	at org.eclipse.core.databinding.property.value.ValueProperty.getValue(ValueProperty.java:57)
	at org.eclipse.core.internal.databinding.property.value.SimplePropertyObservableValue.doGetValue(SimplePropertyObservableValue.java:98)
	at org.eclipse.core.databinding.observable.value.AbstractObservableValue.getValue(AbstractObservableValue.java:76)
	at org.eclipse.core.databinding.observable.value.DecoratingObservableValue.getValue(DecoratingObservableValue.java:98)
	at org.eclipse.core.internal.databinding.observable.masterdetail.DetailObservableValue.updateInnerObservableValue(DetailObservableValue.java:101)
	at org.eclipse.core.internal.databinding.observable.masterdetail.DetailObservableValue.<init>(DetailObservableValue.java:78)
	at org.eclipse.core.databinding.observable.masterdetail.MasterDetailObservables.detailValue(MasterDetailObservables.java:56)
	at org.eclipse.core.databinding.property.value.ValueProperty.observeDetail(ValueProperty.java:127)
	at org.eclipse.emf.databinding.internal.EMFValuePropertyDecorator.observeDetail(EMFValuePropertyDecorator.java:137)
	at org.eclipse.core.internal.databinding.property.ValuePropertyDetailValue.observe(ValuePropertyDetailValue.java:68)
	at org.eclipse.emf.databinding.internal.EMFValuePropertyDecorator.observe(EMFValuePropertyDecorator.java:119)
	at test.TestShell.bind(TestShell.java:179)
	at test.TestShell.main(TestShell.java:109)

The List given to the getReadValueIndex is null....but if I debug the datamodel-structure it is not.

Have you tried it in my testShell ? Here is the updated shell...do you see my failure ? I think there might be another Bug.

Attachment: TestShell.java
(Size: 6.51KB, Downloaded 232 times)

Re: Binding: List (want first Element) in Feature Path [message #798948 is a reply to message #798904]

Wed, 15 February 2012 04:00

Eclipse User

In my workspace with the patch it works like a charme and fails with the
same NPE without it => the patch fixing your problems.

If you grab the next build things will work as desired. I also tested
master-detail stuff and it also works without any problems and attached
you the modified test case.

Tom

Am 15.02.12 09:04, schrieb Markus Jo:
> Hmm.....I thought I have already tried your workaround and it did not work too....by I tried again in our TestShell.
>
> The workaround does not consider the Master-Detail construction.....so I tried first, to realize it ignoring the treeViewer and bind the TextInput to the first element in the dummy list with following exception:
>
>
> Exception in thread "main" java.lang.NullPointerException
> at test.TestShell$4.getReadValueIndex(TestShell.java:169)
> at org.eclipse.emf.databinding.internal.EMFListValueProperty.doGetValue(EMFListValueProperty.java:54)
> at org.eclipse.core.databinding.property.value.ValueProperty.getValue(ValueProperty.java:57)
> at org.eclipse.core.internal.databinding.property.value.SimplePropertyObservableValue.doGetValue(SimplePropertyObservableValue.java:98)
> at org.eclipse.core.databinding.observable.value.AbstractObservableValue.getValue(AbstractObservableValue.java:76)
> at org.eclipse.core.databinding.observable.value.DecoratingObservableValue.getValue(DecoratingObservableValue.java:98)
> at org.eclipse.core.internal.databinding.observable.masterdetail.DetailObservableValue.updateInnerObservableValue(DetailObservableValue.java:101)
> at org.eclipse.core.internal.databinding.observable.masterdetail.DetailObservableValue.<init>(DetailObservableValue.java:78)
> at org.eclipse.core.databinding.observable.masterdetail.MasterDetailObservables.detailValue(MasterDetailObservables.java:56)
> at org.eclipse.core.databinding.property.value.ValueProperty.observeDetail(ValueProperty.java:127)
> at org.eclipse.emf.databinding.internal.EMFValuePropertyDecorator.observeDetail(EMFValuePropertyDecorator.java:137)
> at org.eclipse.core.internal.databinding.property.ValuePropertyDetailValue.observe(ValuePropertyDetailValue.java:68)
> at org.eclipse.emf.databinding.internal.EMFValuePropertyDecorator.observe(EMFValuePropertyDecorator.java:119)
> at test.TestShell.bind(TestShell.java:179)
> at test.TestShell.main(TestShell.java:109)
>
>
>
> The List given to the getReadValueIndex is null....but if I debug the datamodel-structure it is not.
>
> Have you tried it in my testShell ? Here is the updated shell...do you see my failure ? I think there might be another Bug.

package test;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import org.eclipse.core.databinding.observable.Realm;
import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.core.databinding.observable.value.IValueChangeListener;
import org.eclipse.core.databinding.observable.value.ValueChangeEvent;

import org.eclipse.emf.databinding.EMFDataBindingContext;
import org.eclipse.emf.databinding.EMFProperties;
import org.eclipse.emf.databinding.IEMFListProperty;
import org.eclipse.emf.databinding.IEMFListProperty.ListElementAccess;
import org.eclipse.emf.databinding.IEMFValueProperty;
import org.eclipse.emf.test.databinding.emfdb.A;
import org.eclipse.emf.test.databinding.emfdb.B;
import org.eclipse.emf.test.databinding.emfdb.D;
import org.eclipse.emf.test.databinding.emfdb.E;
import org.eclipse.emf.test.databinding.emfdb.EmfdbFactory;
import org.eclipse.emf.test.databinding.emfdb.EmfdbPackage;

import org.eclipse.jface.databinding.swt.ISWTObservableValue;
import org.eclipse.jface.databinding.swt.SWTObservables;
import org.eclipse.jface.databinding.swt.WidgetProperties;
import org.eclipse.jface.databinding.viewers.IViewerObservableValue;
import org.eclipse.jface.databinding.viewers.ViewersObservables;
import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.jface.viewers.ILabelProviderListener;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Monitor;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

public class TestShell
{

private static Text text;
private static EMFDataBindingContext bindingContext;
private static TreeViewer tv;
private static IViewerObservableValue treeViewerObservable;

public static void main(String[] args)
{
final Display display = new Display();
Realm.runWithDefault(SWTObservables.getRealm(display), new Runnable()
{

@Override
public void run()
{
runMe(display);
}
});
}

private static void runMe(Display display)
{
Shell shell = new Shell(display);
shell.setSize(200, 200);
Monitor primary = display.getPrimaryMonitor();
Rectangle bounds = primary.getBounds();
Rectangle rect = shell.getBounds();
int x = bounds.x + (bounds.width - rect.width) / 2;
int y = bounds.y + (bounds.height - rect.height) / 2;
shell.setLocation(x, y);

shell.setLayout(new GridLayout(2, false));

tv = new TreeViewer(shell);
tv.getTree().setLayoutData(new GridData(GridData.FILL_BOTH));
tv.setContentProvider(new ITreeContentProvider()
{

@Override
public void dispose()
{
}

@Override
public void inputChanged(Viewer viewer, Object oldInput, Object newInput)
{
}

@Override
public Object[] getElements(Object inputElement)
{
return (Object[])inputElement;
}

@Override
public Object[] getChildren(Object parentElement)
{
return null;
}

@Override
public Object getParent(Object element)
{
return null;
}

@Override
public boolean hasChildren(Object element)
{
return false;
}

});
tv.setLabelProvider(new TestShell().new LabelProvider());
tv.setInput(createDummyInput());
treeViewerObservable = ViewersObservables.observeSingleSelection(tv);
text = new Text(shell, SWT.NONE);
text.setLayoutData(new GridData(200,SWT.DEFAULT));

// Binding Call
bind();
// Binding Call

shell.pack();
shell.open();
while (!shell.isDisposed())
{
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}

public static void bind()
{

ISWTObservableValue textObservable = WidgetProperties.text(SWT.Modify).observeDelayed(400, text);

A a = (A)((Object[])tv.getInput())[0];

IEMFListProperty lProp1 = EMFProperties.list(EmfdbPackage.Literals.A__BLIST);
IEMFValueProperty vProp1 = lProp1.value(new ListElementAccess<Object>()
{

public int getReadValueIndex(List<Object> list)
{
return 0;
}

@Override
public int getWriteValueIndex(List<Object> list)
{
return WriteData.NO_INDEX;
}
});

IEMFValueProperty vProp2 = vProp1.value(EmfdbPackage.Literals.B__D);
IEMFListProperty lProp2 = vProp2.list(EmfdbPackage.Literals.D__ELIST);

IEMFValueProperty vProp3 = lProp2.value(new ListElementAccess<Object>()
{

public int getReadValueIndex(List<Object> list)
{
return list.size() - 1;
}

@Override
public int getWriteValueIndex(List<Object> list)
{
return WriteData.NO_INDEX;
}
});
IEMFValueProperty detailValue = vProp3.value(EmfdbPackage.Literals.E__NAME);
// IObservableValue v = detailValue.observe(a);
IObservableValue v = detailValue.observeDetail(treeViewerObservable);

bindingContext = new EMFDataBindingContext();
bindingContext.bindValue(textObservable, v);
}

private static Object createDummyInput()
{
List<A> alist = new ArrayList<A>();
A a1 = EmfdbFactory.eINSTANCE.createA();
a1.getBlist().addAll(createBList(false));
A a2 = EmfdbFactory.eINSTANCE.createA();
a2.getBlist().addAll(createBList(true));

alist.add(a1);
alist.add(a2);

return alist.toArray();
}

private static Collection< ? extends B> createBList(boolean b)
{
List<B> blist = new ArrayList<B>();
B b1 = EmfdbFactory.eINSTANCE.createB();
b1.setD(createD());
B b2 = EmfdbFactory.eINSTANCE.createB();
b2.setD(createD());

if (b)
{
b1.setString("wrong value2");
b2.setString("right value2");
}
else
{
b1.setString("wrong value1");
b2.setString("right value1");
}

blist.add(b1);
blist.add(b2);
return blist;
}

private static D createD()
{
D d = EmfdbFactory.eINSTANCE.createD();
d.getElist().addAll(creatEList());
return d;
}

private static int count = 0;

private static Collection< ? extends E> creatEList()
{
List<E> elist = new ArrayList<E>();
E e1 = EmfdbFactory.eINSTANCE.createE();
e1.setName("wrong value");
E e2 = EmfdbFactory.eINSTANCE.createE();
e2.setName("right value: " + ++count);

elist.add(e1);
elist.add(e2);
return elist;
}

class LabelProvider implements ILabelProvider
{

@Override
public void addListener(ILabelProviderListener listener)
{
// do nothing
}

@Override
public void dispose()
{
// do nothing
}

@Override
public boolean isLabelProperty(Object element, String property)
{
return false;
}

@Override
public void removeListener(ILabelProviderListener listener)
{
// do nothing
}

@Override
public Image getImage(Object element)
{
return null;
}

@Override
public String getText(Object element)
{
return element.toString();
}
}

}

Attachment: TestShell.java
(Size: 7.62KB, Downloaded 225 times)

Re: Binding: List (want first Element) in Feature Path [message #798964 is a reply to message #798948]

Wed, 15 February 2012 04:25

Eclipse User

Ok, that would be nice....so the path can be found here ? https://bugs.eclipse.org/bugs/show_bug.cgi?id=354016

Is it this 3.3kb File ? The "+" and "-" at the start of the lines seem to be change informations. Now how do I get the changes to my Eclipse ? Or is there a new EMF Version I can download from somewhere ?

Re: Binding: List (want first Element) in Feature Path [message #798972 is a reply to message #798964]

Wed, 15 February 2012 04:40

Eclipse User

No the attached patch is not the correct one!

To get it in your workspace you have 3 options:
a) wait for a new emf build
b) import the emf-databinding sources (emf.databinding and
emf.databinding.edit) and apply the following patches:

Mandatory:
==========
http://git.eclipse.org/c/emf/org.eclipse.emf.git/commit/?id=d248dbac47b4dc3e5cbeef790aab9080f39348ae
http://git.eclipse.org/c/emf/org.eclipse.emf.git/commit/?id=f1f31f988335b9e4ea431ac94b8565a63c48c495
http://git.eclipse.org/c/emf/org.eclipse.emf.git/commit/?id=c5152a44a0f14764b3180c2567270170f3670fb1

Optional one but brings some performance into the game:
=======================================================
http://git.eclipse.org/c/emf/org.eclipse.emf.git/commit/?id=8359628c6f8312eba85a2044884626c045b51378

c) Clone the git-repo and import emf.databinding and emf.databinding.edit

a) would mean that up-grade your whole EMF (which should not be a
problem because it is fully backward compatible)

b) is some work and hard to maintain

c) easiest if you can someone get you to install egit into your eclipse
workspace and keep up with databinding changes

Tom

Am 15.02.12 10:25, schrieb Markus Jo:
> Ok, that would be nice....so the path can be found here ?
> https://bugs.eclipse.org/bugs/show_bug.cgi?id=354016
>
> Is it this 3.3kb File ? The "+" and "-" at the start of the lines seem
> to be change informations. Now how do I get the changes to my Eclipse ?
> Or is there a new EMF Version I can download from somewhere ?

Re: Binding: List (want first Element) in Feature Path [message #798997 is a reply to message #798972]

Wed, 15 February 2012 05:11

Eclipse User

I am falling into despair...

Option b)

I am to dump!

The patching does not work....when I used your attached Patch I get compile errors because the constructor EMFListValueProperty(eStructuralFeature, elementAccess); is not there anymore.

When I try to apply the three other patches I always get something like in the attached jpeg....File not Found....even if i mix the order, nothing happens.

Behind the three mandatory links I can find zips to download which are full of plugins. Would it be a possibility to download the zip of one of the three links (which one), copy it into my eclipse folder and the apply your attached patch afterwards ?

Option c)

To dump all the more!

Option a)

I think I would get that working....but what do you think how long I will have to weit for the next build ? This will be a so called stable build, right ?

Attachment: patch-problem.JPG
(Size: 156.52KB, Downloaded 476 times)

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